Author: XINDA

The supporting equipment and systems of steam boilers are the key to ensuring their safe, stable and efficient operation. According to their functions, they can be classified into three major categories: main supporting equipment, safety protection equipment and auxiliary system equipment.

Main Supporting Equipment: This type of equipment directly participates in the generation and transportation of steam and is a core accessory for the operation of boilers.
1. Water supply equipment
Feed water pump: It is responsible for transporting the treated water to the boiler drum and is the core equipment for maintaining the water level of the boiler. Common types include electric feed water pumps and steam-driven feed water pumps.
Water treatment equipment: including water softeners, reverse osmosis devices, etc. Steam boilers have extremely high requirements for water quality. Calcium and magnesium ions in untreated water can form scale, corrode the boiler body and reduce thermal efficiency. Deaerators can remove oxygen from the water and prevent oxidation and corrosion inside the boiler.
2. Combustion equipment
The supporting equipment varies depending on the type of fuel
Coal-fired boilers: Equipped with coal feeders, ash removers, coal mills (for pulverized coal furnaces), grates, etc., they are responsible for fuel transportation, grinding, combustion and ash and slag discharge.
Oil/gas boilers: Equipped with burners, fuel pumps/storage tanks/gas pipelines, etc., to ensure stable fuel supply and complete combustion.
Biomass boiler: equipped with conveyors, silos, etc.
3. Steam conveying equipment
Steam distribution cylinder: It distributes the steam generated by the boiler to different steam-using pipelines, and at the same time serves to stabilize pressure and separate steam and water.
Steam pipes and valves: including globe valves, gate valves, check valves, etc., are used for the transportation, regulation and shut-off of steam.

Safety Protection Equipment: This type of equipment is an essential device to prevent accidents such as overpressure, over-temperature, and water shortage in boilers, and must comply with national safety regulations for special equipment.
Pressure safety device
Safety valve: It automatically opens to relieve pressure when the boiler pressure exceeds the rated value. It is the most crucial safety component of the boiler and needs to be calibrated regularly.
Pressure gauge: It can display the pressure values of the boiler drum, steam distribution cylinder and other parts in real time, facilitating the monitoring by operators.
Pressure controller: Automatically controls the start and stop of the combustion system through pressure signals to prevent overpressure operation.
Water level safety device
Water level gauge: It visually displays the water level height in the boiler drum. Common types include glass plate water level gauge and magnetic flap water level gauge.
Water level alarm: When the water level is too high (full water) or too low (lack of water), it automatically issues an audible and visual alarm signal.
High and low water level interlock protection device: When the water level is abnormal, it automatically cuts off the fuel supply and combustion system, forcing the furnace to shut down.

Auxiliary System Equipment: This type of equipment is used to enhance the operational efficiency of boilers, reduce energy consumption and decrease pollutant emissions.
Flue gas treatment equipment
Dust collectors: Remove dust from flue gas. Common types include bag filters, electrostatic precipitators, and cyclone filters.
Desulfurization and denitrification equipment: For coal-fired and oil-fired boilers, it reduces the content of sulfur dioxide and nitrogen oxides in flue gas to meet environmental protection emission standards.
Induced draft fan and blower: The induced draft fan is responsible for discharging the flue gas after combustion, while the blower supplies combustion-supporting air to the furnace. The two work together to maintain a stable negative pressure in the furnace.
Waste heat recovery equipment
Economizer: Utilizing the residual heat of flue gas to heat the boiler feed water, it reduces the flue gas temperature and enhances thermal efficiency.
Air preheater: Utilizing the residual heat of flue gas to heat the combustion-supporting air and improve combustion conditions.
Waste heat boiler: Some industrial scenarios are equipped with waste heat boilers to recover the waste heat from other equipment and generate steam.
Control system
PLC control cabinet: It automatically controls and remotely monitors parameters such as water level, pressure, temperature and combustion of the boiler, achieving intelligent operation.

Determining the rated steam pressure of a gas-fired steam boiler can be summed up in one sentence: The steam pressure must meet the maximum working pressure required by the equipment that uses steam. Here I’ll give you a simple, practical and pitch-free judgment method.

1.The most crucial basis: How much pressure does your steam-using equipment require?
Steam pressure is neither the higher the better nor the lower the better; it should match your equipment.
You just need to check the nameplate of the equipment you use steam. It usually states: · Working pressure (MPa); Maximum allowable pressure (MPa).
The rated steam pressure of the boiler must be greater than or equal to the maximum working pressure of the equipment.
For example: If you have a sterilizer that requires 0.7MPa, then the boiler should at least be selected at 0.7MPa.

2. If the pressure of the equipment is unknown, it can also be judged by empirical values
The following are typical stress requirements in common industries:
· Food processing (steaming, double-layer pot) : 0.4-0.7MPa
· Washing and ironing industry: 0.4-0.6MPa
· Pharmaceutical industry: 0.6-1.0MPa
· Chemical industry: 0.6-1.25MPa
· Heating: Atmospheric pressure boilers are generally employed.(0mpa)
If you don’t know the pressure of the equipment, you can tell me your industry and I can directly recommend a suitable pressure for you.

To ensure the stable operation of steam boilers in the papermaking industry, it is necessary to establish a full-process management system from four dimensions: preparation before operation, control during operation, regular maintenance and upkeep, and formulation of emergency plans. Considering the characteristics of continuous production and large fluctuations in steam demand in the papermaking industry, the specific measures are as follows
I. Before operation: Make basic preparations and calibrate parameters
Precisely match the steam load
The steam consumption in the processes of pulping, cooking, papermaking and drying in the papermaking production line fluctuates greatly. It is necessary to calculate the maximum instantaneous steam consumption and the average steam consumption in advance, and configure steam accumulators to balance peak and off-peak loads, so as to avoid frequent start-up and shutdown of the boiler or overloading operation.
At the same time, ensure that the rated evaporation capacity of the boiler reserves a margin of 10% to 20% to meet the temporary production increase demands of the production line.
Strict control over fuel and water quality
Fuel management: Paper mills commonly use biomass fuels such as black liquor, tree bark, and wood chips. It is necessary to ensure the stability of the fuel’s calorific value and that the moisture content meets the standard (the moisture content of biomass fuel is recommended to be ≤25%) to avoid unstable combustion in the furnace due to fluctuations in fuel calorific value. Black liquor needs to be filtered to remove impurities to prevent clogging of nozzles or grate.
Water quality management: Papermaking boilers have extremely high requirements for the quality of feed water. They need to be equipped with water softening and deaeration devices, strictly controlling the hardness of the feed water to be ≤0.03 mmol/L and the dissolved oxygen to be ≤0.05 mg/L, to prevent scaling and corrosion on the boiler’s heating surfaces, which may affect heat transfer efficiency and equipment lifespan.
Pre-inspection of equipment and systems
Before starting, it is necessary to check whether the safety accessories such as the boiler body, safety valve, pressure gauge and water level gauge are sensitive and reliable. Check the flow conditions of waste heat recovery devices such as economizers and air preheaters; Confirm the valve opening and closing status of the steam network to avoid “blind pipes” or steam leakage.
Ii. During operation: Strengthen real-time monitoring and load regulation
Real-time monitoring of core parameters
Establish a boiler operation monitoring system to track key parameters such as steam pressure, steam temperature, water level, furnace negative pressure, and flue gas temperature in real time. Set parameter fluctuation thresholds (such as steam pressure fluctuation ≤±0.05 MPa), and immediately alarm once the limit is exceeded.
Key focus:
Water level control: A three-stroke water level regulation system is adopted to prevent full water or water shortage accidents.
Combustion control: Automatically adjust the fuel supply volume and the volume of forced and induced draft air according to the load changes to maintain the optimal air-coal ratio, ensure complete combustion in the furnace, and reduce the heat loss of flue gas.
Load regulation suitable for papermaking production lines
The steam consumption of the papermaking production line varies with the pulping batch and the papermaking speed. The boiler needs to have a wide load adjustment capacity (stable operation at 30% to 110% of the rated load).
Intelligent interlocking control can be adopted: The boiler control system can be connected to the DCS system of the papermaking production line. Based on parameters at the steam-consuming end such as the temperature of the drying cylinder and the pressure of the steamer, the combustion conditions of the boiler can be automatically adjusted to achieve precise matching of supply and demand.
Reduce steam loss and recycle it
Regularly inspect the steam pipeline network, promptly repair leakage points, and insulate the pipelines to reduce heat dissipation losses.
The condensate water discharged from the drying cylinder is recovered in a closed manner, and the high-temperature condensate water is directly used as boiler feed water. This not only reduces the cost of soft water preparation but also utilizes the residual heat of the condensate water to increase the boiler feed water temperature and lower fuel consumption.
Iii. Regular Maintenance: Establish a standardized maintenance system
Cleaning and inspection of the heating surface
Descaling: Depending on the water quality, chemical cleaning or mechanical descaling should be carried out on the boiler heating surface every 3 to 6 months to prevent the decline in heat transfer efficiency and local overheating damage caused by scaling.
Ash cleaning: Regularly clean the accumulated ash in the economizer, air preheater and bag filter to ensure smooth flow and reduce flue gas resistance.
Calibration and maintenance of safety accessories and auxiliary equipment
Safety valve: Manual discharge tests are conducted every quarter, and it is sent to a professional institution for calibration every year to ensure the accuracy of the take-off pressure.
Pressure gauges and water level gauges: Calibrated once a month to ensure accurate indication.
For auxiliary machines such as forced and induced draft fans and feed water pumps: Regularly check the bearing temperature and lubricating oil level, and replace worn parts in a timely manner to prevent boiler shutdown due to auxiliary machine failure.
Special maintenance for fuels dedicated to papermaking
If black liquor or high-ash biomass fuel is used, the frequency of cleaning the grate and nozzles should be increased to prevent coking and blockage. Regularly inspect the pipelines and valves of the alkali recovery system to prevent corrosion and leakage.
Iv. Emergency Management: Develop contingency plans and conduct regular drills
Establish emergency response plans for common faults
In response to common faults in papermaking boilers such as sudden drops in steam pressure, coking inside the furnace, and interruption of water supply, detailed emergency procedures have been formulated, clearly defining the handling steps for operators, for example:
When the steam pressure drops sharply, priority should be given to ensuring the steam supply for the papermaking and drying process, and the load of the pulping process should be temporarily reduced.
When coking occurs in the furnace, the combustion conditions should be adjusted in a timely manner, and mechanical decoking or manual cleaning should be adopted after the furnace is shut down.
Regularly carry out emergency drills
Organize a boiler malfunction emergency drill every six months to test the handling capabilities of the operators and at the same time improve the loopholes in the contingency plan.
Reserve key spare parts
Stock up on key spare parts such as safety valves, pressure gauges, nozzles and pump impellers in advance to avoid prolonged downtime due to shortage of spare parts.

The core function of a hot water boiler is to provide hot water and meet various heating demands based on the heat transfer of hot water. The common application scenarios mainly fall into the following categories:
1. Civil heating
This is the most widespread use of hot water boilers. The boiler heats water to a certain temperature (usually the supply water temperature is 80-95 ℃ and the return water temperature is 60-70 ℃), and then delivers it through pipes to the terminal equipment such as radiator, floor heating coil or fan coil in the room. The heat of the hot water is used to raise the indoor temperature, which is suitable for winter heating in residential buildings, office buildings, shopping malls, schools and other places.
2. Domestic hot water supply
Some hot water boilers can also be used or are specifically designed to supply domestic hot water, such as meeting the needs of bathing, kitchen water, cleaning water, etc. In such scenarios, the temperature of the hot water heated by the boiler is generally controlled at 40 to 60 degrees Celsius and is supplied to the water usage points within the building either through a hot water storage tank or by direct delivery.
3. Industrial production heating
In the industrial field, hot water boilers can serve as heat sources to provide heating support for production processes, for example:
Constant temperature heating for dyeing and drying processes in textile factories;
It is used in food processing plants for raw material preheating, steaming, sterilization and other processes;
It is used for temperature control and heating of reaction vessels in the chemical and pharmaceutical industries, or for insulation and moisture retention in workshops.
It should be noted that the water in a hot water boiler is generally in a closed or semi-closed circulation. Compared with steam boilers, it has a lower operating pressure, higher safety, and less heat loss.

Wineries choose steam boilers mainly because steam has advantages such as precise temperature control, uniform heating, easy adjustment, cleanliness and hygiene, and safety and reliability in the wine production process. The following are the specific reasons:
1. Fermentation temperature control
Wine fermentation requires strict temperature control (red wine is generally 25-30°C, and white wine is 15-20°C). Steam passing through the heat exchanger can stably and precisely regulate the temperature of the fermentation tank, avoiding local overheating or temperature fluctuations.
2. Sterilization and hygiene requirements
Steam is a natural bactericide and can be used to sterilize equipment, pipelines and fermentation tanks, ensuring that wine is not contaminated by miscellaneous bacteria.
3. Uniform heating
Steam heating is carried out through a heat exchanger and does not directly contact the wine body, avoiding changes in wine quality caused by local high temperatures. The heating process is more gentle and uniform.
Easy to adjust and automate
The steam pressure and flow rate can be precisely controlled, facilitating linkage with an automated system to achieve automatic adjustment of fermentation temperature and sterilization temperature.
4. Safe and reliable
The steam boiler technology is mature, operates stably, and the steam itself does not burn or explode, making it safe to use.
5. High energy efficiency
Steam boilers have high thermal efficiency and can quickly meet the heating demands during the brewing process, reducing energy consumption.
6. Versatility
Steam is not only used for temperature control and sterilization during fermentation, but also for multiple processes such as distillation of grape skins and residue, hot water supply, and heating in workshops.

Steam boilers play a core and irreplaceable role in the production process of tomato sauce factories. Their significance runs through the entire process from raw material pretreatment to finished product packaging, directly affecting product quality, production efficiency and energy consumption costs.

Steam can be used to heat the cleaning water, enhancing the cleaning effect and removing pesticide residues and soil impurities on the surface of tomatoes. Meanwhile, tomatoes that have been heated are more prone to breakage, which can enhance the efficiency and yield of subsequent pulping. Tomatoes contain pectinase, polyphenol oxidase and other enzymes, which can cause tomato sauce to brown, reduce viscosity and affect quality. Rapid preheating and enzyme inactivation of crushed tomatoes through steam heating can effectively inhibit the activity of enzymes, maintaining the color and taste of tomato sauce.

The high-temperature steam produced by the steam boiler is the main heating medium for the evaporator. Through heat exchange, the heat of the steam is transferred to the tomato pulp, causing the water to vaporize and separate rapidly, achieving concentration. The stability of steam pressure and temperature directly determines the concentration efficiency and product uniformity. A stable steam supply can prevent over-concentration or under-concentration, ensuring that the concentration and viscosity of each batch of tomato sauce are consistent.

Tomato sauce is an acidic food, but it still needs to be strictly sterilized to kill pathogenic and spoilage bacteria and extend its shelf life. High-temperature sterilization process is usually adopted. Steam is used to heat the tomato sauce to the specified sterilization temperature (such as 90-100℃) and maintain it for a certain period of time to thoroughly kill microorganisms. Compared with other heating methods, steam sterilization has uniform temperature and strong controllability. It can ensure the sterilization effect while reducing the damage to the nutritional components and flavor of tomato sauce.

In conclusion, the steam boiler is the “power heart” of a tomato sauce factory. Its performance and operational stability directly affect product quality, production continuity, and the economic benefits of the enterprise.

Due to the high requirements for temperature control accuracy in dessert production and its sensitivity to hygiene conditions, the following points should be noted when selecting the type:
Give priority to gas-fired steam boilers
High thermal efficiency: The thermal efficiency of gas boilers can reach over 95%, making them more energy-efficient compared to coal-fired boilers.
Environmental protection: Clean combustion, no dust or waste residue, meeting the environmental protection and hygiene requirements of food factories.
Quick start and stop: Suitable for production with large load fluctuations (such as order-based production).
Electric heating steam generator (small/laboratory use) :
If it is a small workshop or laboratory research and development, electric heating boilers are very popular due to their small size, no need for inspection (for some models), and no pollution.

Temperature control accuracy
The cooking of desserts is highly sensitive to temperature (a difference of 1-2 degrees may result in a completely different taste). It is recommended to choose a boiler equipped with a PLC fully automatic control system, which can precisely adjust the steam pressure and thus accurately control the temperature.

Food-grade water quality requirements
Boilers must be equipped with soft water devices. If the steam contains rust or impurities, it will seriously affect the color and taste of desserts (for example, causing jam to discolor).

WNS series gas-fired steam boilers: Horizontal internal combustion three-pass fire-tube boilers, are currently the most mainstream choice for food factories. It features a compact structure, smooth operation and low noise.
Electric steam boiler: It has a small water volume and an extremely fast pressure rise speed (steam can be produced within a few minutes), making it highly suitable for dessert production lines with intermittent steam demands.

Steam generators are one of the core thermal energy devices in the textile printing and dyeing industry. The stable steam they generate can meet the key demands of heating, humidification, and setting in various printing and dyeing processes, significantly enhancing production efficiency and product quality.
The scouring, bleaching and dyeing of textile fabrics all require high-temperature environments to ensure that chemical reactions proceed fully. The saturated steam provided by the steam generator can precisely heat the solutions in the dyeing VAT and scouring tank to the required process temperature (usually 90-130℃), while ensuring uniform and stable temperature, avoiding problems such as uneven dyeing and local color fading of the fabric. Compared with traditional boilers, steam generators heat up quickly, control temperature precisely, and can also reduce the discharge of wastewater pollutants.
After the fabric is printed, it needs to be fixed at high temperature to prevent the pattern from peeling off or fading. The steam generated by the steam generator can be introduced into the steamer to create a high-temperature and high-humidity color-fixing environment for the fabric, allowing the dye to fully penetrate into the interior of the fibers and enhancing the firmness and vividness of the prints. The small steam generator can also be adapted to small-batch printing production lines, offering higher flexibility.
If the air in the textile printing and dyeing workshop is too dry, the fabric is prone to static electricity and pilling, which will affect production and quality. The low-pressure steam produced by the steam generator can be directly introduced into the workshop for humidification, maintaining an appropriate humidity level (generally 60% – 70%), reducing static interference, and enhancing the smoothness of fabric processing.

The use of steam boilers for heating in hotels is a relatively traditional and mature solution, especially suitable for medium and large-sized hotels with multiple demands such as hot water supply and kitchen steam. Its core advantage lies in stable heat output and the ability to achieve multi-purpose energy supply.
The steam boiler heats the water in the furnace by burning fuel (such as natural gas, diesel, biomass, etc.) to vaporize it into high-temperature steam, and then provides heating for the hotel through the following two methods:
Indirect heating: Steam is delivered to the heat exchanger to heat the cold water in the circulating water system. The hot water is then dissipated through the hotel’s radiator, floor heating coil or fan coil to meet the heating needs of guest rooms, lobbies, corridors and other areas.
2. Direct heating: Steam is directly introduced into the heating coil of the air conditioning unit to heat the supply air flow. This is suitable for some Spaces with high requirements for heating speed, but attention should be paid to the recovery of condensate water and prevention of steam leakage.
Meanwhile, the steam generated by the steam boiler can also be used for heating domestic hot water in the hotel, steam for kitchen steam cabinets, and steam for ironing equipment in the laundry room, etc., achieving “one machine with multiple uses” and improving energy utilization efficiency.

When a beverage factory selects an appropriate steam boiler, it needs to make a comprehensive judgment based on four core dimensions: production capacity demand, process characteristics, safety compliance, and cost control, in combination with its own production scale and product types (such as fruit juice, dairy products, carbonated beverages, etc.). The specific steps and key points are as follows:

1. Clarify core demands: Match production capacity with process parameters
Calculate the steam demand (in tonnage)
This is the primary basis for selection. It is necessary to calculate the steam consumption of all steam-using links, including sterilization, extraction, concentration, packaging and drying, etc.
For small and medium-sized juice factories with an average daily steam consumption of approximately 1 to 5 tons, boilers with a rated evaporation capacity of 5 tons per hour can be selected. Large-scale dairy factories need to select large-capacity boilers with a capacity of 5 to 10 tons per hour based on requirements such as sterilization and insulation of fermentation tanks.
Determine the steam quality (pressure, temperature)
The processes in beverage factories mostly require saturated steam, with pressures typically ranging from 0.7 to 1.6MPa (corresponding to temperatures of 170 to 204℃).
Pasteurization and raw material extraction: 0.7 to 1.0MPa is sufficient to meet the requirements.
Ultra-high temperature instantaneous sterilization (UHT) and vacuum concentration: High-pressure steam at 1.2 to 1.6MPa is required to ensure rapid heating and efficient dehydration.
CIP cleaning: The steam pressure must match the design parameters of the cleaning system to prevent excessive pressure from damaging the pipelines.

2.Select the type of boiler fuel: Balance cost and environmental protection
The type of fuel directly affects operating costs and the difficulty of meeting environmental protection standards. It is necessary to comprehensively select suitable fuels (such as biomass, natural gas, diesel, electricity, etc.) in combination with local energy policies and fuel prices.

3. Consider safety and compliance: Meet the requirements for food production
Safety performance priority
Choose products from regular manufacturers with a national special equipment manufacturing license. Boilers should be equipped with safety valves, pressure gauges, water level gauges, and overpressure/low water protection devices to prevent safety accidents such as explosions and dry burning.
Beverage factories are classified as food production sites. The sealing performance and leak-proof design of boilers must meet standards to prevent impurities carried by steam from contaminating the workshop environment.
Choose boilers that meet national environmental protection emission standards.
Steam pipes that come into indirect contact with food raw materials should be made of food-grade stainless steel to prevent the release of heavy metals.

4. Optimize operating costs: Focus on thermal efficiency and the level of automation
Boilers with fully automatic control systems can achieve automatic water supply, automatic ignition, automatic pressure regulation, and automatic fault alarm, reducing manual operation steps and lowering operation and maintenance costs.
Supporting waste heat recovery system: Utilizing the waste heat from the boiler flue gas to preheat the feed water and heat the workshop for heating, further reducing energy consumption and enhancing the thermal efficiency of the boiler.

5. Other key considerations
Installation and floor space
Small and medium-sized beverage factories can choose horizontal quick-assembly boilers, which have a compact structure and a short installation period (1 to 2 months). Large boilers need to plan the layout of the factory building in advance, reserving space for fuel storage, ventilation and sewage discharge.
After-sales service
Choose a manufacturer that offers good after-sales service and timely communication.

The core logic for beverage factories to select steam boilers is: “process matching + optimal cost + safety and compliance”. Small and medium-sized factories should give priority to steam generators or steam boilers with a capacity of 5 tons or less. Large factories can adopt a parallel connection of multiple boilers to balance stability and flexibility, or choose large steam boilers (over 5 tons). At the same time, it is essential to attach great importance to the quality of steam and environmental protection requirements to avoid affecting product quality and production compliance due to improper equipment selection.