CN215448297U - Boiler flue gas pressure detection prevents stifled device - Google Patents

Abstract

The utility model relates to a boiler flue gas pressure detection anti-blocking device which comprises a boiler furnace or flue, a valve I, a valve II, an anti-blocking tank body, an anti-blocking tank cover body, a valve III, a valve IV and a pressure transmitter, wherein the boiler furnace or flue, the valve I, the valve II, the anti-blocking tank body, the anti-blocking tank cover body, the valve III, the valve IV and the pressure transmitter are sequentially connected, and a pore plate and a filter screen are further arranged inside the anti-blocking tank body. The utility model provides a flange-type detachable boiler flue gas pressure detection anti-blocking device, which effectively solves the problem that the conventional boiler flue gas pressure detection anti-blocking device can not be treated under the condition of no boiler shutdown because of serious blockage caused by fly ash, dust and other large solid particles carried in flue gas, can be widely applied to the whole operation process of a coal-fired boiler, and is particularly suitable for the whole operation process of a circulating fluidized bed boiler.

Description

Boiler flue gas pressure detection prevents stifled device

Technical Field

The utility model relates to a boiler flue gas pressure detection anti-blocking device.

Background

At present, a circulating fluidized bed boiler is widely applied to coal chemical production, fuel is combusted in a hearth in the form of boiler combustion, a large amount of coal ash enters a cyclone separator along with boiler flue gas through a flue, the separated flue gas is discharged into the atmosphere after desulfurization and denitrification treatment, and the coal ash enters the hearth for circulating combustion again. The pressure of the flue gas needs to be detected in the combustion process of the boiler, but the flue gas is often accompanied by fly ash, dust and other larger solid particles, so that the pressure transmitter is easily blocked, and the pressure detection is inaccurate, therefore, an anti-blocking device is arranged in front of most boiler flue gas pressure detection devices. Traditional anti-blocking device adopts the integral type structure, and the internal form is mostly the shutter type or labyrinth separation type, and its monolithic welding is on furnace equipment body.

Chinese patent CN203385510U provides a boiler flue wind pressure detects prevents stifled device, including preventing stifled sampler, first valve, second valve, third valve, pressure measurement device, gaseous blowback device and switch board, prevent the sample connection of stifled sampler insert in the flue, prevent that the export of stifled sampler is connected with the entry of first valve, the export of first valve is divided into two the tunnel, the second valve is crossed on one's road with pressure measurement device is connected, another road through the third valve with the export of gaseous blowback device is connected, the switch board with the control end of gaseous blowback device is connected. The device simple structure, when the flue appears blockking up, control gaseous blowback device through the switch board and carry out the blowback, solve the influence of pipeline jam to pressure measurement device testing result, nevertheless flying dust, dust etc. that carry in the flue gas do not filter, do not play substantive guard action to pressure measurement device, and when blockking up seriously, gaseous blowback effect is not very ideal.

Chinese patent CN203785832U discloses a boiler flue gas pressure sampling device, which comprises a sampling tube and a capacity expansion device, wherein the sampling tube is directly arranged on the wall of a hearth and is communicated with the hearth; the dilatation device sets up sampling tube upper portion, just pressure sample interface and the first interface that sweeps are installed on dilatation device upper portion, wherein, sweep the interface and use first end cap shutoff when normal work, still be provided with the second on the sampling tube and sweep the mouth, the second sweeps the mouth and uses the second end cap shutoff when normal work. When the sampling tube was stopped up, extract the second end cap, at first let in compressed air in sampling tube department, if compressed air can't be cleared up, can stretch into the metal rod and clear away the back rethread compressed air with the dust in the sampling tube, further clear up. The device removes dust in the sampling tube by compressed air back flushing and the anti-blocking rod going deep into the sampling tube, but a filter device is not arranged in front of the smoke pressure sampling interface, so that the sampling interface is blocked to different degrees in the pressure sampling process, and the service life of the pressure detection device is further influenced; and when the metal rod is deeply inserted into the sampling tube to clean dust, the visual range is small, and the cleaning effect cannot be determined.

Through to prior art analysis, discover that in the actual operation process, the stifled device of preventing of boiler flue gas pressure detection takes place to block up and then usually adopts compressed air to carry out the blowback clearance, or goes deep into the pipeline with the metal rod and dredge, often appear blocking up the serious condition that the clearance effect is not ideal. If the compressed air can not blow out the blockage, the pressure detection anti-blocking device can only be cut off from the root of the sampling pipe, but the scheme needs to be implemented when the boiler is shut down, and the normal operation of the boiler is influenced.

Disclosure of Invention

In order to solve the problems, the utility model provides a flange connection type detachable pressure detection anti-blocking device, a built-in pore plate and a built-in filter screen can be customized according to the actual working condition, the blocking situation is reduced, and when the blockage occurs and the back-blowing cleaning cannot be carried out, the blockage can be safely removed from a production system, so that the safe blockage cleaning is realized.

The technical scheme of the utility model is that: a boiler flue gas pressure detection anti-blocking device comprises a boiler furnace or flue, a valve I, a valve II, an anti-blocking tank body, an anti-blocking tank cover body, a valve III, a valve IV and a pressure transmitter which are connected in sequence; the boiler furnace or the flue is connected with a valve I through a pipeline I, and when the pipeline I is blocked, the valve I can be opened to clean the pipeline I; the pipeline I is welded with the pipeline II, and a valve II is arranged between the pipeline II and the anti-blocking tank body and is connected with the anti-blocking tank body through a flange; the filter screen is arranged in the anti-blocking tank body, and the edge of the filter screen is tightly pressed between the anti-blocking tank body and the anti-blocking tank cover body through the flange, so that the anti-blocking tank is convenient to disassemble, assemble, replace and clean; the anti-blocking tank body is internally provided with a pore plate which is fixed on the inner wall of the anti-blocking tank body through a supporting groove; a pipeline IV is arranged at the upper part of the anti-blocking tank cover body, a valve IV is arranged on the pipeline IV, and when the anti-blocking device is slightly blocked, inert gas can be connected through the valve IV to perform back flushing on the anti-blocking device; the pipeline IV is also provided with a bypass, and a valve III is arranged on the bypass and connected with a pressure transmitter.

The boiler flue gas pressure detection anti-blocking device is characterized in that the central axes of the anti-blocking tank body and the anti-blocking tank cover body are perpendicular to the horizontal plane.

The boiler flue gas pressure detection anti-blocking device has the advantages that the height of the anti-blocking tank body is 300-1000mm, and the diameter of the anti-blocking tank body is 65-200 mm.

The boiler flue gas pressure detection anti-blocking device is characterized in that the thickness of the pore plate is 1.5-8.0mm, and the axial included angle between the pore plate and the anti-blocking tank body is 30-45 degrees.

The boiler flue gas pressure detection anti-blocking device is characterized in that a plurality of uniformly distributed round holes are formed in a hole plate, the diameter of each round hole is 3-10mm, and the round holes can filter large solid particles except fly ash and dust in boiler flue gas.

The boiler flue gas pressure detection anti-blocking device is characterized in that the filter screen is a conical filter screen, the cone angle is 45-120 degrees, and the cone angle is vertically downward.

Boiler flue gas pressure measurement prevent stifled device, the filter screen passes through flange joint, can change and clear up, the mesh number of filter screen can be selected according to the operating condition of boiler.

The pressure-bearing range of the anti-blocking device for detecting the pressure of the flue gas of the boiler is-0.3-0.3 MPa.

The utility model has the beneficial effects that: (1) the size of the pore plate can be customized according to the actual working condition, larger solid particles in the boiler flue gas can be filtered, and the cleaning frequency of the filter screen is reduced. (2) The utility model adopts flange connection, and is convenient to disassemble, clean and maintain. (3) The utility model has good filtering effect and avoids inaccurate data measurement caused by blockage of the pressure transmitter, thereby ensuring the normal operation of the boiler. (4) According to the utility model, different positions and different degrees of blockage of the anti-blocking device are detected according to the pressure of the flue gas of the boiler, different cleaning modes can be adopted, slight blockage can be swept by connecting inert gas, and the anti-blocking device can be detached and cleaned while normal production is not influenced when the blockage is serious.

Drawings

FIG. 1 is a schematic view of the anti-clogging tank apparatus of the present invention.

FIG. 1, 1-boiler furnace or flue, 2-pipeline I, 3-valve I, 4-pipeline II, 5-valve II, 6-supporting groove, 7-anti-blocking tank body, 8-flange, 9-anti-blocking tank cover body, 10-pipeline III, 11-pressure transmitter, 12-valve III, 13-valve IV, 14-pipeline IV, 15-filter screen, 16-orifice plate.

Detailed Description

Referring to the attached drawing 1, the embodiment comprises a boiler furnace or flue 1, a valve I3, a valve II 5, an anti-blocking tank body 7, an anti-blocking tank cover body 9, a valve III 12, a valve IV 13 and a pressure transmitter 11 which are connected in sequence; a boiler hearth or flue 1 is connected with a valve I3 through a pipeline I2; the pipeline I2 is welded with the pipeline II 4, and a valve II 5 is arranged between the pipeline II 4 and the anti-blocking tank body 7 and is connected through a flange; a filter screen 15 is arranged in the anti-blocking tank body 7, and the edge of the filter screen 15 is tightly pressed between the anti-blocking tank body 7 and the anti-blocking tank cover body 9 through a flange; the anti-blocking tank body 7 is also internally provided with a pore plate 16, and the pore plate 16 is fixed on the inner wall of the anti-blocking tank body 7 through the supporting groove 6; a pipeline IV 14 is arranged at the upper part of the anti-blocking tank cover body 9, and a valve IV 13 is arranged on the pipeline IV 14; and a bypass is also arranged on the pipeline IV 14, and a valve III 12 is arranged on the bypass and is connected with the pressure transmitter 11.

The other embodiment is different in that the central axes of the anti-blocking tank body and the anti-blocking tank cover are vertical to the horizontal plane.

Another embodiment is different in that the height of the anti-blocking tank body is 300 mm.

Another embodiment is different in that the height of the anti-blocking tank body is 700 mm.

The difference of another embodiment is that the height of the anti-blocking tank body is 1000 mm.

Another embodiment differs in that the diameter of the anti-clogging tank body is 65 mm.

Another embodiment differs in that the diameter of the anti-clogging can body is 130 mm.

Another embodiment is different in that the diameter of the anti-blocking tank body is 200 mm.

Another embodiment is different in that the axial included angle between the pore plate and the anti-blocking tank body is 30 degrees.

Another embodiment is different in that the axial included angle between the pore plate and the anti-blocking tank body is 40 degrees.

Another embodiment is different in that the axial included angle between the pore plate and the anti-blocking tank body is 45 degrees.

Another embodiment differs in that the aperture plate is 1.5mm thick.

Another embodiment differs in that the aperture plate is 4.5mm thick.

Another embodiment differs in that the aperture plate is 8.0mm thick.

The difference of another embodiment is that a plurality of through holes which are uniformly distributed are arranged on the pore plate, and the diameter of each circular hole is 3 mm.

Another embodiment differs in that the diameter of the circular hole in the orifice plate is 7 mm.

Another embodiment differs in that the diameter of the circular hole in the orifice plate is 10 mm.

The difference of another embodiment is that the filter screen is a cone-shaped filter screen, and the cone angle is vertical downwards.

Another embodiment differs in that the cone angle of the filter screen is 45.

Another embodiment differs in that the cone angle of the filter screen is 90.

Another embodiment differs in that the cone angle of the filter screen is 120.

Another embodiment is different in that the anti-blocking device can bear pressure of-0.3 MPa.

The other embodiment is different in that the anti-blocking device can bear the pressure of 0 MPa.

Another embodiment is different in that the anti-blocking device can bear 0.3MPa of pressure.

The following is the working flow and principle of the utility model.

During boiler combustion, fly ash, dust and other large solid particles in the boiler flow along with flue gas, enter the pipeline I2 and the pipeline II 4, enter the anti-blocking tank body 7 through the valve II 5, the large solid particles in the flue gas are intercepted by the pore plate 16, the fly ash and the dust can be filtered through the filter screen 15, and the flue gas enters the pressure transmitter 11 through the pipeline IV 14, the valve III 12 and the pipeline III 10 to measure pressure. When the anti-blocking device is slightly blocked, the valve IV 13 can be connected with an inert gas pipeline to carry out back flushing on the anti-blocking device; when the pore plate or the filter screen is seriously blocked, the valve II 5 can be closed, the anti-blocking device is disassembled from the flange, and the pore plate or the filter screen is cleaned, so that the problem that the conventional boiler flue gas pressure detection anti-blocking device is seriously blocked and cannot be treated under the condition of not stopping the boiler is thoroughly solved.

Claims (10)

1. A boiler flue gas pressure detection anti-blocking device is characterized by comprising a boiler furnace or flue, a valve I, a valve II, an anti-blocking tank body, an anti-blocking tank cover body, a valve III, a valve IV and a pressure transmitter which are sequentially connected; the boiler furnace or the flue is connected with a valve I through a pipeline I; the pipeline I is welded with the pipeline II, and a valve II is arranged between the pipeline II and the anti-blocking tank body and is connected with the anti-blocking tank body through a flange; a filter screen is arranged in the anti-blocking tank body, and the edge of the filter screen is tightly pressed between the anti-blocking tank body and the anti-blocking tank cover body through a flange; the anti-blocking tank body is internally provided with a pore plate which is fixed on the inner wall of the anti-blocking tank body through a supporting groove; a pipeline IV is arranged at the upper part of the anti-blocking tank cover body, and a valve IV is arranged on the pipeline IV; the pipeline IV is also provided with a bypass, and a valve III is arranged on the bypass and connected with a pressure transmitter.

2. The boiler flue gas pressure detecting and anti-blocking device according to claim 1, wherein the central axes of the anti-blocking tank body and the anti-blocking tank cover are perpendicular to the horizontal plane.

3. The boiler flue gas pressure detecting and anti-blocking device as claimed in claim 2, wherein the height of the anti-blocking tank body is 300-1000 mm.

4. The boiler flue gas pressure detecting and anti-blocking device according to claim 3, wherein the diameter of the anti-blocking tank body is 65-200 mm.

5. The boiler flue gas pressure detecting and anti-blocking device according to claim 1, wherein an axial included angle between the pore plate and the anti-blocking tank body is 30-45 °.

6. The boiler flue gas pressure detecting and anti-blocking device according to claim 5, wherein the thickness of the orifice plate is 1.5-8.0 mm.

7. The boiler flue gas pressure detection anti-blocking device according to claim 6, wherein a plurality of uniformly distributed round holes are arranged on the orifice plate, and the diameter of the round holes is 3-10 mm.

8. The boiler flue gas pressure detecting and anti-blocking device according to claim 1, wherein the filter screen is a cone-shaped filter screen, and the cone angle is vertically downward.

9. The boiler flue gas pressure detecting and anti-blocking device according to claim 8, wherein the filter screen has a cone angle of 45 ° to 120 °.

10. The boiler flue gas pressure detecting and anti-blocking device according to claim 1, wherein the pressure-bearing range of the anti-blocking device is-0.3-0.3 MPa.

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