Natural gas boiler energy-saving device

Abstract

The utility model discloses a natural gas boiler energy-saving device which comprises a plurality of natural gas boilers, and each natural gas boiler comprises a boiler barrel, a boiler furnace, a reversal chamber, a front smoke box and a rear smoke box. The boiler furnace and the reversal chamber are arranged in the boiler barrel, the front smoke box is arranged at the front end of the boiler barrel, and the rear smoke box is arranged at the rear end of the boiler barrel; the reversal chamber is arranged at the rear end of the boiler furnace and communicates with the boiler furnace, the front smoke box communicates with the reversal chamber through a first return stroke smoke pipe, and the front smoke box communicates with the rear smoke box through a second return stroke smoke pipe; and the reversal chambers of the natural gas boilers are communicated with one another. The device not only can meet steam requirements of downstream heat users, but also can reduce energy waste and improve economic benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas boilers, in particular to an energy-saving device for natural gas boilers. Background Art

[0002] Natural gas boilers are composed of two major components: the burner and the boiler body. The boiler combustion system is equipped with the corresponding burner and fuel supply system according to the fuel used. In general, the boiler uses a blower for micro-positive pressure combustion. In special cases, an induced draft fan is required for balanced ventilation. The boiler steam-water system should be equipped with a boiler body, tail energy-saving equipment (economizer, condenser, etc.), water treatment equipment, water supply pump, steam cylinder and other equipment.

[0003] The steam generated by natural gas boilers is mainly used for power generation in power plants. In order to achieve centralized heating, part of the steam from the generator set is pumped to heat users, realizing the cascade utilization of energy and avoiding the waste of low-grade thermal energy in power plants. At the same time, it reduces the pollution emissions of boilers during the heating season, which is conducive to the development of an environmentally friendly society.

[0004] Due to the different production plans of downstream heat users, the steam consumption will also be different. When the steam demand of heat users is large, the natural gas boilers used for power generation alone cannot meet the needs of heat users. Therefore, the power plant will set up multiple backup natural gas boilers. When the steam demand of heat users is large, the backup natural gas boilers will be started to generate steam and supply it to heat users; when the natural gas boilers used for power generation can meet the needs of heat users, the backup natural gas boilers will be shut down.

[0005] Since the steam demand of heat users is constantly changing, the standby natural gas boiler will be started frequently. After the natural gas boiler is shut down, the water in the natural gas boiler will cool down. When it is started later, the water needs to be reheated, resulting in a large waste of energy. Utility Model Content

[0006] The purpose of the utility model is to overcome the above-mentioned problems and provide a natural gas boiler energy-saving device, which can not only meet the steam demand of downstream heat users, but also reduce energy waste and improve economic benefits.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A natural gas boiler energy-saving device comprises a plurality of natural gas boilers, each of which comprises a boiler drum, a furnace, a re-ignition chamber, a front smoke box and a rear smoke box; the furnace and the re-ignition chamber are arranged in the boiler drum, the front smoke box is arranged at the front end of the boiler drum, and the rear smoke box is arranged at the rear end of the boiler drum; the re-ignition chamber is arranged at the rear end of the furnace and is connected to the furnace, the front smoke box is connected to the re-ignition chamber via a first return smoke pipe, and the front smoke box is connected to the rear smoke box via a second return smoke pipe; the re-ignition chambers of the plurality of natural gas boilers are connected to each other.

[0009] The working principle of the above-mentioned natural gas boiler energy-saving device is:

[0010] The flame generated by the burner burns in the furnace, and the furnace heats the water in the drum, thereby generating water vapor. The high-temperature flue gas generated by the furnace will pass through the re-entry chamber, the first return smoke pipe, the front smoke box, the second return smoke pipe and the rear smoke box in sequence, and finally be discharged from the flue gas outlet of the rear smoke box. The natural gas boiler energy-saving device in the utility model is provided with multiple natural gas boilers, one of which is a common natural gas boiler, which is used in power plants to generate electricity and supply heat to users, and is in a long-term working state, and the remaining natural gas boilers are used as standby natural gas boilers; since the re-entry chambers of multiple natural gas boilers are interconnected; when the standby natural gas boiler is shut down, the high-temperature flue gas in the re-entry chamber of the natural gas boiler in the working state will enter the re-entry chamber of the shut-down natural gas boiler, and the high-temperature flue gas will heat the water of the shut-down natural gas boiler to prevent cooling, so as to ensure that the water can be quickly heated when the shut-down natural gas boiler (i.e., the standby natural gas boiler) is started next time, thereby improving the utilization rate of energy and reducing energy consumption.

[0011] A preferred solution of the utility model is that the reburning chambers of the plurality of natural gas boilers are interconnected through a pipe assembly, the pipe assembly includes a main pipe and a plurality of branch pipes, the natural gas boilers are arranged in a one-to-one correspondence with the branch pipes, wherein one end of the branch pipe is connected to the reburning chamber, and the other end of the branch pipe is connected to the main pipe. By setting the pipe assembly, the connection between the reburning chambers is facilitated, and the high-temperature flue gas generated by the natural gas boiler in the working state can enter the natural gas boiler in the shutdown state through the pipe assembly, and the high-temperature flue gas can insulate and heat the water in the natural gas boiler.

[0012] Preferably, the branch pipeline is provided with a first electric valve. By providing the first electric valve, the branch pipeline can be opened and closed, which improves the flexibility of work; when some standby natural gas boilers are not used for a long time, the corresponding first electric valves can be closed, and the first electric valves corresponding to the commonly used natural gas boilers and the standby natural gas boilers with high frequency of use can be opened, which reduces energy waste.

[0013] Preferably, a second electric valve is provided between two adjacent branch pipes on the main pipe. By providing the second electric valve, the main pipe can be opened and closed, which improves the flexibility of work; when part of the standby natural gas boiler is not used for a long time, if only the corresponding first electric valve is closed, the corresponding main pipe will still retain high-temperature flue gas, increasing heat loss. By closing the corresponding second electric valve, the corresponding part of the main pipe will not retain high-temperature flue gas, reducing the heat loss of high-temperature flue gas, and further reducing energy waste.

[0014] Preferably, a smoke outlet is provided at the upper end of the rear smoke box, and a fan is provided at the smoke outlet. By providing the fan, the exhaust size of the smoke outlet can be controlled; when the common natural gas boiler is working, the fan of the common natural gas boiler can be turned off or the wind speed of the fan can be reduced. At the same time, the fan of the standby natural gas boiler is turned on. Under the suction effect of the fan, the high-temperature smoke of the common natural gas boiler will enter the backfire chamber of the standby natural gas boiler through the pipeline assembly to insulate and heat the standby natural gas boiler. By controlling the fan, the flow speed and direction of the high-temperature smoke can be achieved.

[0015] Preferably, the main pipe and the branch pipe are both insulation pipes. By using insulation pipes with insulation layers, a good insulation effect can be achieved, reducing heat loss of high-temperature flue gas during transportation.

[0016] Preferably, a burner is provided at the front end of the front smoke box, and the burner is connected to the front end of the furnace. The flame generated by the burner is sprayed into the furnace to heat the water outside the furnace to generate steam.

[0017] Preferably, the natural gas boiler energy-saving device further comprises a control module, which comprises a boiler control unit for controlling the burner and a standby heat control unit for controlling the fan, the first electric valve and the second electric valve. By setting the above boiler control unit, the operation and stop of each natural gas boiler can be controlled, specifically the burner is controlled. When the burner burns, the natural gas boiler can generate steam, and when the burner stops burning, the natural gas boiler stops generating steam; the standby heat control unit can control the operation of each fan, the first electric valve and the second electric valve, thereby improving the flexibility of the operation of the natural gas boiler and thus improving the energy-saving effect.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] In the natural gas boiler energy-saving device of the utility model, the combustion chambers of multiple natural gas boilers are interconnected, and the high-temperature flue gas in the combustion chambers of the natural gas boilers in a working state will enter the combustion chambers of the shut-down natural gas boilers. The high-temperature flue gas will heat the water of the shut-down natural gas boiler to prevent cooling, ensuring that the water can be quickly heated when the natural gas boiler is started next time, thereby improving energy utilization, reducing energy consumption, and thus improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of one specific implementation of a natural gas boiler energy-saving device in the utility model.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the natural gas boiler in the utility model.

[0022] Figure 3 It is a side view of the natural gas boiler in the utility model.

[0023] Figure 4 for Figure 3 Cross-sectional view along the AA direction.

[0024] Figure 5 It is a structural schematic diagram of the interconnected rewinding chambers of multiple natural gas boilers in the utility model.

[0025] Figure 6 It is a partial structural schematic diagram of the natural gas boiler in the utility model. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.

[0027] See also Figure 1-Figure 6 The present embodiment discloses a natural gas boiler energy-saving device, comprising a plurality of natural gas boilers 1, each natural gas boiler 1 comprising a boiler drum 2, a furnace 3, a reburning chamber 4, a front smoke box 5 and a rear smoke box 6; the furnace 3 and the reburning chamber 4 are arranged in the boiler drum 2, the front smoke box 5 is arranged at the front end of the boiler drum 2, and the rear smoke box 6 is arranged at the rear end of the boiler drum 2; the reburning chamber 4 is arranged at the rear end of the furnace 3 and is connected with the furnace 3, the front smoke box 5 is connected with the reburning chamber 4 through a first return smoke pipe 7, and the front smoke box 5 is connected with the rear smoke box 6 through a second return smoke pipe 8; the reburning chambers 4 of the plurality of natural gas boilers 1 are connected with each other.

[0028] See also Figure 1-Figure 6The retort chambers 4 of the multiple natural gas boilers 1 are interconnected through a pipeline assembly, and the pipeline assembly includes a main pipeline 9 and multiple branch pipelines 10. The natural gas boilers 1 are arranged one by one with the branch pipelines 10, wherein one end of the branch pipeline 10 is connected to the retort chamber 4, and the other end of the branch pipeline 10 is connected to the main pipeline 9. By setting the pipeline assembly, the connection of each retort chamber 4 is facilitated, and the high-temperature flue gas generated by the natural gas boiler 1 in the working state can enter the natural gas boiler 1 in the shutdown state through the pipeline assembly, and the high-temperature flue gas can keep warm and heat the water in the natural gas boiler 1.

[0029] See also Figure 1-Figure 6 The branch pipe 10 is provided with a first electric valve 11. By providing the first electric valve 11, the branch pipe 10 can be opened and closed, which improves the flexibility of work; when some standby natural gas boilers are not used for a long time, the corresponding first electric valve 11 can be closed, and the first electric valve 11 corresponding to the commonly used natural gas boiler and the standby natural gas boiler with high frequency of use can be opened, which reduces the waste of energy.

[0030] See also Figure 1-Figure 6 On the main pipeline 9, a second electric valve 12 is provided between two adjacent branch pipelines 10. By providing the second electric valve 12, the main pipeline 9 can be opened and closed, which improves the flexibility of work; when part of the standby natural gas boiler is not used for a long time, if only the corresponding first electric valve 11 is closed, the corresponding main pipeline 9 will still retain high-temperature flue gas, increasing heat loss. By closing the corresponding second electric valve 12, the corresponding part of the main pipeline 9 will not retain high-temperature flue gas, reducing the heat loss of high-temperature flue gas, and further reducing energy waste.

[0031] See also Figure 1-Figure 6 The upper end of the rear smoke box 6 is provided with a smoke outlet 13, and a fan 14 is provided at the smoke outlet 13. By setting the fan 14, the exhaust size of the smoke outlet 13 can be controlled; when the common natural gas boiler is working, the fan 14 of the common natural gas boiler can be turned off or the wind speed of the fan 14 can be reduced. At the same time, the fan 14 of the standby natural gas boiler is turned on. Under the suction effect of the fan 14, the high-temperature smoke of the common natural gas boiler will enter the backfire chamber 4 of the standby natural gas boiler through the pipeline assembly to keep warm and heat the standby natural gas boiler. By controlling the fan 14, the flow speed and direction of the high-temperature smoke can be achieved.

[0032] See also Figure 1-Figure 6In this embodiment, there are four natural gas boilers 1, which are the first natural gas boiler, the second natural gas boiler, the third natural gas boiler and the fourth natural gas boiler, respectively. The first natural gas boiler is a common natural gas boiler, and the second natural gas boiler, the third natural gas boiler and the fourth natural gas boiler are standby natural gas boilers. When the steam demand of the heat user is large, the standby natural gas boiler can be properly opened. In this embodiment, the number of branch pipes 10 is four, the number of second electric valves 12 on the main pipe 9 is three, and there is a second electric valve 12 between two adjacent branch pipes 10 (i.e., between two adjacent natural gas boilers 1); if the third natural gas boiler and the fourth natural gas boiler are not working, the second electric valve 12 between the second natural gas boiler and the third natural gas boiler can be closed, so that the part of the main pipe 9 corresponding to the third natural gas boiler and the fourth natural gas boiler cannot have high-temperature flue gas entering, thereby reducing the heat loss of high-temperature flue gas.

[0033] See also Figure 1-Figure 6 The main pipe 9 and the branch pipe 10 are both heat-insulating pipes. By adopting the heat-insulating pipe, the heat-insulating pipe has a heat-insulating layer, which can achieve a good heat-insulating effect and reduce the heat loss of high-temperature flue gas during transportation.

[0034] See also Figure 1-Figure 6 The front end of the front smoke box 5 is provided with a burner 15, and the burner 15 is connected to the front end of the furnace 3. The burner 15 burns to generate flames that will be sprayed into the furnace 3, heating the water outside the furnace 3 to generate steam.

[0035] See also Figure 1-Figure 6 The natural gas boiler energy-saving device further includes a control module 16, which includes a boiler control unit for controlling the burner 15 and a standby heat control unit for controlling the fan 14, the first electric valve 11 and the second electric valve 12. By setting the above boiler control unit, the operation and stop of each natural gas boiler 1 can be controlled, specifically the burner 15 is controlled. When the burner 15 burns, the natural gas boiler 1 can generate steam. When the burner 15 stops burning, the natural gas boiler 1 stops generating steam. The standby heat control unit can control the operation of each fan 14, the first electric valve 11 and the second electric valve 12, thereby improving the flexibility of the operation of the natural gas boiler 1 and thus improving the energy-saving effect.

[0036] See also Figure 1-Figure 6 The flue gas outlet 13 is also provided with an economizer 17 for recovering waste heat of the flue gas. The reburning chamber 4 is also provided with a fire observation hole 18, which can observe the combustion of gas in the furnace 3 at any time, so as to facilitate monitoring the operation of the natural gas boiler 1.

[0037] See also Figure 1-Figure 6 The working principle of the above-mentioned natural gas boiler energy-saving device is:

[0038] The flame generated by the burner 15 burns in the furnace 3, and the furnace 3 heats the water in the drum 2, thereby generating water vapor. The high-temperature flue gas generated by the furnace 3 will pass through the reburning chamber 4, the first return smoke pipe 7, the front smoke box 5, the second return smoke pipe 8 and the rear smoke box 6 in sequence, and finally be discharged from the furnace from the smoke outlet 13 of the rear smoke box 6. The natural gas boiler energy-saving device in the utility model is provided with multiple natural gas boilers 1, one of which is a common natural gas boiler, which is used in power plants to generate electricity and supply heat to users, and is in a long-term working state, and the remaining natural gas boilers 1 are used as standby natural gas boilers; since the reburning chambers 4 of the multiple natural gas boilers 1 are interconnected; when the standby natural gas boiler is shut down, the high-temperature flue gas in the reburning chamber 4 of the natural gas boiler 1 in the working state will enter the reburning chamber 4 of the shut down natural gas boiler 1, and the high-temperature flue gas will heat the water of the shut down natural gas boiler 1 to prevent cooling, so as to ensure that the water can be quickly heated when the natural gas boiler 1 is started next time, thereby improving the utilization rate of energy and reducing energy consumption. The high-temperature flue gas generated by the working standby natural gas boiler can also enter the reburning chamber 4 of the shut-down standby natural gas boiler through the pipeline assembly.

[0039] The above is a preferred implementation mode of the present invention, but the implementation mode of the present invention is not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A natural gas boiler energy saving device, characterized in that: It comprises a plurality of natural gas boilers, each of which comprises a boiler drum, a furnace, a re-ignition chamber, a front smoke box and a rear smoke box; the furnace and the re-ignition chamber are arranged in the boiler drum, the front smoke box is arranged at the front end of the boiler drum, and the rear smoke box is arranged at the rear end of the boiler drum; the re-ignition chamber is arranged at the rear end of the furnace and is connected with the furnace, the front smoke box is connected with the re-ignition chamber through a first return smoke pipe, and the front smoke box is connected with the rear smoke box through a second return smoke pipe; the re-ignition chambers of the plurality of natural gas boilers are connected with each other.

2. A natural gas boiler energy-saving device according to claim 1, characterized in that: The reburning chambers of the multiple natural gas boilers are interconnected through a pipeline assembly, and the pipeline assembly includes a main pipeline and multiple branch pipelines. The natural gas boilers are arranged in a one-to-one correspondence with the branch pipelines, wherein one end of the branch pipeline is connected to the reburning chamber, and the other end of the branch pipeline is connected to the main pipeline.

3. A natural gas boiler energy-saving device according to claim 2, characterized in that: The branch pipe is provided with a first electric valve.

4. A natural gas boiler energy-saving device according to claim 3, characterized in that: A second electric valve is provided between two adjacent branch pipes on the main pipe.

5. A natural gas boiler energy-saving device according to claim 4, characterized in that: A smoke outlet is provided at the upper end of the rear smoke box, and a fan is provided at the smoke outlet.

6. A natural gas boiler energy-saving device according to claim 2, characterized in that: The main pipeline and the branch pipeline are both thermal insulation pipes.

7. A natural gas boiler energy-saving device according to claim 1, characterized in that: A burner is provided at the front end of the front smoke box, and the burner is communicated with the front end of the furnace.

8. A natural gas boiler energy-saving device according to claim 5, characterized in that: The natural gas boiler energy-saving device further comprises a control module, wherein the control module comprises a boiler control unit for controlling the burner and a standby heat control unit for controlling the fan, the first electric valve and the second electric valve.

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