CN217988925U - Preheating type ammonia water system for SCR denitration of coke oven flue gas - Google Patents
Preheating type ammonia water system for SCR denitration of coke oven flue gas Download PDFInfo
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- CN217988925U CN217988925U CN202221849998.9U CN202221849998U CN217988925U CN 217988925 U CN217988925 U CN 217988925U CN 202221849998 U CN202221849998 U CN 202221849998U CN 217988925 U CN217988925 U CN 217988925U
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- flue gas
- aqueous ammonia
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Abstract
The utility model relates to a coke oven flue gas purification technical field, especially relate to a coke oven flue gas SCR denitration is with preheating-type aqueous ammonia system, including the ammonia injection grid, SCR reactor, booster fan, the chimney that communicate in proper order, still be equipped with one between booster fan and the chimney and communicate the flue gas circulation pipeline of ammonia injection grid, be equipped with circulating fan and ammonia evaporator on the flue gas circulation pipeline; still include ammonia water heat exchanger, ammonia water pump, aqueous ammonia and advance pipe and aqueous ammonia exit tube, the ammonia water heat exchanger is located booster fan with between the SCR reactor, the warp flue gas after the SCR reactor purifies gets into the shell side of ammonia water heat exchanger, and the aqueous ammonia passes through the ammonia water pump and connects the aqueous ammonia advances the pipe and gets into the tube side of ammonia water heat exchanger, via behind the flue gas heating after purifying the aqueous ammonia exit tube is connected the aqueous ammonia import of aqueous ammonia evaporimeter gets into the aqueous ammonia evaporimeter. The utility model discloses reduce recirculation purification gas flow, reduce system power consumption and loss.
Description
Technical Field
The utility model relates to a coke oven gas cleaning technical field especially relates to a coke oven flue gas SCR denitration is with preheating-type ammonia water system.
Background
At present, the tail gas in the coke oven contains a large amount of NO X (800～1200mg/Nm 3 ) The treatment is carried out according to relevant regulation and regulation requirements of China, and the SCR selective catalytic reduction process is adopted in the conventional treatment process at present. The basic process flow is as follows: as shown in figure 2, ammonia water is pressurized by an ammonia water pump and then enters an ammonia water evaporator to be mixed with purified flue gas, and the formed mixture of ammonia gas and flue gas enters an SCR reactor to be catalytically reduced with nitrogen oxides in the coke oven flue gas, so that the aim of reducing the nitrogen oxides is fulfilled. The purified flue gas is generally from the outlet of a booster fan, and the system is provided with a flue gas recirculation fan by considering the ammonia water evaporator and the flue resistance.
The ammonia water prepared by the existing system is at normal temperature, the temperature is about 25 ℃, the heat of evaporation of the ammonia water is completely from purified flue gas pressurized by a flue gas recirculation fan, the purified flue gas enters the SCR reactor again for reaction and is pressurized by a booster fan, and the power consumption of the system and the loss of the SCR reactor are increased. How to reduce the amount of the recycled and purified flue gas and reduce the power consumption and the loss of the system is a concern in the industry at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the technical problem who exists among the prior art. Therefore, the utility model provides a coke oven flue gas SCR denitration of ability reduction recirculation purifies flue gas volume, reduction system power consumption and loss is with preheating-type aqueous ammonia system.
The utility model provides a technical scheme that its technical problem adopted is:
the preheating type ammonia water system for SCR denitration of coke oven flue gas comprises an ammonia injection grid, an SCR reactor, a booster fan and a chimney which are sequentially communicated, wherein a flue gas circulation pipeline communicated with the ammonia injection grid is further arranged between the booster fan and the chimney, and a circulation fan and an ammonia water evaporator are arranged on the flue gas circulation pipeline; still include ammonia water heat exchanger, ammonia water pump, aqueous ammonia and advance pipe and aqueous ammonia exit tube, the ammonia water heat exchanger is located booster fan with between the SCR reactor, the warp flue gas after the SCR reactor purifies gets into the shell side of ammonia water heat exchanger, and the aqueous ammonia passes through the ammonia water pump and connects the aqueous ammonia advances the pipe and gets into the tube side of ammonia water heat exchanger, via behind the flue gas heating after purifying the aqueous ammonia exit tube is connected the aqueous ammonia import of aqueous ammonia evaporimeter gets into the aqueous ammonia evaporimeter.
The utility model provides a coke oven flue gas SCR denitration is with a preferred embodiment of preheating-type aqueous ammonia system, still include aqueous ammonia bypass pipe, the both ends of aqueous ammonia bypass pipe communicate respectively the aqueous ammonia advances pipe and aqueous ammonia exit tube.
In a preferred embodiment of the preheating type ammonia water system for SCR denitration of coke oven flue gas provided by the present invention, the ammonia water inlet pipe, the ammonia water outlet pipe, and the ammonia water bypass pipe are respectively provided with a first isolation valve, a second isolation valve, and a bypass valve.
In the utility model provides a coke oven flue gas SCR denitration is with preheating-type aqueous ammonia system's a preferred embodiment, still be equipped with temperature sensor on the aqueous ammonia exit tube, temperature sensor and the equal signal connection PLC controller of electric signal of circulating fan.
Compared with the prior art, the utility model provides a coke oven flue gas SCR denitration is with preheating-type ammonia water system's beneficial effect is: the utility model discloses a set up the aqueous ammonia heat exchanger on the flue after the purification, the aqueous ammonia passes through the aqueous ammonia heat exchanger heat absorption earlier, reentries the aqueous ammonia evaporimeter, and the aqueous ammonia temperature after the heat absorption rises, has reduced the heat that needs in the aqueous ammonia evaporimeter to reduce the flue gas volume of recirculating, reduced circulating fan's power consumption; after the flue gas releases heat in the ammonia water heat exchanger, the temperature is reduced, the volume flow is reduced, the amount of the recycled flue gas is reduced, the functions of the flue gas and the ammonia water heat exchanger are superposed, the flue gas flow is further reduced, and the power consumption of a booster fan is reduced; the amount of recirculated flue gas is reduced, reducing the amount of flue gas entering the SCR reactor, thereby reducing the losses of the SCR reactor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
FIG. 1 is a schematic structural diagram of a preheating ammonia water system for SCR denitration of coke oven flue gas provided by the utility model;
FIG. 2 is a schematic structural diagram of an ammonia water system for SCR denitration of coke oven flue gas in the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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.
Example one
The embodiment provides a preheating type ammonia water system for SCR denitration of coke oven flue gas, which comprises an ammonia injection grid 1, an SCR reactor 2, a booster fan 3 and a chimney 4 which are sequentially communicated as shown in figure 1, wherein a flue gas circulation pipeline 5 communicated with the ammonia injection grid 1 is further arranged between the booster fan 3 and the chimney 4, and a circulation fan 6 and an ammonia water evaporator 7 are arranged on the flue gas circulation pipeline 5. In order to reduce the amount of recycled and purified flue gas and reduce the power consumption and the loss of a system. This embodiment is in booster fan 3 with it has ammonia water heat exchanger 8 still to design on the flue between the SCR reactor 2, the warp the flue gas after the SCR reactor 2 purifies gets into ammonia water heat exchanger 8's shell side, and the aqueous ammonia advances the pipe 10 entering through ammonia water pump 9 connection aqueous ammonia the pipe side of ammonia water heat exchanger 8 is connected via aqueous ammonia exit tube 11 after the flue gas heating by after purifying the aqueous ammonia import of aqueous ammonia evaporation 7 ware gets into the aqueous ammonia evaporimeter 7 (the aqueous ammonia is spouted into the aqueous ammonia evaporimeter by the aqueous ammonia spray gun, and the aqueous ammonia spray gun is installed in the aqueous ammonia import).
According to the embodiment, the purified flue is provided with the ammonia water heat exchanger, the ammonia water firstly absorbs heat through the ammonia water heat exchanger and then enters the ammonia water evaporator, the temperature of the ammonia water after heat absorption is increased, and the heat required in the ammonia water evaporator is reduced, so that the amount of recycled flue gas is reduced, and the power consumption of the circulating fan is reduced; after the flue gas releases heat in the ammonia water heat exchanger, the temperature is reduced, the volume flow is reduced, the amount of the recycled flue gas is reduced, the functions of the flue gas and the ammonia water heat exchanger are superposed, the flue gas flow is further reduced, and the power consumption of a booster fan is reduced; the amount of recirculated flue gas is reduced, reducing the amount of flue gas entering the SCR reactor, thereby reducing the losses of the SCR reactor.
Preferably, in this embodiment, an ammonia water bypass pipe 12 is further disposed between the ammonia water inlet pipe 10 and the ammonia water outlet pipe 11, and a first isolation valve 13, a second isolation valve 14, and a bypass valve 15 are respectively disposed on the ammonia water inlet pipe 10, the ammonia water outlet pipe 11, and the ammonia water bypass pipe 12. When the ammonia water heat exchanger has a fault, the isolating valves in front of and behind the ammonia water heat exchanger are closed, the bypass valve is opened, and the ammonia water directly enters the ammonia water evaporator through the bypass valve, so that the production stop of the system caused by the fault of the ammonia water heat exchanger is avoided.
Preferably, this embodiment still is equipped with temperature sensor 16 on the aqueous ammonia exit tube for detect the aqueous ammonia temperature after the heat absorption, temperature sensor 16 and 6 equal signal connection PLC controllers (not shown in the figure) of circulating fan, accessible PLC controller realizes the automatically regulated of recirculated flue gas volume according to aqueous ammonia temperature regulation circulating fan's power.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (4)
1. A preheating type ammonia water system for SCR denitration of coke oven flue gas comprises an ammonia injection grid, an SCR reactor, a booster fan and a chimney which are sequentially communicated, wherein a flue gas circulation pipeline communicated with the ammonia injection grid is further arranged between the booster fan and the chimney, and a circulation fan and an ammonia water evaporator are arranged on the flue gas circulation pipeline; the method is characterized in that:
still include ammonia water heat exchanger, ammonia water pump, aqueous ammonia and advance pipe and aqueous ammonia exit tube, the ammonia water heat exchanger is located booster fan with between the SCR reactor, the warp flue gas after the SCR reactor purifies gets into the shell side of ammonia water heat exchanger, and the aqueous ammonia passes through the ammonia water pump and connects the aqueous ammonia advances the pipe and gets into the tube side of ammonia water heat exchanger, via behind the flue gas heating after purifying the aqueous ammonia exit tube is connected the aqueous ammonia import of aqueous ammonia evaporimeter gets into the aqueous ammonia evaporimeter.
2. The coke oven flue gas SCR denitration preheating type ammonia water system of claim 1, wherein: the ammonia water bypass pipe is characterized by further comprising an ammonia water bypass pipe, and two ends of the ammonia water bypass pipe are respectively communicated with the ammonia water inlet pipe and the ammonia water outlet pipe.
3. The coke oven flue gas SCR denitration preheating type ammonia water system of claim 2, wherein: and the ammonia water inlet pipe, the ammonia water outlet pipe and the ammonia water bypass pipe are respectively provided with a first isolation valve, a second isolation valve and a bypass valve.
4. The coke oven flue gas SCR denitration preheating type ammonia water system of claim 1, wherein: still be equipped with temperature sensor on the aqueous ammonia exit tube, temperature sensor and the equal signal of telecommunication connection PLC controller of circulating fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221849998.9U CN217988925U (en) | 2022-07-18 | 2022-07-18 | Preheating type ammonia water system for SCR denitration of coke oven flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221849998.9U CN217988925U (en) | 2022-07-18 | 2022-07-18 | Preheating type ammonia water system for SCR denitration of coke oven flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217988925U true CN217988925U (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221849998.9U Active CN217988925U (en) | 2022-07-18 | 2022-07-18 | Preheating type ammonia water system for SCR denitration of coke oven flue gas |
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| CN (1) | CN217988925U (en) |
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2022
- 2022-07-18 CN CN202221849998.9U patent/CN217988925U/en active Active
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