CN210097348U

CN210097348U - Intelligent medium-high temperature SCR denitration system

Info

Publication number: CN210097348U
Application number: CN201920671416.4U
Authority: CN
Inventors: 王付刚; 张鹏
Original assignee: Wuxi Dongfang Environmental Engineering Design & Research Institute Co Ltd
Current assignee: Wuxi Dongfang Environmental Engineering Design & Research Institute Co Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-02-21
Anticipated expiration: 2029-05-10

Abstract

The utility model relates to an intelligent deNOx systems technical field provides an intelligent medium and high temperature SCR deNOx systems, including reductant preparation system and denitration reaction system, reductant preparation system includes the delivery wagon, and the delivery wagon is connected with defeated ammonia pipeline, and the other end through connection of defeated ammonia pipeline has unloads the ammonia pump, and the other end through connection of unloading the ammonia pump has two ammonia tanks through first connecting pipe through connection, and the upper end through connection of two ammonia tanks has same shower pipe, and the lower extreme through connection of two ammonia tanks has same second connecting pipe. The utility model overcomes prior art's is not enough, reasonable in design, and compact structure has solved the mixing of current SCR denitration in-process ammonia and flue gas and is not enough even, reduces the problem of denitration effect, and this application has adopted multiple structure combination, has improved the mixing of ammonia and flue gas, and the nitrogen oxide in the flue gas is got rid of better, improves the efficiency of denitration, has very strong practicality.

Description

Intelligent medium-high temperature SCR denitration system

Technical Field

The utility model relates to an intelligent deNOx systems technical field, concretely relates to high temperature SCR deNOx systems in intellectuality.

Background

The denitration principle of SCR (Selective Catalytic Reduction) is as follows: under the action of catalyst, the fume is mixed with ammonia gas so as to reduce the nitrogen oxide in the fume into nitrogen gas and water

With the increasing concept of sustainable development, awareness of environmental protection is also increasing, and during the industrial production, large flue gas is generated, which contains many nitrogen oxides, including N2O, NO2, N2O3, N2O4, N2O5, etc., but mainly NO, NO2 and N2O, which pollute the atmosphere. The nitrogen oxides produced during combustion are primarily NO and NO2, collectively referred to as NOx, along with a quantity of N2O. In most combustion modes, more than 90% of the NO is produced. Since NO is quickly oxidized to NO2 in atmospheric conditions, the NOx concentration is typically expressed in terms of the mass concentration of NO 2. Nitrogen oxides can cause several hazards to the environment: initiating acid rain or acid precipitation; initiating photochemical smog; N2O is a greenhouse gas, greenhouse effect, ozone depletion, and the like.

However, nitrogen oxides are not uniformly mixed with ammonia under the conventional condition, so that the demand of ammonia is increased, the cost is increased, and the denitration efficiency and effect cannot be effectively improved.

Therefore, an intelligent medium-high temperature SCR denitration system is provided.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The not enough to prior art, the utility model provides an intelligent medium-high temperature SCR deNOx systems has overcome the not enough of prior art, reasonable in design, and compact structure has solved the not enough even of mixing of current SCR denitration in-process ammonia and flue gas, reduces the problem of denitration effect, and this application has adopted multiple structure combination, has improved the mixture of ammonia and flue gas, and the better nitrogen oxide of getting rid of in the flue gas improves the efficiency of denitration, has very strong practicality.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

an intelligent medium-high temperature SCR denitration system comprises a reducing agent preparation system and a denitration reaction system, wherein the reducing agent preparation system comprises a delivery wagon, the delivery wagon is connected with an ammonia delivery pipeline, and the other end of the ammonia conveying pipeline is connected with an ammonia unloading pump in a run-through manner, the other end of the ammonia unloading pump is connected with two ammonia tanks in a run-through manner through a first connecting pipe, the upper ends of the two ammonia tanks are connected with the same spray header in a run-through manner, the lower ends of the two ammonia water tanks are communicated with the same second connecting pipe, the other end of the second connecting pipe is communicated with the same ammonia water evaporator, the second connecting pipe is provided with a plurality of parallel delivery pumps, the other end of the ammonia water evaporator is connected with an ammonia-air mixer in a run-through manner, the lower end of the ammonia air mixer is connected with a dilution fan in a run-through manner, the other end of the dilution fan is connected with an air inlet pipe, and the side wall of the ammonia air mixer is connected with a denitration reaction system through a third connecting pipe;

denitration reaction system includes the flue gas entry, the other end through connection of flue gas entry has the heat exchanger, upper end one side through connection of heat exchanger has the flue gas duct, the other end through connection in flue gas duct has denitration reactor, it has the third connecting pipe to link up the grafting on the lateral wall in flue gas duct, be provided with the hot-blast furnace on the lateral wall in flue gas duct, denitration reactor's lower extreme through connection is on the heat exchanger, lower extreme one side through connection of heat exchanger has the main air fan, the air outlet through connection of main air fan has the purified gas discharge pipe.

Further, the reaction tank has been cup jointed on one section that the third connecting pipe is located the flue gas wind channel outer wall, the reaction tank passes through the leg joint on the inner wall of flue gas wind channel outer wall, a plurality of annular wind channels have been seted up on the reaction tank, the third connecting pipe rotates on one section that is located annular wind channel and is connected with the rotating sleeve, and rotates and sheathes in and be connected with a plurality of blades, a plurality of through-holes have been seted up on the rotating sleeve, and set up the venthole that link up each other with the rotating sleeve on the blade.

Further, through connection has the fourth connecting pipe of two symmetries, two on the lateral wall of third connecting pipe all through connection has the fifth connecting pipe on the lateral wall of fourth connecting pipe, the fifth connecting pipe passes the lateral wall of flue gas duct outer wall and extends to the inner chamber of flue gas duct outer wall, a plurality of bleeder vents have been seted up to one of fifth connecting pipe position in flue gas duct outer wall inner chamber, and has cup jointed the ammonia injection grid on the fifth connecting pipe, the ammonia injection grid is connected on the inside wall of flue gas duct outer wall.

Furthermore, a nitrogen oxide detection device is arranged on the purified gas discharge pipe.

Furthermore, one end of the fourth connecting pipe, which is positioned in the third connecting pipe, is connected with a baffle.

Furthermore, the lateral wall of the outer wall of the smoke air duct, which is positioned above the third connecting pipe, is connected with a rectification grating, and the rectification grating is arranged in parallel with the top wall of the outer wall of the smoke air duct.

Furthermore, two combustion-supporting fans are connected in parallel to the air inlet of the hot blast stove.

Furthermore, liquid level meters are arranged on the ammonia water tank and the ammonia water evaporator.

Further, be provided with control panel on the denitration reactor, last display and the control button of being provided with of control panel, and control panel embeds there is the PLC controller.

(III) advantageous effects

1. The embodiment of the utility model provides a high temperature SCR deNOx systems in intellectuality. The method has the following beneficial effects:

2. through simple structure equipment combination, change the ammonia into with the aqueous ammonia fast, improve the availability factor of ammonia, improve the denitration effect then.

3. In order to improve the intensive mixing of nitrogen oxide in ammonia and the flue gas, improve denitration efficiency, be connected with the reaction tank on the inner wall of flue gas wind channel outer wall, it is connected with a plurality of blades to rotate on the third connecting pipe, the venthole has been seted up on the blade, thereby make the ammonia carry the flue gas wind channel through the venthole in, the flue gas promotes the blade and rotates, the ammonia exhaust velocity in the third connecting pipe is accelerated under the effect of centrifugal force, then improve the mixture of ammonia and flue gas, simultaneously along with the blade rotates, make ammonia and flue gas mix more evenly, then improve the denitration effect.

4. In order to improve the mixture of ammonia and flue gas once more, be connected with the fourth connecting pipe on the third connecting pipe, be connected with the fifth connecting pipe on the lateral wall of fourth connecting pipe, the fifth connecting pipe extends to in the inner chamber of flue gas duct outer wall, a plurality of bleeder vents have been seted up on the fifth connecting pipe, and the ammonia injection grid has been cup jointed on the fifth connecting pipe, along with the circulation of ammonia, the ammonia is carried once more in the flue gas duct through fourth connecting pipe and fifth connecting pipe, make the ammonia mix with the flue gas once more under the effect of ammonia injection grid, the mixture of nitrogen oxide in ammonia and the flue gas once more, the denitration efficiency is improved.

5. In order to make the time of ammonia and flue gas contact longer, mix more evenly, the flue gas wind channel outer wall is connected with the rectification grid on being located the lateral wall of third connecting pipe top, and the roof parallel arrangement of rectification grid and flue gas wind channel outer wall, thereby can even air current, thereby makes ammonia and flue gas contact time longer improve the denitration effect.

6. In order to facilitate control and improve the intelligent effect, a control panel is arranged on the denitration reactor, a display and a control button are arranged on the control panel, the control button and the display are used for controlling the start and stop of a plurality of devices such as the ammonia unloading pump, the ammonia water evaporator, the heat exchanger and the like, so that the intelligent control is achieved, and a PLC (programmable logic controller) is arranged in the control panel.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic diagram of a reducing agent preparation system of the present invention;

FIG. 3 is a schematic structural view of a denitration reaction system of the present invention;

FIG. 4 is a schematic view of a partial cross-sectional view of the flue duct structure of the present invention;

fig. 5 is a schematic sectional view of the structure of fig. 4 a-a according to the present invention.

In the figure: the reducing agent preparation system comprises a reducing agent preparation system 1, a conveying vehicle 11, an ammonia unloading pump 12, a first connecting pipe 13, an ammonia water tank 14, a spray water pipe 15, a second connecting pipe 16, a conveying pump 17, an ammonia water evaporator 18, an ammonia air mixer 19, a third connecting pipe 110, a dilution fan 111, a denitration reaction system 2, a flue gas inlet 21, a heat exchanger 22, a flue gas duct 23, a flue gas duct outer wall 231, a reaction tank 232, a rotating sleeve 233, blades 234, a fourth connecting pipe 235, a fifth connecting pipe 236, an ammonia injection grid 237, a rectification grid 238, a denitration reactor 24, a hot blast stove 25, a combustion-supporting fan 251 and a main fan 26.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

Referring to the attached drawings 1-5, an intelligent medium-high temperature SCR denitration system comprises a reducing agent preparation system 1 and a denitration reaction system 2, wherein the reducing agent preparation system 1 mainly adopts the ammonia gas preparation process, the reducing agent preparation system 1 comprises a delivery wagon 11, the delivery wagon 11 is connected with an ammonia pipeline, the other end of the ammonia pipeline is connected with an ammonia unloading pump 12 in a penetrating way, the other end of the ammonia unloading pump 12 is connected with two ammonia tanks 14 in a penetrating way through a first connecting pipe 13, the two ammonia tanks 14 adopt a one-use one-standby way to reduce the generation of emergency, the upper ends of the two ammonia tanks 14 are connected with a same spray water pipe 15 in a penetrating way to play a certain protection role, when ammonia water leaks, the ammonia water can be used for absorbing ammonia gas, the lower ends of the two ammonia tanks 14 are connected with a same second connecting pipe 16 in a penetrating way, the other end of the second connecting pipe 16 is connected with a same ammonia, make the aqueous ammonia evaporation, make things convenient for follow-up use through ammonia water evaporimeter 18, be provided with a plurality of parallelly connected delivery pump 17 on the second connecting pipe 16, a plurality of delivery pump 17 adopt one with one the mode of preparing for equally, the other end through connection of ammonia water evaporimeter 18 has empty blender 19 of ammonia, the lower extreme through connection of empty blender 19 of ammonia has dilution fan 111, the other end of dilution fan 111 is connected with the air-supply line, dilutes the ammonia once more through dilution fan 111, makes the better reaction of nitrogen oxide in ammonia and the flue gas, improves the denitration effect.

As shown in fig. 3, the sidewall of the ammonia-air mixer 19 is connected to a denitration reaction system 2 through a third connecting pipe 110, the denitration reaction system 2 includes a flue gas inlet 21, the other end of the flue gas inlet 21 is connected to a heat exchanger 22 in a penetrating manner, the heat exchanger 22 employs a GGH heat exchanger, the heat of the high-temperature flue gas at the denitration outlet is transferred to the inlet low-temperature flue gas through the heat exchanger 22, so as to reduce energy consumption, one side of the upper end of the heat exchanger 22 is connected to a flue gas duct 23 in a penetrating manner, the other end of the flue gas duct 23 is connected to a denitration reactor 24 in a penetrating manner, a multi-layer catalyst is disposed in the denitration reactor 24, the flue gas is heated through the flue gas duct 23, the mixing of the flue gas and ammonia gas can be improved in the flue gas duct 23, and then the reaction effect is improved under the action of the multi-layer catalyst in the, the side wall of the flue gas duct 23 is provided with a hot blast stove 25 which can heat flue gas in the flue gas duct 23 to reach reaction temperature, the lower end of the denitration reactor 24 is connected to the heat exchanger 22 in a penetrating way, one side of the lower end of the heat exchanger 22 is connected with a main fan 26 in a penetrating way, certain power is provided through the main fan 26, the flue gas flows conveniently, and an air outlet of the main fan 26 is connected with a purified gas discharge pipe in a penetrating way.

In this embodiment, as shown in fig. 4, in order to improve the sufficient mixing of ammonia gas and nitrogen oxide in flue gas and improve the denitration efficiency, a section of the third connecting pipe 110 located in the outer wall 231 of the flue gas duct is sleeved with a reaction tank 232, the reaction tank 232 is connected to the inner wall of the outer wall 231 of the flue gas duct through a bracket, the reaction tank 232 is provided with a plurality of annular air ducts, a section of the third connecting pipe 110 located in the annular air ducts is rotatably connected with a rotating sleeve 233, the rotating sleeve 233 is connected with a plurality of blades 234, the rotating sleeve 233 is provided with a plurality of through holes, and the blades 234 are provided with air outlets that are communicated with the rotating sleeve 233, so that ammonia gas in the third connecting pipe 110 is conveyed into the flue gas duct 23 through the air outlets, the flue gas is moved by the wind force of the main fan 26, the flue gas pushes the blades 234 to rotate, and accelerates the discharge speed of ammonia gas in the third connecting pipe 110 under the, then improve the mixture of ammonia and flue gas, simultaneously along with blade 234 rotates, make ammonia and flue gas mix more evenly, then improve the denitration effect.

In this embodiment, as shown in fig. 4, in order to improve the mixing of the ammonia gas and the flue gas again, two symmetrical fourth connecting pipes 235 are connected to the side wall of the third connecting pipe 110 in a penetrating manner, a fifth connecting pipe 236 is connected to both side walls of the two fourth connecting pipes 235 in a penetrating manner, the fifth connecting pipe 236 passes through the side wall of the outer wall 231 of the flue gas duct and extends into the inner cavity of the outer wall 231 of the flue gas duct, a plurality of air holes are opened at one end of the fifth connecting pipe 236 located in the inner cavity of the outer wall 231 of the flue gas duct, an ammonia injection grid 237 is sleeved on the fifth connecting pipe 236, the ammonia injection grid 237 is connected to the inner side wall of the outer wall 231 of the flue gas duct, along with the circulation of the ammonia gas, the ammonia gas is conveyed into the flue gas duct 23 again through the fourth connecting pipe 235 and the fifth connecting pipe 236, the ammonia gas is mixed with the flue gas, and the denitration efficiency is improved.

In this embodiment, in order to improve the emission standard, a nitrogen oxide detection device is disposed on the purified gas discharge pipe, so as to ensure that the purified gas meets the emission standard.

In this embodiment, in order to make the ammonia gas enter the fourth connecting pipe 235 conveniently, one end of the fourth connecting pipe 235 located in the third connecting pipe 110 is connected with a baffle, so that the ammonia gas can better enter the fourth connecting pipe 235 through the baffle, and the mixing of the ammonia gas and the flue gas in the ammonia injection grid 237 is improved.

In this embodiment, as shown in fig. 4, in order to make the contact time of the ammonia gas and the flue gas longer and the mixing more uniform, a rectification grille 238 is connected to the side wall of the flue gas duct outer wall 231 above the third connecting pipe 110, and the rectification grille 238 is arranged in parallel with the top wall of the flue gas duct outer wall 231, so as to make the flow of the air uniform, and make the contact time of the ammonia gas and the flue gas longer, thereby improving the denitration effect.

In this embodiment, as shown in fig. 3, in order to improve the combustion efficiency of the hot blast stove 25, two combustion fans 251 are connected in parallel to the air inlet of the hot blast stove 25, and the combustion efficiency of the hot blast stove 25 can be improved by the aid of the multiple combustion fans 251, so that the temperature of flue gas is improved more quickly, and the subsequent denitration efficiency is improved.

In this embodiment, as shown in fig. 1 and 2, in order to facilitate checking the amount of the raw material, level gauges are disposed on both the ammonia tank 14 and the ammonia evaporator 18, so as to observe the amount of the raw material and supplement the raw material in time.

In this embodiment, in order to facilitate control and improve the intelligent effect, a control panel is arranged on the denitration reactor 24, a display and a control button are arranged on the control panel, and the control button and the display are used for controlling the start and stop of a plurality of devices such as the ammonia unloading pump 12, the ammonia water evaporator 18 and the heat exchanger 22, so as to achieve intelligent control, and a PLC controller is arranged in the control panel and adopts siemens S7-400.

The electrical components presented in this document are electrically connected to an external master controller and 220 volt mains electricity, and the master controller may be a conventional known device controlled by a computer or the like.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a high temperature SCR deNOx systems in intellectuality, includes reductant preparation system and denitration reaction system, its characterized in that: the reducing agent preparation system comprises a conveying vehicle, the conveying vehicle is connected with an ammonia conveying pipeline, the other end of the ammonia conveying pipeline is connected with an ammonia unloading pump in a penetrating mode, the other end of the ammonia unloading pump is connected with two ammonia water tanks in a penetrating mode through a first connecting pipe, the upper ends of the two ammonia water tanks are connected with the same spraying water pipe in a penetrating mode, the lower ends of the two ammonia water tanks are connected with the same second connecting pipe in a penetrating mode, the other end of the second connecting pipe is connected to the same ammonia water evaporator in a penetrating mode, the second connecting pipe is provided with a plurality of conveying pumps connected in parallel, the other end of the ammonia water evaporator is connected with an ammonia air mixer in a penetrating mode, the lower end of the ammonia air mixer is connected with a dilution fan in a penetrating mode, the other end of the dilution fan is connected with an air inlet pipe;

2. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: the third connecting pipe is located one section of cigarette wind channel outer wall and has cup jointed the reaction tank, the reaction tank passes through the leg joint on the inner wall of cigarette wind channel outer wall, a plurality of annular wind channels have been seted up on the reaction tank, the third connecting pipe rotates on one section that is located annular wind channel and is connected with the rotating sleeve, and rotates and sheathes in and be connected with a plurality of blades, a plurality of through-holes have been seted up on the rotating sleeve, and set up on the blade with rotate the venthole that the cover link up each other.

3. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: the lateral wall of third connecting pipe is gone up through connection and is had the fourth connecting pipe of two symmetries, two all through connection has the fifth connecting pipe on the lateral wall of fourth connecting pipe, the fifth connecting pipe passes the lateral wall of cigarette wind channel outer wall and extends to in the inner chamber of cigarette wind channel outer wall, a plurality of bleeder vents have been seted up to one of fifth connecting pipe position in cigarette wind channel outer wall inner chamber, and has cup jointed on the fifth connecting pipe and spout the ammonia grid, spout the ammonia grid and connect on the inside wall of cigarette wind channel outer wall.

4. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: and a nitrogen oxide detection device is arranged on the purified gas discharge pipe.

5. The intelligent medium-high temperature SCR denitration system of claim 3, wherein: one end of the fourth connecting pipe, which is positioned in the third connecting pipe, is connected with a baffle.

6. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: the lateral wall of the outer wall of the smoke air duct, which is positioned above the third connecting pipe, is connected with a rectification grid, and the rectification grid is arranged in parallel with the top wall of the outer wall of the smoke air duct.

7. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: and the air inlet of the hot blast stove is connected with two combustion-supporting fans in parallel.

8. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: and liquid level meters are arranged on the ammonia water tank and the ammonia water evaporator.

9. The intelligent medium-high temperature SCR denitration system of claim 1, wherein: be provided with control panel on the denitration reactor, last display and the control button of being provided with of control panel, and control panel embeds there is the PLC controller.