CN218307151U - Hazardous waste incineration flue gas treatment equipment - Google Patents
Hazardous waste incineration flue gas treatment equipment Download PDFInfo
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- CN218307151U CN218307151U CN202220045921.XU CN202220045921U CN218307151U CN 218307151 U CN218307151 U CN 218307151U CN 202220045921 U CN202220045921 U CN 202220045921U CN 218307151 U CN218307151 U CN 218307151U
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- flue gas
- heat boiler
- flue
- reducing agent
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Abstract
The utility model relates to a danger is useless burns flue gas treatment facility relates to the useless processing apparatus field of danger, including exhaust-heat boiler and denitrification facility, have the flue in the exhaust-heat boiler, denitrification facility is fixed in the flue, and is located exhaust-heat boiler's well upper portion, and denitrification facility includes a plurality of shower nozzles, and the injection direction of shower nozzle is opposite with the flow direction of flue gas, and the shower nozzle is used for spraying the reductant. The utility model has the advantages that: the denitration device is arranged in the waste heat boiler, so that the equipment space is saved, the spray head and the flue gas are reversely sprayed, and the reducing agent is contacted with the flue gas to form a strong turbulence area, so that the reducing agent is fully contacted and reacted with the nitrogen oxide in the flue gas, and the nitrogen oxide in the flue gas is fully removed. The temperature of the upper part of the middle part of the waste heat boiler is about 850 ℃, and the waste heat boiler is suitable for denitration reaction.
Description
Technical Field
The utility model relates to a useless processing apparatus field of danger, concretely relates to danger is useless burns flue gas treatment facility.
Background
The burning treatment process of the main hazardous waste needs high temperature of 1100 ℃ to treat the hazardous waste and decompose the hazardous waste, and a large amount of nitrogen oxides are generated by air combustion supporting. To reduce NO X And (4) discharging, and removing nitrogen oxides.
The existing denitration device is usually independently arranged, the occupied space of the equipment is large, the denitration device is arranged at the outlet of the waste heat boiler, the flue gas temperature is lower, the temperature of SNCR (selective non-catalytic reduction) reaction is insufficient, and a heating device is also needed. Part of the denitration devices are integrated in the preheating boiler, but the problems of low denitration efficiency, large consumption of reducing agent, high equipment operation cost and the like exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is how to improve denitration efficiency.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a dangerous useless flue gas treatment equipment that burns, includes exhaust-heat boiler and denitrification facility, the flue has in the exhaust-heat boiler, denitrification facility is fixed in the flue, and be located exhaust-heat boiler's well upper portion, denitrification facility includes a plurality of shower nozzles, the injection direction of shower nozzle with the flow direction of flue gas is opposite, the shower nozzle is used for spraying the reductant.
The utility model has the advantages that: the denitration device is arranged in the waste heat boiler, so that the equipment space is saved, the spray head and the flue gas are reversely sprayed, and the reducing agent is contacted with the flue gas to form a strong turbulence area, so that the reducing agent is fully contacted and reacted with the nitrogen oxide in the flue gas, and the nitrogen oxide in the flue gas is fully removed. The temperature of the upper part of the middle part of the waste heat boiler is about 850 ℃, and the waste heat boiler is suitable for denitration reaction.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, a plurality of the spray heads are symmetrically arranged on two opposite side walls of the flue.
The beneficial effect of adopting the further scheme is that: the spray heads are uniformly distributed, so that all the flue gas can fully react.
Further, the inlet of the flue is positioned at the upper part of the waste heat boiler.
Further, flue gas in the flue enters the denitration device from top to bottom, and the spraying direction of the spray head is obliquely upward and faces the center of the flue.
The beneficial effect of adopting the above further scheme is: the reducing agent has long residence time in the air and is more fully contacted and reacted with the flue gas.
The device further comprises a reducing agent pipeline, a controller and a nitrogen oxide concentration sensor, wherein a reducing agent valve is arranged on the reducing agent pipeline, the outlet of the reducing agent pipeline is communicated with a plurality of spray heads respectively, the controller is communicated with the reducing agent valve, the nitrogen oxide concentration sensor and the spray heads respectively, and the nitrogen oxide concentration sensor is used for detecting the nitrogen oxide concentration at the outlet of the waste heat boiler.
The beneficial effect of adopting the above further scheme is: the controller can control the opening of the reducing agent valve and the opening number of the spray heads according to the concentration of the nitrogen oxides in the flue, so that the waste of the reducing agent is reduced.
Further, the spray head is an atomizing nozzle.
The beneficial effect of adopting the further scheme is that: the reducing agent has good atomization effect and low consumption.
The rotary kiln comprises a rotary kiln body, a first combustion chamber and a second combustion chamber, wherein an outlet of the rotary kiln body is communicated with an inlet of the first combustion chamber, and an outlet of the second combustion chamber is communicated with an inlet of the flue.
The beneficial effect of adopting the further scheme is that: and (3) burning the hazardous waste by adopting a rotary kiln, and burning and treating dioxin in the flue gas by a secondary combustion chamber and then feeding the flue gas into a waste heat boiler.
Further, still include the desulfurizing tower, the export of flue with the import of desulfurizing tower intercommunication.
The beneficial effect of adopting the further scheme is that: the desulfurizing tower is used for desulfurizing the flue gas.
Further, the reducing agent is urea.
The beneficial effect of adopting the further scheme is that: compared with ammonia, the urea adopted as the reducing agent is safer, more reliable and more economical.
Drawings
FIG. 1 is a schematic diagram of the hazardous waste incineration flue gas treatment equipment of the present invention;
FIG. 2 is a front view of the arrangement structure of the nozzles in the flue according to the present invention;
fig. 3 is a top view of the arrangement structure of the nozzles in the flue according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a rotary kiln; 2. a second combustion chamber; 3. a waste heat boiler; 4. a denitration device; 5. a desulfurizing tower; 6. and (4) a spray head.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1-3, this embodiment provides a dangerous useless incineration flue gas treatment facility, including exhaust-heat boiler 3 and denitrification facility 4, exhaust-heat boiler 3 has the flue in, denitrification facility 4 is fixed in the flue, and is located exhaust-heat boiler 3's well upper portion, denitrification facility 4 includes a plurality of shower nozzles 6, the injection direction of shower nozzle 6 with the flow direction of flue gas is opposite, shower nozzle 6 is used for spraying the reductant.
The denitration device 4 is arranged in the waste heat boiler 3, so that the equipment space is saved, the spray head 6 and the flue gas are reversely sprayed, and the reducing agent is contacted with the flue gas to form a strong turbulence area, so that the reducing agent is fully contacted with and reacts with the nitrogen oxide in the flue gas, and the nitrogen oxide in the flue gas is fully removed. The temperature of the upper part of the middle part of the waste heat boiler 3 is about 850 ℃, which is suitable for denitration reaction.
Specifically, the denitration device 4 mainly selects a position near the upper middle of the exhaust-heat boiler 3, and the temperature of the position is about 850 degrees centigrade, which is only a schematic diagram shown in fig. 1, and if the temperature of the exhaust-heat boiler 3 near the outlet is about 850 degrees centigrade, the denitration device can also be arranged near the outlet. Typically the 850 degrees celsius location within the stack is in the middle of the stack. The flue in the exhaust-heat boiler 3 may be a pipe, or as shown in fig. 1, the inside of the exhaust-heat boiler 3 is divided into continuous channels by partition boards. Other specific structures in the exhaust-heat boiler 3 are the prior art.
The spraying direction of the spray head 6 is opposite to the flowing direction of the flue gas, the flue gas can move from top to bottom, and the spraying direction of the spray head 6 is sprayed from bottom to top; alternatively, the flue gas may move from bottom to top, and the spraying direction of the spray head 6 is from top to bottom.
On the basis of the scheme, as shown in fig. 2 and 3, a plurality of spray heads 6 are symmetrically arranged on two opposite side walls of the flue.
The spray heads 6 are uniformly distributed, so that all the flue gas can fully react. The high-efficient denitration of SNCR is guaranteed, and ammonia escape is avoided.
Specifically, the plurality of spray heads 6 are divided into two groups, the two groups of spray heads 6 are symmetrically arranged on two opposite side walls of the flue, and the plurality of spray heads 6 in each group are uniformly distributed along the side wall of the flue.
As shown in fig. 3, the cross section of the flue may be rectangular or circular.
In a specific embodiment shown in fig. 3, the number of the spray heads 6 is 6, and 3 spray heads 6 are arranged in one group, and two groups are symmetrically arranged.
On the basis of the scheme, the inlet of the flue is positioned at the upper part of the waste heat boiler 3.
On the basis of the scheme, the flue gas in the flue enters the denitration device 4 from top to bottom, and the spraying direction of the spray head 6 is obliquely upward and faces the center of the flue.
In this embodiment, the flue gas moves from top to bottom, the reducing agent moves from bottom to top, and the direction of the reducing agent sprayed vertically upward or obliquely upward can be considered to be opposite to the flow direction of the flue gas. Preferably, the spray direction of the spray head 6 is sprayed obliquely upwards, so that the arrangement and fixation of the spray head 6 are facilitated, the residence time of the reducing agent in the air is long, and the reducing agent is contacted with the flue gas and reacts more fully.
On the basis of the scheme, the device further comprises a reducing agent pipeline, a controller and a nitrogen oxide concentration sensor, a reducing agent valve is arranged on the reducing agent pipeline, the outlet of the reducing agent pipeline is communicated with the spray nozzles 6 in number, the controller is communicated with the reducing agent valve, the nitrogen oxide concentration sensor is communicated with the spray nozzles 6 in number, and the nitrogen oxide concentration sensor is used for detecting the concentration of nitrogen oxide at the outlet of the waste heat boiler 3.
The controller can automatically adjust the opening of the reducing agent valve and the opening number of the spray heads 6 according to the concentration fluctuation of nitrogen oxides in the flue, reduce the waste of the reducing agent and ensure the NO of the denitrated flue gas X The index is always below the emission limit.
Specifically, the nitrogen oxide concentration sensor is used for detecting the concentration of nitrogen oxide at the outlet of the waste heat boiler 3, and when the concentration of nitrogen oxide exceeds a set value, the opening number of the spray nozzles 6 is increased and/or the opening of the reducing agent valve is increased; when the concentration of nitrogen oxides is less than or equal to the set value, the number of the open nozzles 6 and/or the opening of the reducing agent valve can be reduced, the amount of the reducing agent to be ejected can be reduced, and waste can be avoided. In one specific embodiment, as shown in fig. 1, a nitrogen oxide concentration sensor is mounted on the reducing agent valve, and a pipeline at the outlet of the waste heat boiler 3 is communicated with the nitrogen oxide concentration sensor through a detection branch pipe. The line labeled 'NOx' in fig. 1 (i.e., the detection branch) is only used to introduce the gas to be detected to the nitrogen oxide concentration sensor for detection, and the detection branch is not communicated with the reducing agent pipe.
On the basis of the scheme, the spray head 6 is an atomizing nozzle.
The reducing agent has good atomization effect and low consumption.
On the basis of the scheme, the device further comprises a rotary kiln 1 and a secondary combustion chamber 2, wherein an outlet of the rotary kiln 1 is communicated with an inlet of the secondary combustion chamber 2, and an outlet of the secondary combustion chamber 2 is communicated with an inlet of the flue.
The rotary kiln 1 is adopted to burn hazardous waste, and the flue gas is burnt in the secondary combustion chamber 2 to treat dioxin and then enters the waste heat boiler 3.
On the basis of the scheme, the device further comprises a desulfurizing tower 5, and an outlet of the flue is communicated with an inlet of the desulfurizing tower 5. The desulfurizing tower 5 desulfurizes the flue gas.
On the basis of the scheme, the reducing agent is urea.
Compared with ammonia, the urea adopted as the reducing agent is safer, more reliable and more economical.
In the prior art, in order to further reduce the emission of nitrogen oxides by hazardous waste incineration and meet NO in the emission standard of flue gas (hazardous waste incineration pollution control Standard) (GB 18484-2001) X The limit requires that the tail gas must be denitrified. The traditional SNCR denitration is used on a coal-fired boiler, and an SNCR denitration device of the boiler is usually arranged behind a flue gas outlet. And the dangerous waste is treated by adopting a high-temperature burning method, the rotary kiln 1 is used for carrying out burning treatment on the dangerous waste, high-temperature flue gas enters the secondary combustion chamber 2, dioxin is burnt and treated, the residence time of the high-temperature flue gas in the secondary combustion chamber 2 exceeds 2s, the temperature of the flue gas at the outlet of the secondary combustion chamber 2 is more than 1100 ℃, the high-temperature flue gas enters the waste heat boiler 3, the temperature of the flue gas discharged from the waste heat boiler 3 is reduced to 500-550 ℃, the temperature is low, and denitration is difficult to realize.
In this embodiment, the denitration device 4 is arranged in the 850 ℃ range with a temperature suitable for SNCR denitration at the upper part of the middle part of the exhaust- heat boiler 3, 6 nozzles 6 are arranged on both sides of the flue of the exhaust-heat boiler 3, three nozzles 6 on one side are arranged in parallel and symmetrically, and mist of denitration reducing agent is formed inside the exhaust-heat boiler 3The flue gas flows downwards to be in full contact with the reducing agent, the reaction of the nitrogen oxide and the reducing agent in the flue gas is guaranteed, the nitrogen oxide sensor of the flue gas is arranged, and the controller can adjust the opening degree of the reducing agent valve and the opening number of the nozzles 6 according to the concentration of the nitrogen oxide in the flue gas. Guarantee the NO of the denitrated flue gas X The index is always below the emission limit.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. The utility model provides a useless incineration flue gas treatment facility of danger, its characterized in that, includes exhaust-heat boiler (3) and denitrification facility (4), flue has in exhaust-heat boiler (3), denitrification facility (4) are fixed in the flue, and are located the well upper portion of exhaust-heat boiler (3), denitrification facility (4) include a plurality of shower nozzles (6), the injection direction of shower nozzle (6) with the flow direction of flue gas is opposite, shower nozzle (6) are used for spraying the reductant.
2. The hazardous waste incineration flue gas treatment equipment according to claim 1, wherein a plurality of the spray nozzles (6) are symmetrically arranged at two opposite side walls of the flue.
3. The hazardous waste incineration flue gas treatment device according to claim 1, wherein the inlet of the flue is located at the upper part of the waste heat boiler (3).
4. The hazardous waste incineration flue gas treatment equipment according to claim 1, wherein the flue gas in the flue enters the denitration device (4) from top to bottom, and the spraying direction of the spray heads (6) is inclined upwards and towards the center of the flue.
5. The hazardous waste incineration flue gas treatment equipment according to claim 1, further comprising a reducing agent pipeline, a controller and a nitrogen oxide concentration sensor, wherein a reducing agent valve is arranged on the reducing agent pipeline, an outlet of the reducing agent pipeline is respectively communicated with the plurality of spray nozzles (6), the controller is respectively in communication connection with the reducing agent valve, the nitrogen oxide concentration sensor and the plurality of spray nozzles (6), and the nitrogen oxide concentration sensor is used for detecting the nitrogen oxide concentration at an outlet of the waste heat boiler (3).
6. The hazardous waste incineration flue gas treatment device according to any one of claims 1 to 5, wherein the spray head (6) is an atomizing nozzle.
7. The hazardous waste incineration flue gas treatment equipment according to any one of claims 1 to 5, further comprising a rotary kiln (1) and a secondary combustion chamber (2), wherein an outlet of the rotary kiln (1) is communicated with an inlet of the secondary combustion chamber (2), and an outlet of the secondary combustion chamber (2) is communicated with an inlet of the flue.
8. The hazardous waste incineration flue gas treatment equipment according to any one of claims 1-5, further comprising a desulfurization tower (5), wherein the outlet of the flue is communicated with the inlet of the desulfurization tower (5).
9. The hazardous waste incineration flue gas treatment device according to any one of claims 1 to 5, wherein the reducing agent is urea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220045921.XU CN218307151U (en) | 2022-01-07 | 2022-01-07 | Hazardous waste incineration flue gas treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220045921.XU CN218307151U (en) | 2022-01-07 | 2022-01-07 | Hazardous waste incineration flue gas treatment equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218307151U true CN218307151U (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220045921.XU Active CN218307151U (en) | 2022-01-07 | 2022-01-07 | Hazardous waste incineration flue gas treatment equipment |
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| CN (1) | CN218307151U (en) |
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- 2022-01-07 CN CN202220045921.XU patent/CN218307151U/en active Active
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