CN115738706A

CN115738706A - Nitrogen oxide purifier for coal-fired boiler

Info

Publication number: CN115738706A
Application number: CN202211388393.9A
Authority: CN
Inventors: 吴敬涛; 董兴夙
Original assignee: Jilin Tongxin Thermal Group Co ltd
Current assignee: Jilin Tongxin Thermal Group Co ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-03-07

Abstract

The invention relates to a purification device, in particular to a nitrogen oxide purification device for a coal-fired boiler. The invention provides a nitrogen oxide purification device for a coal-fired boiler, which is used for detecting the concentration of nitrogen oxide. The utility model provides a nitrogen oxide purifier for coal fired boiler, is including purifying frame, fan, controller, splice frame and exhaust subassembly etc. purifies frame lower part bilateral symmetry and installs the fan to connect coal fired boiler pumping flue gas, purify frame lower part front side and install the controller, the controller links to each other with the fan electrical property, purifies frame top intercommunication and has the splice frame, and splice frame bottom right side is equipped with the exhaust subassembly that is used for discharging to purify the back gas. The concentration of nitrogen oxide in the gas after purifying is detected through the nitrogen oxide sensor, and after the concentration is high, the gas is pumped back to the purification frame through the pumping pump to be purified again, so that the quality of the flue gas purification is ensured.

Description

Nitrogen oxide purifier for coal-fired boiler

Technical Field

The invention relates to a purification device, in particular to a nitrogen oxide purification device for a coal-fired boiler.

Background

Coal is used as a main energy source, sulfur, chlorine and nitrogen oxides generated in the combustion process of the coal are main pollution sources of air pollution, an industrial boiler is a main emission source of the nitrogen oxides, and in order to avoid environmental pollution, the nitrogen oxides need to be purified before smoke generated by a coal-fired boiler is discharged.

The publication number is CN 203944292U's a denitrification facility, it includes ammonia storage tank, denitration reactor, air heater and afterbody flue, the ammonia storage tank pass through the ammonia pump and be connected with denitration reactor, air heater respectively with denitration reactor and afterbody flue connection, denitration reactor and afterbody flue between be equipped with middle flue, denitration reactor in be equipped with first reaction chamber, second reaction chamber and third reaction chamber.

The above patents suffer from the following disadvantages: above-mentioned patent is equipped with two-layer catalyst in the denitration reactor, ammonia and flue gas get into the reaction chamber, ammonia takes place to react with the nitrogen oxide in the flue gas and generates nitrogen gas and water under the effect of catalyst, can deposit one deck carbonaceous compound because of the catalyst in the use on the surface, the effective usable surface area of catalyst has been reduced, influence nitrogen oxide neutralization effect, whether continue to use under the condition that does not examine the catalyst and block up, will lead to gaseous interior nitrogen oxide not to be purified completely, although above-mentioned patent is provided with catalytic reaction device at the back and purifies gaseous once more, but catalytic reaction device also has blocking phenomenon, if do not carry out the detection of nitrogen oxide concentration between gas outgoing, will pollute the environment.

In order to solve the problem that the nitrogen oxide detection of the gas to be exhausted does not cause environmental pollution, the nitrogen oxide purification device for the coal-fired boiler is required to be designed for detecting the concentration of the nitrogen oxide.

Disclosure of Invention

In order to overcome the defect that the existing denitration device does not detect the oxynitride of the gas to be discharged so as to cause environmental pollution, the invention provides the oxynitride purification device for the coal-fired boiler, which is used for detecting the concentration of the oxynitride.

The technical scheme of the invention is as follows: the utility model provides a nitrogen oxide purifier for coal fired boiler, including purifying the frame, the fan, a controller, the connection frame, the exhaust subassembly, preliminary filter, catalyst converter and secondary filter, purify the frame lower part bilateral symmetry and install the fan, the fan is used for sending into the flue gas and purifies the frame, purify frame lower part front side and install the controller, the controller links to each other with the fan electrical property, it has the connection frame to purify frame top intercommunication, connection frame bottom right side is equipped with the exhaust subassembly that is used for discharging the gas after purifying, purify the frame in the lower part install the preliminary filter that is used for filtering dust in the flue gas, purify frame in the upper portion and install the catalyst converter, the middle secondary filter that is used for the flue gas after the secondary filtration purification of installing in the connection frame, still including ammonia ejection mechanism and gas mixing mechanism, be equipped with ammonia ejection mechanism and gas mixing mechanism on the purification frame, ejection mechanism is used for mixing ammonia in the purification frame with the flue gas with the ammonia, and detect ammonia concentration in the gas after purifying, mixing mechanism is used for mixing ammonia and flue gas, ammonia ejection mechanism is including ammonia sensor and siren, install the nitrogen oxide sensor that is used for detecting the nitrogen oxide in the gas after purifying, the alarm subassembly, the alarm side installs the nitrogen oxide sensor and alarm and all through the detection control in the alarm control personnel high concentration behind the nitrogen oxide sensor of alarm, the alarm control in the alarm.

In one embodiment, the exhaust assembly comprises a communicating pipe, a rotating pipe, a connecting pipe and a chimney, the communicating pipe is communicated with the right side of the bottom of the connecting frame, the rotating pipe is rotatably communicated with the lower end of the communicating pipe so as to facilitate gas flowing, the connecting pipe is rotatably communicated with the lower end of the rotating pipe, the chimney used for exhausting purified gas is arranged on the right side of the purifying frame, and the connecting pipe is communicated with the chimney.

In one of them embodiment, the ammonia spouts puts the mechanism including the gas injection frame, the aspiration pump, collect the frame, crisscross liquid frame of receiving, back flow and pumping pump, the gas injection frame is installed to the position that is located preliminary filter upside in the purification frame, the aspiration pump is installed on gas injection frame right side, so that spout in sending ammonia to the gas injection frame through the aspiration pump and mix with the flue gas, the aspiration pump links to each other with the controller electrical property, the position that is located the catalyst converter below in the purification frame is fixed with crisscross liquid frame of receiving, crisscross liquid frame right side of receiving is connected with collects the frame, it has the back flow to purify between frame and the communicating pipe intercommunication, install the pumping pump on the back flow, will purify unqualified gas through the back flow and take out secondary purification in the purification frame, smoke purification quality is improved.

In one embodiment, the air mixing mechanism comprises a servo motor, wind wheels, a flat belt, belt pulleys and a wind guide frame, wherein the servo motor is installed on the left side of the upper portion of the purification frame, the servo motor is electrically connected with the controller, the wind guide frame is fixed in the middle of the purification frame, air outlets are uniformly formed in the front side and the rear side of the wind guide frame, smoke can be conveniently discharged upwards, the wind wheels are symmetrically and rotatably arranged in the front and the rear side of the wind guide frame in a front-and-rear symmetrical mode, the two wind wheels are rotatably connected with the purification frame, an output shaft of the servo motor is connected with the wind wheels on the rear side, the belt pulleys are fixed on the left sides of the two wind wheels, the flat belt pulleys are sleeved on the two belt pulleys, the wind wheels are rotated by taking the servo motor as a power source, ammonia gas and the smoke are fully mixed, and then purified in the next step.

In one embodiment, the device also comprises a replacing mechanism which comprises an electric sliding rail, an electric sliding block, a sealing block, a one-way valve, a moving frame, an extrusion spring, an exhaust pipe, an exhaust pump, a gear ring, a closing plate and a straight gear, wherein the electric sliding rail is symmetrically arranged at the front and the back of the left side in the connecting frame and is electrically connected with a controller, the electric sliding block is arranged between the two electric sliding rails in a sliding way, the sealing block is fixed on the electric sliding block and is connected with the inside of the connecting frame in a sliding way, after the sealing block moves towards the right side and crosses the purifying frame, the inner space of the connecting frame can be separated from the left and the right sides, so that the gas exhausted from the purifying frame can not be exhausted into the connecting pipe, the one-way valve is arranged at the right side of the top of the connecting frame, the external air can enter the inside of the connecting frame through the one-way valve, and the gas in the connecting frame can not be exhausted through the one-way valve, middle slidingtype is equipped with the removal frame in the connection frame, be connected with the extrusion spring between removal frame and the connection frame, connection frame right side intercommunication has the blast pipe, the blast pipe lower extreme communicates with each other with communicating pipe, install the air pump on the blast pipe, the air pump links to each other with the controller electrical property, can be with inside remaining gas pumping of connection frame to communicating pipe through the air pump, the upper end rotary type is equipped with the ring gear in the communicating pipe, upper portion is equipped with five closure plates along the even rotary type of circumference in the communicating pipe, the closure plate top all is fixed with the straight-toothed gear, the straight-toothed gear all meshes with the ring gear, it links to each other with the ring gear slidingtype to remove the frame with the pushing, so that remove the frame promotion ring gear rotation, and then make five closure plates rotation closure sealed through the straight-toothed gear, with communicating pipe, block gas and block up communicating pipe.

In one embodiment, the air outlet device further comprises an ejection mechanism, the ejection mechanism comprises an ejection frame, a compression spring, a wedge-shaped ejection frame, an air outlet barrel and a reset spring, the ejection frame is symmetrically arranged in the connection frame in a front-back sliding mode on the right side, the two ejection frames are connected with the secondary filter plate in a clamping mode, the compression spring is connected between the ejection frame and the inside of the connection frame, the air outlet barrel is communicated with the right side of the top of the connection frame, the wedge-shaped ejection frame is arranged on the right side of the top of the connection frame in a sliding mode, the wedge-shaped ejection frame is connected with the air outlet barrel in a sliding mode, the reset spring is connected between the wedge-shaped ejection frame and the inside of the air outlet barrel, and the two ejection frames are clamped by the wedge-shaped ejection frame.

In one of them embodiment, still including rotatory mechanism that sprays, rotatory mechanism that sprays is including the water tank, the frame is spouted in the atomizing, driven gear, driving motor, driving gear and fan, the communicating pipe outside is fixed with the water tank that is used for saving waste gas deodorant, it spouts the frame to be fixed with the atomizing on the rotating tube, the atomizing spouts the frame and links to each other with the water tank rotary type, the rotating tube outside is fixed with driven gear, driving motor is installed to the connecting pipe front side, be connected with the driving gear on the driving motor output shaft, driving gear and driven gear meshing, the frame can be rotated and spray on waste gas deodorant is at the intraductal gas of rotating to the atomizing, the frame inboard is fixed with the fan is spouted in the atomizing, the frame is spouted in the atomizing, driving motor and fan all link to each other with the controller electrical property.

In one embodiment, the gas storage device further comprises an inclined frame and a baffle, the lower part of the connecting pipe is communicated with the inclined frame used for storing gas and containing liquid, and the baffle used for blocking the liquid is fixed at the position, located on the right side of the inclined frame, in the connecting pipe.

The invention has the following advantages: 1. the concentration of nitrogen oxide in the purified gas is detected by a nitrogen oxide sensor, and after the concentration is high, the gas is pumped back into the purification frame by a pumping pump for purification again, so that the purification quality of the flue gas is ensured;

2. stirring the flue gas and the ammonia gas through the rotation of a wind wheel, and mixing the flue gas and the ammonia gas to ensure that the ammonia gas reacts with oxynitride through a catalyst to produce nitrogen and water, thereby achieving the purpose of neutralization;

3. ammonia and oxynitride generated and water flow onto the staggered liquid collecting rack, and gas cannot be blocked by the staggered liquid collecting rack, so that water is conveniently collected and discharged;

3. the secondary filter plate can be replaced in the process of purifying the flue gas through the matching of the replacing mechanism and the ejecting mechanism, and the purification of the flue gas in the purification frame is not influenced;

4. the exhaust gas deodorant is uniformly sprayed and mixed with the purified gas through the atomizing spray frame, and the gas can be deodorized.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic view of a first partially cut-away perspective structure of the present invention.

Fig. 3 is a schematic partial sectional perspective view of a second embodiment of the present invention.

Fig. 4 is a schematic perspective view of the ammonia gas discharge mechanism of the present invention.

FIG. 5 is a schematic perspective view of a part of the ammonia gas blowing mechanism of the present invention.

Fig. 6 is a schematic perspective view of the air mixing mechanism of the present invention.

Fig. 7 is a schematic partial sectional perspective view of the air mixing mechanism of the present invention.

Fig. 8 is a schematic perspective view of a first replacement mechanism according to the present invention.

Fig. 9 is a schematic perspective view of a second replacement mechanism according to the present invention.

Fig. 10 is a partial perspective view of the exchange mechanism of the present invention.

Fig. 11 is a state diagram of the use of the exchange mechanism of the present invention.

Fig. 12 is a schematic perspective view of the eject mechanism of the present invention.

Fig. 13 is a partially cut-away perspective view of the eject mechanism of the present invention.

Fig. 14 is a partially sectional perspective structural schematic view of the rotary spraying mechanism of the present invention.

Fig. 15 is an exploded view of the rotary spray mechanism of the present invention.

Fig. 16 is a schematic perspective view of the bezel and the baffle of the present invention.

In the reference symbols: 1-purification frame, 2-fan, 201-controller, 3-connection frame, 4-connection pipe, 5-rotation pipe, 6-connection pipe, 7-chimney, 8-primary filter plate, 9-catalyst, 10-secondary filter plate, 11-ammonia gas spraying mechanism, 111-gas spraying frame, 112-air pump, 113-collection frame, 114-staggered liquid receiving frame, 115-nitrogen oxide sensor, 116-return pipe, 117-pumping pump, 118-alarm, 12-gas mixing mechanism, 121-servo motor, 122-wind wheel, 123-flat belt, 124-belt pulley, 125-air guiding frame, 13-replacement mechanism, 131-electric slide rail, 132-electric slide block, 133-sealing block, 134-one-way valve, 135-moving frame, 136-extrusion spring, 137-exhaust pipe, 138-exhaust pump, 139-toothed ring, 1310-closing plate, 1311-straight gear, 14-ejection mechanism, 141-ejection frame, 142-compression spring, 143-pushing frame, 144-wedge-pushing frame, 152-spray spring, 153-driven gear, 155-driven gear, 154-driven gear, and driving gear.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

A nitrogen oxide purification device for a coal-fired boiler is disclosed, as shown in figures 1-3, and comprises a purification frame 1, a fan 2, a controller 201, a connecting frame 3, an exhaust assembly, a primary filter plate 8, a catalyst 9, a secondary filter plate 10, an ammonia emission mechanism 11 and a gas mixing mechanism 12, wherein the fan 2 is symmetrically arranged on the lower portion of the purification frame 1 in a left-right mode so as to be connected with the smoke pumped by the coal-fired boiler, the controller 201 is arranged on the front side of the lower portion of the purification frame 1, the controller 201 is electrically connected with the fan 2, the top of the purification frame 1 is communicated with the connecting frame 3, the right side of the bottom of the connecting frame 3 is provided with the exhaust assembly for discharging purified gas, the primary filter plate 8 for filtering dust particles contained in the smoke is arranged on the lower portion in the purification frame 1, the catalyst 9 is arranged on the upper portion in the purification frame 1, the secondary filter plate 10 for secondarily filtering the purified smoke is arranged in the middle of the connecting frame 3, the purification frame 1 is provided with the ammonia emission mechanism 11 and the gas mixing mechanism 12 for discharging ammonia emission, the ammonia emission mechanism 11 and the ammonia to be capable of absorbing ammonia into the purification frame 1 to be mixed with the smoke, so as to react with the nitrogen oxide generated in the smoke under the effect of the catalyst 9, and to enable the ammonia emission to be fully detect the nitrogen oxide and the ammonia emission in the smoke, and the ammonia emission mechanism to enable the ammonia emission of the ammonia emission and the smoke to be mixed gas emission, and the ammonia emission mechanism to be capable of detecting the nitrogen oxide and the smoke through the emission, and the smoke by rotating the smoke and the smoke.

As shown in fig. 1-3, the exhaust assembly includes a communicating pipe 4, a rotating pipe 5, a connecting pipe 6 and a chimney 7, the communicating pipe 4 is connected to the right side of the bottom of the connecting frame 3, the rotating pipe 5 is connected to the lower end of the communicating pipe 4 in a rotating manner so as to facilitate the flow of gas, the connecting pipe 6 is connected to the lower end of the rotating pipe 5 in a rotating manner, the chimney 7 for discharging purified gas is arranged on the right side of the purifying frame 1, and the connecting pipe 6 is connected to the chimney 7.

As shown in fig. 1, 2, 4 and 5, the ammonia gas spraying and discharging mechanism 11 includes a gas spraying frame 111, a gas suction pump 112, a collection frame 113, a staggered liquid receiving frame 114, a nitrogen oxide sensor 115, a return pipe 116, a pumping pump 117 and an alarm 118, the gas spraying frame 111 for spraying ammonia gas and mixing flue gas is installed at the position on the upper side of the primary filter plate 8 in the purification frame 1, the gas suction pump 112 for pumping ammonia gas is installed at the right side of the gas spraying frame 111, the gas suction pump 112 is electrically connected with a controller 201, the staggered liquid receiving frame 114 is fixed at the position below the catalyst 9 in the purification frame 1, the collection frame 113 for collecting water is connected to the right side of the staggered liquid receiving frame 114, the staggered liquid receiving frame 114 is obliquely arranged in a left-high and right-low mode, the staggered liquid receiving frame 114 is composed of two rows of rectangular opening boxes, the two rows of the upper and lower opening boxes are staggered, flue gas is upward arranged through a gap, ammonia gas is downward generated on the liquid receiving frame 114 due to the action of the catalyst 9, the nitrogen oxide in the flue gas is installed in the embedded communication pipe 115 for detecting the concentration of nitrogen oxide in the nitrogen oxide sensor, the purification frame 118 is connected with the purification frame 118, the alarm 118, the purification frame 1, the alarm 118 is installed before the purification frame, and the alarm 118 for controlling the communication pipe 201.

As shown in fig. 2, 6 and 7, the air mixing mechanism 12 includes a servo motor 121, wind wheels 122, a flat belt 123, a belt pulley 124 and an air guide frame 125, the servo motor 121 is installed on the left side of the upper portion of the purification frame 1, the servo motor 121 is electrically connected with the controller 201, the air guide frame 125 is fixed in the middle of the purification frame 1, air outlets are uniformly formed in the front and rear sides of the air guide frame 125 so as to facilitate upward exhaust of flue gas, the wind wheels 122 for mixing ammonia gas and flue gas are symmetrically and rotatably installed in the air guide frame 125, the two wind wheels 122 are rotatably connected with the purification frame 1, an output shaft of the servo motor 121 is connected with the wind wheels 122 on the rear side, the belt pulley 124 is fixed on the left side of each of the two wind wheels 122, and the flat belt 123 is sleeved on the two belt pulleys 124.

When the device is used for purifying nitrogen oxides generated by coal combustion, the two fans 2 are connected with the exhaust port of the coal-fired boiler, then the fans 2 are opened through the controller 201, smoke generated by coal combustion of the coal-fired boiler is sucked into the purification frame 1 due to the work of the fans 2, and is subjected to primary filtration through the primary filter plate 8, dust and particles contained in the smoke can be filtered, at the moment, an ammonia tank is externally connected to the air suction pump 112, the air suction pump 112 is started through operating the controller 201, the air suction pump 112 pumps the ammonia into the air injection frame 111, the air injection frame 111 sprays the ammonia and mixes the smoke after primary filtration, meanwhile, the servo motor 121 can be started through the controller 201, the output shaft of the servo motor 121 rotates to drive the wind wheel 122 on the rear side to rotate, and then the wind wheel 122 on the front side is driven to rotate through the flat belt 123 and the belt pulley 124, the two wind wheels 122 stir the flue gas and the ammonia gas to fully mix the ammonia gas and the flue gas, the air guide frame 125 collects the flue gas and the ammonia gas below and mixes the flue gas and the ammonia gas, the flue gas and the ammonia gas are upwards discharged onto the staggered liquid receiving frame 114 through air outlets on the front side and the rear side of the air guide frame 125, the flue gas and the ammonia gas are upwards discharged onto the catalyst 9 through gaps of two rows of opening boxes on the staggered liquid receiving frame 114, the ammonia gas reacts with nitrogen oxides in the flue gas under the action of the catalyst 9 to generate nitrogen gas and water, the water can downwards drop on the staggered liquid receiving frame 114, the water can flow to the right side into the collecting frame 113 due to the inclined arrangement of the staggered liquid receiving frame 114 in a left-high and right-low mode, the water can be discharged through the collecting frame 113, the remaining gas and the nitrogen gas are continuously upwards discharged into the connecting frame 3, and then the dust and impurities remained in the gas are filtered through the secondary filter plate 10, the communicating pipe 4, the rotating pipe 5 and the connecting pipe 6 enter the chimney 7, and finally, the flue gas is discharged into the air from a chimney 7, so that the filtration and purification of the flue gas are completed, the nitrogen oxide can be better treated by a neutralization mode of reacting the injected ammonia gas with the nitrogen oxide in the flue gas, and no toxic gas is generated additionally in the neutralization process.

The nitrogen oxide sensor 115 can detect the gas flowing into the communicating pipe 4, because the catalyst 9 can deposit a layer of carbon-containing compound on the surface in the using process, the effective usable surface area of the catalyst 9 is reduced, pores of the catalyst 9 are blocked, the catalyst is used under the condition that the blockage of the catalyst 9 is not detected, the nitrogen oxide contained in the purified gas is not completely purified, after the nitrogen oxide sensor 115 detects that the concentration of the nitrogen oxide in the gas is greater than a preset value, the controller 201 can control the pumping pump 117 to work, and meanwhile, the alarm 118 sends out a section of alarm to warn a worker, the pumping pump 117 works to pump the gas in the communicating pipe 4 back into the purifying frame 1 through the return pipe 116, so that the gas is subjected to secondary purification, the pumping pump 117 is automatically closed after pumping back, if the secondarily purified gas passes through the nitrogen oxide sensor 115, the working of the coal-fired boiler needs to be suspended if the concentration of the secondarily purified gas is higher, the catalyst 9 is replaced, so as to continue to purify the flue gas, the quality of the gas is ensured, and finally, when the device is not required to be used, the device is closed, the filter plate 10 is also removed, and the catalytic filter plate is detached and can be used for a long time, and the catalytic filter plate can be used for ensuring the catalytic effect after being used.

Example 2

Based on the embodiment 1, as shown in fig. 1, fig. 2, fig. 8, fig. 9, fig. 10 and fig. 11, the device further includes a replacing mechanism 13, the replacing mechanism 13 includes an electric slide rail 131, an electric slide block 132, a sealing block 133, a check valve 134, a moving frame 135, an extrusion spring 136, an exhaust pipe 137, an exhaust pump 138, a gear ring 139, a closing plate 1310 and a spur gear 1311, the electric slide rail 131 is symmetrically installed at the front and back of the left side in the connecting frame 3, the electric slide rail 131 is electrically connected to the controller 201, the electric slide block 132 is slidably installed between the two electric slide rails 131, the sealing block 133 is fixed on the electric slide block 132, the sealing block 133 is slidably connected to the inside of the connecting frame 3, after the sealing block 133 moves to the right side to pass over the purifying frame 1, the inner space of the connecting frame 3 can be separated from the left and the right, the check valve 134 is arranged at the right side of the top of the connecting frame 3, the outside air can enter the connecting frame 3 through the check valve 134, and the inside gas of the connection frame 3 can't be discharged through the check valve 134, the middle sliding type is equipped with the moving frame 135 in the connection frame 3, be connected with the extrusion spring 136 between moving frame 135 and the connection frame 3, the sealed block 133 moves to the right side and can promote the moving frame 135, the connection frame 3 right side intercommunication has the blast pipe 137, the blast pipe 137 lower extreme communicates with each other with communicating pipe 4, install the exhaust pump 138 that is used for discharging the residual gas on the right side in the connection frame 3 on the blast pipe 137, the exhaust pump 138 electrically links to each other with the controller 201, the upper end rotary type is equipped with the ring gear 139 in the communicating pipe 4, the upper portion is equipped with five closure plates 1310 along the even rotary type of circumference in the communicating pipe 4, the closure plate 1310 top all is fixed with spur gear 1311, spur gear 1311 all meshes with ring gear 139, the moving frame 135 is connected with the ring gear 139 sliding type, five closure plates 1310 rotate each other and seal, can block communicating pipe 4, block gas from entering communicating pipe 4.

In the process of purifying nitrogen oxides in flue gas by the device, if the secondary filter plate 10 needs to be replaced, the controller 201 can control the electric slide rail 131 to drive the sealing block 133 to move towards the right side, after the sealing block 133 passes over the purification frame 1, the internal space of the connection frame 3 is separated from left to right, the gas in the purification frame 1 can not be discharged into the communication pipe 4, the sealing block 133 moves towards the right side and is also contacted with the moving frame 135, further the moving frame 135 is pushed to move towards the right side, the extrusion spring 136 is compressed, the moving frame 135 moves towards the right side to push the toothed ring 139 to rotate, the toothed ring 139 drives the spur gear 1311 and the closing plate 1310 to rotate, the five closing plates 1310 are mutually rotated and closed, further the communication pipe 4 is blocked, the right side in the connection frame 3 is positioned in a relatively closed space, at this time, the electric slide rail 131 is closed, then the exhaust pump 138 is opened through the controller 201, the exhaust pump 138 pumps the gas on the right side in the connection frame 3 into the communication pipe 4, meanwhile, the external air enters the connection frame 3 through the check valve 134 and is also pumped into the communication pipe 4 by the exhaust pump 138, after the gas left on the right side in the connection frame 3 is all discharged into the communication pipe 4, the exhaust pump 138 is closed, the electric slide rail 131 is controlled to continuously drive the electric slide block 132 to move towards the right side, the sealing block 133 continuously pushes the moving frame 135, the toothed ring 139 continuously rotates, the toothed part is disengaged from the spur gear 1311, the sealing block 133 continuously moves to extrude the air on the right side in the connection frame 3, further, the air enters the air outlet cylinder 144 to push the wedge-shaped pushing frame 143 to move towards the right side, the reset spring 145 is compressed, the compression spring 142 is in the initial state, after the wedge-shaped pushing frame 143 does not move and is not pop up to the clamping frame 141, the pop-up frame 141 drives the secondary filter plate 10 to pop up under the reset action of the compression spring 142, at this time, the electric slide rail 131 is closed through the controller 201, the secondary filter plate 10 is detached for cleaning, after the sealing block 133 does not extrude air on the right side in the connecting frame 3 any more, the wedge-shaped pushing frame 143 can move to the left side for resetting under the resetting action of the resetting spring 145, after the secondary filter plate 10 is cleaned, the wedge-shaped pushing frame 143 is manually pushed to the right side, the secondary filter plate 10 is clamped with the ejecting frame 141 again, the secondary filter plate 10 is manually pushed downwards to be installed on the connecting frame 3, and then the wedge-shaped pushing frame 143 is reset to clamp the ejecting frame 141, so that the compression spring 142 is compressed.

As shown in fig. 1, fig. 2, fig. 12 and fig. 13, the multifunctional filter further includes an ejecting mechanism 14, the ejecting mechanism 14 includes an ejecting frame 141, a compression spring 142, a wedge-shaped ejecting frame 143, an air outlet cylinder 144 and a return spring 145, the ejecting frame 141 for ejecting the secondary filter plate 10 is symmetrically arranged on the front and back of the right side in the connecting frame 3, the two ejecting frames 141 are connected with the secondary filter plate 10 in a sliding manner, the compression spring 142 is connected between the ejecting frame 141 and the inside of the connecting frame 3, the air outlet cylinder 144 is communicated with the right side of the top of the connecting frame 3, the wedge-shaped ejecting frame 143 is arranged on the right side of the top of the connecting frame 3, the wedge-shaped ejecting frame 143 is connected with the air outlet cylinder 144 in a sliding manner, the return spring 145 is connected between the wedge-shaped ejecting frame 143 and the inside of the air outlet cylinder 144, and the two ejecting frames 141 are clamped by the wedge-shaped ejecting frame 143.

After the secondary filter plate 10 is installed, the controller 201 controls the electric slide rail 131 to drive the electric slide block 132 to move and reset to the left side, so as to drive the sealing block 133 to move to the left side, so that the sealing block 133 does not press the moving frame 135 any more, the moving frame 135 moves and resets to the left side under the reset action of the pressing spring 136, so as to pull the toothed ring 139 to rotate reversely, so that the toothed ring 139 drives the spur gear 1311 and the closing plate 1310 to rotate reversely, so that the closing plate 1310 does not block the communication pipe 4 any more, after the sealing block 133 moves to the left side and does not block the passage between the purification frame 1 and the connection frame 3 any more, the purified gas in the purification frame 1 enters the connection frame 3, and then enters the communication pipe 4 through the filtration of the secondary filter plate 10, so that the purification of the gas in the purification frame 1 is not influenced by the cooperation of the replacement mechanism 13 and the pop-up mechanism 14, and the passage through which the gas flows can be automatically closed, so as to avoid the gas leakage.

As shown in fig. 1, 2, 14 and 15, the exhaust gas purification device further includes a rotary spraying mechanism 15, the rotary spraying mechanism 15 includes a water tank 151, an atomizing spray frame 152, a driven gear 153, a driving motor 154, a driving gear 155 and a fan 156, the water tank 151 for storing the exhaust gas deodorant is fixed outside the communication pipe 4, the atomizing spray frame 152 is fixed on the rotary pipe 5, the atomizing spray frame 152 is rotatably connected with the water tank 151, the driven gear 153 is fixed outside the rotary pipe 5, the driving motor 154 for rotating the atomizing spray frame 152 to uniformly spray the exhaust gas deodorant is installed on the front side of the connection pipe 6, the driving gear 155 is connected to an output shaft of the driving motor 154, the driving gear 155 is engaged with the driven gear 153, the fan 156 is fixed inside the atomizing spray frame 152, the fan 156 is located inside the rotary pipe 5, so that the gas in the communication pipe 4 is discharged downwards more quickly, and the atomizing spray frame 152, the driving motor 154 and the fan 156 are electrically connected with the controller 201.

When the device is used, a waste gas deodorant is added into the water tank 151, the atomizing spray frame 152 and the driving motor 154 are opened through the operation controller 201, the atomizing spray frame 152 sprays the waste gas deodorant in the water tank 151 into the rotating pipe 5 and then contacts with purified gas, so that the gas enters the connecting pipe 6 and the chimney 7 through the deodorization of the waste gas deodorant, the output shaft of the driving motor 154 rotates to drive the rotating pipe 5 to rotate through the transmission of the driving gear 155 and the driven gear 153, and further drives the atomizing spray frame 152, so that the atomizing spray frame 152 uniformly sprays the waste gas deodorant to contact with the gas, a good deodorization effect is achieved, the fan 156 can also be opened through the controller 201, the fan 156 rotates to accelerate the flow of the gas in the communicating pipe 4, the gas entering speed of the chimney 7 is improved, after the coal-fired boiler finishes generating no more smoke, and the atomizing spray frame 152 and the driving motor 154 are closed.

As shown in fig. 16, the liquid container further includes a sloped frame 161 and a baffle 162, the sloped frame 161 for storing liquid is connected to the lower portion of the connection pipe 6, and the baffle 162 for blocking liquid is fixed to a position on the right side of the sloped frame 161 in the connection pipe 6.

The waste gas deodorant is sprayed on the purified gas to deodorize the gas, redundant liquid flows downwards through the connecting pipe 6 and is further stored in the inclined frame 161, the baffle plate 162 can block the liquid to prevent the liquid from flowing into the chimney 7, and the external pipe is connected to the inclined frame 161 to discharge the redundant liquid.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A nitrogen oxide purification device for a coal-fired boiler comprises a purification frame (1), a fan (2), a controller (201), a connecting frame (3), an exhaust assembly, a primary filter plate (8), a catalyst (9) and a secondary filter plate (10), wherein the fan (2) is symmetrically installed on the left and right of the lower part of the purification frame (1), the fan (2) is used for sending flue gas into the purification frame (1), the controller (201) is installed on the front side of the lower part of the purification frame (1), the controller (201) is electrically connected with the fan (2), the top of the purification frame (1) is communicated with the connecting frame (3), the right side of the bottom of the connecting frame (3) is provided with the exhaust assembly for discharging purified gas, the primary filter plate (8) for filtering dust in the flue gas is installed on the lower part in the purification frame (1), the catalyst (9) is installed on the upper part in the purification frame (1), the secondary filter plate (10) for secondarily filtering and purifying the flue gas is installed in the middle in the connection frame (3), the purification frame (11) is further provided with an ammonia gas spraying and discharging mechanism (11) and a nitrogen oxide mixing mechanism (12) for detecting the concentration of the ammonia gas (11) and the ammonia gas after the ammonia gas purification frame (12), ammonia spouts puts mechanism (11) including nitrogen oxide sensor (115) and siren (118), install nitrogen oxide sensor (115) that are used for detecting nitrogen oxide concentration in the gas after the purification on the exhaust subassembly, siren (118) are installed to purification frame (1) front side, siren (118) and oxide sensor all link to each other with controller (201) electrical property, detect nitrogen oxide concentration in the gas after the purification through nitrogen oxide sensor (115), concentration is higher than behind the default and makes siren (118) send out the alarm and warn the staff.

2. The nitrogen oxide purifying device for the coal-fired boiler according to claim 1, wherein the exhaust assembly comprises a communicating pipe (4), a rotating pipe (5), a connecting pipe (6) and a chimney (7), the communicating pipe (4) is communicated with the right side of the bottom of the connecting frame (3), the rotating pipe (5) is rotatably communicated with the lower end of the communicating pipe (4) so as to facilitate the gas flow, the connecting pipe (6) is rotatably communicated with the lower end of the rotating pipe (5), the chimney (7) for discharging the purified gas is arranged on the right side of the purifying frame (1), and the connecting pipe (6) is communicated with the chimney (7).

3. The nitrogen oxide purification device for the coal-fired boiler as claimed in claim 2, characterized in that the ammonia gas spraying mechanism (11) further comprises a gas spraying frame (111), a suction pump (112), a collection frame (113), a staggered liquid collection frame (114), a return pipe (116) and a pumping pump (117), the gas spraying frame (111) is installed at a position on the upper side of the primary filter plate (8) in the purification frame (1), the suction pump (112) is installed on the right side of the gas spraying frame (111) so as to pump the ammonia gas into the gas spraying frame (111) through the suction pump (112) to be sprayed out and mixed with the flue gas, the suction pump (112) is electrically connected with the controller (201), the staggered liquid collection frame (114) is fixed at a position below the catalyst (9) in the purification frame (1), the collection frame (113) is connected on the right side of the staggered liquid collection frame (114), the return pipe (116) is communicated between the purification frame (1) and the communication pipe (4), the pumping pump (117) is installed on the return pipe (116), the purified gas is pumped back to the purification frame (116) through the pumping pump (117) to improve the purification quality of the flue gas for the secondary purification.

4. The nitrogen oxide purification device for the coal-fired boiler according to claim 1, wherein the gas mixing mechanism (12) comprises a servo motor (121), a wind wheel (122), a flat belt (123), a belt pulley (124) and a wind guide frame (125), the servo motor (121) is installed on the left side of the upper portion of the purification frame (1), the servo motor (121) is electrically connected with the controller (201), the wind guide frame (125) is fixed in the middle of the interior of the purification frame (1), wind outlets are uniformly formed in the front side and the rear side of the wind guide frame (125) so that smoke can be upwards discharged, the wind wheels (122) are symmetrically and rotatably arranged in the front and rear side of the wind guide frame (125), the two wind wheels (122) are rotatably connected with the purification frame (1), an output shaft of the servo motor (121) is connected with the wind wheel (122) on the rear side, the belt pulley (124) is fixed on the left side of the two wind wheels (122), the flat belt (123) is arranged on the two belt pulleys (124), and the wind wheel (122) is sleeved with the servo motor (121) as a power source to fully mix ammonia gas and purify the smoke in the next step.

5. The nitrogen oxide purification device for the coal-fired boiler according to claim 2, characterized in that it further comprises a replacement mechanism (13), the replacement mechanism (13) comprises electric slide rails (131), electric slide blocks (132), sealing blocks (133), one-way valves (134), a movable frame (135), an extrusion spring (136), an exhaust pipe (137), an exhaust pump (138), a toothed ring (139), a closing plate (1310) and a spur gear (1311), the electric slide rails (131) are symmetrically installed in the connection frame (3) at the front and back of the left side, the electric slide rails (131) are electrically connected with the controller (201), the sliding electric slide blocks (132) are arranged between the two electric slide rails (131), the sealing blocks (133) are fixed on the electric slide blocks (132), the sealing blocks (133) are slidably connected with the inside of the connection frame (3), after the sealing blocks (133) move to the right side and cross the purification frame (1), the internal space of the connection frame (3) can be separated from the left and right side, so that the gas discharged from the purification frame (1) can not be discharged from the inside the communication pipe (4), the connection frame (3) through the one-way valves (134), the top of the connection frame (3) can not be discharged from the outside through the one-way valves (134), an extrusion spring (136) is connected between the moving frame (135) and the connecting frame (3), the right side of the connecting frame (3) is communicated with an exhaust pipe (137), the lower end of the exhaust pipe (137) is communicated with a communicating pipe (4), an exhaust pump (138) is installed on the exhaust pipe (137), the exhaust pump (138) is electrically connected with the controller (201), residual gas inside the connecting frame (3) can be pumped to the inside of the communicating pipe (4) through the exhaust pump (138), a toothed ring (139) is rotatably arranged at the upper end in the communicating pipe (4), five closing plates (1310) are uniformly and rotatably arranged at the upper part in the circumferential direction in the communicating pipe (4), straight gears (1311) are fixedly arranged at the tops of the closing plates (1310), the straight gears (1311) are respectively meshed with the toothed ring (139), the moving frame (135) is slidably connected with the toothed ring (139), the sealing block (133) can move towards the right side to push the moving frame (135), so that the moving frame (135) pushes the toothed ring (139) to rotate, and further, the five closing plates (1310) are mutually blocked to seal the communicating pipe (4), and the gas enters the communicating pipe (4).

6. The nitrogen oxide purification device for the coal-fired boiler as claimed in claim 5, characterized by further comprising a pop-up mechanism (14), wherein the pop-up mechanism (14) comprises pop-up frames (141), compression springs (142), wedge-shaped push frames (143), air outlet cylinders (144) and return springs (145), the pop-up frames (141) are symmetrically arranged on the front and back of the right side in the connecting frame (3) in a sliding manner, the two pop-up frames (141) are clamped with the secondary filter plates (10), the compression springs (142) are connected between the pop-up frames (141) and the inside of the connecting frame (3), the air outlet cylinders (144) are communicated with the right side of the top of the connecting frame (3), the wedge-shaped push frames (143) are arranged on the right side of the top of the connecting frame (3) in a sliding manner, the wedge-shaped push frames (143) are connected with the air outlet cylinders (144), the return springs (145) are connected between the wedge-shaped push frames (143) and the inside of the air outlet cylinders (144), and the two pop-up frames (141) are clamped by the wedge-shaped push frames (143).

7. The nitrogen oxide purification device for the coal-fired boiler as claimed in claim 2, characterized by further comprising a rotary spraying mechanism (15), wherein the rotary spraying mechanism (15) comprises a water tank (151), an atomizing spray frame (152), a driven gear (153), a driving motor (154), a driving gear (155) and a fan (156), the water tank (151) for storing the waste gas deodorant is fixed on the outer side of the communicating pipe (4), the atomizing spray frame (152) is fixed on the rotating pipe (5), the atomizing spray frame (152) is rotatably connected with the water tank (151), the driven gear (153) is fixed on the outer side of the rotating pipe (5), the driving motor (154) is installed on the front side of the connecting pipe (6), the driving gear (155) is connected on an output shaft of the driving motor (154), the driving gear (155) is meshed with the driven gear (153), the atomizing spray frame (152) can rotate and spray the waste gas deodorant in the rotating pipe (5), the fan (156) is fixed on the inner side of the atomizing spray frame (152), the fan (156) is located inside the rotating pipe (5), and the atomizing spray frame (152), the driving motor (154) is electrically connected with the fan (156) and the controller (201).

8. The nitrogen oxide purification device for a coal-fired boiler as claimed in claim 2, further comprising an inclined frame (161) and a baffle (162), wherein the inclined frame (161) for storing liquid contained in the gas is communicated with the lower portion of the connection pipe (6), and the baffle (162) for blocking the liquid is fixed at a position on the right side of the inclined frame (161) in the connection pipe (6).