A modularly assembled small steam boiler

Abstract

The utility model provides a modular assembly's small -size steam boiler, including the front smoke box, the front smoke box and rear smoke box are fixedly installed in modular boiler shell module's kettle shell both ends, the third return flue pipe that sets up in the kettle shell outer cover is linked with the front smoke box and rear smoke box respectively, the front smoke box is linked with the return combustion chamber that sets up in the kettle shell outer cover through the second return flue pipe, the fire hole that return combustion chamber sets up is sealed and sealed by the plugging cover installed on rear smoke box, and the smoke outlet is provided on the rear smoke box top, the furnace is linked with return combustion chamber and the front smoke box respectively with the installation setting in the front smoke box, and the burner installed on the front smoke box extends into one end of furnace, the utility model discloses the pressure regulating mechanism of modular boiler shell module, guarantees the safe and stable operation and steam supply continuity, provides steam storage redundancy, enhances system reliability, the standard interface design promotes the adaptability, is energy -conserving and environment -friendly still.

Description

Technical Field

[0001] This utility model belongs to the field of steam boiler technology, and in particular relates to a modularly assembled small steam boiler. Background Technology

[0002] Small steam boilers are widely used in industrial production and commercial services. However, existing small steam boilers have revealed many problems in actual operation. On the one hand, most traditional small steam boilers lack effective pressure regulation and stabilization mechanisms. When steam production and consumption fluctuate, the internal pressure of the boiler is difficult to maintain within a safe and efficient operating range. For example, in some food processing enterprises, the instantaneous demand for steam changes greatly during production. Traditional boilers, unable to adjust the pressure in time, often experience overpressure alarms or even safety valve trips to release steam, resulting not only in energy waste but also potentially affecting the boiler's service life and operational safety due to frequent pressure fluctuations. On the other hand, existing small steam boilers generally lack redundant design. Once the boiler itself malfunctions, such as a damaged furnace or blocked flue pipes, the entire steam supply system will be paralyzed, severely impacting production continuity. This problem is particularly prominent in industries such as chemicals and pharmaceuticals, where the stability of steam supply is extremely critical. A single interruption in steam supply can lead to the scrapping of an entire batch of products, resulting in huge economic losses. Furthermore, traditional small steam boilers struggle to cope flexibly with complex operating conditions. Different seasons and different production tasks have different requirements for steam parameters, and traditional boilers often cannot be easily adjusted, which limits their application in diverse scenarios.

[0003] Therefore, it is essential to invent a modularly assembled small steam boiler. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a modularly assembled small steam boiler, including a front smoke box, a rear smoke box, a modular boiler shell module, a third pass smoke pipe, a second pass smoke pipe, a combustion chamber, a viewing hole, a sealing cover, a flue gas outlet, a furnace shell, and a burner. The front smoke box and the rear smoke box are respectively fixedly installed at both ends of the boiler drum shell of the modular boiler shell module. The third pass smoke pipe provided inside the boiler drum shell is connected to the front smoke box and the rear smoke box respectively. The front smoke box is connected to the combustion chamber provided inside the boiler drum shell through the second pass smoke pipe. The viewing hole provided in the combustion chamber is sealed by the sealing cover installed on the rear smoke box. A flue gas outlet is provided above the rear smoke box. The furnace shell installed inside the front smoke box is connected to the combustion chamber and the front smoke box respectively. The burner installed on the front smoke box extends into one end of the furnace shell.

[0005] Preferably, the modular boiler shell module includes a boiler drum shell, a mounting base, a low-pressure boiler tank, a high-pressure boiler tank, connecting pipes, pressure gauges, and a main steam pipe. The main steam pipe is located on the top of the boiler drum shell, and a water injection pump assembly is installed on one side of it. The low-pressure boiler tank and the high-pressure boiler tank are respectively fixedly installed on the side of the boiler drum shell through the mounting base. The boiler drum shell, the low-pressure boiler tank, and the high-pressure boiler tank are interconnected through connecting pipes, and pressure gauges are installed on all three.

[0006] Preferably, solenoid valves are installed on the connecting pipelines that connect the boiler drum shell, the low-pressure boiler tank, and the high-pressure boiler tank, and the solenoid valves and pressure gauges are all connected to the controller signal.

[0007] Preferably, the outer shell of the boiler drum is connected to the low-pressure boiler tank and the high-pressure boiler tank respectively through connecting pipes. The low-pressure boiler tank and the high-pressure boiler tank are connected through connecting pipes. All three are coated with heat-insulating coating. The connecting pipes connecting the three are designed with standard interfaces.

[0008] Preferably, excess air inside the boiler drum shell can be injected into the low-pressure boiler tank through a connecting pipe, and high-pressure steam generated inside the boiler drum shell can be injected into the high-pressure boiler tank through a connecting pipe.

[0009] Preferably, excess high-pressure steam inside the high-pressure boiler tank can be injected into the low-pressure boiler tank through a connecting pipeline, and a pressure relief valve is installed inside the low-pressure boiler tank.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This invention establishes a stable pressure regulation mechanism through a modular boiler shell module comprising a low-pressure boiler tank, a high-pressure boiler tank, and connected pipelines and solenoid valves, in conjunction with pressure gauges and a controller. When the steam pressure inside the boiler drum shell increases, the solenoid valve in the connecting pipeline automatically opens, discharging excess steam into the high-pressure boiler tank, effectively preventing overpressure operation of the boiler drum shell and ensuring the safety and stability of boiler operation. When the pressure inside the boiler drum shell decreases, the steam in the high-pressure boiler tank can flow back to replenish it, maintaining system pressure balance, ensuring continuous steam supply, and greatly improving the operational stability of the equipment under different operating conditions.

[0012] The design of the low-pressure and high-pressure boiler tanks in this invention not only achieves pressure regulation but also provides redundant space for steam storage. In the event of a temporary malfunction in the boiler drum shell that prevents steam generation, the steam stored in the high-pressure and low-pressure boiler tanks can continue to be supplied, preventing steam supply interruptions due to unforeseen circumstances, reducing the impact on production, and enhancing the reliability and fault tolerance of the entire steam supply system.

[0013] This utility model employs a standardized interface design for the connecting pipeline between the boiler drum shell, the low-pressure boiler tank, and the high-pressure boiler tank. This allows for flexible adjustment of the combination and operating parameters of each module according to actual steam demand in different application scenarios. For example, the number of modules can be increased during peak steam demand seasons, while the number of operating modules can be reduced during off-peak seasons, thereby reducing energy consumption and improving the equipment's adaptability to complex operating conditions.

[0014] This invention reduces unnecessary steam emissions, improves energy efficiency, and lowers operating costs through reasonable pressure regulation and steam storage and utilization. Simultaneously, the insulating coating applied to the surface of each tank effectively reduces heat loss, further enhancing energy utilization and meeting environmental protection requirements for energy conservation and emission reduction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a half-sectional structural diagram of the present invention.

[0017] Figure 3 This is a structural schematic diagram of the modular boiler shell module of this utility model.

[0018] Figure 4 This is another perspective structural diagram of the modular boiler shell module of this utility model.

[0019] In the picture:

[0020] 1. Front smoke box; 2. Rear smoke box; 3. Modular boiler shell module; 31. Boiler drum shell; 32. Mounting base; 33. Low-pressure boiler tank; 34. High-pressure boiler tank; 35. Connecting pipeline; 36. Pressure gauge; 37. Main steam pipe; 4. Third pass smoke pipe; 5. Second pass smoke pipe; 6. Combustion chamber; 7. Observation hole; 8. Sealing cover; 9. Exhaust pipe outlet; 10. Furnace shell; 11. Burner. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0023] As attached Figure 1 To be continued Figure 4 As shown:

[0024] This utility model provides a modularly assembled small steam boiler, including a front smoke box 1, a rear smoke box 2, a modular boiler shell module 3, a third return smoke pipe 4, a second return smoke pipe 5, a combustion chamber 6, an observation hole 7, a sealing cover 8, an exhaust pipe 9, a furnace liner 10, and a burner 11. The front smoke box 1 and the rear smoke box 2 are respectively fixedly installed at both ends of the boiler drum shell 31 of the modular boiler shell module 3. The third return smoke pipe 4, which is provided inside the boiler drum shell 31, is connected to the front smoke box 10. The front smoke box 1 and the rear smoke box 2 are connected. The front smoke box 1 is connected to the combustion chamber 6 inside the boiler drum shell 31 through the second return smoke pipe 5. The observation hole 7 in the combustion chamber 6 is sealed by the sealing cover 8 installed on the rear smoke box 2. The exhaust pipe 9 is provided above the rear smoke box 2. The furnace liner 10 installed inside the front smoke box 1 is connected to the combustion chamber 6 and the front smoke box 1 respectively. The burner 11 installed on the front smoke box 1 extends into one end of the furnace liner 10.

[0025] Furthermore, the modular boiler shell module 3 is the core load-bearing and connecting component of the entire boiler system. It includes key components such as the boiler drum shell 31, mounting base 32, low-pressure boiler tank 33, high-pressure boiler tank 34, connecting pipeline 35, pressure gauge 36, and main steam pipe 37. The boiler drum shell 31, as the main container, is made of high-strength, high-temperature resistant boiler-specific steel. The main steam pipe 37, made of seamless steel pipe, is fixedly installed on its top via a flange connection and is used to transport qualified steam generated by the system to external steam-using equipment. A water injection pump assembly is installed on one side of the boiler drum shell 31 via a bolted bracket structure. This pump assembly is connected to the interior of the boiler drum shell 31 and can automatically or manually replenish water into the boiler drum shell 31 based on system water level monitoring data. On the side of the boiler drum shell 31, a low-pressure boiler tank 33 and a high-pressure boiler tank 34 are fixedly mounted on multiple symmetrically distributed mounting seats 32. The mounting seats 32 are made of cast iron and are firmly connected to the boiler drum shell 31 and the two boiler tanks with bolts to ensure stable connection of each component during operation. The boiler drum shell 31, the low-pressure boiler tank 33, and the high-pressure boiler tank 34 are interconnected by multiple sets of connecting pipes 35. The connecting pipes 35 are made of high-temperature and high-pressure resistant alloy steel pipes and are equipped with reinforcing ribs to enhance structural strength. At the same time, pressure gauges 36 are installed at the top of the boiler drum shell 31, the low-pressure boiler tank 33, and the high-pressure boiler tank 34. The pressure gauges 36 are pointer-type pressure gauges that can monitor the pressure inside each container in real time, allowing operators to easily monitor the system's operating status.

[0026] Furthermore, to achieve precise control of the medium flow between the containers, solenoid valves are installed on each connecting pipe 35 connecting the boiler drum shell 31, the low-pressure boiler tank 33, and the high-pressure boiler tank 34. These solenoid valves are made of high-temperature and high-pressure resistant stainless steel and feature fast response and good sealing performance. These solenoid valves and all pressure gauges 36 are connected to the controller via shielded cables. The pressure gauges 36 convert the real-time monitored internal pressure signals of each container into electrical signals and transmit them to the controller. The controller then sends on / off control signals to the corresponding solenoid valves according to preset pressure parameters and control logic, thereby achieving automatic control of the on / off state of each connecting pipe 35 and ensuring that the system pressure remains within a safe and stable operating range.

[0027] Furthermore, from the perspective of the connection structure, the boiler drum shell 31 is connected to the low-pressure boiler tank 33 and the high-pressure boiler tank 34 respectively through two sets of independent connecting pipes 35. Simultaneously, the low-pressure boiler tank 33 and the high-pressure boiler tank 34 are also directly connected through a set of connecting pipes 35, forming a complete circulating connection system. To reduce system heat loss and improve energy utilization efficiency, the outer surfaces of the boiler drum shell 31, the low-pressure boiler tank 33, and the high-pressure boiler tank 34 are uniformly coated with a 5-8mm thick high-temperature insulation coating, which has excellent heat insulation and high-temperature resistance properties. In addition, all connecting pipes 35 used for connection between the three adopt a standardized interface design, with uniform flange connections at the interfaces. This not only facilitates the installation, disassembly, maintenance, and replacement of components but also ensures good interchangeability of components produced in different batches, reducing system maintenance costs and time.

[0028] Furthermore, during system operation, excess air generated inside the boiler drum shell 31 due to water replenishment or other reasons can be smoothly injected into the low-pressure boiler tank 33 through a specific connecting pipe 35 under the action of pressure difference. This air can be temporarily stored in the low-pressure boiler tank 33 or discharged from the system through subsequent exhaust operations, avoiding the accumulation of air inside the boiler drum shell 31 that would affect the boiler's thermal efficiency and operational safety. Meanwhile, the high-pressure steam generated inside the boiler drum shell 31 through heating, when reaching a certain pressure value, can be injected into the high-pressure boiler tank 34 through the corresponding connecting pipe 35 for further storage or superheating treatment, in order to meet the steam parameter requirements of different steam-using equipment.

[0029] Furthermore, when the steam pressure inside the high-pressure boiler tank 34 exceeds its set safe pressure range, the excess high-pressure steam can be injected into the low-pressure boiler tank 33 through a dedicated connecting pipe 35 to achieve pressure balance and regulation, preventing safety accidents caused by excessive pressure in the high-pressure boiler tank 34. Simultaneously, a pressure relief valve is installed at the top of the low-pressure boiler tank 33. This valve employs a spring-loaded structure, featuring accurate pressure setting and sensitive operation. When the internal pressure of the low-pressure boiler tank 33 exceeds its safe limit, the pressure relief valve automatically opens, releasing excess steam or gas to the outside, ensuring that the low-pressure boiler tank 33 always operates within the safe pressure range. The pressure relief valve is existing technology and will not be described in detail further.

[0030] Furthermore, a closed-loop control relationship is formed between the controller, pressure gauges 36, and solenoid valves. Each pressure gauge 36 has a unique address code and is connected to the controller's input interface via a signal cable, transmitting the monitored pressure data of the corresponding container (boiler drum shell 31, low-pressure boiler tank 33, and high-pressure boiler tank 34) to the controller's central processing unit in real time. The controller has preset parameters such as the normal operating pressure range and upper and lower pressure thresholds for each container. When the central processing unit receives the pressure data transmitted by the pressure gauges 36, it compares and analyzes it with the preset parameters. If the pressure of a container exceeds or falls below the set range, the controller will determine the solenoid valve that needs to be activated according to the preset control logic (e.g., when the pressure of the boiler drum shell 31 is too high, it controls the solenoid valve connecting the boiler drum shell 31 and the high-pressure boiler tank 34 to open, introducing some steam into the high-pressure boiler tank 34), and sends a corresponding electrical signal (usually a DC 24V signal) to the solenoid valve through the output interface to control the opening or closing of the solenoid valve. At the same time, the controller will also monitor the working status of pressure gauge 36 and solenoid valve. If an abnormal signal or equipment failure occurs, it will promptly issue an alarm signal to remind the operator to handle the situation, thereby ensuring the safe, stable and efficient operation of the entire boiler system.

[0031] The working principle is as follows: First, the burner 11 starts working, injects fuel into the furnace 10 and ignites it, and the generated high-temperature flue gas enters the furnace 10.

[0032] Secondly, the high-temperature flue gas first flows through the furnace shell 10 to the combustion chamber 6, completing the first pass heat exchange; then it enters the front smoke box 1 through the second pass smoke pipe 5, completing the second pass heat exchange; then it enters the rear smoke box 2 through the third pass smoke pipe 4, completing the third pass heat exchange, and finally it is discharged through the exhaust pipe 9.

[0033] Furthermore, during the flue gas flow, the water inside the boiler drum shell 31 absorbs heat from the flue gas, gradually heating up and generating steam.

[0034] Then, the pressure gauge 36 monitors the pressure in each container in real time and transmits the signal to the controller. According to the preset parameters, the controller controls the solenoid valve switch on the connecting pipeline 35 to adjust the steam flow between the boiler drum shell 31, the low-pressure boiler tank 33, and the high-pressure boiler tank 34. For example, excess air in the boiler drum shell 31 is introduced into the low-pressure boiler tank 33, high-pressure steam is introduced into the high-pressure boiler tank 34, or steam is introduced into the low-pressure boiler tank 33 when the pressure in the high-pressure boiler tank 34 is too high.

[0035] Finally, the generated qualified steam is transported to external steam-using equipment through the main steam pipe 37; if the pressure of the low-pressure boiler tank 33 exceeds the safety limit, the pressure relief valve on its top will automatically open to release pressure, ensuring the safe operation of the system.

[0036] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A modularly assembled small steam boiler, characterized in that, The boiler includes a front smoke box (1), a rear smoke box (2), a modular boiler shell module (3), a third pass smoke pipe (4), a second pass smoke pipe (5), a combustion chamber (6), a viewing hole (7), a sealing cover (8), an exhaust pipe (9), a furnace shell (10), and a burner (11). The front smoke box (1) and the rear smoke box (2) are respectively fixedly installed at both ends of the boiler drum shell (31) of the modular boiler shell module (3). The third pass smoke pipe (4) set inside the boiler drum shell (31) is connected to the front smoke box (1) and the rear smoke box (2) respectively. The front smoke box (1) is connected to the combustion chamber (6) inside the boiler drum shell (31) through the second return smoke pipe (5). The observation hole (7) in the combustion chamber (6) is sealed by the sealing cover (8) installed on the rear smoke box (2). The exhaust pipe (9) is provided above the rear smoke box (2). The furnace liner (10) installed inside the front smoke box (1) is connected to the combustion chamber (6) and the front smoke box (1) respectively. The burner (11) installed on the front smoke box (1) extends into one end of the furnace liner (10).

2. The modularly assembled small steam boiler as described in claim 1, characterized in that: The modular boiler shell module (3) includes a boiler drum shell (31), a mounting base (32), a low-pressure boiler tank (33), a high-pressure boiler tank (34), a connecting pipe (35), a pressure gauge (36), and a main steam pipe (37). The main steam pipe (37) is installed on the top of the boiler drum shell (31), and a water injection pump assembly is installed on one side of it. The low-pressure boiler tank (33) and the high-pressure boiler tank (34) are fixedly installed on the side of the boiler drum shell (31) through the mounting base (32). The boiler drum shell (31), the low-pressure boiler tank (33), and the high-pressure boiler tank (34) are interconnected through the connecting pipe (35), and a pressure gauge (36) is installed on each of them.

3. A modularly assembled small steam boiler as described in claim 2, characterized in that: Solenoid valves are installed on the connecting pipes (35) that connect the boiler drum shell (31), the low-pressure boiler tank (33), and the high-pressure boiler tank (34). The solenoid valves and pressure gauges (36) are all connected to the controller signal.

4. A modularly assembled small steam boiler as described in claim 3, characterized in that: The outer shell of the boiler drum (31) is connected to the low-pressure boiler tank (33) and the high-pressure boiler tank (34) respectively through the connecting pipe (35). The low-pressure boiler tank (33) and the high-pressure boiler tank (34) are connected through the connecting pipe (35). All three are coated with heat-insulating paint. The connecting pipe (35) connecting the three adopts a standard interface design.

5. A modularly assembled small steam boiler as described in claim 4, characterized in that: Excess air inside the boiler drum shell (31) can be injected into the low-pressure boiler tank (33) through the connecting pipe (35), and high-pressure steam generated inside the boiler drum shell (31) can be injected into the high-pressure boiler tank (34) through the connecting pipe (35).

6. A modularly assembled small steam boiler as described in claim 5, characterized in that: Excess high-pressure steam inside the high-pressure boiler tank (34) can be injected into the low-pressure boiler tank (33) through the connecting pipe (35). A pressure relief valve is installed inside the low-pressure boiler tank (33).

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