阅读说明：本技术 一种水泥窑scr脱硝反应系统 (Cement kiln SCR denitration reaction system ) 是由 雷嗣远 方朝君 卿梦磊 王乐乐 杨晓宁 孔凡海 姚燕 王凯 鲍强 马云龙 于 2021-07-28 设计创作，主要内容包括：本发明涉及一种水泥窑SCR脱硝反应系统,包括反应器主体、主催化剂单元,反应器主体连接有进口烟道和出口烟道,主催化剂单元设置在反应器主体内,系统还包括第一拦灰单元、第二拦灰单元中的一种或多种,第一拦灰单元设置在进口烟道内,第一拦灰单元设置有允许烟气通过的烟气通道,烟气通道的开口大小可调节；第二拦灰单元设置在反应器主体内位于主催化剂单元的上方,第二拦灰单元设置有允许烟气通过的烟气孔。本发明通过拦灰单元可以高效拦截并运输烟气中飞灰,同时多项措施保证飞灰在经过催化剂之前被清除,延长催化剂使用寿命；拦灰单元结构简单,安装方便,节约成本。(The invention relates to a cement kiln SCR denitration reaction system, which comprises a reactor main body and a main catalyst unit, wherein the reactor main body is connected with an inlet flue and an outlet flue, the main catalyst unit is arranged in the reactor main body, the system also comprises one or more of a first ash blocking unit and a second ash blocking unit, the first ash blocking unit is arranged in the inlet flue, the first ash blocking unit is provided with a flue gas channel allowing flue gas to pass through, and the opening size of the flue gas channel is adjustable; the second ash blocking unit is arranged in the reactor main body and above the main catalyst unit, and is provided with a flue gas hole allowing flue gas to pass through. The fly ash in the flue gas can be efficiently intercepted and transported through the ash blocking unit, and meanwhile, the fly ash is removed before passing through the catalyst by multiple measures, so that the service life of the catalyst is prolonged; the ash blocking unit is simple in structure, convenient to install and cost-saving.)

1. The utility model provides a cement kiln SCR denitration reaction system, includes reactor main part, main catalyst unit, the reactor main part be connected with import flue and export flue, the main catalyst unit set up the reactor main part in, its characterized in that:

the system also comprises one or more of a first ash blocking unit and a second ash blocking unit, wherein the first ash blocking unit is arranged in the inlet flue, the first ash blocking unit is provided with a flue gas channel allowing flue gas to pass through, and the opening size of the flue gas channel is adjustable; the second ash blocking unit is arranged above the main catalyst unit in the reactor main body, and is provided with a flue gas hole allowing flue gas to pass through.

2. The cement kiln SCR denitration reaction system of claim 1, wherein: the first ash blocking unit comprises an ash blocking plate group and an ash blocking driving part, the ash blocking plate group is provided with a plurality of groups, the plurality of groups of ash blocking plate groups are positioned on the same section of the inlet flue and distributed up and down, and the flue gas channel is formed between two adjacent groups of ash blocking plate groups; the ash blocking plate group comprises a first plate body and a second plate body, the opening size of the flue gas channel can be adjusted through relative rotation between the first plate body and the second plate body, and the ash blocking driving part drives the first plate body and the second plate body to rotate relatively.

3. The cement kiln SCR denitration reaction system according to claim 1 or 2, wherein: the first ash blocking unit further comprises a concentration monitor for monitoring the ash concentration in the reactor main body and a differential pressure monitor for monitoring the smoke resistance in the reactor main body, and the ash blocking driving part adjusts the angle between the first plate body and the second plate body according to the monitoring data of the concentration monitor and the differential pressure monitor.

4. The cement kiln SCR denitration reaction system of claim 1, wherein: the second block grey unit include the ash blocking plate, lead grey passageway, the ash blocking plate on seted up the flue gas port, the ash blocking plate recessed formation deposition groove that forms, lead grey passageway upper end communicate respectively the both ends in deposition groove, the lower extreme that leads grey passageway extend to the export flue.

5. The cement kiln SCR denitration reaction system of claim 4, wherein: the second block grey unit still including pushing away grey subassembly, push away grey subassembly be used for with the deposition in the deposition inslot push extremely lead grey passageway in, push away grey subassembly including pushing away the hawk, push away grey driving piece, push away the hawk setting and be in the deposition inslot, push away grey driving piece with push away the hawk and be connected drive its deposition inslot reciprocating motion.

6. The cement kiln SCR denitration reaction system of claim 4, wherein: the second ash blocking unit also comprises ash blowing parts, wherein the ash blowing parts are arranged on two sides of the ash blocking plate and are used for blowing the accumulated ash on the ash blocking plate into the ash accumulating groove.

7. The cement kiln SCR denitration reaction system of claim 1, wherein: the system comprises a first ash hopper and an ash conveying pipe, wherein the first ash hopper is arranged in the inlet flue and positioned at the front part of the first ash blocking unit, one end of the ash conveying pipe is communicated with the first ash hopper, and the other end of the ash conveying pipe is communicated with the outlet flue.

8. The cement kiln SCR denitration reaction system of claim 1, wherein: the top of the reactor body extends downwards from one side of the inlet flue to the opposite side in an inclined manner, the system further comprises a second ash hopper and an ash conveying pipe, the second ash hopper is arranged on the other side, opposite to the inlet flue, of the reactor body, one end of the ash conveying pipe is communicated with the second ash hopper, and the other end of the ash conveying pipe is communicated with the outlet flue.

9. The cement kiln SCR denitration reaction system of claim 1, wherein: the outlet flue is provided with a Venturi vertical pipe section.

10. The cement kiln SCR denitration reaction system of claim 1, wherein: the system also includes an auxiliary catalyst unit disposed within the outlet flue.

Technical Field

The invention belongs to the technical field of SCR denitration, and particularly relates to a cement kiln SCR denitration reaction system.

Background

The pollution of NOx contained in the exhaust gas discharged from the cement kiln to the environment is large, and the NOx is combined with water in the air and finally converted into nitric acid and nitrate, so certain measures must be taken to remove the NOx in the exhaust gas discharged from the cement kiln as much as possible so as to reduce the pollution of the NOx to the environment.

The technical measures to control NOx emissions can be divided into two main categories: the first is so-called source control, which is to control the generation reaction of NOx in the combustion process by various technical means; the other type is so-called tail control, in which NOx that has been formed is reduced to N by some means₂Thereby reducing NOx emissions.

Currently, Selective Catalytic Reduction (SCR) denitration technology is commonly employed in kiln processing in the cement kiln industry to achieve ultra-low NOx emissions. The catalyst is used as a core material of the SCR denitration technology and becomes a main factor for restricting the denitration reaction. The existing process is often subjected to high-ash high-dust arrangement. Because cement manufacture line often the space is limited, import transition flue form is various, can't set up fixed receipts ash device, and cement kiln flying dust concentration is high in addition, for preventing catalyst layer deposition, improves denitration efficiency, sets up soot blower above every layer of catalyst usually, but current soot blower, the structure is complicated, and soot blowing efficiency and effect are relatively poor, need frequent to blow the ash to the kiln and handle, and the effect is not good.

Disclosure of Invention

The invention aims to provide an SCR denitration reaction system of a cement kiln.

In order to achieve the purpose, the invention adopts the technical scheme that:

the cement kiln SCR denitration reaction system comprises a reactor main body and a main catalyst unit, wherein the reactor main body is connected with an inlet flue and an outlet flue, the main catalyst unit is arranged in the reactor main body,

the system also comprises one or more of a first ash blocking unit and a second ash blocking unit, wherein the first ash blocking unit is arranged in the inlet flue, the first ash blocking unit is provided with a flue gas channel allowing flue gas to pass through, and the opening size of the flue gas channel is adjustable; the second ash blocking unit is arranged above the main catalyst unit in the reactor main body, and is provided with a flue gas hole allowing flue gas to pass through.

Preferably, the first ash blocking unit comprises an ash blocking plate group and an ash blocking driving part, the ash blocking plate group is provided with a plurality of groups, the plurality of groups of ash blocking plate groups are positioned on the same section of the inlet flue and distributed up and down, and the flue gas channel is formed between two adjacent groups of ash blocking plate groups; the ash blocking plate group comprises a first plate body and a second plate body, the first plate body and the second plate body can rotate relatively to adjust the opening size of the flue gas channel, the ash blocking driving part drives the first plate body and the second plate body to rotate relatively, the first ash blocking unit is arranged on the inlet flue and can intercept and pre-collect fly ash entering the reactor main body, the pressure of a catalyst is relieved, and the first plate body and the second plate body rotate to adjust, so that the automatic adjustment of ash blocking of the flue gas channel is realized.

Further preferably, the included angle between the first plate body and the second plate body is 18-60 degrees.

Preferably, the first ash blocking unit further comprises a concentration monitor for monitoring the ash concentration in the reactor body and a differential pressure monitor for monitoring the flue gas resistance in the reactor body, the ash blocking driving member adjusts the angle between the first plate body and the second plate body according to the monitoring data of the concentration monitor and the differential pressure monitor, and the opening size of the flue gas channel can be adjusted according to the ash load concentration and the flue gas pressure by monitoring two parameter thresholds of the ash load concentration and the flue gas resistance, so that the ash blocking effect is finally achieved.

Preferably, the second block grey unit include the ash blocking plate, lead grey passageway, the ash blocking plate on seted up the flue gas hole, the ash blocking plate recessed formation deposition groove that leads, lead grey passageway upper end communicate respectively the both ends of deposition groove, the lower extreme that leads grey passageway extend to the export flue.

Further preferably, a control valve is arranged at the inlet of the ash guide channel.

Further preferably, the ash guide channel is provided with a plurality of ash guide channels.

Further preferably, the section of the ash guide channel is trapezoidal.

Further preferably, the second block grey unit still including pushing away grey subassembly, push away grey subassembly be used for with the deposition in the deposition inslot push extremely lead grey passageway in, push away grey subassembly including pushing away the hawk, push away grey driving piece, push away the hawk setting and be in the deposition inslot, push away grey driving piece with push away the hawk be connected drive its deposition inslot reciprocating motion.

Further preferably, the ash pushing plate is provided with a hole, and accumulated ash can pass through the hole in the ash pushing process, so that the resistance of the ash pushing plate in the pushing process is reduced.

Further preferably, the ash pushing plate is vertically arranged in the ash depositing groove.

Further preferably, the shape of the dust pushing plate is consistent with the cross section of the dust collecting groove.

Further preferably, the second dust blocking unit further comprises soot blowing members, and the soot blowing members are arranged on two sides of the soot blocking plate and used for blowing the soot on the soot blocking plate into the soot deposition groove.

Preferably, the system comprises a first ash hopper and an ash conveying pipe, the first ash hopper is arranged in the inlet flue and positioned at the front part of the first ash blocking unit, one end of the ash conveying pipe is communicated with the first ash hopper, and the other end of the ash conveying pipe is communicated with the outlet flue.

Preferably, the top of the reactor body extends downwards from one side of the inlet flue to the opposite side in an inclined manner, the system further comprises a second ash hopper and an ash conveying pipe, the second ash hopper is arranged on the other side, opposite to the inlet flue, of the reactor body, one end of the ash conveying pipe is communicated with the second ash hopper, and the other end of the ash conveying pipe is communicated with the outlet flue. Due to the inertia of the flue gas, a large amount of fly ash is carried through the inclined top of the reactor body, the fly ash carried by the flue gas close to the upper part of the flue is collected to the second ash bucket, and the collected fly ash can be collected to the outlet flue after falling to the second ash bucket.

Preferably, the outlet flue is provided with a venturi vertical pipe section, the venturi vertical pipe section is gradually expanded from a reducing mode, and the ash before is sucked to the outlet flue and discharged into downstream dust removal equipment through the venturi effect.

Preferably, the system further comprises an auxiliary catalyst unit, the auxiliary catalyst unit is arranged in the outlet flue, and the auxiliary catalyst unit absorbs a small amount of flue gas which is not reacted by the main catalyst unit.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the fly ash in the flue gas can be efficiently intercepted and transported through the ash blocking unit, and meanwhile, the fly ash is removed before passing through the catalyst by multiple measures, so that the service life of the catalyst is prolonged; the ash blocking unit is simple in structure, convenient to install and cost-saving.

Drawings

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a schematic structural diagram of an ash blocking plate set in this embodiment;

FIG. 3 is a schematic structural view of the dust shield of the present embodiment;

FIG. 4 is a schematic structural view of the dust pushing plate in the present embodiment.

In the above drawings:

1. a reactor body; 10. an inlet flue; 11. an outlet flue; 110. a venturi riser section; 2. a main catalyst unit; 3. a first ash blocking unit; 30. a flue gas channel; 31. a first plate body; 32. a second plate body; 40. a dust blocking plate; 400. a flue gas hole; 401. an ash accumulation groove; 41. an ash guide channel; 42. a soot blowing member; 43. pushing the ash plate; 430. an aperture; 44. a rod member; 50. a first ash hopper; 51. an ash conveying pipe; 60. a second ash hopper; 61. an ash conveying pipe; 7. a helper catalyst unit.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1: the utility model provides a cement kiln SCR denitration reaction system, includes reactor main part 1, main catalyst unit 2, and reactor main part 1 is connected with import flue 10 and export flue 11, and main catalyst unit 2 sets up in reactor main part 1. The inlet flues 10 extend in a horizontal direction and the outlet flues 11 extend in a downward inclination.

The system further comprises a first ash blocking unit 3 and a second ash blocking unit, and the first ash blocking unit 3 and the second ash blocking unit are specifically described in detail below.

The first ash blocking unit 3 is arranged in the inlet flue 10, the first ash blocking unit 3 is provided with a flue gas channel 30 allowing flue gas to pass through, and the opening size of the flue gas channel 30 is adjustable. As shown in fig. 2: in this embodiment: the first ash blocking unit 3 comprises an ash blocking plate group, an ash blocking driving part, a controller and the like. The ash blocking plate sets are provided with a plurality of sets, the plurality of sets of ash blocking plate sets are positioned on the same section of the inlet flue 10 and distributed up and down, and a flue gas channel 30 is formed between two adjacent sets of ash blocking plate sets. The ash blocking plate group comprises a first plate body 31 and a second plate body 32, the first plate body 31 and the second plate body 32 can rotate relatively, and the ash blocking driving part drives the first plate body 31 and the second plate body 32 to rotate relatively. The first plate body 31 and the second plate body 32 are made of rectangular stainless steel sheets and can be respectively connected with the rotating shafts, and the ash blocking driving part drives the first plate body 31 and the second plate body 32 to rotate relatively through driving the rotating shafts. First plate 31 and second plate 32 may be a single plate extending along both sides of inlet stack 10, or may be multiple plates as shown in fig. 2. When the horizontal angle of the first plate body 31 and the second plate body 32 is 0 degree, the opening of the smoke channel 30 between the two adjacent ash blocking plate groups is the largest, and at the moment, smoke can completely flow through without being blocked. Preferably, the included angle between the first plate 31 and the second plate 32 is 18-60 °. The fly ash before entering the reactor main body 1 is intercepted and pre-collected by arranging the first ash blocking unit 3 on the inlet flue 10, so that the pressure of the catalyst is relieved.

The first ash blocking unit 3 further comprises a concentration monitor for monitoring the ash concentration in the reactor body and a differential pressure monitor for monitoring the smoke resistance in the reactor body, and the concentration monitor and the differential pressure monitor are connected with the controller. Concentration monitor, differential pressure monitor can set up respectively in the both sides of first ash blocking unit 3, through two parameter threshold values of monitoring ash content load concentration and flue resistance, can be according to the height of ash content load, flue gas pressure, the opening size of adjustment flue gas passageway finally reaches the effect with the ash content interception.

The working process of the first ash blocking unit 3 is as follows: when the concentration monitor monitors that the total ash concentration is higher than a designed value, a signal is fed back to the controller, the controller adjusts an included angle between the first plate body 31 and the second plate body 32, and the ash blocking driving piece drives the first plate body 31 and the second plate body 32 to rotate and adjust, so that the size of the flue gas channel 30 is adjusted; when the differential pressure monitor monitors that the first ash blocking unit 3 causes the over-high resistance of the flue, the differential pressure monitor gives an alarm and feeds back a signal to the controller, and the controller adjusts the included angle of the first plate body 31 and the second plate body 32, so that the size of the flue gas channel 30 is adjusted, the differential pressure is reduced, and the gathered fly ash falls. When the ash content is too high and the pressure difference is lower than the alarm value, the system starts to work again.

The second ash blocking unit is arranged in the reactor main body 1 and above the main catalyst unit 2, and is provided with a flue gas hole 400 allowing flue gas to pass through. As shown in fig. 3, in the present embodiment: the second ash blocking unit comprises an ash blocking plate 40, an ash guide channel 41 and a soot blowing member 42. Wherein: the ash blocking plate 40 is provided with a flue gas hole 400, the ash blocking plate 40 is recessed to form an ash accumulation groove 401, the upper end of the ash guide channel 41 is communicated with two ends of the ash accumulation groove 401 respectively, the lower end of the ash guide channel 41 extends to the outlet flue 11, the ash blowing pieces 42 are arranged on two sides of the ash blocking plate 40 and used for blowing ash accumulated on the ash blocking plate 40 into the ash accumulation groove 41, fly ash accumulated on the ash blocking plate 40 is taken away by means of flue gas and the ash blowing pieces 42, and the self-cleaning effect is achieved. The ash blocking plate 40 may adopt an ash guiding grid, a plurality of ash guiding channels 41, two of which are shown in the figure, are provided, and the section of the ash guiding channel 41 is trapezoidal; a control valve, such as a load-bearing check valve, is arranged at the inlet of the ash guide channel 41; the sootblower 42 may employ an air cannon.

The second dust blocking unit further comprises a dust pushing assembly, and the dust pushing assembly is used for pushing the dust in the dust collecting groove 401 into the dust guide channel 41. As shown in fig. 4, in the present embodiment: the ash pushing assembly comprises an ash pushing plate 43 and an ash pushing driving member (such as a motor and the like), wherein the ash pushing plate 43 is vertically arranged in the ash deposition groove 401, and the ash pushing driving member is connected with the ash pushing plate 43 through a rod 44 to drive the ash pushing driving member to reciprocate in the ash deposition groove 401. The dust pushing plate 43 is provided with a hole 430, dust can pass through the hole 430 in the dust pushing process, the resistance of the dust pushing plate 43 in the pushing process is reduced, and the shape of the dust pushing plate 43 is consistent with the cross section of the dust depositing groove 401.

In addition, a weight sensor can be arranged at the bottom of the ash accumulation groove 401, when the fly ash in the ash accumulation groove 401 is accumulated to a certain degree, the ash pushing assembly starts to work, the ash pushing plate 43 is repeatedly pushed in the ash accumulation groove 401 until the ash content is pushed into the ash guiding channel 41, the control valve of the ash guiding channel 41 is opened, and the ash is discharged to the outlet flue 11; when the ash pushing plate 43 is not in operation, the control valve is closed, preventing untreated flue gas from flowing out of this passage.

The system also comprises a first ash hopper 50 and an ash conveying pipe 51, wherein the first ash hopper 50 is arranged in the inlet flue 10 and positioned at the front part of the first ash blocking unit 3, and the bottom of the first ash hopper 50 is provided with a load-bearing one-way valve; one end of the ash conveying pipe 51 is communicated with the first ash hopper 50, and the other end of the ash conveying pipe 51 is communicated with the outlet flue 11. The ash intercepted by the first ash blocking unit 3 falls into the first ash hopper 50 to be collected, and when the ash is collected to a certain weight, the load-bearing one-way valve opens the ash to be discharged to the outlet flue 11.

The top of the reactor body 1 is inclined and extends downwards from one side of the inlet flue 10 to the opposite side, the system further comprises a second ash hopper 60 and an ash conveying pipe 61, the second ash hopper 60 is arranged on the other side, opposite to the inlet flue 11, of the reactor body 1, one end of the ash conveying pipe 61 is communicated with the second ash hopper 60, and the other end of the ash conveying pipe 61 is communicated with the outlet flue 11. Due to the inertia of the flue gas, a large amount of fly ash is carried through the inclined top of the reactor body 1, the fly ash carried by the flue gas near the upper part of the flue is collected to the second ash bucket 60, and the collected fly ash falls to the second ash bucket 60 and then can be collected to the outlet flue 11 through the ash conveying pipe.

The outlet flue 11 is provided with a Venturi tube section 110, the Venturi tube section 110 is gradually enlarged from a gradually reduced position to a gradually enlarged position, the ash guide channel 41 and the ash conveying pipe 51 are communicated with the outlet flue 11 at the upstream of the Venturi tube section 110, the previous ash is sucked to the outlet flue 11 through the Venturi effect and is discharged into downstream dust removing equipment, and the adsorption of the fly ash does not need external power.

The system further comprises an auxiliary catalyst unit 7, which auxiliary catalyst unit 7 is arranged at the outlet position of the outlet flue 11, which auxiliary catalyst unit absorbs a very small portion of the flue gases that have not reacted because the control valve of the ash guiding channel 41 is briefly opened.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.