An ammonia filter sampling device

Abstract

The utility model relates to gas ammonia filter sampling technical field especially, it relates to a kind of ammonia filter sampling device, comprising: primary particulate filter, sampling tube, ammonia filter, secondary particulate filter, flange pipe and flue, one end of the flange pipe is vertically through the top wall of flue and extends to its inside, the flange pipe is fixedly connected with the top of flue, the primary particulate filter is set in the inside of flue, one end of the primary particulate filter is communicated with the one end of sampling tube, the sampling tube is movably arranged in the flange pipe, the other end of the sampling tube is communicated with ammonia filter, one end of the ammonia filter is fixedly installed in the other end of flange pipe, the other end of the ammonia filter is communicated with secondary particulate filter, the utility model provides a kind of ammonia filter sampling device capable of avoiding the blockage of the measurement and analysis system of denitration flue gas, the poisoning situation of zirconium oxide nitric oxide sensor occurs.

Description

Technical Field

[0001] This utility model relates to the field of gas ammonia filtration sampling technology, and in particular to an ammonia filtration sampling device. Background Technology

[0002] The flow field of denitrification flue gas in thermal power plants is affected by factors such as flue structure and catalysts, resulting in uneven distribution of flow velocity and composition. In particular, in order to meet the NOx emission limits at the chimney outlet, a large amount of ammonia is injected, leading to excessive ammonia escape, which blocks the air preheater and online analysis equipment, especially affecting the accuracy and service life of the zirconium oxide nitric oxide sensor. Currently, most denitrification CEMS systems use the cold dry method to measure nitric oxide and oxygen. Due to uneven flow field in the flue and excessive ammonia injection, the sampling probe and sampling pipeline need to be cleaned every two weeks, which increases the maintenance workload on site and affects the system's uptime. Some power plant denitrification precision ammonia injection CEMS systems use in-situ zirconium oxide to measure nitric oxide and oxygen. If the flue gas contains a large amount of ammonia, it will affect the accuracy and service life of the sensor. Therefore, given the current issues of clogging and zirconium oxide nitric oxide sensor poisoning in existing denitrification flue gas measurement and analysis systems, it is of great significance to develop an ammonia filtration sampling device for denitrification CEMS. Utility Model Content

[0003] The purpose of this invention is to provide an ammonia filtration sampling device to solve the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: An ammonia filtration sampling device includes: a primary particulate filter, a sampling tube, an ammonia filter, a secondary particulate filter, a flange tube, and a flue. One end of the flange tube vertically penetrates the top wall of the flue and extends into its interior. The flange tube is fixedly connected to the top of the flue. The primary particulate filter is disposed inside the flue. One end of the primary particulate filter is connected to one end of the sampling tube. The sampling tube is movably inserted into the flange tube. The other end of the sampling tube is connected to the ammonia filter. One end of the ammonia filter is fixedly installed at the other end of the flange tube. The other end of the ammonia filter is connected to the secondary particulate filter.

[0005] Furthermore, the primary particulate filter includes: a metal powder filter tube, an end ring, an external threaded connector, and a sealing plate. The metal powder filter tube is made of 316L stainless steel powder sintered together. The metal powder filter tube is cylindrical. One end of the metal powder filter tube is coaxially and fixedly connected to the external threaded connector via the end ring. The other end of the metal powder filter tube is sealed and fixedly connected to the sealing plate. The external threaded connector communicates with the inner cavity of the metal powder filter tube.

[0006] Furthermore, a hexagonal head is fixedly connected to the middle position of the outer end of the sealing plate.

[0007] Furthermore, the primary particulate filter also includes: an inner tube, an axial air outlet channel is provided at the middle of the outer end of the external threaded connector, and a plurality of radial air inlets are uniformly provided on the side wall of the external threaded connector, the plurality of radial air inlets being connected to the axial air outlet channel and the inner cavity of the metal powder filter tube respectively; the two ends of the inner tube are respectively fixedly connected to the end of the external threaded connector facing the sealing plate, the outer wall of the inner tube has a gap with the inner wall of the metal powder filter tube, and the axial air outlet channel and the plurality of radial air inlets are not connected to the inner cavity of the inner tube.

[0008] Furthermore, the sampling tube includes: a stainless steel tube, an external threaded connector, and an internal threaded connector. The two axial ends of the stainless steel tube are respectively fixedly connected to the external threaded connector and the internal threaded connector. Both the external threaded connector and the internal threaded connector are connected to the inner cavity of the stainless steel tube. The internal threaded connector is threaded onto the external threaded connector, and its axial air outlet is connected to the inner cavity of the stainless steel tube.

[0009] Furthermore, the ammonia filter includes: a second stainless steel pipe, a first flange, a second flange, a second internally threaded connector, and ammonia filter zeolite. The inner cavity of the second stainless steel pipe is filled with ammonia filter zeolite. The second flange is coaxially sleeved and fixed to the outer wall of one end of the second stainless steel pipe. One end of the second flange is coaxially fixedly connected to the other end of the second stainless steel pipe. An axial vent hole communicating with the inner cavity of the second stainless steel pipe is opened in the middle of the second flange. The other end of the second flange is coaxially fixedly connected to the second internally threaded connector, which communicates with the axial vent hole. The second externally threaded connector is threadedly connected to the second internally threaded connector. The second flange is coaxially fixedly installed on the outer axial end of the flange pipe. A flange sealing gasket is provided between the second flange and the flange pipe.

[0010] Furthermore, it also includes: a backflush pipe, wherein one or more radially arranged backflush holes are opened on the flange two, one end of the backflush hole is connected to the outside, and the other end is connected to the axial vent hole, and a backflush pipe is inserted into the backflush hole.

[0011] Furthermore, the secondary particulate filter includes: a housing, a third flange, a cover, a filter element, and an air outlet. The housing is a cylindrical structure that runs vertically through the interior. The bottom end of the housing is fixed and connected to the third flange, which is coaxially fixedly connected to the first flange. A flange sealing gasket is provided between the connection between the third flange and the first flange. The top end of the housing is sealed and fixedly installed with the cover. The bottom center of the cover is fixedly connected with the filter element, which is a ceramic filter element. The filter element is hollow inside, closed at the bottom, and open at the top. The filter element is movably disposed in the inner cavity of the housing. An exhaust channel is provided inside the cover. One end of the exhaust channel is connected to the hollow inner cavity of the filter element. An air outlet is fixedly installed on the side wall of the cover, and the other end of the exhaust channel is connected to the air outlet.

[0012] Furthermore, the secondary particulate filter also includes: a housing, a cover, and fasteners. The housing is a hollow cuboid structure with openings at the top and right side. The cover is an L-shaped plate structure. Two fasteners are provided. The top left and bottom right sides of the cover are detachably fixed to the top left and bottom right sides of the housing by two fasteners, respectively. The cover can completely close the openings at the top and right sides of the housing. A round hole is provided at the bottom of the housing. The housing slides through the round hole. The bottom of the housing is fixedly installed at the top of the flange.

[0013] Furthermore, the secondary particulate filter also includes an electric heater and a temperature sensor, which are respectively fixedly connected to the outer wall of the housing. Compared with the prior art, the beneficial effects of this utility model are: 1. An ammonia filter was added between the primary particulate filter and the secondary particulate filter to remove the ammonia gas after the dust filter.

[0014] Second, backflush holes were added at the flange of the ammonia filter to enable periodic purging of the primary particulate filter from the inside out.

[0015] 3. The ammonia filtration sampling device is installed vertically above the flue. The flue gas flows from inside the flue to outside the flue, where it exchanges heat with the ambient air. The flue gas then condenses naturally and flows back into the flue, reducing the replacement cycle of the ammonia filter and extending the service life of the sampling equipment.

[0016] The fourth and second stage particulate filters have a heating function and are equipped with a 1µm ceramic filter element inside, which can further remove particulate matter in the flue gas and prevent small particles from clogging the sampling pipeline and other pretreatment equipment.

[0017] V. This utility model filters most of the particulate matter in the flue through a primary particulate filter, reducing the possibility of natural condensation of the flue gas after it exits the flue and causing blockage of the pipe. Then, it passes through an ammonia filter to filter the ammonia in the flue gas, reducing ammonia salt crystallization blockage and reducing ammonia interference in measurement. The flue gas after ammonia filtration then passes through a secondary particulate filter, which is heated to 220°C and has a filtration accuracy of 1 micron, to further remove fine particulate matter and ensure the normal operation of the sampling and analysis equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the primary particulate filter in this utility model; Figure 3 This is a schematic diagram of the sampling tube in this utility model; Figure 4 This is a schematic diagram of the ammonia filter in this utility model; Figure 5 This is a cross-sectional view of the secondary particulate filter in this utility model; Figure 6 This is a schematic diagram of the internal structure of the secondary particulate filter in this utility model.

[0019] The labels in the attached diagram are as follows: 1-First-stage particulate filter, 101-Metal powder filter tube, 102-End ring, 103-External threaded connector one, 1031-Axial outlet channel, 1032-Radial inlet channel, 104-Sealing plate, 105-Hexagonal head, 106-Inner tube, 2-Sampling tube, 201-Stainless steel tube one, 202-External threaded connector two, 203-Internal threaded connector one, 3-Ammonia filter, 301-Stainless steel tube two, 3 02-Flange 1, 303-Flange 2, 3031-Axial vent, 304-Internal threaded connector 2, 305-Ammonia filter zeolite, 4-Secondary particulate filter, 401-Shell, 402-Flange 3, 403-Shell cover, 4031-Exhaust passage, 404-Filter element, 405-Air outlet, 406-Cover, 407-Cover, 408-Snap fastener, 5-Flange pipe, 6-Flange gasket, 7-Fluoride flue, 8-Backflush pipe. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] See Figures 1-6As shown, an ammonia filtration sampling device includes: a primary particulate filter 1, a sampling tube 2, an ammonia filter 3, a secondary particulate filter 4, a flange tube 5, and a flue 7. One end of the flange tube 5 vertically penetrates the top wall of the flue 7 and extends into its interior. The flange tube 5 is fixedly connected to the top of the flue 7. The primary particulate filter 1 is disposed inside the flue 7. One end of the primary particulate filter 1 is connected to one end of the sampling tube 2. The sampling tube 2 is movably inserted into the flange tube 5. The other end of the sampling tube 2 is connected to the ammonia filter 3. One end of the ammonia filter 3 is fixedly installed at the other end of the flange tube 5. The other end of the ammonia filter 3 is connected to the secondary particulate filter 1.

[0022] In this embodiment, the primary particulate filter 1 includes: a metal powder filter tube 101, an end ring 102, an external threaded connector 103, and a sealing plate 104. The metal powder filter tube 101 is made of 316L stainless steel powder sintered and has a filtration accuracy of 10 micrometers, which can filter larger particles in the flue gas. The metal powder filter tube 101 is cylindrical. One end of the metal powder filter tube 101 is coaxially fixedly connected to the external threaded connector 103 through the end ring 102, and the other end of the metal powder filter tube 101 is sealed and fixedly connected to the sealing plate 104. The external threaded connector 103 communicates with the inner cavity of the metal powder filter tube 101. The primary particulate filter 1 filters most of the particles in the flue 7, reducing the possibility of natural condensation of the flue gas after it exits the flue 7, which could lead to pipe blockage.

[0023] In this embodiment, a hexagonal head 105 is fixedly connected to the middle position of the outer end of the sealing plate 104. The primary particulate filter 1 can be easily tightened and fixed to the bottom end of the sampling tube 2 by using the hexagonal head 105 in conjunction with a wrench.

[0024] In this embodiment, the primary particulate filter 1 further includes: an inner tube 106; an axial air outlet 1031 is provided at the middle of the outer end of the external threaded connector 103; a plurality of radial air inlets 1032 are uniformly provided on the side wall of the external threaded connector 103; the plurality of radial air inlets 1032 are respectively connected to the axial air outlet 1031 and the inner cavity of the metal powder filter tube 101; the two ends of the inner tube 106 are respectively fixedly connected to the end of the external threaded connector 103 facing the sealing plate 104; the outer wall of the inner tube 106 has a gap with the inner wall of the metal powder filter tube 101; and the axial air outlet 1031 and the plurality of radial air inlets 1032 are not connected to the inner cavity of the inner tube 106; the inner tube 106 can reduce the inner volume of the metal powder filter tube 101 and improve the gas response time.

[0025] In this embodiment, the sampling tube 2 includes: a stainless steel tube 201, an external threaded connector 202, and an internal threaded connector 203. The two axial ends of the stainless steel tube 201 are respectively fixedly connected to the external threaded connector 202 and the internal threaded connector 203. Both the external threaded connector 202 and the internal threaded connector 203 are connected to the inner cavity of the stainless steel tube 201. The internal threaded connector 203 is threaded onto the external threaded connector 103, and the axial air outlet 1031 is connected to the inner cavity of the stainless steel tube 201.

[0026] In this embodiment, the ammonia filter 3 includes: a stainless steel pipe 301, a flange 302, a flange 303, a threaded connector 304, and ammonia filter zeolite 305. The inner cavity of the stainless steel pipe 301 is filled with ammonia filter zeolite 305. The flange 302 is coaxially sleeved and fixed to the outer wall of one end of the stainless steel pipe 301. One end of the flange 303 is coaxially fixed to the other end of the stainless steel pipe 301. An axial vent hole 3031 communicating with the inner cavity of the stainless steel pipe 301 is opened in the middle of the flange 303. The other end of 03 is coaxially fixedly connected to an internal threaded connector 304, which is connected to the axial vent 3031. An external threaded connector 202 is threadedly connected to the internal threaded connector 304. A flange 203 is coaxially fixedly installed on the outer axial end of the flange pipe 5. A flange sealing gasket 6 is provided between the flange 203 and the flange pipe 5. The flange sealing gasket 6 is an asbestos-free gasket or a metal graphite spiral wound gasket. Ammonia in the flue gas is filtered by the ammonia filter 3 to reduce ammonia salt crystallization blockage and reduce ammonia interference measurement problems.

[0027] In this embodiment, the ammonia filtration sampling device further includes: a backflush pipe 8, and one or more radially arranged backflush holes are opened on the flange 2 303. One end of the backflush hole is connected to the outside, and the other end is connected to the axial ventilation hole 3031. The backflush pipe 8 is inserted into the backflush hole; the backflush pipe 8 is used to periodically purge the primary particulate filter 1 from the inside to the outside.

[0028] In this embodiment, the secondary particulate filter 4 includes: a housing 401, a flange 402, a cover 403, a filter element 404, and an air outlet 405. The housing 401 is a cylindrical structure that runs vertically through the housing. The bottom end of the housing 401 is fixed and connected to the flange 402. The flange 402 is coaxially and fixedly connected to the flange 302. A flange sealing gasket 6 is provided between the connection between the flange 402 and the flange 302. The flange sealing gasket 6 is an asbestos-free gasket or a metal-graphite spiral wound gasket. The cover 403 is fixedly installed at the top of the housing 401. The filter element 404 is fixedly connected to the middle of the bottom end of the cover 403. The filter element 404 is a ceramic filter element. The filter element 404 is hollow inside, closed at the bottom, and open at the top. The filter element 404 is movably disposed in the inner cavity of the housing 401. The cover 403 has an exhaust port inside. The exhaust channel 4031 has one end connected to the hollow inner cavity of the filter element 404. An exhaust nozzle 405 is fixedly installed on the side wall of the housing 403, and the other end of the exhaust channel 4031 is connected to the exhaust nozzle 405. The secondary particulate filter 4 also includes an electric heater 409 and a temperature sensor 410. The electric heater 409 and the temperature sensor 410 are respectively fixedly connected to the outer wall of the housing 401. The electric heater 409 is electrically connected to a temperature control device and a power supply, and the temperature sensor 410 is electrically connected to the temperature control device. The secondary particulate filter 4 has a heating function. The electric heater 409 heats the housing 401 to 220°C and, together with the filter element 404 with a filtration accuracy of 1 micron, further removes fine particulate matter, ensuring the normal operation of the sampling and analysis equipment.

[0029] In this embodiment, the secondary particulate filter 4 further includes: a housing 406, a cover 407, and fasteners 408. The housing 406 is a hollow cuboid structure with openings at the top and right side. The cover 407 is an L-shaped plate structure. Two fasteners 408 are provided. The left side of the top end and the lower side of the right end of the cover 407 are respectively detachably fixed to the left side of the top end and the right side of the bottom end of the housing 406 by two fasteners. The cover 407 can completely close the openings at the top and right side of the housing 406. A round hole is provided at the bottom end of the housing 406. The housing 401 slides through the round hole. The bottom end of the housing 406 is fixedly installed at the top of the flange 3 402. The housing 406 and the cover 407 can protect the internal structure of the secondary particulate filter 4 and have a certain heat insulation effect, preventing heat loss.

[0030] Working principle: When flue gas sampling and analysis is required, the inlet pipe of the CEMS system is connected to the outlet 405, and the CEMS system is started. The flue gas in flue 7 enters the CEMS system sequentially through the primary particulate filter 1, sampling pipe 2, ammonia filter 3, and secondary particulate filter. During this process, the primary particulate filter 1 filters most of the particulate matter in flue 7, reducing the possibility of natural condensation after the flue gas exits the flue and causing pipe blockage. Then, it passes through the ammonia filter 3 to filter the ammonia in the flue gas, reducing ammonia salt crystallization blockage and reducing ammonia interference in measurement. The flue gas after ammonia filtration then passes through the secondary particulate filter 4, which is heated to 220°C and has a filtration accuracy of 1 micron, further removing fine particulate matter and ensuring the normal operation of the sampling and analysis equipment in the CEMS system.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present utility model's technical solution and based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. An ammonia filtration sampling device, characterized in that, include: The system includes a primary particulate filter (1), a sampling tube (2), an ammonia filter (3), a secondary particulate filter (4), a flange tube (5), and a flue (7). One end of the flange tube (5) vertically penetrates the top wall of the flue (7) and extends into its interior. The flange tube (5) is fixedly connected to the top of the flue (7). The primary particulate filter (1) is installed inside the flue (7). One end of the primary particulate filter (1) is connected to one end of the sampling tube (2). The sampling tube (2) is movably inserted into the flange tube (5). The other end of the sampling tube (2) is connected to the ammonia filter (3). One end of the ammonia filter (3) is fixedly installed at the other end of the flange tube (5). The other end of the ammonia filter (3) is connected to the secondary particulate filter (4).

2. The ammonia filtration sampling device according to claim 1, characterized in that: The primary particulate filter (1) includes: a metal powder filter tube (101), an end ring (102), an external threaded connector (103), and a sealing plate (104). The metal powder filter tube (101) is made of 316L stainless steel powder sintering. The metal powder filter tube (101) is cylindrical. One end of the metal powder filter tube (101) is coaxially fixedly connected to the external threaded connector (103) through the end ring (102). The other end of the metal powder filter tube (101) is sealed and fixedly connected to the sealing plate (104). The external threaded connector (103) is connected to the inner cavity of the metal powder filter tube (101).

3. The ammonia filtration sampling device according to claim 2, characterized in that: A hexagonal head (105) is fixedly connected to the middle position of the outer end of the sealing plate (104).

4. The ammonia filtration sampling device according to claim 2, characterized in that: The primary particulate filter (1) further includes: an inner tube (106), an axial air outlet channel (1031) is provided at the middle of the outer end of the external threaded connector (103), and a plurality of radial air inlets (1032) are uniformly provided on the side wall of the external threaded connector (103). The plurality of radial air inlets (1032) are respectively connected to the axial air outlet channel (1031) and the inner cavity of the metal powder filter tube (101); the two ends of the inner tube (106) are respectively fixedly connected to the opposite end of the external threaded connector (103) and the sealing plate (104). The outer wall of the inner tube (106) has a gap with the inner wall of the metal powder filter tube (101), and the axial air outlet channel (1031) and the plurality of radial air inlets (1032) are not connected to the inner cavity of the inner tube (106).

5. An ammonia filtration sampling device according to claim 2, characterized in that: The sampling tube (2) includes: a stainless steel tube (201), an external threaded connector (202), and an internal threaded connector (203). The two ends of the stainless steel tube (201) are respectively fixedly connected to the external threaded connector (202) and the internal threaded connector (203). The external threaded connector (202) and the internal threaded connector (203) are both connected to the inner cavity of the stainless steel tube (201). The internal threaded connector (203) is threaded onto the external threaded connector (103), and the axial air outlet (1031) is connected to the inner cavity of the stainless steel tube (201).

6. An ammonia filtration sampling device according to claim 5, characterized in that: The ammonia filter (3) includes: a second stainless steel pipe (301), a first flange (302), a second flange (303), a second internal threaded connector (304), and ammonia filter zeolite (305). The inner cavity of the second stainless steel pipe (301) is filled with ammonia filter zeolite (305). The first flange (302) is coaxially sleeved and fixed on the outer wall of one end of the second stainless steel pipe (301). One end of the second flange (303) is coaxially fixed to the other end of the second stainless steel pipe (301). The second flange (303) has a joint in the middle that connects with the stainless steel pipe. The flange 2 (301) has an axial vent hole (3031) connected to the inner cavity of the flange 2 (303). The other end of the flange 2 (303) is coaxially fixedly connected to an internal threaded connector 2 (304). The internal threaded connector 2 (304) is connected to the axial vent hole (3031). The external threaded connector 2 (202) is threadedly connected to the internal threaded connector 2 (304). The flange 2 (303) is coaxially fixedly installed on the outer axial end of the flange tube (5). A flange sealing gasket (6) is provided between the flange 2 (303) and the flange tube (5).

7. An ammonia filtration sampling device according to claim 6, characterized in that: Also includes: Backflush pipe (8), the flange two (303) has one or more radially arranged backflush holes, one end of the backflush hole is connected to the outside, and the other end is connected to the axial vent hole (3031), and the backflush pipe (8) is inserted into the backflush hole.

8. An ammonia filtration sampling device according to claim 6, characterized in that: The secondary particulate filter (4) includes: a housing (401), a third flange (402), a cover (403), a filter element (404), and an air outlet (405). The housing (401) is a cylindrical structure that runs vertically through the interior. The bottom end of the housing (401) is fixed and connected to the third flange (402). The third flange (402) is coaxially fixedly connected to the first flange (302). A flange sealing gasket (6) is provided between the connection between the third flange (402) and the first flange (302). The top end of the housing (401) is sealed and fixedly installed with the cover (403). (403) A filter element (404) is fixedly connected to the middle of the bottom end. The filter element (404) is a ceramic filter element. The filter element (404) is hollow inside, closed at the bottom and open at the top. The filter element (404) is movably disposed in the inner cavity of the housing (401). An exhaust channel (4031) is provided inside the housing cover (403). One end of the exhaust channel (4031) is connected to the hollow inner cavity of the filter element (404). An air outlet (405) is fixedly installed on the side wall of the housing cover (403). The other end of the exhaust channel (4031) is connected to the air outlet (405).

9. An ammonia filtration sampling device according to claim 8, characterized in that: The secondary particulate filter (4) further includes: a housing (406), a cover (407), and fasteners (408). The housing (406) is a hollow cuboid structure with openings at the top and right side. The cover (407) is an L-shaped plate structure. There are two fasteners (408). The left side of the top end and the lower side of the right end of the cover (407) are respectively detachably fixed to the left side of the top end and the right side of the bottom end of the housing (406) by two fasteners. The cover (407) can completely close the openings at the top and right side of the housing (406). A round hole is opened at the bottom end of the housing (406). The housing (401) slides through the round hole of the cover. The bottom end of the housing (406) is fixedly installed at the top end of the flange (402).

10. An ammonia filtration sampling device according to claim 8, characterized in that: The secondary particulate filter (4) further includes an electric heater (409) and a temperature sensor (410), which are fixedly connected to the outer wall of the housing (401).

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