CN202289871U - Low-temperature smoke denitration device for heat-engine plant - Google Patents
Low-temperature smoke denitration device for heat-engine plant Download PDFInfo
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- CN202289871U CN202289871U CN2011203821647U CN201120382164U CN202289871U CN 202289871 U CN202289871 U CN 202289871U CN 2011203821647 U CN2011203821647 U CN 2011203821647U CN 201120382164 U CN201120382164 U CN 201120382164U CN 202289871 U CN202289871 U CN 202289871U
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- denitration
- heating tube
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- flue
- gas
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Abstract
The utility model relates to a low-temperature smoke denitration device for a heat-engine plant, which comprises a catalysis tower internally provided with a denitration gas flue, wherein the bottom of the denitration gas flue is provided with a denitration gas inlet, and the top of the denitration gas flue is provided with a denitration gas outlet. The low-temperature smoke denitration device is characterized in that the denitration gas flue is internally provided with a plurality of heating pipes capable of introducing heating fluid, a denitration catalyst coating is laid on the outer walls of the heating pipes, and an overflow gap capable of enabling denitration gas to flow through is arranged between every two heating pipes. According to the utility model, steam residual heat or smoke residual heat generated after power generation can be used for heating a catalyst, thus low-temperature smoke can be subjected to denitration. In addition, the service life of the catalyst can be prolonged.
Description
Technical field
The utility model relates to a kind of waste gas treatment equipment, especially relates to a kind of coal steam-electric plant smoke low-temperature denitration device.
Background technology
Coal-burning boiler can produce nitrogen oxide (being nitre) in the fired coal combustion process, nitrogen oxide can pollute (acidifying) to environment, and human body is made carcinogen, so must remove.
At present, domestic comparative maturity, widely used gas denitrifying technology are selective catalytic reduction (SCR), and its denitration effect can reach more than 90%.Because the cause of catalyst, the temperature of catalytic reaction just have good effect when 300-400 spends, so be called high temperature catalyst.For satisfying the needs of high temperature catalyst, catalytic reactor generally is contained in the flue place between economizer and the air preheater, and flue gas promptly carries out denitration in high dirt district without dedusting; Form many problems thus; First dust has shortened the service life of catalyst to the grinding and the obstruction of catalyst, its two oxidized back of sulphur and ammonia react are produced nitric acid hydrogen ammonia; Air preheater there is very strong corrosivity, and adheres to be prone on the corrugated plate cause and block and influence heat-transfer effect.To these deficiencies; The inventor is arranged constantly to device; Intention finds some solutions on device, " the selective-catalytic-reduction denitrified equipment of a kind of flue gas " (publication number: improving technology CN201969481U), acoustic wave ash ejector in the flue between beds and economizer for example by name; But just avoid dust lamination in the flue gas on the catalyst layer bed and the gap of catalyst layer bed, be difficult to solve aforementioned disadvantages.A kind of in addition common solution is to be contained in the flue place after the deduster to catalytic reactor, but about this place flue-gas temperature has only 150 to spend, and present low temperature catalyst efficient when practical application is very low, still can't send out the requirement of satisfying denitration; Sometimes carrying out denitration more than also can being heated to the temperature here 300 degree, but, utilizing waste heat to accomplish, heater need be set in addition, then need consume a large amount of energy, forming bigger cost because of exhaust gas volumn is big.
Summary of the invention
The utility model main purpose provides a kind of coal steam-electric plant smoke low-temperature denitration device, and steam waste heat or fume afterheat after its generating capable of using come heatable catalyst, thereby can carry out denitration to low-temperature flue gas.
The above-mentioned technical problem of the utility model mainly is able to solve through following technical proposals: a kind of coal steam-electric plant smoke low-temperature denitration device; Establish the catalysis building of denitration gas flue in comprising, this denitration gas flue bottom is provided with the import of denitration gas, the top is provided with the outlet of denitration gas; It is characterized in that: be provided with some heating tubes that add hot fluid that feed in the described denitration gas flue, this heating tube outer wall is laid with out of stock catalyst coat; Has the ebb interval excessively that can supply out of stock gas to flow through between each heating tube.Heating tube is in the main part in the denitration gas flue, and the trend of flue can be horizontal relatively, also can be tilting, can also be perpendicular put (being the move towards setting of heating tube along flue).In use, with steam or the flue gas after the generating, flow out from import inflow, the outlet of heating tube; When steam or flue gas flow through heating tube; Through the heat transmission, the catalyst attached to the heating tube outer wall is heated, heating-up temperature can reach more than 300 degrees centigrade; Make catalyst reach very soon its operating temperature or more than, thereby make catalyst obtain preferable denitration efficiency.After the catalyst heating, out of stock gas gets into denitration gas flue from the import of denitration gas, passes the ebb interval of crossing between the heating tube, flows out from the outlet of denitration gas; When out of stock gas passes the ebb interval excessively between the heating tube; Ammonia in the flue gas and nitrogen oxide are adsorbed on the catalyst surface; Because measure less; Ammonia and nitrogen oxide temperature are raised to more than 300 degrees centigrade very soon, and they will issue biochemical reaction in the effect of catalyst and generate the discharge of nitrogen G&W.This structure because catalyst is attached to outside the heating tube, has the interior heat of heating tube to heat, so can be arranged on low-temperature space (referring to about 130 degree) denitration, prolongs the service life of catalyst thus.
Heating tube generally need be fixed in the denitration gas flue; Heating tube can pass through various fixed mode, for example structure such as support, suspension rod; As preferably, described heating tube is fixed on several casings; Described casing is fixed in the denitration gas flue.Adopt the fixed form of casing, supporting & stablizing is reliable, and support force is bigger, can bear the impact of bigger out of stock air-flow.
For the ease of making and install, as preferably, every heating tube is divided into plurality of sections, and is separately fixed on each casing; Two ends of casing are provided with cavity, and the two-port of the heating pipeline section in the casing communicates with two cavitys; Adjacent casing is tightly connected through cavity end formation separately, and both cavitys are communicated with.This structure also is convenient to safeguard and maintenance, when the heating tube fault occurring, only needs to change that corresponding section and gets final product, and the structure that casing connects can be dismantled this section heating tube easily.The cavity structure of tank ends can be communicated with the heating tube on the casing easily.
In order to improve out of stock efficient, as preferably, heating tube is several layers from bottom to top in denitration gas flue arranges, comprises some heating tubes in every layer.This structure, every layer is carried out a denitration to out of stock air-flow, thereby makes out of stock gas carry out repeatedly denitration, can significantly improve the denitration rate.
In order further to improve denitration effect, as preferably, the import and export of the heating tube of adjacent layer are set on the contrary.Make the temperature of each one in the flue more approaching.
As preferably, be provided with deflector and fairing at the denitration gas entrance point of denitration gas flue.Out of stock air-flow is more evenly distributed in flue, is beneficial to and improves out of stock effect.
As preferably, described heating tube is steel pipe or copper pipe or aluminum pipe.Can improve the efficiency of heating surface to catalyst.
Therefore, steam waste heat or fume afterheat after the utility model generating capable of using come heatable catalyst, thereby can carry out denitration to low-temperature flue gas; Can prolong the service life of catalyst in addition.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the utility model;
Accompanying drawing 2 is left views of accompanying drawing 1;
Accompanying drawing 3 is vertical views of accompanying drawing 1;
Accompanying drawing 4 is a kind of structural representations of catalyst container;
Accompanying drawing 5 is vertical views of accompanying drawing 4;
Accompanying drawing 6 is A-A cutaway views of accompanying drawing 4
Accompanying drawing 7 is B-B cutaway views of accompanying drawing 5.
The specific embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of the utility model.
Embodiment: a kind of coal steam-electric plant smoke low-temperature denitration of the utility model device; Shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, accompanying drawing 5, accompanying drawing 6, accompanying drawing 7; Establish the catalysis building 5 of denitration gas flue in it comprises, this denitration gas flue bottom is provided with denitration gas import 11, the top is provided with denitration gas outlet 12.Be provided with some heating tubes 34 that feed the external heat fluid in the denitration gas flue, these heating tube 34 outer walls are laid with out of stock catalyst coat 35; Has the ebb interval 36 excessively that can supply out of stock gas to flow through between each heating tube 34.Heating tube is in the main part in the denitration gas flue, and the trend of flue can be horizontal relatively; Also can be tilting; Can also be perpendicular and put (being the move towards setting of heating tube along flue), this paper is illustrated with heating tube 34 lateral direction penetrating denitration gas flues, shown in accompanying drawing 1.
Need to prove, several heating pipeline sections can be installed in each casing.Each casing on every heating tube connects successively, constitutes a casing group 3.The casing group is 3 layers of layout, and every layer has some casing groups, that is all heating tubes 34 in denitration gas flue from bottom to top, be divided into 3 layers of layout, comprise some heating tubes 34 in every layer.The import and export of the heating tube 34 of adjacent layer are set on the contrary.
In use, utilize steam or flue gas after wireway 2 is carried generating, wireway 2 imports end 21 and derives end 22 through it, forms the air-flow conducting with catalysis building 5 and is connected; The importing end 21 of wireway 2 is through isocon 23 shunting experimental process runners 24, and this paper is example with three sub-runners 24, shown in accompanying drawing 2, and three sub-runner 24 corresponding 3 layer box body groups; Import on end 21, each sub-runner 24 valve 7 that opens and closes passage can be set; Steam or flue gas flow into, export and flow out from the import of heating tube 34; When steam or flue gas flow through heating tube,, the catalyst attached to the heating tube outer wall is heated through the heat transmission, make catalyst reach very soon its operating temperature or more than, thereby make catalyst obtain preferable denitration efficiency.Than the mode that catalyst is heated through the external heat device, this programme need not consumed power, and cost is lower.After the catalyst heating, out of stock gas gets into denitration gas flue from the import of denitration gas, passes to cross ebb interval 36 between the heating tube, flows out from the outlet of denitration gas; When out of stock gas passes the ebb interval 36 excessively between the heating tube; Ammonia in the flue gas and nitrogen oxide are because of chemical reaction; And be adsorbed on the catalyst surface; Because measure lessly, very fast temperature can be more than sound channel 300 degree, and they will issue biochemical reaction in the effect of catalyst and generate the nitrogen G&W and discharge.This structure because catalyst is attached to outside the heating tube, has the heating of heat in the heating tube, refers to 130 degree left and right sides denitrations so can be arranged on low-temperature space, can prolong the service life of catalyst.
The basic principle of the utility model is, utilizes heating tube that the catalyst of its outer wall is heated, and makes it reach preferable operating temperature.Both utilized steam waste heat or the fume afterheat after the generating to come heatable catalyst; Can catalyst converter (being heating tube and its surperficial catalyst) be arranged on air preheater (air preheater is to out of stock dedusting) low-temperature space afterwards again, and can prolong the service life of catalyst.
Need to prove, this paper only with preferable mode as illustrating; Under this basic principle; Those skilled in the art can substitute structure wherein or replace; For example the casing among this paper can adopt other structure replacements such as support as the connector and the support member of every heating tube, but under the situation of invention spirit; These simple substitution and displacement still are within the protection domain of the utility model.
Claims (6)
1. coal steam-electric plant smoke low-temperature denitration device is established the catalysis building (5) of denitration gas flue in comprising, this denitration gas flue bottom is provided with denitration gas import (11), the top is provided with denitration gas outlet (12); It is characterized in that: be provided with some heating tubes (34) that add hot fluid that feed in the described denitration gas flue, this heating tube (34) outer wall is laid with out of stock catalyst coat (35); Has the ebb interval (36) excessively that can supply out of stock gas to flow through between each heating tube (34).
2. a kind of coal steam-electric plant smoke low-temperature denitration device according to claim 1 is characterized in that: described heating tube (34) is fixed on several casings (31); Described casing (31) is fixed in the denitration gas flue.
3. a kind of coal steam-electric plant smoke low-temperature denitration device according to claim 2, it is characterized in that: every heating tube (34) is divided into plurality of sections, and is separately fixed on each casing (31); Two ends of casing (31) are provided with cavity (33), and the two-port of the heating pipeline section in the casing (31) communicates with two cavitys (33); Adjacent casing (31) is tightly connected through cavity end formation separately, and both cavitys (31) are communicated with.
4. according to claim 1 or 2 or 3 described a kind of coal steam-electric plant smoke low-temperature denitration devices, it is characterized in that: heating tube (34) is several layers from bottom to top in denitration gas flue arranges, comprises some heating tubes (34) in every layer.
5. a kind of coal steam-electric plant smoke low-temperature denitration device according to claim 4, it is characterized in that: the import and export of the heating tube of adjacent layer (34) are set on the contrary.
6. according to claim 1 or 2 or 3 described a kind of coal steam-electric plant smoke low-temperature denitration devices, it is characterized in that: described heating tube (34) is steel pipe or copper pipe or aluminum pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203821647U CN202289871U (en) | 2011-10-10 | 2011-10-10 | Low-temperature smoke denitration device for heat-engine plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203821647U CN202289871U (en) | 2011-10-10 | 2011-10-10 | Low-temperature smoke denitration device for heat-engine plant |
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| Publication Number | Publication Date |
|---|---|
| CN202289871U true CN202289871U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203821647U Expired - Fee Related CN202289871U (en) | 2011-10-10 | 2011-10-10 | Low-temperature smoke denitration device for heat-engine plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653407A (en) * | 2022-02-28 | 2022-06-24 | 壹科帆(浙江)科技有限公司 | Pillow-shaped corrugated plate type hollow self-heating ultralow-temperature denitration catalyst |
-
2011
- 2011-10-10 CN CN2011203821647U patent/CN202289871U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653407A (en) * | 2022-02-28 | 2022-06-24 | 壹科帆(浙江)科技有限公司 | Pillow-shaped corrugated plate type hollow self-heating ultralow-temperature denitration catalyst |
| CN114653407B (en) * | 2022-02-28 | 2024-04-26 | 壹科帆(浙江)科技有限公司 | Pillow-shaped corrugated plate type hollow self-heating ultralow-temperature denitration catalyst |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20131010 |