Cement kiln tail high-temperature low-dust SCR (Selective Catalytic Reduction) denitration equipment capable of realizing off-line ash removal

Abstract

The utility model provides cement kiln tail high-temperature low-dust SCR (Selective Catalytic Reduction) denitration equipment capable of realizing off-line ash removal, which comprises a high-temperature bag dust collector, a denitration reactor, a flue, more than two compartments, a flap valve assembly and an ash removal assembly for carrying out ash removal treatment on a filter bag to be cleaned of the high-temperature bag dust collector, all the compartments are arranged at the top of the high-temperature bag dust collector, the denitration reactor is arranged beside the high-temperature bag dust collector, the flue is located between the compartments on the two sides, and the flue is communicated with an air inlet of the denitration reactor; the air inlets of the sub-chambers are communicated with the corresponding high-temperature bag dust collectors, and the flap valve assemblies are located at the air outlets of the sub-chambers and used for communicating or blocking the air outlets of the sub-chambers with the flue; the flap valve assemblies are closed, the air outlets of the sub-chambers are blocked from the flue, the sub-chambers are unloaded, and smoke does not circulate in the sub-chambers, so that off-line ash removal of the high-temperature bag dust collector is achieved, and the single-chamber ash removal effect is more thorough.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical equipment technical field especially is a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning. BACKGROUND

[0002] With the performance of cement industry nitrogen oxide ultra-low emission, cement SCR denitration reconstruction application is more and more, aiming at the kiln tail flue gas denitration of cement industry, according to the cement kiln characteristics and the scene situation is considered, at present, there are four kinds of SCR process scheme, respectively high temperature high dust, high temperature medium dust, high temperature low dust and medium temperature medium dust arrangement scheme. At present, the domestic cement industry engineering application technical route is high temperature high dust, high temperature medium dust, high temperature low dust SCR denitration system, generally arranged between kiln tail preheater C1 export and waste heat boiler, the process is greatly affected by dust, needs to arrange pre-dedusting system (such as high temperature electrostatic precipitator, high temperature cloth bag dust collector) in front of SCR, and the arrangement mode is greatly influenced by site, and the on-site arrangement and construction difficulty are greater, the flue gas passes through SCR system and has certain influence on waste heat boiler power generation. Several process routes are currently applied, and the high temperature low dust route is to remove the dust in the flue gas to 10mg / Nm 3 Below, the life of the catalyst and the denitration efficiency are greatly improved.

[0003] Referring to Figure 1 , Figure 1 It is a structure schematic view of the high temperature low dust SCR denitration equipment in the prior art. The high temperature low dust SCR denitration system is generally arranged between the kiln tail preheater C1 export and the waste heat boiler, the flue gas temperature is generally 280-350 DEG C, and the dust concentration is generally 100-140g / Nm 3 , the filter bag adopts metal material, and the dust is reduced to 10mg / Nm 3 Below, then enters the SCR denitration reactor and carries out the treatment of NOx. Its flow is as shown in Figure 1 When dusting, compressed air is introduced into the filter bag in the high temperature bag dust collector, so that the dusting effect is realized.

[0004] The applicant finds that the prior art at least has the following technical problems: the high temperature bag dust collector is not provided with a compartment, and the SCR denitration reactor is located directly above the high temperature bag dust collector, offline dusting function cannot be realized, that is, compressed air cannot be blown in under the premise of blocking the flue gas flowing into the high temperature bag dust collector, the dusting effect is poor, the operation resistance of the dust collector is high, and then the energy consumption is increased. Utility model content

[0005] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment of offline dust cleaning can be realized to solve the prior art in the prior art high temperature low dust SCR denitration equipment cannot realize offline dust cleaning, and the technical problem of poor dust cleaning effect of the utility model discloses a plurality of technical solutions of the preferred technical scheme of the utility model can produce a plurality of technical effects, and the technical effects are described below.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment of offline dust cleaning can be realized, including high temperature bag dust collector, denitration reactor, flue, compartment, flap valve subassembly and be used to the filter bag of high temperature bag dust collector of waiting clean dust cleaning handle dust cleaning subassembly, wherein:

[0008] The number of compartments is two or more, and all the compartments are arranged on the top of the high-temperature bag dust collector.

[0009] The gas inlet of the compartment is communicated with the corresponding high-temperature bag dust collector, and the flap valve assembly is located at the gas outlet of the compartment.

[0010] Preferably, the number of high-temperature bag dust collectors is two or more, and all the high-temperature bag dust collectors are arranged side by side.

[0011] Preferably, the compartment is provided with two or more rows, and the number of compartments in each row is two or more.

[0012] Preferably, the gas inlet of the denitration reactor is located at the top thereof, and the gas outlet of the denitration reactor is located at the bottom thereof.

[0013] Preferably, the flap valve assembly comprises a plate body, a telescopic driving device and a connecting rod.

[0014] The plate body is fixed with a rotating shaft, which is rotatably connected to the side wall of the gas outlet of the compartment.

[0015] Preferably, the high-temperature bag dust collector is communicated with a gas inlet pipe.

[0016] Preferably, the cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing offline dust cleaning further comprises a support, and the support supports and fixes all the high-temperature bag dust collectors.

[0017] Preferably, the dust cleaning assembly comprises a gas source device, a blowing main pipe and a nozzle pipe.

[0018] The gas source device is in communication with the blowing main pipe, the nozzle pipe is in communication with the blowing main pipe, the nozzle pipe is arranged along the length direction of the blowing main pipe at intervals, and the nozzle pipe extends into the filter bag to be cleaned of the high-temperature bag dust collector and is used for blowing and cleaning in the filter bag to be cleaned.

[0019] Preferably, the outer wall of the nozzle pipe is provided with a spray hole.

[0020] Preferably, the nozzle pipe extends into the middle or bottom of the filter bag to be cleaned.

[0021] Compared with the prior art, the cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing offline dust cleaning has the following beneficial effects: in the normal use state, the flap valve assembly is opened, the gas outlet of the chamber is in communication with the flue, and the flue gas can enter the denitration reactor from the flue; when it is necessary to clean dust of one or specific high-temperature bag dust collector, the flap valve assembly is closed, the gas outlet of the chamber is blocked from the flue, the chamber is unloaded, and the flue gas does not flow through the chamber, so that the offline dust cleaning of the high-temperature bag dust collector is realized, the dust cleaning effect of the single chamber is more thorough, and the resistance increase caused by the secondary dusting after blowing and the rapid adsorption of the secondary dusting to the surface of the filter bag under the action of negative pressure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0023] Figure 1 is a structural schematic view of the high-temperature low-dust SCR denitration equipment in the prior art;

[0024] Figure 2 is a front view of the cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing offline dust cleaning in the embodiment;

[0025] Figure 3 is a side view of the cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing offline dust cleaning;

[0026] Figure 4 is a structural schematic view of the dust cleaning assembly;

[0027] Figure 5 is a top view of a cement kiln tail high-temperature low-dust SCR denitration equipment that can realize off-line soot cleaning;

[0028] Figure 6 is a structural schematic view of a flap valve assembly.

[0029] In the figure, 1 is a high-temperature bag dust collector; 11 is a filter bag; 2 is a denitration reactor; 3 is a compartment; 4 is an air inlet pipe; 5 is a flue; 6 is a flap valve assembly; 61 is a rotating shaft; 62 is an extension drive device; 63 is a connecting rod; 7 is a soot cleaning assembly; 71 is an air source device; 72 is a blowing main pipe; 73 is a nozzle pipe; 8 is a support. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0034] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figures 2-6 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0035] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figures 2-6 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figure 2 、 Figure 3 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figure 5 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0036] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0037] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figure 2 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0038] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. Figure 2 The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0039] The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again. The utility model discloses a cement kiln tail high temperature low dust SCR denitration equipment that can realize offline dust cleaning, can realize the offline dust cleaning of high temperature bag dust collector, makes single chamber dust cleaning effect more thorough, reduces the resistance increase caused by the secondary dusting after blowing under the action of negative pressure and the rapid adsorption to filter bag surface again.

[0040] As an optional implementation, see Figure 2 As shown, the air inlet of the denitrification reactor 2 is located at its top, and the air outlet of the denitrification reactor 2 is located at its bottom. The end of the flue 5 is connected to the air inlet of the denitrification reactor 2. The high-temperature bag dust collector 1 is connected to the air inlet pipe 4.

[0041] Flue gas enters multiple high-temperature baghouse dust collectors 1 through inlet pipe 4, then enters flue 5 through compartment 3, and finally enters denitrification reactor 2 through flue 5. The filter bags 11 in this structure are located at the top of the high-temperature baghouse dust collectors 1, providing ample space for bag replacement and facilitating operation. In case of localized damage to the filter bags 11, online sealing can be achieved, making operation convenient.

[0042] As an optional implementation, see Figure 5 and Figure 6 As shown, the flap valve assembly 6 includes a plate, a telescopic drive device 62, and a connecting rod 63. A rotating shaft 61 is fixed on the plate and is rotatably connected to the air outlet side wall of the compartment 3. The output end of the telescopic drive device 62 is rotatably connected to one end of the connecting rod 63, and the other end of the connecting rod 63 is fixedly connected to the rotating shaft 61. When the telescopic drive device 62 extends or retracts, it can pull the connecting rod 63 to move, thereby driving the rotating shaft 61 to rotate, thus opening or closing the plate.

[0043] See Figure 6 As shown, the telescopic drive device 62 can be a cylinder, hydraulic cylinder, etc. When the telescopic drive device 62 extends or retracts, it can pull the connecting rod 63 to move, thereby rotating the rotating shaft 61, and thus opening or closing the plate body, realizing the opening or closing of the flap valve assembly 6.

[0044] As an optional implementation, see Figure 2 As shown, the cement kiln tail high-temperature low-dust SCR denitrification equipment with offline dust removal capability in this embodiment also includes a support 8, which supports and fixes all high-temperature bag dust collectors 1.

[0045] The bracket 8 supports the high-temperature bag dust collector 1 above the ground to ensure the smooth operation of the reaction.

[0046] As an optional implementation, see Figure 4 and Figure 5 As shown, the dust removal assembly 7 includes an air source device 71, a main jet pipe 72, and nozzle pipes 73. The air source device 71 is connected to the main jet pipe 72, and the nozzle pipes 73 are also connected to the main jet pipe 72. The nozzle pipes 73 are spaced apart along the length of the main jet pipe 72 and extend into the filter bags 11 to be cleaned in the high-temperature baghouse dust collector 1 for jet cleaning of the filter bags 11. Spray holes are provided on the outer wall of the nozzle pipes 73.

[0047] The air source device 71 can be a compressed gas package or the like, and the compressed air in the air source device 71 enters the blowing main pipe 72 and the nozzle pipe 73, and the high-pressure air flow is sprayed from the spray holes on the nozzle pipe 73, and the filter bag 11 is cleaned by the pressure of the high-pressure air flow.

[0048] As an optional embodiment, referring to Figure 4 The nozzle pipe 73 of the embodiment extends into the middle or bottom of the filter bag 11 to be cleaned.

[0049] Referring to Figure 4 The nozzle pipe 73 extends into the middle or bottom of the filter bag 11 to be cleaned, which can reduce the pressure loss of the compressed gas and improve the cleaning effect on the filter bag 11.

[0050] Referring to Figure 5 The cement kiln tail high-temperature low-dust SCR denitration equipment of the embodiment can realize offline dust cleaning, and when one or some filter bags 11 are cleaned, referring to Figure 5 As shown in the figure, Figure 5 The flap valve assembly 6 closes one of the chambers 3 in the upper left corner of the figure, and the chamber 3 is not communicated with the flue 5, and the flue gas of the remaining chambers 3 enters the flue 5 and then enters the denitration reactor 2 from the flue 5. Since Figure 5 The chamber 3 in the figure is unloaded, and there is no flue 5 flow, so that the single-chamber dust cleaning effect is more complete, and the resistance increase caused by the secondary dusting after spraying and the rapid adsorption to the surface of the filter bag 11 under the action of negative pressure is reduced.

[0051] In the description of the present specification, specific features, structures or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0053] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing off-line soot cleaning, characterized in that, The application relates to a cement kiln tail high-temperature low-dust SCR denitration equipment which comprises high-temperature bag dust collectors, a denitration reactor, flues, compartments, a flap valve assembly and a dust cleaning assembly for cleaning filter bags of the high-temperature bag dust collectors. The number of the compartments is two or more, all the compartments are arranged at the top of the high-temperature bag dust collectors, the denitration reactor is arranged beside the high-temperature bag dust collectors, and the flues are located between the compartments on both sides and are connected with the gas inlets of the denitration reactor. The gas inlets of the compartments are connected with the high-temperature bag dust collectors, and the flap valve assembly is arranged at the gas outlets of the compartments and is used for connecting or blocking the gas outlets of the compartments with the flues.

2. The cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The number of the high-temperature bag dust collectors is two or more, and all the high-temperature bag dust collectors are arranged side by side.

3. The cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The compartments are arranged in two rows or more, and the number of the compartments in each row is two or more.

4. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The gas inlets of the denitration reactor are located at the top of the denitration reactor, the gas outlets of the denitration reactor are located at the bottom of the denitration reactor, and the end of the flue is connected with the gas inlet of the denitration reactor.

5. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The flap valve assembly comprises a plate body, an extension driving device and a connecting rod. A rotating shaft is fixed on the plate body and is rotationally connected with the side wall of the gas outlet of the compartment, one end of the connecting rod is rotationally connected with the output end of the extension driving device, the other end of the connecting rod is fixedly connected with the rotating shaft, and the extension driving device can pull the connecting rod to move when the extension driving device is extended or retracted, thereby driving the rotating shaft to rotate, so that the plate body is opened or closed.

6. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The high-temperature bag dust collector is connected with a gas inlet pipe.

7. The cement kiln tail high-temperature low-dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 6, characterized in that, The cement kiln tail high-temperature low-dust SCR denitration equipment which can realize offline dust cleaning further comprises a support which supports and fixes all the high-temperature bag dust collectors.

8. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 1, characterized in that, The dust cleaning assembly comprises a gas source device, a blowing main pipe and a nozzle pipe. The gas source device is connected with the blowing main pipe, the nozzle pipe is connected with the blowing main pipe, the nozzle pipes are arranged along the length direction of the blowing main pipe at intervals, the nozzle pipes extend into the filter bags to be cleaned of the high-temperature bag dust collectors and are used for blowing and cleaning the filter bags to be cleaned.

9. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 8, characterized in that, The outer wall of the nozzle pipe is provided with a spray hole.

10. The cement kiln tail end high temperature low dust SCR denitration equipment capable of realizing off-line soot cleaning according to claim 8, characterized in that, The nozzle pipe extends into the middle or bottom of the filter bag to be cleaned.

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