Boiler flue gas treatment device of gas-steam combined cycle unit

Abstract

The utility model relates to the technical field of gas-steam combined cycle units, and discloses a gas-steam combined cycle unit boiler flue gas treatment device which comprises a heat exchanger and a flue gas circulation pipe arranged on one side of the heat exchanger, a chimney is arranged at the other end of the flue gas circulation pipe, and a smoke exhaust pipe is arranged at the upper end of the chimney. A treatment part is further arranged on one side of the chimney, waste heat in flue gas can be recycled through the heat exchanger, then the flue gas enters the chimney through the flue gas circulation pipe, the flue gas is filtered through the filtering component, impurities are blocked on the filtering component, the flue gas can continue to flow upwards, and the flue gas can be recycled. Therefore, the possibility that impurities are accumulated in the chimney can be reduced, the situation that the operation efficiency of equipment and the operation stability of a gas-steam combined cycle unit are affected due to impurity accumulation is avoided, then ammonia gas can enter the chimney from the ammonia gas storage tank and the gas inlet pipe through the valve, and the ammonia gas can react with sulfide under the action of the catalyst; and the emission of sulfides can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-steam combined cycle units, in particular to a flue gas treatment device for a boiler of a gas-steam combined cycle unit. Background Art

[0002] The gas-steam combined cycle unit is a highly efficient power generation system that combines the working principles of gas turbines and steam turbines to improve power generation efficiency and energy utilization. The entire production line of the gas-steam combined cycle unit includes many devices, including waste heat boiler equipment, which can capture the heat energy in the high-temperature exhaust gas emitted by the gas turbine.

[0003] For example, a waste heat utilization device for flue gas from a gas-steam combined cycle unit boiler with application number CN220366434U includes a gas turbine, a waste heat boiler, a heat exchanger and a chimney connected in sequence, and a booster fan is arranged in the chimney. The waste heat utilization device of the utility model is based on a gas-steam combined cycle unit, a heat exchanger is arranged after the waste heat boiler, and a booster fan is arranged in the chimney, which can not only complete the heat recovery of the flue gas from the waste heat boiler, but also solve the problem of insufficient space in the tail gas flue. The tail gas flue does not need to be rearranged and the original exhaust pressure of the gas turbine is not increased; the device has a simple structure, significant effect, low equipment and operation costs, and a wide range of applications.

[0004] The above patent proposes to set a heat exchanger after the waste heat boiler and set a booster fan in the chimney to complete the heat recovery of the flue gas of the waste heat boiler. However, during the use of the waste heat boiler, the flue gas of the waste heat boiler is prone to contain impurities. If it is not treated in time, it is easy to accumulate in the gas-steam combined cycle unit, affecting the operating efficiency of the equipment.

[0005] Therefore, we propose a flue gas treatment device for a gas-steam combined cycle unit boiler to solve the above-mentioned problems. Utility Model Content

[0006] The purpose of the utility model is to provide a flue gas treatment device for a gas-steam combined cycle unit boiler, so as to solve the problem that the flue gas of the waste heat boiler is prone to contain impurities, etc., which, if not treated in time, are likely to accumulate in the gas-steam combined cycle unit, affecting the operating efficiency of the equipment.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a flue gas treatment device for a boiler of a gas-steam combined cycle unit, comprising a heat exchanger arranged at the tail end of the boiler and a flue gas flow pipe arranged on one side of the heat exchanger, the heat exchanger is used to recover the waste heat in the flue gas, a chimney is arranged at the other end of the flue gas flow pipe, the flue gas flow pipe is used for the flow of flue gas, an exhaust pipe for flue gas discharge is arranged at the upper end of the chimney, and a treatment component is also arranged on one side of the chimney;

[0008] A filter component and a support plate are installed inside the chimney, and the support plate is placed on the upper end of the filter component. The filter component is used to filter impurities in the flue gas. A high-temperature resistant chassis is installed on the upper end of the support plate. A motor is arranged inside the high-temperature resistant chassis. The output end of the motor is connected to a rotating shaft, and a cleaning brush is arranged on the outer side of the rotating shaft. The cleaning brush is placed above the filter component. A catalyst is also arranged inside the chimney. The processing part includes an ammonia storage tank for storing ammonia and an air intake pipe arranged on one side of the ammonia storage tank. The other end of the air intake pipe is connected to the chimney, and a valve is arranged on the outer side of the air intake pipe. Impurities in the flue gas can be filtered through the filter component, and ammonia can be allowed to enter the chimney from the ammonia storage tank and the air intake pipe by using the valve.

[0009] Preferably, a discharge hopper is provided at the lower part of the chimney, and a sewage pipe is provided at the lower end of the chimney, and impurities can be discharged through the discharge hopper and the sewage pipe.

[0010] Preferably, a bracket for support is fixedly installed at the lower end of the chimney.

[0011] Preferably, an adsorption plate is also provided inside the chimney, and the adsorption plate is used to absorb odor in the smoke.

[0012] Preferably, a water spraying member is also provided on one side of the chimney.

[0013] Preferably, the water spraying member includes a water tank arranged on one side of the chimney and a water pipe arranged on one side of the water tank, a water pump is arranged inside the water tank, one end of the water pipe is connected to an interface at one end of the water pump, the other end of the water pipe passes through the chimney and is connected to an annular nozzle, the annular nozzle is placed inside the chimney, when the water pump is operating, the water in the water tank can be pumped out and discharged through the water pipe and the annular nozzle.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Through the chimney and treatment components, impurities in the flue gas can be filtered to prevent impurities from accumulating in the chimney and affecting the flow of flue gas, thereby avoiding affecting the stable operation of the gas-steam combined cycle unit. The treatment components can also be used to reduce sulfides in the flue gas, thereby reducing the impact on the environment.

[0016] 2. By providing a high temperature resistant chassis, rotating shaft, cleaning brush and water spraying parts, the water spraying parts can be used to spray water onto the filter components, and the motor, rotating shaft and cleaning brush can be used for cleaning, so as to avoid the filter components affecting the subsequent flow of smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the chimney of the utility model;

[0019] Figure 3 It is a plan view of the support plate and high temperature resistant chassis structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the water spraying member of the utility model.

[0021] In the figure: 1. heat exchanger; 2. flue gas circulation pipe; 3. chimney; 31. discharge hopper; 32. sewage pipe; 33. filter component; 34. support plate; 35. high temperature resistant chassis; 36. rotating shaft; 37. cleaning brush; 38. adsorption plate; 39. water spray part; 391. water tank; 392. water guide pipe; 393. annular nozzle; 4. bracket; 5. exhaust pipe; 6. treatment part; 61. ammonia storage tank; 62. air intake pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3 A flue gas treatment device for a gas-steam combined cycle unit boiler comprises a heat exchanger 1 arranged at the tail end of the boiler and a flue gas flow pipe 2 arranged at one side of the heat exchanger 1, wherein the heat exchanger 1 is used to recover the waste heat in the flue gas, a chimney 3 is arranged at the other end of the flue gas flow pipe 2, the flue gas flow pipe 2 is used for the flow of flue gas, a flue gas exhaust pipe 5 for flue gas discharge is arranged at the upper end of the chimney 3, and a treatment component 6 is also arranged at one side of the chimney 3, the waste heat in the flue gas can be recovered through the heat exchanger 1, and then the flue gas enters the chimney 3 through the flue gas flow pipe 2, and is treated with the treatment component 6, and finally discharged through the flue gas exhaust pipe 5 to complete the flue gas discharge;

[0024] The chimney 3 is provided with a filter element 33 and a support plate 34, the support plate 34 is placed at the upper end of the filter element 33, the filter element 33 is used to filter impurities in the flue gas, the upper end of the support plate 34 is provided with a high temperature resistant chassis 35, the interior of the high temperature resistant chassis 35 is provided with a motor, the output end of the motor is connected to a rotating shaft 36, the outer side of the rotating shaft 36 is provided with a cleaning brush 37, the cleaning brush 37 is placed above the filter element 33, the interior of the chimney 3 is also provided with a catalyst, the treatment unit 6 includes an ammonia storage ammonia A gas storage tank 61 and an air intake pipe 62 are arranged on one side of the ammonia storage tank 61, and the other end of the air intake pipe 62 is connected to the chimney 3, and a valve is arranged on the outside of the air intake pipe 62. Impurities in the flue gas can be filtered through the filter component 33, and the valve can be used to allow ammonia to enter the chimney 3 from the ammonia storage tank 61 and the air intake pipe 62, and can react with sulfide under the action of the catalyst, which can reduce the emission of sulfide, reduce the impurities in the discharged flue gas, and reduce the sulfide, thereby reducing the impact on the environment.

[0025] A discharge hopper 31 is disposed at the lower part of the chimney 3 , and a sewage pipe 32 is disposed at the lower end of the chimney 3 , and impurities can be discharged through the discharge hopper 31 and the sewage pipe 32 .

[0026] A support bracket 4 is fixedly mounted at the lower end of the chimney 3 to support the chimney 3 .

[0027] An adsorption plate 38 is also provided inside the chimney 3, and the adsorption plate 38 is used to absorb odor in the smoke.

[0028] In this embodiment: the waste heat in the flue gas can be recovered through the heat exchanger 1, and then the flue gas enters the chimney 3 through the flue gas circulation pipe 2, the flue gas can flow in the chimney 3, and the flue gas is filtered by the filter component 33, so that impurities are blocked on the filter component 33, and the flue gas can continue to flow upward, thereby reducing the possibility of impurities accumulating in the chimney 3, so as to avoid affecting the operating efficiency of the equipment and the stability of the operation of the gas-steam combined cycle unit due to the accumulation of impurities, and then a valve can be used to allow ammonia to enter the chimney 3 from the ammonia storage tank 61 and the air intake pipe 62, and react with sulfides under the action of the catalyst, which can reduce the emission of sulfides, reduce the impurities in the discharged flue gas, and reduce the sulfides, thereby reducing the impact on the environment, and the adsorption plate 38 can be used to adsorb odors.

[0029] Embodiment 2: This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 4 A water spraying member 39 is also provided on one side of the chimney 3.

[0030] The water spraying member 39 includes a water tank 391 arranged on one side of the chimney 3 and a water pipe 392 arranged on one side of the water tank 391. A water pump is arranged inside the water tank 391. One end of the water pipe 392 is connected to an interface at one end of the water pump. The other end of the water pipe 392 passes through the chimney 3 and is connected to an annular nozzle 393. The annular nozzle 393 is placed inside the chimney 3. When the water pump is operating, the water in the water tank 391 can be pumped out and discharged through the water pipe 392 and the annular nozzle 393.

[0031] In this embodiment: when the water pump is operating, the water in the water tank 391 can be pumped out and discharged through the water pipe 392 and the annular nozzle 393, and the filter element 33 can be sprayed with water. Then the motor is started to drive the rotating shaft 36 to rotate, so that the cleaning brush 37 can clean the filter element 33 to avoid affecting the subsequent circulation of smoke. Then the sewage and impurities can be discharged through the discharge hopper 31 and the sewage pipe 32.

[0032] Working principle: the waste heat in the flue gas can be recovered through the heat exchanger 1, and then the flue gas enters the chimney 3 through the flue gas circulation pipe 2, the flue gas can flow in the chimney 3, and the filter component 33 is used to filter the flue gas, so that impurities are blocked on the filter component 33, and the flue gas can continue to flow upward, and then the valve can be used to allow ammonia to enter the chimney 3 from the ammonia storage tank 61 and the air inlet pipe 62, and it can react with sulfide under the action of the catalyst to reduce the emission of sulfide. When the water pump is operating, the water in the water tank 391 can be pumped out and discharged through the water pipe 392 and the annular nozzle 393, and the filter component 33 can be sprayed with water. Then the motor is started to drive the rotating shaft 36 to rotate, so that the cleaning brush 37 can clean the filter component 33.

[0033] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flue gas treatment device for a gas-steam combined cycle unit boiler, comprising a heat exchanger (1) arranged at the tail end of the boiler and a flue gas flow pipe (2) arranged on one side of the heat exchanger (1), wherein the heat exchanger (1) is used to recover waste heat in the flue gas, a chimney (3) is arranged at the other end of the flue gas flow pipe (2), and the flue gas flow pipe (2) is used for the flow of flue gas, characterized in that: The upper end of the chimney (3) is provided with a smoke exhaust pipe (5) for exhausting smoke, and one side of the chimney (3) is also provided with a processing unit (6); A filter component (33) and a support plate (34) are installed inside the chimney (3), the support plate (34) is placed on the upper end of the filter component (33), a high temperature resistant chassis (35) is installed on the upper end of the support plate (34), a motor is arranged inside the high temperature resistant chassis (35), the output end of the motor is connected to a rotating shaft (36), a cleaning brush (37) is arranged on the outer side of the rotating shaft (36), and the cleaning brush (37) is placed above the filter component (33), a catalyst is also arranged inside the chimney (3), and the processing unit (6) comprises an ammonia storage tank (61) for storing ammonia and an air intake pipe (62) arranged on one side of the ammonia storage tank (61), the other end of the air intake pipe (62) is communicated with the chimney (3), and a valve is arranged on the outer side of the air intake pipe (62), so that impurities in the flue gas can be filtered through the filter component (33).

2. A flue gas treatment device for a gas-steam combined cycle unit boiler according to claim 1, characterized in that: A discharge hopper (31) is provided at the lower part of the chimney (3), and a sewage discharge pipe (32) is provided at the lower end of the chimney (3).

3. A flue gas treatment device for a gas-steam combined cycle unit boiler according to claim 2, characterized in that: A support bracket (4) is fixedly mounted on the lower end of the chimney (3).

4. A flue gas treatment device for a gas-steam combined cycle unit boiler according to claim 3, characterized in that: An adsorption plate (38) is also provided inside the chimney (3).

5. A flue gas treatment device for a gas-steam combined cycle unit boiler according to claim 4, characterized in that: A water spraying member (39) is also provided on one side of the chimney (3).

6. A flue gas treatment device for a gas-steam combined cycle unit boiler according to claim 5, characterized in that: The water spraying member (39) comprises a water tank (391) arranged on one side of the chimney (3) and a water guide pipe (392) arranged on one side of the water tank (391); a water pump is arranged inside the water tank (391); one end of the water guide pipe (392) is connected to an interface at one end of the water pump; the other end of the water guide pipe (392) passes through the chimney (3) and is connected to an annular nozzle (393); the annular nozzle (393) is arranged inside the chimney (3).

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