Ammonia pre-adsorption active coke flue gas purification tower

Abstract

The utility model provides an ammonia pre-adsorption active coke flue gas purification tower. The ammonia pre-adsorption active coke flue gas purification tower comprises a tower body and a stock bin, a first breathable supporting piece is arranged in the tower body, the interior of the tower body is divided into an active coke chamber and a mixed gas chamber by the first breathable supporting piece, an ammonia gas inlet, a raw flue gas inlet and a purified flue gas outlet are formed in the side wall of the tower body, the ammonia gas inlet and the raw flue gas inlet are both communicated with the mixed gas chamber, and the purified flue gas outlet is communicated with the active coke chamber. The purified flue gas outlet is communicated with the active coke chamber; the stock bin is communicated with the active coke chamber through a material conveying pipe and used for conveying materials in the stock bin into the active coke chamber, the side wall of the stock bin is provided with an ammonia pre-injection inlet and an ammonia pre-injection outlet, and the ammonia pre-injection outlet is communicated with the mixed gas chamber through a recovery pipeline. The purification effect of the high-content HCl flue gas can be effectively improved, and meanwhile generation of NH4Cl crystals is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flue gas purification equipment, and particularly relates to an ammonia pre-adsorption activated coke flue gas purification tower. BACKGROUND

[0002] The activated coke selective catalytic reduction system is mainly used for flue gas desulfurization and denitrification purification. In use, activated coke is used as an adsorbent and moves from top to bottom in the adsorption tower by gravity, and the flue gas to be purified is in a countercurrent flow from bottom to top so as to make the flue gas contact with the activated coke adsorption layer, thereby achieving the purpose of removing pollutants in the flue gas.

[0003] In the prior art, the activated coke selective catalytic reduction system has poor purification effect on flue gas with high HCl content, and a large amount of NH4Cl crystalline substance is generated after the flue gas is mixed with ammonia because NH3 and HCl will react preferentially. The NH4Cl crystalline substance not only blocks the gas inlet, but also causes the activated coke bed to be cemented, so that the activated coke selective catalytic reduction system for flue gas desulfurization and denitrification is particularly prone to rapid pressure difference rise in actual production, resulting in frequent maintenance. CONTENT OF THE UTILITY MODEL

[0004] The application is proposed to solve the technical problems in the prior art that the activated coke selective catalytic reduction system has poor purification effect on flue gas with high HCl content and is prone to produce NH4Cl crystalline substance to block the system gas inlet, and proposes an ammonia pre-adsorption activated coke flue gas purification tower to effectively improve the purification effect of high HCl content flue gas and reduce the generation of NH4Cl crystalline substance.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] The ammonia pre-adsorption activated coke flue gas purification tower comprises a tower body and a stock bin.

[0007] The tower body is internally provided with a first gas-permeable support that divides the tower body into an activated coke chamber and a mixed gas chamber. The tower body side wall is provided with an ammonia gas inlet, a raw flue gas inlet and a purified flue gas outlet. The ammonia gas inlet and the raw flue gas inlet are both communicated with the mixed gas chamber, and the purified flue gas outlet is communicated with the activated coke chamber.

[0008] The stock bin is connected with the activated coke chamber through a material conveying pipe for conveying the material in the stock bin into the activated coke chamber. The stock bin side wall is provided with a pre-ammonia injection inlet and a pre-ammonia injection outlet. The pre-ammonia injection outlet is connected with the mixed gas chamber through a recovery pipeline.

[0009] Further, the activated coke chamber is located above the mixed gas chamber.

[0010] Further, the first air-permeable support is provided with a funnel-shaped air-permeable flow guide, the bottom end of the air-permeable flow guide faces the mixed gas chamber, and the bottom end of the air-permeable flow guide is provided with a flow guide discharge pipe which communicates with the outside of the tower body.

[0011] Further, the number of the air-permeable flow guides is two or more.

[0012] Further, the purified flue gas outlet is connected with an exhaust pipe, and the exhaust pipe is provided with a fan.

[0013] Further, the material conveying pipe is provided with a plurality of branch pipes for uniformly conveying the material in the material bin to the activated coke chamber.

[0014] Further, the relative positions between the pre-ammonia injection inlet and the pre-ammonia injection outlet are diagonally arranged.

[0015] Further, the material bin is arranged above the tower body, so that the material in the material bin can enter the activated coke chamber through the material conveying pipe by gravity.

[0016] Further, the material bin is internally provided with a second air-permeable support, the second air-permeable support divides the interior of the material bin into a material storage area and a pre-ammonia injection area, the pre-ammonia injection inlet communicates with the pre-ammonia injection area, and the pre-ammonia injection outlet communicates with the material storage area.

[0017] Further, the second air-permeable support is in a funnel shape, and the material conveying pipe communicates with the bottom end of the second air-permeable support.

[0018] The beneficial effects of the present application are as follows:

[0019] In the activated coke denitration process, NH3 and NOx must be adsorbed by activated coke before the two react to achieve the purpose of denitration. For flue gas with a high HCl content, in the process of simultaneously introducing ammonia and flue gas into the tower, ammonia will react with HCl first, thereby greatly reducing the amount of ammonia adsorbed on the activated coke, and thus seriously affecting the denitration effect. At the same time, the ammonium salt crystals generated by the reaction of ammonia and HCl not only block the gas inlets of flue gas and ammonia, but also cause the activated coke bed (a bed formed by stacking activated coke) to harden. To this end, the present application sets a pre-ammonia injection inlet on the material bin for pre-injecting ammonia into the activated coke in the material bin, so that part of the ammonia is preferentially adsorbed on the activated coke, thereby improving the subsequent flue gas purification effect of the activated coke. At the same time, after using the pre-ammonia injection technology, the amount of ammonia mixed with flue gas can be greatly reduced, which can effectively reduce the generation of NH4Cl crystals and effectively slow down the blockage of the gas inlets of flue gas and ammonia and the hardening of the activated coke bed. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 The structural schematic diagram of the active coke flue gas purification tower provided by the embodiments of the present application is shown.

[0022] DESCRIPTION OF DRAWINGS

[0023] Tower body 1, first air permeable support 1-1, active coke chamber 1-2, mixed gas chamber 1-3, ammonia gas inlet 1-4, raw flue gas inlet 1-5, purified flue gas outlet 1-6, air permeable flow guide 1-7, flow guide discharge pipe 1-8, fan 1-9, stock bin 2, material conveying pipe 2-1, pre-ammonia injection inlet 2-2, pre-ammonia injection outlet 2-3, recovery pipeline 2-4, second air permeable support 2-5, storage area 2-6, pre-ammonia injection area 2-7. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some 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 any creative effort belong to the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0026] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0029] The embodiment of the present application provides an ammonia pre-adsorption activated coke flue gas purification tower, as shown in the figure, comprising a tower body 1 and a bin 2. Figure 1 As shown in the figure, it comprises a tower body 1 and a bin 2.

[0030] The tower body 1 is internally provided with a first air permeable support 1-1, which separates the tower body into an active coke chamber 1-2 and a mixed gas chamber 1-3. The side wall of the tower body 1 is provided with an ammonia gas inlet 1-4, a raw flue gas inlet 1-5 and a purified flue gas outlet 1-6. The ammonia gas inlet 1-4 and the raw flue gas inlet 1-5 are both communicated with the mixed gas chamber 1-3. In use, the ammonia gas inlet 1-4 is used to introduce external ammonia gas into the mixed gas chamber 1-3, and the raw flue gas inlet 1-5 is used to introduce external raw flue gas to be purified into the mixed gas chamber 1-3. The purified flue gas outlet 1-6 is communicated with the active coke chamber 1-2, and is used to discharge the purified flue gas to the outside.

[0031] The bin 2 is connected with the active coke chamber 1-2 through a material conveying pipe 2-1 for conveying the material (active coke) in the bin 2 to the active coke chamber 1-2. The side wall of the bin 2 is provided with a pre-ammonia injection inlet 2-2 and a pre-ammonia injection outlet 2-3. The pre-ammonia injection inlet 2-2 is used to inject external ammonia gas into the bin 2 so that the active coke in the bin 2 can pre-adsorb the ammonia gas. The pre-ammonia injection outlet 2-3 is connected with the mixed gas chamber 1-3 through a recovery pipeline 2-4, and is used to introduce the excess ammonia gas generated by pre-ammonia injection into the mixed gas chamber 1-3.

[0032] The ammonia pre-adsorption active coke flue gas purification tower provided above is used to introduce ammonia gas into the bin 2 through the pre-ammonia injection inlet 2-2 so that the ammonia gas can be pre-adsorbed on the active coke in the bin 2. The excess ammonia gas enters the mixed gas chamber 1-3 through the recovery pipeline 2-4. The active coke pre-adsorbed with ammonia gas in the bin 2 is conveyed to the active coke chamber 1-2 through the material conveying pipe 2-1 and forms an active coke bed layer for purifying flue gas. The ammonia gas inlet 1-4 and the raw flue gas inlet 1-5 are used to convey ammonia gas and raw flue gas to be purified into the mixed gas chamber 1-3, respectively. The ammonia gas and the raw flue gas to be purified in the mixed gas chamber 1-3 are mixed and then pass through the active coke bed layer for purification. The purified flue gas is finally discharged through the purified flue gas outlet 1-6.

[0033] In some embodiments, in order to make the flue gas to be purified and the active coke bed better form a convection to improve the purification effect, the active coke chamber 1-2 is arranged above the mixed gas chamber 1-3, and a funnel-shaped air permeable flow guide 1-7 is arranged on the first air permeable support 1-1, the bottom end of the air permeable flow guide 1-7 faces the mixed gas chamber 1-3, and the bottom end of the air permeable flow guide 1-7 is provided with a flow guide discharge pipe 1-8 which communicates with the outside of the tower body 1. In use, the active coke bed in the active coke chamber 1-2 is continuously discharged outward through the flow guide discharge pipe 1-8 under the action of the funnel-shaped air permeable flow guide 1-7, so that a flow convection is formed between the active coke bed and the flue gas to be purified. At the same time, the air permeable flow guide 1-7 is arranged in a funnel shape, which can also increase the initial contact area between the flue gas to be purified and the active coke bed, thereby improving the purification effect of the flue gas to be purified. In actual application, the number of the air permeable flow guide 1-7 can be determined by the above-mentioned effect, and generally two or more are appropriate.

[0034] In some embodiments, the purification flue gas outlet 1-6 is connected with an exhaust pipe, and a fan 1-9 is arranged on the exhaust pipe. In use, the fan 1-9 is used to extract the gas inside the tower body 1, thereby increasing the flow speed of the gas inside the tower body 1 and increasing the flue gas purification rate.

[0035] In some embodiments, the material conveying pipe 2-1 is provided with a plurality of branch pipes for uniformly conveying the material (active coke) in the material bin 2 to the active coke chamber 1-2.

[0036] In some embodiments, the relative positions between the pre-ammonia injection inlet 2-2 and the pre-ammonia injection outlet 2-3 are arranged in a diagonal manner, which can increase the flow distance of ammonia gas in the material bin 2 as much as possible, thereby increasing the amount of ammonia gas adsorbed by the active coke in the material bin 2.

[0037] In some embodiments, the material bin 2 is arranged above the tower body 1, so that the material (active coke) in the material bin 2 can enter the active coke chamber 1-2 through the material conveying pipe 2-1 by its own gravity.

[0038] In some embodiments, the bin 2 is internally provided with a second gas-permeable support 2-5, which separates the bin 2 into a storage area 2-6 and a pre-ammonia injection area 2-7. The pre-ammonia injection inlet 2-2 is connected to the pre-ammonia injection area 2-7. In use, ammonia gas enters the pre-ammonia injection area 2-7 through the pre-ammonia injection inlet 2-2, and then uniformly permeates through the second gas-permeable support 2-5 into the storage area 2-6 and is adsorbed on the activated coke. The pre-ammonia injection outlet 2-3 is connected to the storage area 2-6. The excess ammonia gas that is not adsorbed in the storage area 2-6 is discharged through the pre-ammonia injection outlet 2-3 and enters the mixed gas chamber 1-3 through the recovery pipeline 2-4, and then is mixed with the flue gas to be purified and enters the activated coke chamber 1-2 to purify the flue gas to be purified.

[0039] In some embodiments, in order to facilitate the activated coke in the storage area 2-6 to more easily enter the activated coke chamber 1-2, the second gas-permeable support 2-5 is in a funnel-shaped structure, and the material conveying pipe 2-1 is connected to the bottom end of the second gas-permeable support 2-6.

[0040] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0041] The ammonia pre-adsorption activated coke flue gas purification tower provided by the embodiments of the present application is described in detail above, and specific examples are applied to explain the principles and implementation manners of the present application. The above embodiment descriptions are only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An activated coke flue gas purification tower for ammonia pre-adsorption, comprising a tower body and a silo; characterized in that: The tower body is provided with a first ventilated support member inside, which divides the interior of the tower body into an activated coke chamber and a mixed gas chamber. The side wall of the tower body is provided with an ammonia inlet, a raw flue gas inlet and a purified flue gas outlet. The ammonia inlet and the raw flue gas inlet are both connected to the mixed gas chamber, and the purified flue gas outlet is connected to the activated coke chamber. The silo is connected to the activated coke chamber via a conveying pipe to transport the material in the silo to the activated coke chamber. The side wall of the silo is provided with a pre-ammonia inlet and a pre-ammonia outlet. The pre-ammonia outlet is connected to the mixed gas chamber via a recovery pipe.

2. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The active char chamber is located above the mixed gas chamber.

3. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 2, characterized in that: The first ventilated support is provided with a funnel-shaped ventilated guide, the bottom end of which faces the mixing chamber, and the bottom end of which is provided with a guide and discharge pipe communicating with the outside of the tower body.

4. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 3, characterized in that: The number of the breathable guide element is two or more.

5. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The purified flue gas outlet is connected to an exhaust pipe, and a fan is installed on the exhaust pipe.

6. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The material conveying pipe is equipped with several branch pipes.

7. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The relative positions between the pre-ammonia inlet and the pre-ammonia outlet are set in a diagonal manner.

8. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The hopper is located above the tower body so that the material in the hopper can enter the activated coke chamber through the conveying pipe by its own gravity.

9. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 1, characterized in that: The silo is equipped with a second ventilated support, which divides the interior of the silo into a storage area and a pre-ammonia injection area. The pre-ammonia injection inlet is connected to the pre-ammonia injection area, and the pre-ammonia injection outlet is connected to the storage area.

10. The activated coke flue gas purification tower with ammonia pre-adsorption as described in claim 9, characterized in that: The second ventilated support has a funnel-shaped structure, and the material conveying pipe is connected to the bottom end of the second ventilated support.

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