CN212236709U - SNCR flue gas denitration system of fluidized bed boiler - Google Patents
SNCR flue gas denitration system of fluidized bed boiler Download PDFInfo
- Publication number
- CN212236709U CN212236709U CN202020558161.3U CN202020558161U CN212236709U CN 212236709 U CN212236709 U CN 212236709U CN 202020558161 U CN202020558161 U CN 202020558161U CN 212236709 U CN212236709 U CN 212236709U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- sncr
- reaction solution
- denitration
- gas pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Chimneys And Flues (AREA)
Abstract
The utility model discloses a fluidized bed boiler's SNCR flue gas deNOx systems, including boiler body, cyclone, first flue gas pipeline and denitrification facility, the boiler body with cyclone intercommunication, cyclone's outlet flue is provided with second flue gas pipeline, denitrification facility includes reaction solution accumulator and sprinkler, the reaction solution accumulator with the sprinkler links to each other, the mounting hole has been seted up to second flue gas pipeline, the sprinkler set up in the mounting hole, and with the inner chamber intercommunication of second flue gas pipeline, the first end of first flue gas pipeline with second flue gas pipeline intercommunication, the second end of first flue gas pipeline with boiler body intercommunication. The lower problem of denitration efficiency of present fluidized bed boiler's flue gas denitration system is solved to this scheme.
Description
Technical Field
The utility model relates to a flue gas purification technical field especially relates to a fluidized bed boiler's SNCR flue gas denitration system.
Background
In the field of thermal power plants, fluidized bed boilers generate a large amount of nitrogen oxides during combustion, which not only irritate human respiratory system, damage animals and plants, and destroy ozone layer, but also are one of the main substances causing greenhouse effect, acid rain, and photochemical reaction.
With the improvement of environmental protection requirements, the emission standard of nitrogen oxide pollutants is higher and higher. The flue gas denitration technology can be divided into SCR (Selective Catalytic Reduction) flue gas denitration technology and SNCR (Selective Non-Catalytic Reduction) flue gas denitration technology.
The SNCR flue gas denitration technology has the basic principle that: the reducing agent containing amino, such as ammonia, urea and the like, is sprayed into a flue gas discharge pipeline of the fluidized bed boiler, so that the reducing agent is fully mixed with nitrogen oxide in the flue gas and a nitrogen oxide reduction reaction is carried out, and pollution-free nitrogen and water are generated. Under the general condition, the SNCR flue gas denitration technology has higher requirements on reaction temperature, the optimal reaction temperature range of the SNCR flue gas denitration technology is 850-1100 ℃, and the denitration efficiency of the flue gas is higher in the temperature range.
At present, in the process of denitrating the flue gas in a boiler by an SNCR flue gas denitration technology, a reducing agent is mainly sprayed at a horizontal flue at an inlet of a cyclone separator so as to mix the reducing agent with the flue gas at the inlet of the cyclone separator, thereby removing nitrogen oxides in the flue gas. However, in this case, when the boiler is operated at full load, the flue gas temperature at the inlet of the cyclone is higher than the optimal reaction temperature range of the SNCR flue gas denitration technique, and when the boiler is operated at low load, the flue gas temperature at the inlet of the cyclone is lower than the optimal reaction temperature range of the SNCR flue gas denitration technique, which all results in low flue gas denitration efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a fluidized bed boiler's SNCR flue gas denitration system to solve the lower problem of denitration efficiency of present fluidized bed boiler's flue gas denitration system.
In order to solve the above problem, the utility model adopts the following technical scheme:
the utility model provides a fluidized bed boiler's SNCR flue gas denitration system, includes boiler body, cyclone, first flue gas pipeline and denitrification facility, the boiler body with cyclone intercommunication, cyclone's outlet flue is provided with second flue gas pipeline, denitrification facility includes reaction solution accumulator and sprinkler, the reaction solution accumulator with the sprinkler links to each other, the mounting hole has been seted up to second flue gas pipeline, the sprinkler set up in the mounting hole, and with the inner chamber intercommunication of second flue gas pipeline, the first end of first flue gas pipeline with second flue gas pipeline intercommunication, the second end of first flue gas pipeline with boiler body intercommunication.
The utility model discloses a technical scheme can reach following beneficial effect:
the embodiment of the utility model discloses among fluidized bed boiler's SNCR flue gas denitration system, through setting up the sprinkler in second flue gas pipeline, so that the reaction solution that the sprinkler produced produces nitrogen oxide reduction reaction with the flue gas that cyclone's discharge port discharged, when fluidized bed boiler full load operation, because second flue gas pipeline sets up in cyclone's outlet flue, compare in cyclone's the mouth that advances, cyclone's the flue gas temperature that the outlet flue discharged is lower, so that the flue gas temperature in the second flue gas pipeline can be in the best temperature range of flue gas and reaction solution reaction, so as to improve the reaction rate of nitrogen oxide in the flue gas and reaction solution, and then can improve the denitration efficiency of flue gas.
Meanwhile, when the fluidized bed boiler operates at low load, part of the flue gas discharged by the second flue gas pipeline can be conveyed into the boiler body through the first flue gas pipeline, the temperature of the boiler body can be reduced by the part of the flue gas, and the generation of nitrogen oxides can be inhibited by the temperature reduction in the boiler body; and, the flue gas that lets in the boiler body also can be through the oxygen content in the burning consumption boiler body to can prevent to produce more nitrogen oxide in the boiler body, and then can solve because above-mentioned condition makes the flue gas temperature that the exhaust port of cyclone discharged lower and influence the problem of denitration efficiency of flue gas.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is the embodiment of the utility model discloses fluidized bed boiler's SNCR flue gas deNOx systems's schematic structure diagram.
Description of reference numerals:
100-a boiler body;
200-cyclone separator, 210-second flue gas duct;
300-a first flue gas duct;
410-reaction solution reservoir, 420-sparger, 430-transfer pump, 440-mixer;
500-a dust remover;
600-a draught fan;
700-recirculation fan;
800-primary air blower.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, the embodiment of the utility model discloses a fluidized bed boiler's SNCR (Selective Non-catalytic Reduction) flue gas denitration system, the SNCR flue gas denitration system that discloses includes boiler body 100, cyclone 200, first flue gas pipeline 300 and denitrification facility.
The boiler body 100 is a reaction device of a fluidized bed boiler, and fuel can be combusted in the boiler body 100, so that chemical energy of the fuel is converted into heat energy, and the heat energy required by industrial production and people life can be provided; the heat energy can be converted into mechanical energy, and then the mechanical energy is converted into electric energy through the generator, so that domestic electricity can be provided for users.
The denitration device can remove the nitrogen oxide in the flue gas to prevent the nitrogen oxide in the flue gas from polluting the external environment. The denitrification apparatus includes a reaction solution reservoir 410 and a sprayer 420, the reaction solution reservoir 410 is connected to the sprayer 420, the reaction solution reservoir 410 is capable of supplying a reaction solution, and the reaction solution can be sprayed out through the sprayer 420. When the reaction solution spraying device is installed, the second flue gas pipeline 210 is provided with an installation hole, and the sprayer 420 is arranged in the installation hole and is communicated with the inner cavity of the second flue gas pipeline 210, so that the sprayer 420 can spray the reaction solution to the inner cavity of the second flue gas pipeline 210.
Alternatively, the reaction solution may be a urea solution, the denitration device may further include a mixer 440, an inlet of the mixer 440 may be communicated with the reaction solution storage 410, and an outlet of the mixer 440 may be communicated with the sprayer 420, and during operation, when the urea solution is conveyed to the mixer 440, the mixer 440 may dilute the urea solution into the urea solution with a concentration of about 10%, so as to facilitate spraying by the sprayer 420. Of course, the reaction solution may also be ammonia, which is not limited by the embodiment of the present invention.
The utility model discloses an in the embodiment, the first end and the second flue gas pipeline 210 intercommunication of first flue gas pipeline 300, the second end and the boiler body 100 intercommunication of first flue gas pipeline 300, under this kind of condition, can carry the boiler body 100 in through second flue gas pipeline 210 exhaust part flue gas can pass through first flue gas pipeline 300.
In a specific denitration process, the denitration device can convey the reaction solution to the second flue gas pipeline 210 so that the reaction solution is mixed with the flue gas in the second flue gas pipeline 210, and the reaction solution and nitrogen oxides in the flue gas are subjected to a reduction reaction to generate pollution-free nitrogen and water; further, a part of the flue gas discharged from the second flue gas duct 210 can be conveyed to the boiler body 100 through the first flue gas duct 300 to reduce the amount of nitrogen oxides in the flue gas, and in this case, the nitrogen oxides in the flue gas discharged from the boiler body 100 are less, thereby facilitating the purification treatment of the flue gas.
As can be seen from the above, the embodiment of the utility model discloses an among fluidized bed boiler's the SNCR flue gas denitration system, through setting up sprinkler 420 in second flue gas pipeline 210, so that the reaction solution that sprinkler 420 produced produces nitrogen oxide reduction reaction with the flue gas that cyclone 200's exhaust port discharged, when fluidized bed boiler full load operation, because second flue gas pipeline 210 sets up in cyclone 200's outlet, compare in cyclone 200's the mouth that advances, cyclone 200's the flue gas temperature that the outlet discharged is lower, so that the flue gas temperature in second flue gas pipeline 210 can be in the flue gas and the best temperature range of reaction solution, thereby can improve the nitrogen oxide in the flue gas and the reaction solution's reaction rate, and then can improve the denitration efficiency of flue gas.
Meanwhile, when the fluidized bed boiler operates at a low load, part of the flue gas discharged from the second flue gas pipeline 210 can be conveyed into the boiler body 100 through the first flue gas pipeline 300, the temperature of the part of the flue gas in the boiler body 100 can be reduced, and the reduction of the temperature in the boiler body 100 can inhibit the generation of nitrogen oxides; moreover, the flue gas introduced into the boiler body 100 can also consume the oxygen content in the boiler body 100 through combustion, so that more nitrogen oxides can be prevented from being generated in the boiler body 100, and the problem that the denitration efficiency of the flue gas is influenced by the fact that the flue gas temperature discharged from the smoke outlet of the cyclone separator 200 is low due to the above situation can be solved.
The embodiment of the utility model provides an in, SNCR flue gas deNOx systems can also include dust remover 500, and dust remover 500 can communicate with second flue gas pipeline 210. The dust collector 500 can separate dust from the flue gas discharged from the second flue gas duct 210, thereby reducing the amount of dust in the flue gas discharged into the external environment, improving environmental pollution, and improving air quality.
Further, SNCR flue gas denitration system can also include draught fan 600, and draught fan 600 can communicate with the outlet flue of dust remover 500. The draught fan 600 is a device which generates negative pressure through rotation of the impeller and further extracts air from the system, and when the draught fan 600 works, the draught fan 600 can extract flue gas which is dedusted by the deduster 500, so that the smoke exhaust rate is improved.
The embodiment of the utility model discloses SNCR flue gas denitration system can also include recirculation fan 700, and recirculation fan 700 can communicate with first flue gas pipeline 300. The recirculation fan 700 is able to extract a portion of the flue gas emitted by the second flue gas duct 210 so that this portion of the flue gas can be conveyed into the boiler body 100. Under this kind of circumstances, recirculation fan 700 can improve the transport rate of flue gas, and then can improve work efficiency.
Correspondingly, the embodiment of the utility model discloses SNCR flue gas denitration system can also include a fan 800, and a fan 800's air outlet can communicate with recirculation fan 700's air outlet. In this case, in operation, the primary fan 800 can provide wind power to the flue gas during the process of the recirculation fan 700 delivering the flue gas to the boiler body 100, so that the flue gas can be blown into the boiler body 100 relatively quickly, thereby improving the working efficiency. Meanwhile, the primary air fan 800 may also deliver gas into the boiler body 100 to lower the temperature in the boiler body 100, so that generation of nitrogen oxides may be suppressed, and thus, the purification efficiency of flue gas may be improved.
In the embodiment of the present invention, in order to make the reaction solution transported into the second flue gas pipeline 210 fully mix with the flue gas, in an optional scheme, the top of the second flue gas pipeline 210 may be provided with a mounting hole, under this condition, the spraying device 420 may be disposed at the top of the second flue gas pipeline 210, so that the reaction solution sprayed by the spraying device 420 can diffuse downward due to the gravity, so that the reaction solution can better contact with the flue gas in the second flue gas pipeline 210, and further the denitration effect to the flue gas is improved.
In an alternative embodiment, the number of the sprinklers 420 may be multiple, and the second flue gas duct 210 may be provided with mounting holes at intervals corresponding to each sprinkler 420. In this case, the sprayer 420 can spray the reaction solution at a plurality of positions of the second flue gas duct 210 so that the reaction solution can be sufficiently mixed with the nitrogen oxides in the flue gas, thereby being capable of improving the denitration efficiency of the flue gas. Further, the second flue gas duct 210 may be provided with mounting holes corresponding to each sprayer 420 at intervals in the flow direction of the flue gas, so that the flue gas can be in contact with the reaction solution sprayed by the plurality of sprayers 420 for multiple times, and the denitration efficiency of the flue gas can be further improved.
Of course, each sprayer 420 may communicate with the reaction solution reservoir 410 through a branch pipe, and optionally, an on-off valve may be provided on each branch pipe, so that the dosage of the reaction solution flowing into the second flue gas pipe 210 may be controlled by the on-off valve. Specifically, when the fluidized bed boiler is in full-load operation, the nitrogen oxides in the flue gas are more, and the switch valves corresponding to the sprinklers 420 can be opened, so that the denitration efficiency of the flue gas is improved; when the fluidized bed boiler operates at a low load, part of the flue gas discharged from the second flue gas pipeline 210 can be conveyed into the boiler body 100 through the first flue gas pipeline 300, at this time, nitrogen oxides in the boiler body 100 are reduced, and the on-off valves corresponding to part of the sprayers 420 can be closed, so that the loss of the reaction solution is reduced, and further, the cost is reduced.
The utility model discloses an in the embodiment, denitrification facility can also include delivery pump 430, and the inlet of delivery pump 430 can communicate with reaction solution reservoir 410, and the liquid outlet of delivery pump 430 can communicate with sprinkler 420. The transfer pump 430 can provide powered support for the reaction solution so that the reaction solution can be transferred into the second flue gas duct 210 relatively quickly. Meanwhile, the sprayer 420 can better diffuse the reaction solution into the second flue gas duct 210, and the denitration efficiency of the flue gas can be improved.
The embodiment of the utility model discloses an in, denitrification facility can also include control system and flow control valve, and flow control valve can be connected with control system, and flow control valve can set up between reaction solution accumulator 410 and sprinkler 420. In specific working process, control system can control the aperture of flow control valve to can control reaction solution's flow, and then can adjust the flow that gets into the reaction solution in second flue gas pipeline 210 through the running state according to fluidized bed boiler, with the denitration efficiency of the flue gas of improvement in second flue gas pipeline 210, simultaneously, also can prevent to cause reaction solution's waste, with reduce cost.
Further, the denitration device may further include a temperature sensor, the temperature sensor may be disposed on a side wall of the second flue gas duct 210, and the temperature sensor may be connected to the control system. The temperature sensor is capable of detecting the flue gas temperature in the second flue gas duct 210 so that the control system can control the control valve to close or open depending on the flue gas temperature.
The utility model discloses what the key description in the above embodiment is different between each embodiment, and different optimization characteristics are as long as not contradictory between each embodiment, all can make up and form more preferred embodiment, consider that the literary composition is succinct, then no longer describe here.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. An SNCR flue gas denitration system of a fluidized bed boiler is characterized by comprising a boiler body (100), a cyclone separator (200), a first flue gas pipeline (300) and a denitration device, the boiler body (100) is communicated with the cyclone separator (200), a second flue gas pipeline (210) is arranged at a flue gas outlet of the cyclone separator (200), the denitrification apparatus includes a reaction solution reservoir (410) and a sparger (420), the reaction solution reservoir (410) being connected to the sparger (420), the second flue gas pipeline (210) is provided with a mounting hole, the sprayer (420) is arranged in the mounting hole and is communicated with the inner cavity of the second flue gas pipeline (210), the first end of the first flue gas duct (300) is in communication with the second flue gas duct (210), the second end of the first flue gas duct (300) communicates with the boiler body (100).
2. The SNCR flue gas denitration system according to claim 1, further comprising a dust remover (500), wherein the dust remover (500) is in communication with the second flue gas duct (210).
3. The SNCR flue gas denitration system of claim 2, further comprising an induced draft fan (600), wherein the induced draft fan (600) is communicated with a flue gas outlet of the dust remover (500).
4. The SNCR flue gas denitration system according to claim 1, further comprising a recirculation fan (700), wherein the recirculation fan (700) is in communication with the first flue gas duct (300).
5. The SNCR flue gas denitration system of claim 4, further comprising a primary fan (800), wherein an air outlet of the primary fan (800) is communicated with an air outlet of the recirculation fan (700).
6. The SNCR flue gas denitration system of claim 1, wherein the mounting hole is provided at the top of the second flue gas duct (210).
7. The SNCR flue gas denitration system according to claim 1, wherein the number of the sprinklers (420) is plural, and the second flue gas duct (210) is provided with the mounting holes corresponding to each of the sprinklers (420) at intervals.
8. The SNCR flue gas denitration system of claim 1, wherein the denitration apparatus further comprises a transfer pump (430), a liquid inlet of the transfer pump (430) is communicated with the reaction solution reservoir (410), and a liquid outlet of the transfer pump (430) is communicated with the sprayer (420).
9. The SNCR flue gas denitration system of claim 1, wherein the denitration device further comprises a control system and a flow control valve connected with the control system, the flow control valve being disposed between the reaction solution reservoir (410) and the sparger (420).
10. The SNCR flue gas denitration system according to claim 9, wherein the denitration apparatus further comprises a temperature sensor, the temperature sensor is disposed on a side wall of the second flue gas duct (210), and the temperature sensor is connected to the control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020558161.3U CN212236709U (en) | 2020-04-15 | 2020-04-15 | SNCR flue gas denitration system of fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020558161.3U CN212236709U (en) | 2020-04-15 | 2020-04-15 | SNCR flue gas denitration system of fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212236709U true CN212236709U (en) | 2020-12-29 |
Family
ID=74003023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020558161.3U Active CN212236709U (en) | 2020-04-15 | 2020-04-15 | SNCR flue gas denitration system of fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212236709U (en) |
-
2020
- 2020-04-15 CN CN202020558161.3U patent/CN212236709U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203935782U (en) | MSW Incineration Plant low-temperature SCR equipment for denitrifying flue gas | |
| CN106582286B (en) | Flue gas purification device and method | |
| CN112121614A (en) | Stable ultralow emission device and method for solid waste incineration flue gas | |
| CN108636092B (en) | Flue gas desulfurization and denitrification system and method | |
| CN217016043U (en) | Flue gas treatment system | |
| CN110013750B (en) | Device and method for desulfurizing, denitrifying and demercurating based on oxidation method and condensation absorption | |
| CN110975590A (en) | Coal-fired system and method for removing sulfur trioxide and mercury by using modified fly ash | |
| CN212492330U (en) | Active coke combined desulfurization and denitrification system based on pre-oxidation | |
| CN204933244U (en) | NOx removal device in coal-burning power plant's coal-powder boiler flue gas | |
| CN211328808U (en) | Negative pressure flue gas purification device of thermal power plant | |
| CN212236709U (en) | SNCR flue gas denitration system of fluidized bed boiler | |
| CN208340497U (en) | A kind of efficient control device of gas fired-boiler nitrogen oxides | |
| CN208553730U (en) | A kind of flue gas desulfurization and denitrification system | |
| CN111905541A (en) | Pre-oxidation-based active coke combined desulfurization and denitrification system and method | |
| CN216825593U (en) | Coal fired boiler flue gas desulfurization denitration cooperative processing system | |
| CN202962241U (en) | Device for synergistically removing flue gas mercury | |
| CN205288047U (en) | Device that flue gas was handled to non - catalytic selectivity reduction method (SNCR) is used to glass kiln | |
| CN214437469U (en) | Biomass power plant flue gas purification system | |
| CN108452674A (en) | A kind of efficient control device and method of gas fired-boiler nitrogen oxides | |
| CN213348376U (en) | High-efficient SNCR deNOx systems of biomass boiler | |
| CN112426863A (en) | Dry-method double-cloth-bag flue gas purification integrated device for cooperatively treating various pollutants | |
| CN210009815U (en) | Device for removing NOx, SOx and Hg based on oxidation method and coagulation and absorption | |
| CN113332850A (en) | Circulating fluidized bed semi-dry method cooperative demercuration desulfurization and denitrification system and method | |
| CN206730826U (en) | The low-temperature denitration device that a kind of gaseous oxidation combination dry method absorbs | |
| CN206474018U (en) | A kind of smoke eliminator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |