A flue gas temperature regulating device for power plant boiler SCR denitration

Abstract

The application discloses a flue gas temperature adjusting device for power plant boiler SCR denitration, and relates to the technical field of boiler tail gas SCR denitration, which comprises a temperature control box, a motor door movably arranged on the front side of the temperature control box, a main controller arranged on the front side of the motor door, and a fixed plate arranged in the inner cavity of the temperature control box.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler tail gas SCR denitration technology, in particular to a flue gas temperature adjusting device for power plant boiler SCR denitration. BACKGROUND

[0002] Flue gas denitration technology is an environmental protection technology that reduces the emission of nitrogen oxides (NOx) in combustion flue gas through physical and chemical methods. It is mainly divided into dry and wet methods, among which selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are the mainstream dry process in the field of building environmental engineering.

[0003] SCR technology uses a catalyst to achieve 80%-90% denitration efficiency in the temperature range of 320-400℃, but there is a risk of catalyst poisoning; SNCR technology achieves 30%-80% efficiency through high-temperature reaction at 850-1100℃, but the cost is lower and the ammonia escape amount is higher. The mixed process combines the advantages of both, and has engineering adaptability in system optimization and equipment modification workload.

[0004] At present, the temperature of the flue gas discharged by the power plant boiler is mostly between 110℃ and 160℃, if SCR technology is used for denitration, a temperature raising device is usually needed to raise the temperature of the flue gas to the range of 320-400℃, so as to achieve good denitration effect. The flue gas temperature adjusting device for power plant boiler SCR denitration in the prior art mostly uses a steam heater as a temperature raising tool, which can achieve good temperature control effect, but in actual use, it still has the following defects: after the steam heater produces high-temperature steam to heat the flue gas, condensate water will drop, and the condensate water still has a high temperature, but the traditional equipment does not have a treatment measure for the condensate water, causing resource waste. SUMMARY

[0005] The technical problem solved by the present application is to overcome the defects of the prior art that cannot recover condensate water and the high heat contained in the condensate water, and to provide a flue gas temperature adjusting device for power plant boiler SCR denitration.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a flue gas temperature adjusting device for power plant boiler SCR denitration, comprising a temperature control box, a motor door is movably installed on the front side of the temperature control box, a main control unit is installed on the front side of the motor door, a fixed plate is installed in the inner cavity of the temperature control box, a plurality of round holes are formed in the fixed plate, a one-way valve is installed in the inner cavity of each of the round holes, a fixed frame is arranged on the top of the fixed plate, a blocking net is installed in the inner cavity of the fixed frame, the top of the fixed frame is a temperature rising cavity, an installation assembly is arranged between the fixed frame and the fixed plate, a steam heater is installed on the bottom of the inner wall of the temperature control box, a temperature sensor is installed on the rear side of the inner wall of the temperature control box close to the top, a smoke inlet pipe is inserted and installed on the left side of the temperature control box close to the top, a smoke exhaust pipe is installed on the right side of the temperature control box close to the top, and a recovery water tank is installed on the outside of the temperature control box.

[0007] Preferably, a drain pipe and a water inlet pipe are respectively inserted and installed on the left and right sides of the steam heater, and the ends of the water inlet pipe and the drain pipe away from each other penetrate through the outer wall of the temperature control box and extend to the outside of the temperature control box.

[0008] Preferably, a horizontal groove is formed on the right side of the inner wall of the temperature control box, a water inlet groove is formed on the outer wall of the recovery water tank, and the water inlet groove and the horizontal groove are in communication.

[0009] Preferably, a water guide pipe and a connecting pipe are respectively inserted and installed on the left and right sides of the recovery water tank, and the connecting pipe is in butt joint with the water inlet pipe.

[0010] Preferably, both ends of the recovery water tank are open, two mounting frames are fixedly installed in the inner cavity of the recovery water tank, a plurality of threaded holes are formed in each of the mounting frames, sealing baffles are arranged on the outer sides of the mounting frames, the sealing baffles are embeddedly installed in the inner cavity of the recovery water tank, a plurality of fixed bolts are threadedly connected to the sealing baffles, and the fixed bolts are threadedly connected in the inner cavities of the corresponding threaded holes.

[0011] Preferably, the installation assembly comprises a fixed block, the fixed block is fixedly installed between the fixed plate and the fixed frame, a through groove is formed in the fixed block, two clamping grooves are formed in the front side of the inner wall of the through groove, a circular pipe is fixedly installed on the rear side of the inner wall of the temperature control box, a spring is fixedly installed on the rear side of the inner wall of the circular pipe, a circular rod is fixedly installed at the front end of the spring, the circular rod penetrates through the through groove and extends to the front side of the fixed block, two clamping blocks are fixedly installed on the outer wall of the circular rod, and the two clamping blocks are respectively clamped in the inner cavities of the corresponding clamping grooves.

[0012] Preferably, the main control unit is electrically connected with the steam heater and the temperature sensor.

[0013] Preferably, a visual window is embeddedly installed on the motor door, and the visual window is located on the top of the motor door.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. When the present invention is in use, a recovery water tank is provided. After the steam condenses inside the heating chamber, the condensed water passes through the barrier net and falls onto the surface of the fixed plate. Since the surface of the fixed plate is inclined and a one-way valve is provided inside the circular hole, steam can only pass through from bottom to top, and condensed water cannot pass through from top to bottom. At this time, the condensed water will follow the inclined surface of the fixed plate through the horizontal groove and the water inlet groove into the recovery water tank. The high-temperature condensed water inside the recovery water tank can directly enter the steam heater again through the connecting pipe for subsequent use, or it can be discharged through the water pipe and enter other equipment for subsequent high-temperature spraying to reduce the indoor temperature of the power plant.

[0016] 2. When the present invention is in use, by providing a card block, a card slot and a fixed block, when the barrier net and other components need to be disassembled and maintained later, the round rod can be pulled forward to make the two card blocks on the round rod disengage from the card slot respectively, and at the same time the round rod stretches the spring inside the round tube, and then the round rod is rotated to make the round rod drive the two card blocks to rotate. After the card block is rotated to be opposite to the through slot, the round rod is released, so that the round rod and the card block pass through the through slot under the elastic force of the spring. Subsequently, the fixing plate, the fixing block and the installation frame can be directly taken out from the inside of the temperature control box together, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention;

[0018] Figure 2 Schematic diagram of the internal three-dimensional structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal planar structure of the present invention;

[0020] Figure 4 For the present invention Figure 2 Schematic diagram of the local structure in;

[0021] Figure 5 It is a structural schematic diagram of the steam heater and the recovery water tank of the present invention;

[0022] Figure 6 This is a schematic diagram of the explosion structure of the water recovery tank of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the installation assembly of the present invention.

[0024] The figure label: 1, temperature control box; 2, electric door; 3, visible window; 4, main control unit; 5, steam heater; 51, water inlet pipe; 52, drain pipe; 6, fixed plate; 7, round hole; 8, fixed frame; 9, blocking net; 10, temperature rising cavity; 11, temperature sensor; 12, smoke inlet pipe; 13, smoke exhaust pipe; 14, transverse groove; 15, recycling water tank; 151, water inlet groove; 152, water guide pipe; 153, connecting pipe; 154, mounting bracket; 155, threaded hole; 156, sealing baffle; 157, fixed bolt; 16, mounting assembly; 161, fixed block; 162, through groove; 163, clamping groove; 164, round pipe; 165, spring; 166, round rod; 167, clamping block. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Please refer to Figures 1-7 The present application provides a technical solution: a flue gas temperature adjusting device for power plant boiler SCR denitration, comprising a temperature control box 1, the front side of the temperature control box 1 movably installed with an electric door 2, the front side of the electric door 2 installed with a main control unit 4, the inner cavity of the temperature control box 1 installed with a fixed plate 6, a plurality of round holes 7 are formed on the fixed plate 6, a plurality of round holes 7 are installed with a check valve in the inner cavity, the top of the fixed plate 6 is provided with a fixed frame 8, the inner cavity of the fixed frame 8 is installed with a blocking net 9, and the top of the fixed frame 8 is a temperature rising cavity 10, the installation assembly 16 is arranged between the fixed frame 8 and the fixed plate 6, the inner wall of the temperature control box 1 is installed with a steam heater 5 at the bottom, and the temperature sensor 11 is installed at the rear side of the inner wall of the temperature control box 1 close to the top, the smoke inlet pipe 12 is inserted and installed at the left side of the temperature control box 1 close to the top, and the smoke exhaust pipe 13 is installed at the right side of the temperature control box 1 close to the top, and the recycling water tank 15 is installed outside the temperature control box 1.

[0027] In this embodiment, in use, first, the smoke inlet pipe 12 and the smoke exhaust pipe 13 are respectively connected with the corresponding equipment, and the water source is injected into the steam heater 5, then the steam heater 5 is driven, the water source is produced into high-temperature steam by the steam heater 5, the high-temperature steam enters the inside of the heating cavity 10 along the plurality of round holes 7 and the blocking net 9, and the boiler flue gas enters the inside of the heating cavity 10 along the smoke inlet pipe 12, the boiler flue gas in the heating cavity 10 is rapidly heated by the high-temperature steam, and the flue gas heated to a specified stable state is discharged along the smoke exhaust pipe 13, during which, with the passage of time, more and more high-temperature steam enters the inside of the heating cavity 10, and a large amount of condensed water is generated along with the heat absorption of the flue gas, the condensed water also contains a certain amount of heat, and the condensed water generated under the action of its own gravity falls through the blocking net 9 on the surface of the fixed plate 6, and since the fixed plate 6 is arranged obliquely, the condensed water enters the inside of the recovery water tank 15 along the inclined surface.

[0028] As an optional implementation, the steam heater 5 is respectively inserted and installed with a drain pipe 52 and a water inlet pipe 51 on the left and right sides, and the water inlet pipe 51 and the drain pipe 52 are respectively penetrated through the outer wall of the temperature control box 1 and extended to the outside of the temperature control box 1.

[0029] In this embodiment, in use, the water source is injected into the inside of the steam heater 5 by the water inlet pipe 51, and then the excess water source in the steam heater 5 is discharged by the drain pipe 52 after the subsequent use is finished, so as to avoid that the water source is left in the steam heater 5 and affects the subsequent use.

[0030] As an optional implementation, a horizontal groove 14 is formed in the right side of the inner wall of the temperature control box 1, and a water inlet groove 151 is formed in the outer wall of the recovery water tank 15, and the water inlet groove 151 is in through arrangement with the horizontal groove 14.

[0031] In this embodiment, in use, after the condensed water is located on the surface of the fixed plate 6, the condensed water gradually slides and passes through the horizontal groove 14 and the water inlet groove 151, and finally enters the inside of the recovery water tank 15, and the inner diameters of the horizontal groove 14 and the water inlet groove 151 are the same, so that the condensed water can be avoided to be left in the horizontal groove 14 and the water inlet groove 151.

[0032] As an optional implementation, a water guide pipe 152 and a connecting pipe 153 are respectively inserted and installed on the left and right sides of the recovery water tank 15, and the connecting pipe 153 is connected and installed with the water inlet pipe 51.

[0033] In this embodiment, in use, according to actual conditions, the first use place of condensed water is selected, if the device needs to run for a long time, the connecting pipe 153 is connected with the water inlet pipe 51, so that the condensed water in the recovery water tank 15 enters the water inlet pipe 51, and finally enters the steam heater 5, and the condensed water itself has high temperature, which can be more rapid in subsequent steam generation, if the device is about to stop running, the condensed water with high temperature is transmitted to other equipment by the water guide pipe 152, and is used for subsequent high-temperature spraying, realizing the cooling of the plant room, and can also be used as a life water source for bathing, washing clothes and the like, realizing the purpose of saving water resources.

[0034] As an optional implementation, the recovery water tank 15 is open at both ends, and two mounting frames 154 are fixedly installed in the inner cavity of the recovery water tank 15, a plurality of threaded holes 155 are formed in the two mounting frames 154, and sealing baffles 156 are arranged on the outer sides of the two mounting frames 154. The sealing baffles 156 are embeddedly installed in the inner cavity of the recovery water tank 15, and a plurality of fixing bolts 157 are threadedly connected to the sealing baffles 156.

[0035] In this embodiment, in use, if it is necessary to clean the inside of the recovery water tank 15, the fixing bolts 157 are loosened and removed, the sealing baffles 156 are removed from the front side of the recovery water tank 15, then the cleaning tool is sent into the inside through the opening of the recovery water tank 15, and cleaning is performed, after cleaning is completed, the tool is taken out, and the sealing baffles 156 are clamped into the inside of the recovery water tank 15 again, and finally the fixing bolts 157 are used for fixing again, so that the sealing effect is realized, and the penetration and overflow of the condensed water are avoided.

[0036] As an optional implementation, the mounting assembly 16 includes a fixed block 161 fixedly installed between the fixed plate 6 and the fixed frame 8, a through slot 162 is formed in the fixed block 161, two clamping grooves 163 are formed in the front side of the inner wall of the through slot 162, a circular pipe 164 is fixedly installed on the rear side of the inner wall of the temperature control box 1, a spring 165 is fixedly installed on the rear side of the inner wall of the circular pipe 164, a circular rod 166 is fixedly installed at the front end of the spring 165, the circular rod 166 extends through the through slot 162 and extends to the front side of the fixed block 161, and two clamping blocks 167 are fixedly installed on the outer wall of the circular rod 166.

[0037] In the embodiment, when in use, the mounting assembly 16 is used to mount the fixed plate 6 and the fixed frame 8, and when the fixed plate 6 and the fixed frame 8 need to be dismounted, the circular rod 166 is pulled forward, so that the two clamping blocks 167 on the circular rod 166 are disengaged from the clamping grooves 163 respectively, and the spring 165 inside the circular tube 164 is stretched, then the circular rod 166 is rotated, so that the two clamping blocks 167 are rotated, after the clamping blocks 167 are rotated to be opposite to the through grooves 162, the circular rod 166 is loosened, so that the circular rod 166 and the clamping blocks 167 pass through the through grooves 162 under the elastic force of the spring 165, and then the fixed plate 6, the fixed block 161 and the fixed frame 8 can be directly taken out from the temperature control box 1, and the operation is convenient.

[0038] As an optional implementation, the main control device 4 is electrically connected with the steam heater 5 and the temperature sensor 11.

[0039] In the embodiment, when in use, the main control device 4 is used to control the opening and closing of the steam heater 5, and the temperature sensor 11 is used to sense the temperature inside the heating cavity 10 in real time, and the temperature information is fed back to the main control device 4, and the real-time temperature is displayed on the temperature display screen on the main control device 4, so that the staff can intuitively know the internal situation.

[0040] As an optional implementation, the visual window 3 is embedded on the electric door 2 and is located near the top of the electric door 2.

[0041] In the embodiment, when in use, the visual window 3 can be used to directly view the internal working progress.

[0042] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A flue gas temperature regulating device for SCR denitrification of a power plant boiler, comprising a temperature control box (1), characterized in that: An electric door (2) is movably installed on the front side of the temperature control box (1), and a main controller (4) is installed on the front side of the electric door (2). A fixed plate (6) is installed in the inner cavity of the temperature control box (1), and a plurality of circular holes (7) are opened on the fixed plate (6). The inner cavities of the plurality of circular holes (7) are all installed with one-way valves. A fixed frame (8) is provided on the top of the fixed plate (6), and a blocking net (9) is installed in the inner cavity of the fixed frame (8). The top of the fixed frame (8) is a temperature rising chamber (10). A mounting assembly (16) is provided between the fixed frame (8) and the fixed plate (6). A steam heater (5) is installed on the bottom of the inner wall of the temperature control box (1), and a temperature sensor (11) is installed on the rear side of the inner wall of the temperature control box (1) near the top. A smoke inlet pipe ( 12), and a smoke exhaust pipe (13) is installed on the right side of the temperature control box (1) near the top, and a recovery water tank (15) is installed on the outside of the temperature control box (1). A drainage pipe (52) and a water inlet pipe (51) are respectively installed on the left and right sides of the steam heater (5). The ends of the water inlet pipe (51) and the drainage pipe (52) are respectively connected to the outer wall of the temperature control box (1) and extend to the outside of the temperature control box (1). A transverse groove (14) is provided on the right side of the inner wall of the temperature control box (1). A water inlet groove (151) is provided on the outer wall of the recovery water tank (15). The water inlet groove (151) and the transverse groove (14) are connected. A water guide pipe (152) and a connecting pipe (153) are respectively installed on the left and right sides of the recovery water tank (15). The connecting pipe (153) is connected to the water inlet pipe (51).

2. The flue gas temperature regulating device for SCR denitrification of a power plant boiler according to claim 1, characterized in that: Both ends of the recovery water tank (15) are open, and two mounting brackets (154) are fixedly mounted in the inner cavity of the recovery water tank (15), and a plurality of threaded holes (155) are provided on the two mounting brackets (154). A sealing baffle (156) is provided on the outer side of the two mounting brackets (154), and the sealing baffle (156) is embedded in the inner cavity of the recovery water tank (15), and a plurality of fixing bolts (157) are threadedly connected to the sealing baffle (156), and the fixing bolts (157) are threadedly connected to the inner cavities of the corresponding threaded holes (155).

3. The flue gas temperature regulating device for SCR denitrification of a power plant boiler according to claim 1, characterized in that: The mounting assembly (16) includes a fixing block (161), the fixing block (161) is fixedly mounted between the fixing plate (6) and the fixing frame (8), and a through slot (162) is provided on the fixing block (161), two card slots (163) are provided on the front side of the inner wall of the through slot (162), a round tube (164) is fixedly mounted on the rear side of the inner wall of the temperature control box (1), a spring (165) is fixedly mounted on the rear side of the inner wall of the round tube (164), a round rod (166) is fixedly mounted on the front end of the spring (165), the front end of the round rod (166) passes through the through slot (162) and extends to the front side of the fixing block (161), and two card blocks (167) are fixedly mounted on the outer wall of the round rod (166), and the two card blocks (167) are respectively engaged in the inner cavity of the corresponding card slots (163).

4. The flue gas temperature regulating device for SCR denitrification of a power plant boiler according to claim 1, characterized in that: The main controller (4) is electrically connected to the steam heater (5) and the temperature sensor (11).

5. The flue gas temperature regulating device for SCR denitrification of a power plant boiler according to claim 1, characterized in that: A visual window (3) is embedded and installed on the electric door (2), and the visual window (3) is located near the top of the electric door (2).

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