Denitration and dust removal integrated device and process for waste liquid incineration flue gas
By designing an integrated denitrification and dust removal device for waste liquid incineration flue gas, the combination of high-temperature dust removal tube and denitrification catalyst is used to solve the problem of catalyst deactivation caused by salt particles and smoke in the flue gas, efficient denitrification and catalyst regeneration are achieved, and the service life of the device is extended.
Patent Information
- Application Number
- CN202410950801.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-04-11
AI Technical Summary
The waste liquid incinerates the smoke and the salt particles and smoke dust in the flue gas adhere to the surface of the denitrification catalyst, resulting in the catalyst being deactivated and unable to regenerate, reducing the denitrification efficiency.
A integrated denitrification and dust removal device is designed, including a gas clean chamber, a dust removal and denitrification chamber, ash bucket, an ammonia spraying system, a catalyst regeneration system and a backblowing system. Through the combination of high-temperature dust removal tube and a denitrification catalyst, dust removal and denitrification of the flue gas are realized, and the catalyst is regenerated by heating resistor wire.
It effectively avoids catalyst deactivation, extends the service life of the device, improves denitrification and dust removal efficiency, and shortens the flue gas treatment process.
Smart Images
Figure CN119793188A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of waste liquid incineration, and in particular relates to an integrated denitration and dust removal device and process for waste liquid incineration flue gas. Background Art
[0002] At present, people are paying more and more attention to the quality of air environment, and the requirements for smoke emission in industrial processes are getting higher and higher. The flue gas in the waste liquid incineration process contains a large amount of nitrogen oxides, salt particles and smoke, and the composition is complex. In order to prevent salt from entering the heat exchanger and causing the heat exchanger pipeline to be blocked, the waste liquid incineration flue gas needs to be dusted at high temperature to ensure the cleanliness of the flue gas entering the heat exchanger. In the traditional flue gas purification process, the flue gas first undergoes SCR flue gas denitrification at high temperature, and then the dust is removed after the temperature is reduced to below 200℃. During the denitrification process, a large amount of salt particles and smoke in the flue gas adhere to the surface of the denitrification catalyst, which increases the flue gas operation resistance, the catalyst is quickly deactivated, and the denitrification efficiency is reduced. Summary of the invention
[0003] In order to solve the problem that salt particles and smoke dust adhere to the surface of the denitrification catalyst in the denitrification process of waste liquid incineration flue gas, causing the catalyst to be deactivated and unable to regenerate, the present invention discloses an integrated denitrification and dust removal device and process for waste liquid incineration flue gas, which has the advantages of small footprint, catalyst is not affected by particulate matter in the flue gas, long service life, etc., can greatly shorten the waste liquid incineration flue gas treatment process and increase the denitrification and dust removal efficiency.
[0004] To achieve the above objectives, the present invention adopts the following technical solutions: An integrated denitration and dust removal device for waste liquid incineration flue gas comprises a clean air chamber, a dust removal and denitration chamber, an ash hopper, an ammonia injection system, a catalyst regeneration system, and a backflush system. The clean air chamber is located at the upper part of the dust removal and denitration chamber, and the ash hopper is located at the lower part of the dust removal and denitration chamber. The dust removal and denitration chamber comprises a flower plate, a bottom support frame, a high temperature resistant dust removal pipe, and a denitration catalyst. The flower plate is located at the top of the dust removal and denitration chamber and has a flower plate hole. The bottom support frame is located at the bottom of the dust removal and denitration chamber and has a positioning groove. The high temperature resistant dust removal pipe is a straight pipe that runs through from top to bottom, and an expansion end is provided at the top, which is suspended on the flower plate hole, and the bottom is fixed to the positioning groove. The denitration catalyst is filled in the cavity in the high temperature resistant dust removal pipe. The ammonia injection system comprises an ammonia injection control valve, an ammonia injection pipe, and an ammonia injection head. The ammonia spray control valve is installed on the ammonia spray pipe, the ammonia spray pipe extends into the ash hopper and bends vertically upward to extend into the upper part of the dust removal and denitrification chamber, the ammonia spray head is located on the ammonia spray pipe extending into the dust removal and denitrification chamber, the catalyst regeneration system includes a power supply, a heat-resistant wire, and a heating resistance wire, one end of the heat-resistant wire is connected to the power supply, and the other end extends into the dust removal and denitrification chamber, the heating resistance wire passes through the high-temperature resistant dust removal pipe cavity, and the two ends are respectively connected to the heat-resistant wire, the backblowing system includes a high-pressure air bag, a pulse control valve, a backblowing main pipe, a backblowing branch pipe, and a backblowing head, the pulse control valve is located on the backblowing main pipe, the backblowing main pipe extends into the clean air chamber, one end of the backblowing branch pipe is connected to the backblowing main pipe, and the other end passes through the flower plate and extends into the dust removal and denitrification chamber, and the backblowing head is installed on the backblowing branch pipe.
[0005] Furthermore, a purified gas outlet is provided on one side of the clean air chamber.
[0006] Furthermore, the outer wall of the dust removal and denitrification chamber is provided with an insulation layer, and the thickness of the insulation layer is 10-20 cm.
[0007] Furthermore, a waste liquid incineration flue gas inlet is provided on one side of the ash hopper, and an ash discharge port is provided at the bottom.
[0008] Furthermore, there are multiple back-blowing branch pipes, which are evenly distributed between the high-temperature dust removal pipes, and there are multiple back-blowing heads, which are evenly distributed on the back-blowing branch pipes from top to bottom.
[0009] Furthermore, there are multiple ammonia spray heads, which are evenly distributed in the ammonia spray pipe.
[0010] Furthermore, the high temperature resistant dust removal tube is made of one of metal sintered felt, ceramic sintered membrane tube or metal woven mesh, and has a thickness of 1-3 mm.
[0011] Furthermore, the denitration catalyst is a granular V2O5-WO3(MoO3) / TiO2 catalyst.
[0012] The above-mentioned integrated denitration and dust removal process for the integrated denitration and dust removal device for waste liquid incineration flue gas comprises the following steps: Step 1: the waste liquid incineration flue gas enters from the waste liquid incineration flue gas inlet on one side of the ash hopper, and ammonia enters from the ammonia spray pipe, and is sprayed into the dust removal and denitrification room by the ammonia spray head to mix with the flue gas; Step 2: Dust particles in the flue gas are intercepted by the surface of the high-temperature dust removal pipe, and the gas passes through the high-temperature dust removal pipe and contacts the denitration catalyst. Nitrogen oxides and ammonia react under the action of the catalyst, and the clean gas enters the clean air chamber and is discharged; Step 3: Regeneration of the high temperature dust removal pipe. After a period of operation, the compressed gas enters the backflush branch pipe from the backflush main pipe, and is sprayed out between the high temperature dust removal pipes through the backflush head, blowing the intercepted particles into the ash hopper for discharge; Step 4: Regeneration of the denitrification catalyst. After running for a period of time, the catalyst regeneration system is turned on. The heating resistor wire in the high-temperature resistant dust removal pipe is heated up to heat and regenerate the denitrification catalyst.
[0013] Furthermore, in the step three, the regeneration period of the high temperature resistant dust removal pipe is 2-4 hours, and the regeneration period of the denitration catalyst is 30-50 days.
[0014] The present invention discloses an integrated denitration and dust removal device and process for waste liquid incineration flue gas. The waste liquid incineration flue gas enters the device at high temperature, first passes through a high temperature resistant dust removal pipe to remove the eye particles and smoke dust in the flue gas, and the clean flue gas penetrates into the high temperature resistant dust removal pipe, contacts with the denitration catalyst, and a denitration reaction occurs. The catalyst is filled in the cavity of the high temperature resistant dust removal pipe. Compared with the ordinary catalytic ceramic membrane that loads the denitration catalyst on the ceramic membrane support, the high temperature resistant dust removal pipe can be reduced, the running resistance can be reduced, and after running for a period of time, the denitration catalyst can be regenerated by heating through the heating resistance wire set in the high temperature resistant dust removal pipe, ensuring that the catalyst always runs efficiently and stably. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the structure of the integrated denitration and dust removal device for waste liquid incineration flue gas according to the present invention; Figure 2 This is a schematic diagram of the structure of the high temperature resistant dust removal pipe according to the present invention; Figure 3 This is a schematic diagram of the bottom support frame structure of the present invention.
[0016] Among them, 1- hazardous waste drying kiln, 2- cracking furnace, 3- high temperature dust collector, 4- ash conveying device, 5- ash storage, 6- secondary combustion chamber, 7- waste heat boiler, 8- high temperature fan, 101- drying belt, 102- high temperature flue gas inlet, 103- flue gas outlet, 104- hazardous waste inlet, 105- hazardous waste outlet, 301- upper box, 302- dust removal chamber, 303- ash hopper, 3011- high temperature clean gas outlet, 3021- high temperature resistant dust removal element, 3031- high temperature flue gas inlet, 3032- smoke dust discharge port, 3033- rotary discharge valve. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0018] like Figure 1-Figure 3 As shown, an integrated denitration and dust removal device for waste liquid incineration flue gas comprises a clean air chamber 1, a dust removal and denitration chamber 2, an ash hopper 3, an ammonia injection system 4, a catalyst regeneration system 5, and a backflush system 6, wherein the clean air chamber 1 is located at the upper part of the dust removal and denitration chamber 2, the ash hopper 3 is located at the lower part of the dust removal and denitration chamber 2, a purified gas outlet 101 is provided on one side of the clean air chamber 1, an insulation layer is provided on the outer wall of the dust removal and denitration chamber 2, and the thickness of the insulation layer is 10-20 cm, a waste liquid incineration flue gas inlet 301 is provided on one side of the ash hopper 3, and an ash discharge port 302 is provided at the bottom; The dust removal and denitration chamber 2 includes a flower plate 201, a bottom support frame 202, a high temperature resistant dust removal pipe 203, and a denitration catalyst 204. The flower plate 201 is located at the top of the dust removal and denitration chamber 2 and is provided with a flower plate hole 2011. The bottom support frame 202 is located at the bottom of the dust removal and denitration chamber 2 and is provided with a positioning groove 2021. The high temperature resistant dust removal pipe 203 is a straight pipe that passes through from top to bottom, and is provided with an expansion end 2031 at the top, which is suspended on the flower plate hole 2011, and the bottom is fixed to the positioning groove 2021. The denitration catalyst 204 is filled in the cavity of the high temperature resistant dust removal pipe 203. The material of the high temperature resistant dust removal pipe 203 is one of metal sintered felt, ceramic sintered membrane tube or metal woven mesh, and the thickness is 1-3mm; the denitration catalyst 204 is a granular V2O5-WO3(MoO3) / TiO2 catalyst; The ammonia injection system 4 includes an ammonia injection control valve 401, an ammonia injection pipe 402, and an ammonia injection head 403. The ammonia injection control valve 401 is installed on the ammonia injection pipe 402. The ammonia injection pipe 402 extends into the ash hopper 3 and bends vertically upward to extend into the upper part of the dust removal and denitration chamber 2. The ammonia injection head 403 is located on the ammonia injection pipe 402 extending into the dust removal and denitration chamber 2. There are multiple ammonia injection heads 403, which are evenly distributed on the ammonia injection pipe 402. The catalyst regeneration system 5 includes a power supply 501, a heat-resistant wire 502, and a heating resistance wire 503. One end of the heat-resistant wire 502 is connected to the power supply, and the other end extends into the dust removal and denitration chamber 2. The heating resistance wire 503 passes through the cavity of the high-temperature dust removal pipe 203, and the two ends are respectively connected to the heat-resistant wire 502; The backblowing system 6 includes a high-pressure air bag 601, a pulse control valve 602, a backblowing main pipe 603, a backblowing branch pipe 604, and a backblowing head 605. The pulse control valve 602 is located on the backblowing main pipe 603, the backblowing main pipe 603 extends into the clean air chamber 1, one end of the backblowing branch pipe 604 is connected to the backblowing main pipe 603, and the other end passes through the flower plate 2 and extends into the dust removal and denitrification chamber 2. The backblowing head 605 is installed on the backblowing branch pipe 604. There are multiple backblowing branch pipes 604, which are evenly distributed between the high-temperature dust removal pipes 203. There are multiple backblowing heads 605, which are evenly distributed on the backblowing branch pipe 604 from top to bottom.
[0019] The above-mentioned integrated denitration and dust removal process for the integrated denitration and dust removal device for waste liquid incineration flue gas comprises the following steps: Step 1: the waste liquid incineration flue gas enters from the waste liquid incineration flue gas inlet 301 on one side of the ash hopper 3, and ammonia enters from the ammonia spray pipe 402, and is sprayed into the dust removal and denitration chamber 2 by the ammonia spray head to mix with the flue gas; Step 2: Dust particles in the flue gas are intercepted by the surface of the high temperature resistant dust removal pipe 203, and the gas passes through the high temperature resistant dust removal pipe 203 and contacts the denitration catalyst 204, and nitrogen oxides and ammonia react under the action of the catalyst, and the clean gas enters the clean air chamber 1 and is discharged; Step 3: Regeneration of the high temperature dust removal pipe. After a period of operation, the compressed gas enters the back-blowing branch pipe 604 from the back-blowing main pipe 603, and is sprayed out between the high temperature dust removal pipes 203 through the back-blowing head 605, blowing the intercepted particles into the ash hopper for discharge. The regeneration cycle of the high temperature dust removal pipe is 2-4 hours. Step 4, regeneration of the denitration catalyst. After running for a period of time, the catalyst regeneration system 5 is turned on, and the heating resistor wire 503 in the high-temperature resistant dust removal pipe 203 is heated to heat and regenerate the denitration catalyst. The regeneration period of the denitration catalyst is 30-50 days.
[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An integrated denitrification and dust removal device for waste liquid incineration flue gas, characterized in that: It includes a clean air chamber, a dust removal and denitration chamber, an ash hopper, an ammonia injection system, a catalyst regeneration system, and a backflush system. The clean air chamber is located at the upper part of the dust removal and denitration chamber, and the ash hopper is located at the lower part of the dust removal and denitration chamber. The dust removal and denitration chamber includes a flower plate, a bottom support frame, a high-temperature resistant dust removal pipe, and a denitration catalyst. The flower plate is located at the top of the dust removal and denitration chamber and is provided with a flower plate hole. The bottom support frame is located at the bottom of the dust removal and denitration chamber and is provided with a positioning groove. The high-temperature resistant dust removal pipe is a straight pipe that runs through the top and the top is provided with an expansion end, which is suspended on the flower plate hole and the bottom is fixed to the positioning groove. The denitration catalyst is filled in the cavity in the high-temperature resistant dust removal pipe. The ammonia injection system includes an ammonia injection control valve, an ammonia injection pipe, and an ammonia injection head. The ammonia injection control valve is installed on the ammonia injection pipe. The ammonia spray pipe extends into the ash hopper and bends vertically upward to extend into the upper part of the dust removal and denitrification chamber. The ammonia spray head is located on the ammonia spray pipe extending into the dust removal and denitrification chamber. The catalyst regeneration system includes a power supply, a heat-resistant wire, and a heating resistance wire. One end of the heat-resistant wire is connected to the power supply, and the other end extends into the dust removal and denitrification chamber. The heating resistance wire passes through the cavity of the high-temperature resistant dust removal pipe, and both ends are respectively connected to the heat-resistant wire. The backblowing system includes a high-pressure air bag, a pulse control valve, a backblowing main pipe, a backblowing branch pipe, and a backblowing head. The pulse control valve is located on the backblowing main pipe, the backblowing main pipe extends into the clean air chamber, one end of the backblowing branch pipe is connected to the backblowing main pipe, and the other end passes through the flower plate and extends into the dust removal and denitrification chamber. The backblowing head is installed on the backblowing branch pipe.
2. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: A purified gas outlet is provided on one side of the clean gas chamber.
3. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: The outer wall of the dust removal and denitrification chamber is provided with a heat-insulating layer, and the thickness of the heat-insulating layer is 10-20cm.
4. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: A waste liquid incineration smoke inlet is provided on one side of the ash hopper, and an ash discharge port is provided at the bottom.
5. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: There are multiple back-blowing branch pipes, which are evenly distributed between the high-temperature dust removal pipes; there are multiple back-blowing heads, which are evenly distributed on the back-blowing branch pipes from top to bottom.
6. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: There are multiple ammonia spray heads, which are evenly distributed in the ammonia spray pipe.
7. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: The high temperature resistant dust removal tube is made of one of metal sintered felt, ceramic sintered film tube or metal woven mesh, and has a thickness of 1-3 mm.
8. The integrated denitrification and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: The denitration catalyst is a granular V2O5-WO3(MoO3) / TiO2 catalyst.
9. The integrated denitration and dust removal process for the integrated denitration and dust removal device for waste liquid incineration flue gas according to claim 1, characterized in that: The following steps are involved: Step 1: the waste liquid incineration flue gas enters from the waste liquid incineration flue gas inlet on one side of the ash hopper, and ammonia enters from the ammonia spray pipe, and is sprayed into the dust removal and denitrification room by the ammonia spray head to mix with the flue gas; Step 2: Dust particles in the flue gas are intercepted by the surface of the high-temperature dust removal pipe, and the gas passes through the high-temperature dust removal pipe and contacts the denitration catalyst. Nitrogen oxides and ammonia react under the action of the catalyst, and the clean gas enters the clean air chamber and is discharged; Step 3: Regeneration of the high temperature dust removal pipe. After a period of operation, the compressed gas enters the backflush branch pipe from the backflush main pipe, and is sprayed out between the high temperature dust removal pipes through the backflush head, blowing the intercepted particles into the ash hopper for discharge; Step 4: Regeneration of the denitrification catalyst. After running for a period of time, the catalyst regeneration system is turned on. The heating resistor wire in the high-temperature resistant dust removal pipe is heated up to heat and regenerate the denitrification catalyst.
10. The integrated denitration and dust removal process according to claim 9, characterized in that: In the step three, the regeneration period of the high temperature resistant dust removal pipe is 2-4 hours, and the regeneration period of the denitration catalyst is 30-50 days.