CN212691820U - SNCR (selective non-catalytic reduction) denitration and sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas - Google Patents
SNCR (selective non-catalytic reduction) denitration and sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas Download PDFInfo
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- CN212691820U CN212691820U CN202020696308.5U CN202020696308U CN212691820U CN 212691820 U CN212691820 U CN 212691820U CN 202020696308 U CN202020696308 U CN 202020696308U CN 212691820 U CN212691820 U CN 212691820U
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- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000010802 sludge Substances 0.000 title claims abstract description 46
- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000001035 drying Methods 0.000 title claims abstract description 27
- 238000010531 catalytic reduction reaction Methods 0.000 title description 3
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 230000009970 fire resistant effect Effects 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000003054 catalyst Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a flue structure for SNCR denitration of pulverized coal boiler flue gas and heating sludge drying conduction oil, sets up SNCR denitration device in the flue of pulverized coal boiler in the suitable region, can realize the intensive mixing when letting the flue gas that wraps up and hold the reductant flow through wherein, results ideal denitration efficiency; the heat-conducting oil heater pipeline is pre-buried on the basic mechanism unit, so that a heat-conducting oil heating system is simplified, and partial heat energy in high-temperature flue gas is obtained to be used for dry hanging of municipal sludge; the whole design structure is simple, the concentration of NOx in the flue gas before the SCR device is greatly reduced, meanwhile, the energy in the flue gas is obtained through the simple structure to be used for drying the municipal sludge, and good economic benefits and social benefits can be obtained in the aspects of pollutant emission reduction and municipal waste utilization.
Description
Technical Field
The utility model relates to a coal fired boiler environmental protection technology and discarded object innocent treatment field, in particular to are used for pulverized coal fired boiler flue gas SNCR denitration and heating sludge drying conduction oil flue structure.
Background
In order to meet the national requirement of ultralow emission of pollutants (such as NOx) in flue gas discharged by coal-fired units, a pulverized coal boiler generally adopts a Selective Catalytic Reduction (SCR) method to remove NOx, and the method has the problems of high construction cost of a denitration device, high catalyst consumption, catalyst failure or poisoning, high disposal cost of waste catalyst, great potential harm to the environment and the like. If most of NOx can be removed before the flue gas enters the SCR device, the denitration pressure of the downstream SCR device can be effectively relieved, the service life of the SCR catalyst can be prolonged, and good economic and social benefits are generated.
Meanwhile, biomass (such as municipal sludge and the like) is treated by coupling combustion of a coal-fired unit, so that the method is an important method for realizing reduction, recycling and harmlessness of waste biomass; particularly, for urban sludge utilization, flue gas is used for heating heat conduction oil, so that the heat conduction oil and sludge are subjected to non-contact heat exchange drying in a sludge drying machine, and the method is a widely applied sludge drying method. The dried sludge can be used as fuel to enter a pulverized coal boiler for combustion and utilization, thereby achieving the purpose of resource utilization.
Disclosure of Invention
An object of the utility model is to provide a mummification municipal sludge heat exchanger's that is used for pulverized coal boiler flue gas SNCR denitration and heating sludge mummification conduction oil flue structure, and the flue gas denitration that has solved current pulverized coal boiler has that the construction cost is high, catalyst use cost is high to and the mummification municipal sludge heat exchanger's that exists when coal-fired unit coupling burning handles living beings defects such as structure complicacy.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a flue structure for SNCR denitration of pulverized coal boiler flue gas and heating sludge drying heat conduction oil, which comprises a basic mechanism unit for a SNCR denitration device of the flue gas, wherein the basic mechanism unit is arranged at the upstream of an SCR device; the basic mechanism units are provided with a plurality of S-shaped structures and are sequentially arranged in the inner cavity of the flue; a spray gun is arranged above the first basic mechanism unit and is connected with an SNCR reducing agent container; the basic mechanism unit is pre-embedded with a heat conduction oil heater pipeline, and an inlet of the heat conduction oil heater pipeline is connected with a sludge drying system.
Preferably, the basic mechanism unit includes a first baffle and a second baffle, wherein the first baffle and the second baffle are respectively arranged on two side walls of the flue and form an S-shaped channel.
Preferably, the first baffle and the second baffle are identical in structure; the first baffle is of a heat-resistant steel plate structure, and two side faces of the heat-resistant steel plate structure are coated with fire-resistant and wear-resistant material layers.
Preferably, a conduction oil heater pipeline is pre-embedded in the side face of one side of the first baffle and the second baffle, or the conduction oil heater pipelines are pre-embedded in the side faces of the two sides of the first baffle and the second baffle.
Preferably, a first inclined baffle and a second inclined baffle are further arranged in the flue, and inclined angles are arranged between the first inclined baffle and the side wall of the flue and between the second inclined baffle and the side wall of the flue; wherein the first inclined baffle plate is arranged at the upstream of the first basic mechanism unit and is connected with the first basic mechanism unit; the second inclined baffle is disposed downstream of and connected to the last basic mechanism unit.
Preferably, the first inclined baffle and the second inclined baffle are arranged on two side walls of the flue in a mirror image structure; the first inclined baffle and the second inclined baffle are identical in structure, the first inclined baffle is of a heat-resistant steel plate-shaped structure, and two side faces of the heat-resistant steel plate-shaped structure are coated with fire-resistant wear-resistant materials.
Preferably, a spray gun is arranged above the first inclined baffle plate, and an SNCR reducing agent container is connected to the spray gun.
Preferably, a conduction oil heater pipeline is pre-embedded in the side surface of one side of the first inclined baffle and the second inclined baffle; or heat conducting oil heater pipelines are pre-embedded in the side faces of the two sides of the first inclined baffle and the second inclined baffle.
Preferably, the conduction oil heater pipelines are arranged in an S-shaped structure; the inlet of the conduction oil heater pipeline is connected with a conduction oil inlet header; the outlet of the conduction oil heater pipeline is connected with a conduction oil outlet header, and the conduction oil outlet of the conduction oil outlet header is connected with the inlet of the sludge drier; and the outlet of the sludge drier is connected with a heat-conducting oil inlet header.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a flue structure for SNCR denitration of pulverized coal boiler flue gas and heating sludge drying conduction oil, sets up SNCR denitration device in the flue of pulverized coal boiler in the suitable region, can realize the intensive mixing when letting the flue gas that wraps up and hold the reductant flow through wherein, results ideal denitration efficiency; the heat-conducting oil heater pipeline is pre-buried on the basic mechanism unit, so that a heat-conducting oil heating system is simplified, and partial heat energy in high-temperature flue gas is obtained to be used for dry hanging of municipal sludge; the whole design structure is simple, the concentration of NOx in the flue gas before the SCR device is greatly reduced, meanwhile, the energy in the flue gas is obtained through the simple structure to be used for drying the municipal sludge, and good economic benefits and social benefits can be obtained in the aspects of pollutant emission reduction and municipal waste utilization.
Furthermore, the first inclined baffle is arranged, and the flue forms a tapered flue; the second inclined baffle is arranged to form a divergent flue gas channel so as to reduce the flow pressure loss.
Drawings
FIG. 1 is an elevation view of a flue structure according to the present invention;
fig. 2 is a plan view of a flue structure according to the present invention;
FIG. 3 is a block diagram of a baffle;
FIG. 4 is a schematic size diagram of a high-efficiency SNCR denitration device for flue gas of a pulverized coal fired boiler;
FIG. 5 is a diagram of a sludge drying system using flue gas to heat conduction oil.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the utility model provides a be used for SNCR denitration of pulverized coal boiler flue gas and heating sludge drying conduction oil flue structure, including pulverized coal boiler 1, flue 2, first slope baffle 3, first baffle 4, second baffle 5, second slope baffle 6, fire-resistant wear-resisting material 7, heat-resisting steel platelike structure 8, conduction oil heater pipeline 9, control flap 10, conduction oil entry collection case 11, conduction oil export collection case 12, circulating pump 13, sludge drying machine 14, SCR device 15 and spray gun 16, wherein, pulverized coal boiler 1's exhanst gas outlet is connected with flue 2, flue 2's exhanst gas outlet is connected with SCR device 15's exhanst gas inlet.
A first inclined baffle 3, a plurality of basic mechanism units for the high-efficiency SNCR denitration device of the flue gas and a second inclined baffle 6 are sequentially arranged in an inner cavity of the flue 2 from upstream to downstream, wherein the first inclined baffle 3 is connected with the first basic mechanism units; the second inclined baffle 6 is connected to the last basic mechanism unit.
The first inclined baffle 3 and the second inclined baffle 6 are arranged in a mirror image structure.
The first inclined baffle 3 and the second inclined baffle 6 have the same structure, wherein the first inclined baffle 3 comprises a heat-resistant steel plate-shaped structure 8, and both sides of the heat-resistant steel plate-shaped structure 8 are coated with fire-resistant and wear-resistant materials 7.
The basic mechanism unit comprises a first baffle 4 and a second baffle 5, wherein the first baffle 4 and the second baffle 5 form an S-shaped channel.
The first inclined baffle 3 is connected with the first baffle 4; the second inclined baffle 6 is connected to the second baffle 5.
The first baffle 4 and the second baffle 5 have the same structure, wherein the heights of the first baffle 4 and the second baffle are equal; the first baffle 4 comprises a plate-like structure 8 of heat-resistant steel, said plate-like structure 8 being coated on both sides with a layer 7 of refractory and wear-resistant material.
The spacing between two adjacent baffles is equal.
A plurality of lances 16 are arranged above the first inclined baffle 3 or the first baffle 4.
The lance 16 is connected to an SNCR reducing agent container.
A conduction oil heater pipeline 9 with an S-shaped structure is pre-embedded in one side surface of the first inclined baffle 3, the first baffle 4, the second baffle 5 or the second inclined baffle 6, and an inlet of the conduction oil heater pipeline 9 is connected with a conduction oil inlet header 11; the outlet of the conduction oil heater pipeline 9 is connected with a conduction oil outlet header 12, and the conduction oil outlet of the conduction oil outlet header 12 is connected with the inlet of a sludge drier 14 through a circulating pump 13.
The outlet of the sludge drier is connected with a heat-conducting oil inlet header 11 through a control valve 10.
The utility model discloses a work engineering:
a first inclined baffle 3 with a certain angle alpha is arranged at a proper position of a flue 2 of a pulverized coal boiler 1 to form a tapered flue, the middle part of the first inclined baffle 3 is a heat-resistant steel plate-shaped structure 8, and both sides of the first inclined baffle are coated with fire-resistant wear-resistant materials 7 with a certain thickness.
Connected with the first inclined baffle 3 is a first baffle 4, and the first baffle 4 and a second baffle 5 which is arranged oppositely form a basic mechanism unit of the high-efficiency SNCR denitration device for flue gas.
The first baffle 4 and the second baffle 5 are respectively arranged at two sides of the flue 2, and 1-3 basic structural units can be arranged in the flue 2 according to requirements and space conditions.
The tail part of the flue gas SNCR denitration device is connected with a second inclined baffle 6 with a certain angle to form a gradually expanding flue gas flow passage so as to reduce the flowing pressure loss.
In the specific dimension design, the first baffle 4 and the second baffle 5 of the basic mechanism unit for SNCR denitration have the same height H2, the distances H1 and H3 between the baffles and the wall surface of the flue 2 are kept the same, the distances D1 and D2 between the two baffles are also kept the same, and the cross section area of a through-flow area is kept unchanged, so that the pressure loss of flue gas flow can be effectively reduced.
The number and the structural size (H1, H2 and D1 and the angle alpha of the inclined baffle) of the basic structures adopted by the SNCR denitration device can be specifically designed by combining detailed information such as the actual size of a flue, boiler operation parameters and the like.
In order to promote good mixing of the SNCR reducing agent with the flue gases, a number of lances 16 are arranged in suitable regions of the upper part of the first inclined baffle 3 or the first baffle 4 near the wall of the flue 2.
The SNCR reducing agent (such as urea solution, ammonia water, etc.) is atomized by the spray gun 16 and sprayed into the high-speed flowing flue gas, completing evaporation in a short time.
Reducing agent gets into SNCR denitrification facility is being wrapped up in to high-speed flue gas, because the water conservancy diversion effect of first baffle 4 and second baffle 5 isotructure, the flue gas will flow along U type or the type of falling U route in SNCR denitrification facility, has promoted the mixture of flue gas and reducing agent, simultaneously, high-speed flow can form strong recirculation zone in the local region of first baffle 4 and the wall of second baffle 5 perpendicular to flue 2, has further promoted the mixed degree of local region reducing agent and flue gas.
Flue gas and reductant flow through 1 ~ 3 basic mechanism units in SNCR denitrification facility, alright reach effective mixture to the comparatively ideal SNCR denitrification efficiency of results (if exceed 65%), reduced NOx's concentration in the flue gas by a wide margin, alleviated the denitration pressure of low reaches SCR device 15.
In order to prolong the service life of the first baffle plate 4 and the second baffle plate 5, a heat-resistant steel plate-shaped structure 8 (such as 310S stainless steel) can be selected as a baffle plate material, and the two sides of the baffle plate material are covered with a layer 7 of fire-resistant and wear-resistant materials with certain thickness.
The thickness of the heat-resistant steel plate-shaped structure 8 and the thickness of the fire-resistant wear-resistant material layer 7 can be comprehensively designed by combining the conditions of the pulverized coal boiler 1 and the SNCR denitration device.
The first inclined baffle 3 and the second inclined baffle 6 or the first baffle 4 and the second baffle 5 in the flue 2 are higher in the whole environmental smoke temperature, so that the flue can be used as a heat source of heat conducting oil for heating sludge.
The heat conducting oil heater pipeline 9 is embedded in the fireproof wear-resistant material layer 7 of the first inclined baffle 3, the second inclined baffle 6 or the first baffle 4 and the second baffle 5 in a snake-shaped mode, and can be arranged on the windward side of the related baffles independently or on both sides simultaneously.
The specific shape and the burying position of the heat conducting oil heater pipeline 9 need to be specifically designed in combination with the requirements of sludge to be dried. Arrange conduction oil heater pipeline 9 and realize effective heating in refractory wear-resistant material layer 7, avoided the complicated structure change that needs set up the heat exchanger alone in the flue of low reaches promptly, simplified sludge drying system, also make full use of the SNCR denitrification facility's that this patent relates to design structure.
The heat conducting oil is heated in the heat conducting oil heater pipelines 9 and collected to the heat conducting oil outlet header 12, the heat conducting oil is driven by the circulating pump 13, high-temperature heat conducting oil enters the sludge drier 14, is cooled while sludge is dried, flows through the control valve 10, enters the heat conducting oil inlet header 11, and is finally distributed to the heat conducting oil heater pipelines 9 to realize circulating heating.
The utility model discloses suitable region uses simple structure's baffle to found high-efficient SNCR denitrification facility in pulverized coal boiler 1's flue 2, lets wrap up in the flue gas that is holding the reductant and can realize the intensive mixing when wherein flowing through, the denitration efficiency of results ideal.
Meanwhile, a heat conduction oil heater pipeline 9 is arranged in the fireproof wear-resistant material layer 7 of the baffle, a heat conduction oil heating system is simplified, and partial heat energy in high-temperature flue gas is obtained and used for dry-hanging municipal sludge. The whole design structure is simple, the concentration of NOx in the flue gas before the SCR device 15 is greatly reduced, meanwhile, the energy in the flue gas is obtained through the simple structure to be used for drying the municipal sludge, and good economic benefits and social benefits can be obtained in the aspects of pollutant emission reduction and municipal waste utilization.
Claims (9)
1. The SNCR denitration and heating sludge drying heat conduction oil flue structure for the flue gas of the pulverized coal fired boiler is characterized by comprising a basic mechanism unit for a flue gas SNCR denitration device, wherein the basic mechanism unit is arranged at the upstream of an SCR device (15); the basic mechanism units are provided with a plurality of S-shaped structures and are sequentially arranged in the inner cavity of the flue (2); a spray gun (16) is arranged above the basic mechanism unit, and the spray gun (16) is connected with an SNCR reducing agent container; a conduction oil heater pipeline (9) is pre-embedded in the basic mechanism unit, and an inlet of the conduction oil heater pipeline (9) is connected with a sludge drying system.
2. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 1, wherein the basic mechanism unit comprises a first baffle plate (4) and a second baffle plate (5), wherein the first baffle plate (4) and the second baffle plate (5) are respectively arranged on two side walls of the flue (2) and form an S-shaped channel.
3. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 2, wherein the first baffle (4) and the second baffle (5) have the same structure; the first baffle (4) is of a heat-resistant steel plate structure, and two side faces of the heat-resistant steel plate structure are coated with fire-resistant and wear-resistant material layers.
4. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal fired boiler flue gas according to claim 2, characterized in that a heat conduction oil heater pipeline (9) is pre-embedded in the side surface of one side of the first baffle plate (4) and the second baffle plate (5), or a heat conduction oil heater pipeline (9) is pre-embedded in the side surface of both sides of the first baffle plate (4) and the second baffle plate (5).
5. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 1, characterized in that a first inclined baffle (3) and a second inclined baffle (6) are further arranged in the flue (2), and inclined angles are respectively arranged between the first inclined baffle (3) and the side wall of the flue (2) and between the second inclined baffle (6) and the side wall of the flue (2); wherein the first inclined baffle (3) is arranged at the upstream of the first basic mechanism unit and is connected with the first basic mechanism unit; the second inclined baffle (6) is arranged at the downstream of the last basic mechanism unit and is connected with the last basic mechanism unit.
6. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 5, characterized in that the first inclined baffle (3) and the second inclined baffle (6) are arranged on two side walls of the flue (2) in a mirror image structure; the structure of the first inclined baffle (3) is the same as that of the second inclined baffle (6), wherein the first inclined baffle (3) is a heat-resistant steel plate-shaped structure, and two side faces of the heat-resistant steel plate-shaped structure (8) are coated with fire-resistant and wear-resistant materials.
7. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 5, characterized in that a spray gun (16) is arranged above the first inclined baffle (3), and the spray gun (16) is connected with an SNCR reducing agent container.
8. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 5, characterized in that a heat conduction oil heater pipeline (9) is pre-embedded on the side surface of one side of the first inclined baffle (3) and the second inclined baffle (6); or heat conducting oil heater pipelines (9) are pre-embedded in the side faces of the two sides of the first inclined baffle (3) and the second inclined baffle (6).
9. The SNCR denitration and heating sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas according to claim 5, wherein the heat conduction oil heater pipeline (9) is arranged in an S-shaped structure; the inlet of the heat conduction oil heater pipeline (9) is connected with a heat conduction oil inlet header (11); the outlet of the heat conduction oil heater pipeline (9) is connected with a heat conduction oil outlet header (12), and the heat conduction oil outlet of the heat conduction oil outlet header (12) is connected with the inlet of a sludge drier (14); the outlet of the sludge drier is connected with a heat-conducting oil inlet header (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020696308.5U CN212691820U (en) | 2020-04-29 | 2020-04-29 | SNCR (selective non-catalytic reduction) denitration and sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020696308.5U CN212691820U (en) | 2020-04-29 | 2020-04-29 | SNCR (selective non-catalytic reduction) denitration and sludge drying heat conduction oil flue structure for pulverized coal boiler flue gas |
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| CN212691820U true CN212691820U (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425874A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | Flue structure for SNCR (selective non-catalytic reduction) denitration of pulverized coal boiler flue gas and heating sludge drying heat conduction oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425874A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | Flue structure for SNCR (selective non-catalytic reduction) denitration of pulverized coal boiler flue gas and heating sludge drying heat conduction oil |
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