Waste heat recovery machine for flue gas of gas-fired boiler

Abstract

The utility model relates to the technical field of flue gas recovery, in particular to a waste heat recovery machine for flue gas of a gas-fired boiler, which comprises a boiler and a water inlet pipeline. The water inlet pipeline communicates with the upper portion of the side wall of the boiler, a base is installed at the bottom of the boiler, the upper portion of the side wall of the boiler outwards communicates with steam equipment through a steam conveying pipe, the upper portion of the side wall of the steam equipment outwards communicates with a smoke exhaust pipe, and one side of the smoke exhaust pipe communicates with a set of waste heat return pipes in a controlled mode. The tail end of the waste heat backflow pipe extends to the lower side outside the boiler to communicate with a waste heat heat preservation mechanism, one side of the top of the waste heat heat preservation mechanism outwards communicates with a transfer conveying pipe, the end of the transfer conveying pipe communicates with a waste heat cavity layer arranged in the pipe wall of the water inlet pipeline, and flowing and heat-preserved gas is transferred to the outer side of the waste heat cavity layer again. In this way, the water to be input into the boiler is preheated, and therefore the efficiency of heating the water in the boiler subsequently is improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas recovery technology, specifically a waste heat recovery machine for flue gas from a gas-fired boiler. Background Technology

[0002] Industrial gas-fired boilers are common industrial equipment that heats water at 15-25℃ to boiling point and produces high-temperature steam. The fuel used is mainly gas, which consumes a lot of energy. The problem of energy shortage has always existed. An industrial gas-fired boiler system consists of many devices, and the waste heat recovery system is only a part of the industrial gas-fired boiler system used to recover waste heat from flue gas.

[0003] In existing gas-fired boilers, the waste heat from flue gas is often diverted to a location far from the boiler itself for reuse. While this effectively utilizes the waste heat, long-distance heat transfer leads to resource waste and increases transmission and utilization costs.

[0004] Therefore, in view of the above-mentioned problems, this technical solution proposes a waste heat recovery machine for flue gas from gas-fired boilers. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery machine for flue gas from a gas-fired boiler, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery machine for flue gas from a gas-fired boiler, comprising a boiler and a water inlet pipe; the water inlet pipe is connected to the upper part of the boiler side wall for injecting water into the boiler; a base is installed at the bottom of the boiler; a steam device is connected to the upper part of the boiler side wall outward through a steam transmission pipe; the hot steam generated by combustion inside the boiler is input into the steam device for use along the steam transmission pipe; a flue gas exhaust pipe is connected to the upper part of the steam device side wall outward, that is, the flue gas used inside the steam device is discharged outward along the flue gas exhaust pipe; simultaneously, on one side of the flue gas exhaust pipe... The control system has a set of waste heat return pipes. The end of the waste heat return pipes extends to the lower side of the boiler and is connected to a waste heat insulation mechanism. The waste heat insulation mechanism transfers the heat of the flue gas to be discharged from the flue gas exhaust pipe along the outside of the boiler, thereby reducing the amount of heat loss from the boiler. At the same time, a transfer transmission pipe is connected to the top side of the waste heat insulation mechanism. The end of the transfer transmission pipe is connected to a waste heat cavity layer set in the wall of the water inlet pipe. The gas that has been insulated is transferred again to the outside of the waste heat cavity layer to preheat the water to be input into the boiler, thereby improving the efficiency of subsequent heating and temperature rise inside the boiler.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting up a simple pipeline structure for transmission, the waste heat of the flue gas after conversion inside the steam equipment is transferred to the bottom input cavity ring, and then flows automatically upward along the inside of the insulation cavity layer, which blocks the heat dissipation inside the boiler to a certain extent, thereby improving the insulation effect. Then, the used flue gas is transferred to the waste heat cavity layer again to preheat the water injected into the boiler, thereby realizing the full utilization of waste heat and applying it directly to the boiler, improving the boiler's operating efficiency and reducing the waste of transmission resources. Attached Figure Description

[0008] Figure 1 This is a front view schematic diagram of the internal structure of a waste heat recovery machine for flue gas from a gas-fired boiler.

[0009] Figure 2 This is a schematic diagram of the distribution structure of the bottom input ring and the top output ring in a waste heat recovery machine for flue gas from a gas-fired boiler.

[0010] Figure 3 for Figure 1 A magnified structural diagram of A in the diagram.

[0011] The components include: boiler 10, base 11, steam transmission pipe 12, steam equipment 13, flue gas exhaust pipe 14, waste heat return pipe 15, bottom input cavity ring 16, top output cavity ring 17, input connecting valve 18, inner input connecting pipe 19, inner output connecting pipe 20, output connecting valve 21, transfer transmission pipe 22, water inlet pipe 23, waste heat cavity layer 24, exhaust port 25, heat insulation cavity layer 26, and heat insulation layer 28. Detailed Implementation

[0012] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0013] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] Please see Figures 1-3A waste heat recovery machine for flue gas from a gas-fired boiler includes a boiler 10 and a water inlet pipe 23. The water inlet pipe 23 is connected to the upper part of the side wall of the boiler 10 for injecting water into the boiler 10. A base 11 is installed at the bottom of the boiler 10. A steam device 13 is connected to the upper part of the side wall of the boiler 10 through a steam transmission pipe 12. The hot steam generated by combustion inside the boiler 10 is input into the steam device 13 for use along the steam transmission pipe 12. A flue gas exhaust pipe 14 is connected to the upper part of the side wall of the steam device 13, that is, the flue gas used inside the steam device 13 is discharged outward along the flue gas exhaust pipe 14. At the same time, a controlled connection is made on one side of the flue gas exhaust pipe 14. There is a set of waste heat return pipes 15. The end of the waste heat return pipes 15 extends to the lower side of the outside of the boiler 10 and is connected to a waste heat insulation mechanism. The waste heat insulation mechanism transfers the heat of the flue gas to be discharged in the flue gas discharge pipe 14 along the outside of the boiler 10, thereby reducing the amount of heat loss from the inside of the boiler 10. At the same time, the top side of the waste heat insulation mechanism is connected to a transfer transmission pipe 22. The end of the transfer transmission pipe 22 is connected to a waste heat cavity layer 24 set in the wall of the water inlet pipe 23. That is, the gas after flow insulation is transferred again to the outside of the waste heat cavity layer 24, thereby preheating the water to be input into the boiler 10, which is beneficial to the efficiency of subsequent heating and temperature rise inside the boiler 10.

[0017] In this embodiment of the invention, the waste heat insulation mechanism includes an insulation cavity layer 26 opened on the outside of the furnace wall of the boiler 10, and an insulation layer 28 is provided on the outside of the insulation cavity layer 26 to maintain a constant internal temperature of the insulation cavity layer 26.

[0018] A set of top output cavity rings 17 and bottom input cavity rings 16 are respectively inserted into the upper and lower outer walls of the insulation cavity layer 26. Multiple internal input connecting pipes 19 are installed at equal intervals in a ring on the inner wall of the bottom input cavity ring 16, and these internal input connecting pipes 19 are inserted into the insulation cavity layer 26. An input connecting valve 18 is provided outwardly on the outer side of the bottom input cavity ring 16, and the input connecting valve 18 is connected to the bottom of the waste heat return pipe 15. Multiple internal output connecting pipes 20 are installed at equal intervals in a ring on the inner wall of the top output cavity ring 17, and these internal output connecting pipes 20 are connected to the interior of the insulation cavity layer 26. The outer side of the top output chamber ring 17 is connected to the transfer and transmission pipe 22. Under the transmission of the waste heat return pipe 15, the waste heat of the flue gas is transferred to the bottom input chamber ring 16, and then input into the bottom wall of the insulation chamber layer 26 along the inner input connecting pipe 19. Then it flows automatically upward along the inside of the insulation chamber layer 26, and finally transfers to the top output chamber ring 17 through the inner output connecting pipe 20. After passing through the output connecting valve 21, it is input into the transfer and transmission pipe 22, and then input into the waste heat chamber layer 24 for reuse, thereby realizing the full recovery and use of the waste heat of the flue gas.

[0019] An exhaust port 25 is provided at the lower part of the waste heat chamber layer 24 near the boiler 10, through which the flue gas flowing along the interior of the waste heat chamber layer 24 is discharged.

[0020] In one embodiment of the present invention, solenoid valves are installed on both the flue gas discharge pipe 14 and the waste heat return pipe 15 to control the flow of flue gas in the flue gas discharge pipe 14 and the waste heat return pipe 15. A pressure gauge is installed on one side of the top of the boiler 10 to detect the changes in steam pressure inside the boiler 10 in real time.

[0021] The working principle of this utility model is as follows: In the idle position of this device, all the aforementioned driving components, referring to power elements, electrical components, and compatible power supplies, are connected via wires. The electrical connections are completed in sequence between the working components. The detailed connection methods are well-known in the field. The following mainly describes the working principle and process, without further explanation of the electrical control. During operation, water is introduced into the boiler 10 through the inlet pipe 23 for heating to form steam. Then, the steam is transferred to the steam equipment 13 through the steam transmission pipe 12 for utilization. During the conversion and utilization process of the steam inside the steam equipment 13, due to the limited utilization rate, some... The waste heat from the steam is discharged outward along the flue gas discharge pipe 14. At this time, according to the need for waste heat recovery and utilization, the solenoid valves on the flue gas discharge pipe 14 and the waste heat return pipe 15 are controlled to input the waste heat into the bottom input cavity ring 16 along the waste heat return pipe 15. Then, under the transmission of the inner input connecting pipe 19, it is injected into the insulation cavity layer 26 and flows upward along the inside of the insulation cavity layer 26, thereby providing a certain degree of insulation for the inside of the boiler 10. Then, it is transferred to the waste heat cavity layer 24 through the top output cavity ring 17 and the transfer transmission pipe 22 to preheat the water to be entered into the boiler 10. Finally, it is discharged outward through the waste heat cavity layer 24.

[0022] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A waste heat recovery machine for flue gas from a gas-fired boiler, characterized in that, The system includes a boiler (10) and a water inlet pipe (23). The water inlet pipe (23) is connected to the upper part of the side wall of the boiler (10). A base (11) is installed at the bottom of the boiler (10). A steam device (13) is connected to the upper part of the side wall of the boiler (10) through a steam transmission pipe (12). A flue gas exhaust pipe (14) is connected to the upper part of the side wall of the steam device (13). A set of waste heat return pipes (15) is connected to one side of the flue gas exhaust pipe (14). The end of the waste heat return pipe (15) extends to the lower side of the boiler (10) and is connected to a waste heat insulation mechanism. A transfer transmission pipe (22) is connected to the top side of the waste heat insulation mechanism. A waste heat cavity layer (24) is connected to the end of the transfer transmission pipe (22) in the wall of the water inlet pipe (23).

2. A waste heat recovery machine for flue gas from a gas-fired boiler according to claim 1, characterized in that, The waste heat insulation mechanism includes an insulation cavity layer (26) opened on the outside of the boiler (10) furnace wall, and an insulation layer (28) is provided on the outside of the insulation cavity layer (26).

3. A waste heat recovery machine for flue gas from a gas-fired boiler according to claim 2, characterized in that, The upper and lower outer walls of the insulation cavity layer (26) are respectively connected to a set of top output cavity rings (17) and bottom input cavity rings (16). The inner wall of the bottom input cavity ring (16) is equipped with multiple inner input connecting pipes (19) at equal intervals. The inner input connecting pipes (19) are inserted into the insulation cavity layer (26). An input connecting valve (18) is provided on the outer side of the bottom input cavity ring (16) and is connected to the bottom of the waste heat return pipe (15). The inner wall of the top output cavity ring (17) is equipped with multiple inner output connecting pipes (20) at equal intervals. The inner output connecting pipes (20) are connected to the inside of the insulation cavity layer (26). The outer side of the top output cavity ring (17) is connected to the transfer transmission pipe (22).

4. A waste heat recovery machine for flue gas from a gas-fired boiler according to claim 3, characterized in that, The waste heat chamber layer (24) has an exhaust port (25) at the lower part of the side near the boiler (10).

5. A waste heat recovery machine for flue gas from a gas-fired boiler according to claim 4, characterized in that, Solenoid valves are installed on both the flue gas emission pipe (14) and the waste heat return pipe (15).

6. A waste heat recovery machine for flue gas from a gas-fired boiler according to claim 1, characterized in that, A pressure gauge is installed on one side of the top of the boiler (10).

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