A hydrolyzer for flue gas denitration in power plants

Abstract

The present invention relates to the technical field of denitration equipment, and specifically to a hydrolyzer for flue gas denitration in a power plant, comprising a reaction container and a heater, a liquid inlet pipe and an exhaust pipe are arranged on the side wall of the reaction container, the liquid inlet pipe is used to introduce a urea solution into the reaction container, the heater is used to heat the urea solution in the reaction container, the exhaust pipe is used to discharge ammonia generated after the urea solution is heated out of the reaction container, a filter pipe is connected between the liquid inlet pipe and the exhaust pipe, one end of the filter pipe is connected to the liquid inlet pipe, and the other end is connected to the exhaust pipe, a plurality of filter holes are arranged on the filter pipe, the urea solution passing through the liquid inlet pipe flows into the reaction container from the filter holes, at least a part of the filter holes is located above the urea solution, the ammonia generated in the reaction container enters the filter pipe through the filter holes located above the urea solution, and is discharged outwardly from the exhaust pipe. The present invention reduces the influence of impurities in the urea solution on the heater, and improves the thermal decomposition effect of the urea solution.

Description

Technical Field

[0001] The invention relates to the technical field of denitration equipment, and in particular to a hydrolyzer for denitration of flue gas in a power plant. Background Art

[0002] When thermal power plants generate electricity, the boilers will discharge a large amount of exhaust gas into the atmosphere, and the exhaust gas contains a large amount of toxic gases. In order to ensure the safety and health of the atmospheric environment, the exhaust gas needs to be denitrated and desulfurized. One of the current mainstream denitrification technologies is SCR flue gas denitrification technology, which is also one of the most mature technologies and is widely used in thermal power plants.

[0003] When using SCR flue gas denitration equipment to denitrate flue gas, it is necessary to prepare reducing agent ammonia gas with urea solution in a hydrolyzer. There are two main methods for preparing reducing agent ammonia gas: pyrolysis method and hydrolysis method. The existing hydrolyzer usually includes a reaction container, a heater is provided in the reaction container, and a liquid inlet and an exhaust port are opened on the side wall of the reaction container. The liquid inlet is used to pass urea solution into the reaction container, and the heater is used to heat the urea solution in the reaction container. After the urea solution is heated, it is pyrolyzed to produce ammonia gas, which is discharged from the exhaust port.

[0004] Since the urea solution contains pollutants, such as floating materials and polycondensation products such as biuret brought in by the urea raw materials, and impurities in the water, these pollutants and impurities will accumulate in the hydrolyzer, thereby affecting the heat exchange efficiency and operating conditions of the heater coil. Existing hydrolyzers usually have a sewage outlet at the bottom of the reaction vessel to regularly discharge pollutants and impurities in the reaction vessel, but since pollutants and impurities are easy to adhere to the side walls of the heater coil, the thermal decomposition effect of the urea solution is reduced. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention proposes a hydrolyzer for flue gas denitrification in a power plant to solve the technical problem that pollutants and impurities in the prior art hydrolyzer are easily adhered to the heater coil, thereby reducing the thermal decomposition effect of urea.

[0006] The hydrolyzer for denitrification of flue gas in a power plant of the present invention adopts the following technical scheme:

[0007] A hydrolyzer for flue gas denitration in a power plant comprises a reaction container and a heater. A liquid inlet pipe and an exhaust pipe are arranged on the side wall of the reaction container. The liquid inlet pipe is used to introduce a urea solution into the reaction container. The heater is used to heat the urea solution in the reaction container. The exhaust pipe is used to discharge ammonia generated by the heated urea solution out of the reaction container. A filter pipe is connected between the liquid inlet pipe and the exhaust pipe. One end of the filter pipe is connected to the liquid inlet pipe, and the other end is connected to the exhaust pipe. A plurality of filter holes are arranged on the filter pipe. The urea solution passing through the liquid inlet pipe flows into the reaction container from the filter holes. At least a part of the filter holes is located above the urea solution. The ammonia generated in the reaction container enters the filter pipe through the filter holes located above the urea solution and is discharged outward from the exhaust pipe.

[0008] Furthermore, the filter pipe includes an upper transition pipe, a lower transition pipe and a filter cartridge rotatably arranged between the upper transition pipe and the lower transition pipe, the upper transition pipe is located above the lower transition pipe, the upper transition pipe is fixedly connected to the exhaust pipe and is internally connected, the lower transition pipe is fixedly connected to the liquid inlet pipe and is internally connected, the filter holes are arranged on the side wall of the filter cartridge, the upper end of the filter cartridge is rotatably connected to the upper transition pipe, and the lower end is rotatably connected to the lower transition pipe, and the interior of the filter cartridge is respectively connected to the interiors of the upper transition pipe and the lower transition pipe.

[0009] Furthermore, a center rod is connected to the upper end of the filter cylinder, and a fan blade is fixed to the upper end of the center rod. The center rod and the fan blade are located in the upper transition pipe. When the ammonia generated in the reaction container enters the upper transition pipe through the filter hole, the fan blade can be driven to rotate, thereby driving the center rod and the filter cylinder to rotate.

[0010] Furthermore, a partition is provided in the filter cartridge, and the partition divides the internal space of the filter cartridge into an upper chamber and a lower chamber. The filter holes are opened on the side wall of the upper chamber, and a part of the filter holes are located above the urea solution. The lower chamber is used to store impurities filtered out by the filter holes. A plurality of drop holes are opened on the partition, and a baffle is provided at the drop holes for preventing impurities in the lower chamber from entering the upper chamber upward.

[0011] Furthermore, the filter cartridge is arranged at an angle. In the process of the filter cartridge being driven to rotate by the fan blade, a part of the filter hole is always located above the urea solution. The partition is movably arranged in the filter cartridge. The partition can rotate synchronously with the filter cartridge and can move back and forth along the axis of the filter cartridge. A floating block is fixed on the partition. The floating block alternately sinks into and is exposed to the urea solution in the process of the partition rotating with the filter cartridge. The floating block is subjected to the buoyancy when sinking into the urea solution and can drive the partition to move upward along the axis of the filter cartridge. When the floating block is exposed to the urea solution, the partition moves downward along the axis of the filter cartridge under the action of its own gravity. The partition scrapes off impurities on the inner wall of the filter cartridge during the up and down reciprocating movement.

[0012] Furthermore, the upper end of the lower transition pipe extends to the middle of the filter cartridge, the partition is provided with a central hole for avoiding the lower transition pipe, and the upper end of the lower transition pipe is provided with a first one-way valve, which allows the urea solution to flow out upward.

[0013] Furthermore, a plurality of partition plates are provided at intervals along the circumferential direction of the lower transition pipe in the lower chamber, and the plurality of partition plates are radially distributed to divide the lower chamber into a plurality of storage rooms for storing impurities.

[0014] Furthermore, a plurality of sewage outlets are provided at intervals along the circumference of the side wall of the lower transition pipe, each sewage outlet is respectively connected to two adjacent storage rooms, and a second one-way valve is provided at each sewage outlet, and the second one-way valve is used to allow impurities in each storage room to enter the lower transition pipe. When in use, the liquid inlet pipe is connected with a sewage discharge channel and a liquid inlet channel through a three-way pipe. When urea solution needs to be introduced into the reaction container, the sewage discharge channel is closed, and the urea solution enters the reaction container from the liquid inlet channel. When sewage discharge is required, the liquid inlet channel is closed, and the impurities in the storage room are discharged to the outside through the sewage discharge channel.

[0015] Furthermore, a guide rod is fixed in the filter cartridge, the extension direction of the guide rod is parallel to the axis of the filter cartridge, the floating block is fixed on the partition and slidably sleeved on the periphery of the guide rod, and the floating block cooperates with the guide rod in a guiding manner.

[0016] Furthermore, a heating chamber is provided at one end of the reaction container away from the liquid inlet pipe, and the heating chamber has a first chamber and a second chamber, the first chamber and the second chamber are separated from each other, a steam inlet is connected to the side wall of the first chamber, and a steam outlet is connected to the side wall of the second chamber, and the heater includes a heating coil, one end of the heating coil is connected to the first chamber, and the other end is connected to the second chamber.

[0017] The beneficial effects of the present invention are as follows: a hydrolyzer for flue gas denitrification in a power plant of the present invention connects a filter pipe between a liquid inlet pipe and an exhaust pipe, and utilizes the filter pipe to filter the urea solution entering a reaction container, thereby reducing the influence of impurities on the heater in the reaction container and improving the heating effect of the heater on the urea solution.

[0018] Furthermore, the present invention arranges the filter cartridge of the filter pipe to be rotatable, and utilizes the power generated by the outward exhaust to drive the filter cartridge to rotate, the filter holes on the filter cartridge alternately sink into and expose the urea solution, and the discharged ammonia gas is utilized to blow impurities on the inner wall of the filter cartridge inwardly, and the buoyancy generated by the urea solution is utilized to drive the partition to move up and down to scrape off the impurities on the inner wall of the filter cartridge, thereby reducing the possibility of the filter cartridge being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of a hydrolyzer for flue gas denitration in a power plant according to the present invention;

[0021] Figure 2 It is a front view of an embodiment of a hydrolyzer for flue gas denitration in a power plant according to the present invention;

[0022] Figure 3 for Figure 2 A top view of

[0023] Figure 4 for Figure 3 Middle AA section view;

[0024] Figure 5 for Figure 4 A magnified view of the part B in the middle;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of a filter pipe in one embodiment of a hydrolyzer for flue gas denitration in a power plant according to the present invention;

[0026] Figure 7 A top view of a filter pipe in one embodiment of a hydrolyzer for flue gas denitration in a power plant according to the present invention;

[0027] Figure 8 for Figure 7 Middle CC section view;

[0028] Fig. 9 for Figure 8 A magnified view of the local D in the middle;

[0029] In the figure: 101, reaction vessel; 102, support leg; 103, liquid inlet pipe; 104, exhaust pipe; 105, steam inlet; 106, steam outlet; 107, heating coil; 108, sewage outlet; 109, heating chamber; 200, filter pipe; 201, lower transition pipe; 2011, first one-way valve; 2012, sewage outlet; 202, partition plate; 203, guide rod; 204, floating block; 2041, filter screen; 2042, baffle; 2043, partition; 205, filter cartridge; 2051, filter hole; 206, fan blade; 207, upper transition pipe; 300, urea solution liquid level. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] An embodiment of a hydrolyzer for denitrification of flue gas in a power plant according to the present invention is as follows: Figures 1 to 9As shown, the hydrolyzer for flue gas denitration in the power plant is a part of the flue gas denitration equipment of the whole power plant. The reducing agent ammonia generated by the hydrolyzer is used to react with the flue gas to achieve denitration treatment of the flue gas. In the present invention, the hydrolyzer for flue gas denitration in the power plant includes a reaction vessel 101 and a heater. The axis of the reaction vessel 101 extends in the left-right direction. Two legs 102 are fixed to the bottom of the reaction vessel 101. The two legs 102 are arranged at intervals on the left and right to support the reaction vessel 101. A liquid inlet pipe 103 and an exhaust pipe 104 are provided on the side wall of the reaction vessel 101. The liquid inlet pipe 103 is located at one end of the reaction vessel 101 and is located near the bottom of the reaction vessel 101. The exhaust pipe 104 is located at the top of the reaction vessel 101 and is located at one end of the reaction vessel 101 near the liquid inlet pipe 103. The liquid inlet pipe 103 is used to introduce urea solution into the reaction container 101, the heater is used to heat the urea solution in the reaction container 101, and the exhaust pipe 104 is used to discharge ammonia generated by the heated urea solution out of the reaction container 101. In this embodiment, a heating chamber 109 is provided at one end of the reaction container 101 away from the liquid inlet pipe 103, and the heating chamber 109 has a first chamber and a second chamber, the first chamber and the second chamber are separated from each other, a steam inlet 105 is connected to the side wall of the first chamber, and a steam outlet 106 is connected to the side wall of the second chamber, and the heater includes a heating coil 107, one end of the heating coil 107 is connected to the first chamber, and the other end is connected to the second chamber, and the heating coil 107 is located in the reaction container 101 and performs heat exchange with the urea solution in the reaction container 101. When in use, high-temperature steam is continuously introduced into the steam inlet 105 so that the heating coil 107 heats the urea solution in the reaction container 101 . The urea solution is heated to generate ammonia gas which is discharged from the exhaust pipe 104 .

[0032] In the present invention, in order to filter the impurities in the urea solution and reduce the influence of the impurities on the heating coil 107 in the reaction vessel 101, a filter pipe 200 is connected between the liquid inlet pipe 103 and the exhaust pipe 104. In this embodiment, the liquid inlet pipe 103 and the exhaust pipe 104 both extend to the interior of the reaction vessel 101, one end of the filter pipe 200 is connected to the liquid inlet pipe 103, and the other end is connected to the exhaust pipe 104. The filter pipe 200 is provided with a plurality of filter holes 2051, and the urea solution passing through the liquid inlet pipe 103 flows into the reaction vessel 101 from the filter holes 2051, and at least a part of the filter holes 2051 is located above the urea solution. The ammonia generated in the reaction vessel 101 enters the filter pipe 200 through the filter holes 2051 located above the urea solution, and is discharged from the exhaust pipe 104.

[0033] In this embodiment, the filter pipe 200 includes an upper transition pipe 207, a lower transition pipe 201, and a filter cartridge 205 rotatably disposed between the upper transition pipe 207 and the lower transition pipe 201. Specifically, the upper end of the filter cartridge 205 is rotatably connected to the upper transition pipe 207, and the lower end is rotatably connected to the lower transition pipe 201. The interior of the filter cartridge 205 is respectively connected to the interiors of the upper transition pipe 207 and the lower transition pipe 201. The upper transition pipe 207 is fixedly connected to the exhaust pipe 104 and is internally connected, and the lower transition pipe 201 is fixedly connected to the liquid inlet pipe 103 and is internally connected. The filter hole 2051 is disposed on the side wall of the filter cartridge 205.

[0034] In this embodiment, the upper end of the filter cartridge 205 is connected with a center rod. Specifically, the upper end of the filter cartridge 205 is provided with a plurality of connecting rods extending radially along the filter cartridge 205, and the plurality of connecting rods are arranged radially and connected to each other at the center position, and the lower end of the center rod is fixed at the connection position of the plurality of connecting rods. The upper end of the center rod is fixed with a fan blade 206, and the center rod and the fan blade 206 are both located in the upper transition pipe 207. When the ammonia generated in the reaction vessel 101 enters the upper transition pipe 207 through the filter hole 2051, the fan blade 206 can be driven to rotate, thereby driving the center rod and the filter cartridge 205 to rotate. It should be noted here that during normal operation, the air pressure in the reaction vessel 101 is relatively high, with more than 5 atmospheric pressure values, so the speed of ammonia when discharged from the exhaust pipe 104 is relatively large, which can drive the fan blade 206 to rotate and drive the entire filter cartridge 205 to rotate.

[0035] In this embodiment, a partition 2043 is provided inside the filter cartridge 205. The partition 2043 divides the internal space of the filter cartridge 205 into an upper chamber and a lower chamber. The filter holes 2051 are provided on the side wall of the upper chamber, and a part of the filter holes 2051 are located above the urea solution. The lower chamber is used to store impurities filtered out by the filter holes 2051. A plurality of drop holes are provided on the partition 2043 at intervals, and the plurality of drop holes are evenly arranged along the circumference of the partition 2043. A filter net 2041 is provided between two adjacent drop holes on the partition 2043; in this embodiment, the filter net 2041 and the partition 2043 are an integral structure, and the filter net 2041 is formed by a plurality of perforations provided on the partition 2043. The drop hole is provided with a baffle 2042 for preventing impurities in the lower chamber from entering the upper chamber upwards. One end of the baffle 2042 is connected to the lower side of the partition 2043, and the other end can swing in the up and down direction to realize the opening and closing of the drop hole. When one end of the baffle 2042 swings upward, the baffle 2042 fits with the lower side of the partition 2043, thereby closing the drop hole. When one end of the baffle 2042 swings downward, the baffle 2042 opens the drop hole, that is, the baffle 2042 and the drop hole constitute a one-way valve structure. In this embodiment, the baffle 2042 is a flexible rubber sheet structure that can be bent and deformed. In other embodiments, the baffle 2042 can also be rotatably connected to the partition 2043. An elastic reset member is provided between the baffle 2042 and the partition 2043 to drive the baffle 2042 to close the drop hole in the initial state.

[0036] In this embodiment, the filter cartridge 205 is tiltedly arranged in the reaction vessel 101. When the reaction vessel 101 is in use, a portion of the filter cartridge 205 is submerged in the urea solution, that is, it is located below the urea solution liquid level 300, and the other portion is located above the urea solution liquid level 300. In the process of the fan blade 206 driving the filter cartridge 205 to rotate, a portion of the filter hole 2051 is always located above the urea solution. The partition 2043 is movably arranged in the filter cartridge 205, and the partition 2043 can rotate synchronously with the filter cartridge 205 and can reciprocate along the axis of the filter cartridge 205. A floating block 204 is fixed on the partition 2043, and the floating block 204 alternately sinks into and emerges from the urea solution during the process of the partition 2043 rotating with the filter cartridge 205. When the floating block 204 sinks into the urea solution, the buoyancy it receives can drive the partition 2043 to move upward along the axis of the filter cartridge 205. When the floating block 204 is exposed to the urea solution, the partition 2043 moves downward along the axis of the filter cartridge 205 under the action of its own gravity. The partition 2043 scrapes off the impurities on the inner wall of the filter cartridge 205 during the up and down reciprocating movement, and the scraped impurities fall into the lower chamber below. During the up and down reciprocating movement of the partition 2043, the filter screen 2041 can allow the urea solution to pass through, thereby reducing the liquid resistance encountered by the partition 2043 when it moves up and down. The filter screen 2041 does not allow impurities to pass through, and the scraped impurities enter the lower chamber below through the drop opening. Specifically, when the partition 2043 moves upward, the baffle 2042 will be impacted by the urea solution to a certain extent, causing the baffle 2042 to open the drop opening downward. At this time, as the partition 2043 moves upward, the impurities will also actively enter the lower chamber below with the urea solution. When the partition 2043 moves downward, under the impact of the urea solution, the baffle 2042 will close the drop opening to prevent impurities in the lower chamber from entering the upper chamber upward.

[0037] In this embodiment, in order to prevent impurities from accumulating only at the bottom of the lower chamber, a plurality of partition plates 202 are provided in the lower chamber at circumferential intervals along the lower transition pipe 201. The plurality of partition plates 202 are radially distributed to divide the lower chamber into a plurality of storage rooms for storing impurities. During the rotation of the filter cartridge 205, the impurities can be distributed to each storage room.

[0038] In this embodiment, the upper end of the lower transition pipe 201 extends to the middle of the filter cartridge 205. When the partition 2043 is at the lowest position, the upper end of the upper transition pipe 207 is located above the partition 2043, so that the urea solution can enter the reaction vessel 101 from above the partition 2043 through the filter hole 2051. In order to avoid interference between the partition 2043 and the upper transition pipe 207, the partition 2043 is provided with a central hole for avoiding the lower transition pipe 201. The upper end of the lower transition pipe 201 is provided with a first one-way valve 2011, which allows the urea solution to flow out upward and prevents impurities from entering from the upper end of the upper transition pipe 207.

[0039] In this embodiment, in order to discharge impurities in the filter cartridge 205, a plurality of sewage outlets 2012 are provided at intervals along the circumference of the side wall of the lower transition pipe 201, and each sewage outlet 2012 is respectively connected to two adjacent storage rooms. A second one-way valve is provided at each sewage outlet 2012, and the second one-way valve is used to allow impurities in each storage room to enter the lower transition pipe 201. When in use, the liquid inlet pipe 103 is connected to a sewage discharge channel and a liquid inlet channel (not shown in the figure) through a three-way pipe. When it is necessary to introduce urea solution into the reaction container 101, the sewage discharge channel is closed, and the urea solution enters the reaction container 101 from the liquid inlet channel. When sewage discharge is required, the liquid inlet channel is closed, and the impurities in the storage room are discharged to the outside through the sewage discharge channel.

[0040] In this embodiment, in order to ensure that the partition 2043 can move up and down stably in the filter cartridge 205, a guide rod 203 is fixed in the filter cartridge 205, and the extension direction of the guide rod 203 is parallel to the axis of the filter cartridge 205. The floating block 204 is fixed on the partition 2043 and slidably mounted on the outer periphery of the guide rod 203, and the floating block 204 cooperates with the guide rod 203 for guidance.

[0041] In this embodiment, a sewage outlet 108 is provided at the bottom of the reaction container 101 between the two legs 102 , and the sewage outlet 108 can be used to regularly discharge the urea solution at the bottom of the reaction container 101 to ensure the solubility of the urea solution in the reaction container 101 .

[0042] The working process of the hydrolyzer for flue gas denitration in a power plant of the present invention is as follows: at the beginning of the work, the sewage discharge channel is closed, the liquid inlet channel is opened, and the urea solution is injected into the reaction container 101 from the liquid inlet pipe 103 until the urea solution occupies half of the space in the reaction container 101, that is, the urea solution liquid level 300 is at the center of the reaction container 101. During the process of introducing the urea solution, the urea solution sequentially passes through the liquid inlet pipe 103 and the lower transition pipe 201, and flows out from the first one-way valve 2011 at the upper end of the lower transition pipe 201, and finally enters the interior of the reaction container 101 through the filter hole 2051 on the side wall of the filter cartridge 205. Under the filtering action of the filter cartridge 205, the impurities in the urea solution are intercepted in the filter cartridge 205 and are located above the partition 2043, and then the impurities fall into the storage room of the lower chamber through the drop hole.

[0043] Then, high-temperature steam is introduced into the heating coil 107, and the high-temperature steam transfers heat to the urea solution in the reaction vessel 101, so that the urea solution is thermally decomposed to form ammonia. As the gas above the urea solution level 300 increases, the gas passes through the filter hole 2051 located above the urea solution level 300 on the filter cartridge 205, and is discharged outward through the upper transition pipe 207 and the exhaust pipe 104. In the process of gas discharge, the gas drives the fan blade 206 to rotate, and the fan blade 206 drives the entire filter cartridge 205 to rotate. When the filter cartridge 205 rotates, the partition 2043 rotates with the filter cartridge 205, and the floating block 204 on the partition 2043 will rotate to different positions and be subject to different buoyancy. When the floating block 204 gradually sinks into the urea solution, the buoyancy of the floating block 204 increases, and the floating block 204 will drive the partition 2043 to move upward. When the floating block 204 is exposed above the urea solution, the partition 2043 moves downward under the action of its own gravity. During the reciprocating up and down movement of the partition 2043, the partition 2043 scrapes off the impurities on the inner wall of the filter cartridge 205. At the same time, during the gas discharge process, since the gas flows from the outside of the filter cartridge 205 to the inside, it helps to blow the impurities on the inner wall of the filter cartridge 205 toward the inside of the filter cartridge 205, and as the filter cartridge 205 rotates, the filter holes 2051 at different positions on the filter cartridge 205 can alternately expose the urea solution liquid surface 300, thereby reducing the possibility of clogging of the filter holes 2051. When in use, in order to avoid excessive accumulation of impurities, it is necessary to regularly discharge the impurities in the filter cartridge 205. When discharging sewage, the liquid inlet channel is closed, the sewage discharge channel is opened, and the impurities at the bottom of the filter cartridge 205 are discharged outward through the sewage discharge port 2012 using the urea solution in the reaction vessel 101.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrolyzer for flue gas denitration in a power plant, comprising a reaction vessel (101) and a heater, wherein a liquid inlet pipe (103) and an exhaust pipe (104) are provided on a side wall of the reaction vessel (101), wherein the liquid inlet pipe (103) is used to introduce a urea solution into the reaction vessel (101), the heater is used to heat the urea solution in the reaction vessel (101), and the exhaust pipe (104) is used to discharge ammonia generated by the heating of the urea solution out of the reaction vessel (101), characterized in that: A filter pipe (200) is connected between the liquid inlet pipe (103) and the exhaust pipe (104); one end of the filter pipe (200) is in communication with the liquid inlet pipe (103), and the other end is in communication with the exhaust pipe (104); a plurality of filter holes (2051) are provided on the filter pipe (200); urea solution passes through the liquid inlet pipe (103) and flows into the reaction container (101) from the filter holes (2051); at least a portion of the filter holes (2051) is located above the urea solution; ammonia generated in the reaction container (101) enters the reaction container (101) through the filter holes (2051) located above the urea solution. The liquid enters the filter pipe (200) and is discharged from the exhaust pipe (104); the filter pipe (200) comprises an upper transition pipe (207), a lower transition pipe (201), and a filter cartridge (205) rotatably arranged between the upper transition pipe (207) and the lower transition pipe (201); the upper transition pipe (207) is located above the lower transition pipe (201); the upper transition pipe (207) is fixedly connected to the exhaust pipe (104) and is internally communicated with the lower transition pipe (201); the lower transition pipe (201) is fixedly connected to the liquid inlet pipe (103) and is internally communicated with the lower transition pipe (201); the filter hole (2051) is arranged in the filter cartridge (205) ) on the side wall, the upper end of the filter cartridge (205) is rotatably connected to the upper transition pipe (207), and the lower end is rotatably connected to the lower transition pipe (201), and the interior of the filter cartridge (205) is communicated with the interior of the upper transition pipe (207) and the lower transition pipe (201) respectively; the upper end of the filter cartridge (205) is connected to a center rod, and the upper end of the center rod is fixed with a fan blade (206), and the center rod and the fan blade (206) are located in the upper transition pipe (207), and when the ammonia generated in the reaction container (101) enters the upper transition pipe (207) through the filter hole (2051), the fan blade (206) can be driven 6) rotates, thereby driving the central rod and the filter cartridge (205) to rotate; a partition (2043) is provided inside the filter cartridge (205), and the partition (2043) divides the internal space of the filter cartridge (205) into an upper chamber and a lower chamber; the filter holes (2051) are provided on the side wall of the upper chamber, and a part of the filter holes (2051) are located above the urea solution; the lower chamber is used to store impurities filtered out by the filter holes (2051); a plurality of drop holes are provided on the partition (2043), and a baffle (2042) is provided at the drop holes for preventing impurities in the lower chamber from entering the upper chamber upward;The filter cartridge (205) is arranged obliquely. When the fan blade (206) drives the filter cartridge (205) to rotate, a portion of the filter hole (2051) is always located above the urea solution. The partition (2043) is movably arranged in the filter cartridge (205). The partition (2043) can rotate synchronously with the filter cartridge (205) and can reciprocate along the axis of the filter cartridge (205). A floating block (204) is fixed on the partition (2043). The floating block (204) is arranged on the partition. The plate (2043) alternately sinks into and emerges from the urea solution as the filter cartridge (205) rotates. The floating block (204) is subjected to buoyancy when sinking into the urea solution and can drive the partition plate (2043) to move upward along the axis of the filter cartridge (205). When the floating block (204) is exposed to the urea solution, the partition plate (2043) moves downward along the axis of the filter cartridge (205) under the action of its own gravity. The partition plate (2043) scrapes off impurities on the inner wall of the filter cartridge (205) during the up and down reciprocating movement.

2. The hydrolyzer for denitrification of flue gas from a power plant according to claim 1, characterized in that: The upper end of the lower transition pipe (201) extends to the middle of the filter cartridge (205), the partition plate (2043) is provided with a central hole for avoiding the lower transition pipe (201), and the upper end of the lower transition pipe (201) is provided with a first one-way valve (2011), and the first one-way valve (2011) allows the urea solution to flow out upwards.

3. The hydrolyzer for denitrification of flue gas from a power plant according to claim 2, characterized in that: A plurality of partition plates (202) are arranged at intervals along the circumference of the lower transition pipe (201) in the lower chamber, and the plurality of partition plates (202) are radially distributed to divide the lower chamber into a plurality of storage rooms for storing impurities.

4. The hydrolyzer for denitrification of flue gas from a power plant according to claim 3, characterized in that: A plurality of sewage outlets (2012) are provided at intervals along the circumference of the side wall of the lower transition pipe (201), each sewage outlet (2012) being connected to two adjacent storage rooms respectively, and a second one-way valve is provided at each sewage outlet (2012), the second one-way valve being used to allow impurities in each storage room to enter the lower transition pipe (201). When in use, the liquid inlet pipe (103) is connected to a sewage discharge channel and a liquid inlet channel via a three-way pipe. When it is necessary to introduce urea solution into the reaction container (101), the sewage discharge channel is closed, and the urea solution enters the reaction container (101) from the liquid inlet channel. When sewage discharge is required, the liquid inlet channel is closed, and the impurities in the storage room are discharged to the outside through the sewage discharge channel.

5. The hydrolyzer for denitrification of flue gas from a power plant according to claim 4, characterized in that: A guide rod (203) is fixed inside the filter cartridge (205), the extension direction of the guide rod (203) is parallel to the axis of the filter cartridge (205), the floating block (204) is fixed on the partition plate (2043) and slidably sleeved on the periphery of the guide rod (203), and the floating block (204) is in guiding cooperation with the guide rod (203).

6. The hydrolyzer for denitrification of flue gas from a power plant according to any one of claims 1 to 5, characterized in that: A heating chamber (109) is provided at one end of the reaction container (101) away from the liquid inlet pipe (103), wherein the heating chamber (109) comprises a first chamber and a second chamber, wherein the first chamber and the second chamber are separated from each other, wherein a steam inlet (105) is connected to a side wall of the first chamber, and a steam outlet (106) is connected to a side wall of the second chamber, and wherein the heater comprises a heating coil (107), wherein one end of the heating coil (107) is connected to the first chamber, and the other end of the heating coil is connected to the second chamber.

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