CN215400760U - Novel ammonia absorption tank and novel ammonia water storage device - Google Patents

Abstract

The utility model relates to a novel ammonia absorption tank and a novel ammonia water storage device. The novel ammonia absorption tank is characterized in that a tank body of the novel ammonia absorption tank is provided with a packing layer, a cooling coil, a downcomer and a demineralized water spray head, the downcomer is vertically arranged and penetrates through the packing layer and the tank body, the top end of the downcomer is provided with an overflow inlet, and the bottom end of the downcomer is provided with an overflow outlet; novel aqueous ammonia storage device include the aqueous ammonia storage tank with novel ammonia absorption tank, the ammonia absorption tank is located the top of aqueous ammonia storage tank, and its gas distribution pipe passes through the relief valve or the breather valve export of aqueous ammonia storage tank of aqueous ammonia gas-supply pipe connection, and its downcomer lower extreme extends to in the aqueous ammonia storage tank or connect the aqueous ammonia back flow of aqueous ammonia storage tank. The utility model can effectively recover the ammonia gas escaping from the ammonia water storage tank, and reduce or avoid corresponding resource waste and environmental pollution.

Description

Novel ammonia absorption tank and novel ammonia water storage device

Technical Field

The utility model relates to a novel ammonia absorption tank and a novel ammonia water storage device with the same.

Background

NO of electric power industry since the comprehensive implementation of ultralow emission modification in the coal-fired power generation industry of China in 2015_xThe emission is greatly reduced, and with the gradual emphasis of the country on the prevention and control of the atmospheric pollution and the increasing strictness of the environmental protection standard, the ultra-low emission not only becomes the 'normalization index' of the coal-fired power generation industry, but also becomes the 'normalization index' of the industries such as steel, coking, cement, industrial furnaces and the like in succession. Among the denitration technologies, the Selective Catalytic Reduction (SCR) technology becomes the most ideal NO in the "ultra-low emission" reforming technology route by virtue of its advantages of high removal efficiency, stable and reliable process system, good flue gas applicability, NO secondary pollution and the like_xAnd (5) treatment technology.

The common reducing agents used in the SCR denitration system include liquid ammonia, ammonia water and urea. Wherein, liquid ammonia belongs to dangerous chemicals, has serious potential safety hazard in the storage and use, and along with the security supervision situation of our country is stricter day by day, the application of liquid ammonia as reductant in deNOx systems has been replaced by safer aqueous ammonia and urea gradually. The urea can be used for preparing ammonia by means of pyrolysis or hydrolysis, the investment of ammonia water evaporation engineering is higher than that of urea pyrolysis, but the ammonia preparation conversion rate is high, the system operation energy consumption is low, the operation failure rate is low, and the technology economy of the ammonia preparation process by ammonia water evaporation is better compared comprehensively. When the ammonia water is used as a reducer of a denitration system, the ammonia content is generally not more than 25%, the safety risk is greatly reduced than that of the ammonia water, and the ammonia water is increasingly applied to flue gas denitration systems of steel, coking, nonferrous metal, smelting kilns and the like due to the characteristics of simple process system, low operation energy consumption and the like, and gradually becomes a mainstream reducer of the denitration system in the non-electric industry.

The existing factory usually uses stainless steel vertical storage tank to store ammonia water, a safety valve or a breather valve is arranged above the storage tank to release ammonia gas escaping from the ammonia water, the ammonia gas escaping from the storage tank is sent to an ammonia dilution tank through a pipeline, so that the ammonia gas is dissolved in the water in the dilution tank, and finally the ammonia is discharged to a sewage pipe network from the ammonia dilution tank. Due to the nature of the ammonia water, the solubility of the ammonia gas dissolved in the water is reduced along with the temperature rise, and the ammonia gas is discharged from the storage tank in a large amount in summer or at a higher temperature, so that the waste of the ammonia and the pungent odor pollution of an ammonia area are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to effectively recover ammonia escaping from an ammonia water storage tank, and reduce or avoid resource waste and environmental pollution caused by ammonia escaping.

The technical scheme of the utility model is as follows: the novel ammonia absorption tank comprises a tank body, a packing layer, a cooling coil, a downcomer and a demineralized water spray head, wherein the packing layer is arranged in the tank body, is positioned at the upper part of an inner cavity of the tank body and is provided with a gas distribution pipe, the gas distribution pipe is provided with a plurality of outlets positioned in the packing layer and/or below the bottom surface of the packing layer and is also provided with an interface exposed outside the tank body, the cooling coil is arranged in the tank body and is positioned below the packing layer and is provided with a first end interface and a second end interface exposed outside the tank body, the demineralized water spray head is arranged in the tank body and is positioned above the packing layer and is provided with an interface exposed outside the tank body, the downcomer is vertically arranged and penetrates through the packing layer and the tank body, the top end of the downcomer is provided with an overflow inlet, and the overflow inlet is positioned in the inner cavity of the tank body between the packing layer and the spray head, the bottom end of the downcomer is provided with an overflow outlet, and the overflow outlet is exposed outside the tank body.

Preferably, the filler of the filler layer is corrugated stainless steel filler.

Preferably, the packing of the packing layer is structured packing which is regularly distributed into the packing layer.

Preferably, the structured packing is a perforated plate corrugated packing or a wire mesh corrugated packing.

Preferably, the number of the filler layers is one or more, the plurality of filler layers are distributed up and down, and a space is reserved between the adjacent filler layers.

Preferably, the gas distribution pipe adopts a distributed rake-shaped pipe.

Preferably, the distributed rake-shaped pipe comprises a main pipe and a plurality of branch pipes, each branch pipe is connected to the top of the main pipe, the pipe holes are communicated with the pipe holes of the main pipe, the outlets of the branch pipes are regularly distributed below the packing layer, the inlet side of the main pipe penetrates through the tank body, and the inlet of the main pipe is exposed outside the side face of the tank body to form an interface of the air distribution pipe.

Preferably, the top opening of the downcomer is funnel-shaped.

Preferably, the downcomer is or is not provided with a check valve.

Novel aqueous ammonia storage device, including the aqueous ammonia storage tank, the top of aqueous ammonia storage tank is equipped with relief valve or breather valve, and its characterized in that still includes the ammonia holding vessel, the ammonia holding vessel is located the top of aqueous ammonia storage tank, the gas distribution pipe's of ammonia holding vessel joint passes through the aqueous ammonia gas-supply pipe and connects the export of the relief valve of aqueous ammonia storage tank or breather valve, the downcomer lower extreme of ammonia holding vessel extends to in the aqueous ammonia storage tank or connect the aqueous ammonia back flow of aqueous ammonia storage tank, the aqueous ammonia back flow passes the tank deck of aqueous ammonia storage tank, and its inner end is located the internal of jar of aqueous ammonia storage tank, its outer end is exposed the external jar of aqueous ammonia storage tank.

The utility model has the following working modes and beneficial effects: ammonia escaping from a safety valve or a breather valve on the top of an ammonia water storage tank is introduced into an ammonia absorption tank through a pipeline, desalted water dissolved in the tank is dissolved through the enhanced absorption action of a high-efficiency absorption assembly to form low-concentration ammonia water, the concentration of the ammonia water in the tank is continuously increased along with the continuous absorption of the ammonia gas, the temperature in the tank is kept below 10 ℃ through a cooling coil arranged in the ammonia absorption tank because the ammonia gas is dissolved in water and is an exothermic reaction, the temperature in the tank is monitored in real time through a temperature sensor arranged on the ammonia absorption tank, the on-off state of a cooling medium electromagnetic valve of the cooling coil is controlled by using the existing control technology and a control device according to the temperature data in the tank, the work of the cooling coil is further controlled, the temperature in the tank is controlled, the concentration of the ammonia water in the ammonia absorption tank is detected in real time or at regular time by using an ammonia water concentration Analyzer (AIC) arranged on the ammonia absorption tank, and the concentration reaches a set value (for example, 3%) back, utilize current control technique and controlling means control demineralized water solenoid valve to open, to jar internal input demineralized water, the liquid level can rise along with the output of demineralized water in the jar, when the liquid level is higher than the downcomer funnel, the aqueous ammonia overflow gets into the downcomer funnel, flow into the aqueous ammonia storage tank that is located ammonia absorption tank directly below along the downcomer, make the ammonia that escapes from the aqueous ammonia storage tank get back to the aqueous ammonia storage tank again in, the effective recovery of ammonia has been realized, when aqueous ammonia concentration in the ammonia absorption tank is less than the setting value, control demineralized water solenoid valve closes.

Drawings

Fig. 1 is a schematic diagram relating to the configuration of an ammonia absorption tank.

Detailed Description

Referring to fig. 1, the novel ammonia absorption tank provided by the utility model comprises a tank body 10, a packing layer 2, a cooling coil 5, a downcomer 9 and a demineralized water spray head 1, wherein the packing layer is arranged in the tank body, is positioned at the upper part of an inner cavity of the tank body and is provided with a gas distribution pipe 7, the gas distribution pipe is provided with a plurality of outlets positioned in the packing layer and/or below the bottom surface of the packing layer, is also provided with a connector exposed outside the tank body and used for connecting an external ammonia gas pipe, the cooling coil is arranged in the tank body and positioned below the packing layer, is provided with a first end connector and a second end connector exposed outside the tank body and used for connecting an external cooling medium circulation pipeline, the demineralized water spray head is arranged in the tank body and positioned above the packing layer and is provided with a connector exposed outside the tank body and used for connecting an external demineralized water input pipe, the downcomer is vertically arranged and penetrates through the packing layer and the tank body, an overflow inlet is formed in the top end of the downcomer and is located in an inner cavity of the tank body between the packing layer and the spray head, and an overflow outlet is formed in the bottom end of the downcomer and is exposed outside the tank body.

The filler material of the filler layer may be any suitable prior art material for enhancing the water to ammonia gas coefficient, for example, corrugated stainless steel filler.

The filler of the filler layer can be bulk filler (stacking filler), and is filled above the pore plate for supporting at the bottom of the filler layer to form the filler layer.

The packing of packing layer can be regular packing, and the regular packing is regularly distributed to form the packing layer, and the regular packing is adopted to help to enhance the absorption effect of ammonia water and is convenient for maintenance.

The regular packing can be regular packing blocks in any suitable shape such as a cuboid shape, and is regularly arranged to form a packing layer covering the whole cross section according to the cross section shape of the inner cavity of the ammonia absorption tank.

The structured packing can also be made into the shape of the whole packing layer (the shape which can be arranged in the tank body and basically covers the whole cross section of the tank body), the structured packing is integrally arranged at the corresponding position in the tank body, angle steel or supporting rods can be arranged in the tank body for supporting, and the peripheral gap can be sealed according to the actual requirement.

The support can be arranged to be supported at the bottom of the structured packing layer, and can be a grid-shaped support or adopt any other suitable form according to the structured support requirement.

The modular design of the packing layer and the main body part (water distribution part) of the water distribution pipe can be realized, and a modular high-efficiency ammonia gas absorption assembly is formed, so that the field assembly and maintenance are convenient.

The structured packing is preferably orifice plate corrugated packing or wire mesh corrugated packing.

According to the requirement, the packing layers can be one layer or multiple layers, the multiple layers of packing layers are distributed up and down, and a space is reserved between the adjacent packing layers.

The gas distribution pipe can adopt a distributed harrow-shaped pipe.

The distributed rake-shaped pipe comprises a main pipe and a plurality of branch pipes, wherein each branch pipe is connected to the top of the main pipe, the pipe holes are communicated with the pipe holes of the main pipe, the outlets of the branch pipes are regularly distributed below the packing layer, so that the airflow at each part of the packing layer is basically kept consistent, the inlet side of the main pipe penetrates through the tank body, and the ports are exposed from the side surface of the tank body to form the interfaces of the air distribution pipe.

In practice, a short pipe passing through the tank body may be disposed on the tank body, the short pipe may be regarded as an interface of the main pipe, and an inner end of the short pipe is connected to a corresponding end of the main pipe (which may be regarded as a main body portion of the main pipe) through a connecting pipe member, so as to facilitate construction. The interfaces of other pipelines can also adopt the same arrangement mode.

The top opening of the downcomer is funnel-shaped and can be called as a downcomer funnel, so that a larger overflow inlet aperture is formed to facilitate overflow.

The downcomer can be provided with or not provided with a check valve, and the check valve can be positioned in the tank body or positioned outside the tank body.

The tank body can adopt an interlayer structure, and heat insulation materials can be arranged or not arranged in the interlayer. An insulating jacket may also be provided outside the tank body, which jacket should generally cover all or most of the area of the tank body. The heat insulation capability is improved through the arrangement of the interlayer or the heat insulation sleeve, and the cooling requirement on the cooling coil is reduced.

The tank may be provided with a temperature monitoring device (TIC) 4 for monitoring the temperature of the liquid in the tank, such as an on-line temperature sensor, to monitor the temperature in the tank in real time. The on-off state of a control valve 3 on a cooling medium input pipe of the cooling coil can be controlled by utilizing the existing control technology and a control device according to the temperature data in the tank, the working condition of the cooling coil is controlled, and the control on the temperature in the tank is further realized. Typically, the in-tank temperature can be controlled below 10 ℃ (or other design temperature threshold).

Can be equipped with aqueous ammonia concentration analysis Appearance (AIC) 8 that is used for detecting the interior ammonia concentration of jar liquid on the jar body to detect the aqueous ammonia concentration in the ammonia absorption jar in real time or regularly, after the concentration reaches the setting value (for example, 3%), utilize control flap 6 on the demineralized water input pipe that prior control technique and controlling means control demineralized water shower nozzle connect to open, input demineralized water in to jar, so that the aqueous ammonia that reaches the concentration requirement in the jar passes through the downcomer and flows.

The first end interface of the cooling coil (any interface in the cooling coil can be used as the first end interface according to actual arrangement) is connected with a cooling medium input pipe, the second end interface is connected with a cooling medium return pipe, and the cooling medium input pipe can be provided with a flow regulating valve and/or an on-off valve so as to switch in or switch off the cooling medium according to the temperature of liquid in the tank and/or regulate the flow of the cooling medium so as to control the temperature in the tank.

The desalting water spray head is usually one, is positioned right above the middle part of the packing layer, and can also be arranged at other positions. The demineralized water nozzle is provided with a nozzle pipe, and the upper part of the nozzle pipe penetrates through the top of the tank body to extend out to form an interface of the demineralized water nozzle.

The interface connection demineralized water input tube of demineralized water shower nozzle, can be equipped with on-off valve and/or flow control valve on the demineralized water input tube and regard as its control valve to the ammonia concentration according to liquid in the jar lets in or breaks the demineralized water, and/or adjusts the demineralized water flow, with the extraction of control jar interior liquid.

The interface connection ammonia gas-supply pipe of gas distribution pipe, can be equipped with or not be equipped with the check valve on the ammonia gas-supply pipe, the import of ammonia gas-supply pipe can be connected on the export of the relief valve at aqueous ammonia storage tank top or breather valve for collect the ammonia that overflows from the aqueous ammonia storage tank, the ammonia flows upwards after flowing out from the export of gas distribution pipe, through the packing layer, is constantly absorbed by the internal liquid (water) of jar, forms the aqueous ammonia. The liquid level in the tank body is limited by the top opening of the downcomer, and the filler layer is positioned in the liquid, so that the absorption of ammonia gas is facilitated.

The novel ammonia water storage device provided by the utility model comprises an ammonia water storage tank and an ammonia absorption tank, wherein a safety valve or a breather valve is arranged at the top of the ammonia water storage tank, the ammonia absorption tank adopts any novel ammonia absorption tank disclosed by the utility model, the ammonia absorption tank is positioned above, particularly right above, the joint of a gas distribution pipe of the ammonia absorption tank is connected with the outlet of the safety valve or the breather valve of the ammonia water storage tank through an ammonia water gas transmission pipe, the lower end of a downcomer of the ammonia absorption tank extends into the ammonia water storage tank or is connected with an ammonia water return pipe of the ammonia water storage tank, the ammonia water return pipe penetrates through the wall of the ammonia water storage tank, the inner end of the ammonia water return pipe is positioned in the ammonia water storage tank, preferably extends into the ammonia water, and the outer end of the ammonia water return pipe is exposed outside the ammonia water storage tank and is used for being connected with the downcomer of the ammonia absorption tank.

In general, an ammonia water storage tank may be provided with an ammonia absorption tank, in which case, the ammonia absorption tank is preferably located right above the ammonia water storage tank, an ammonia water return pipe is provided at the top of the ammonia water storage tank, a downcomer connected to the ammonia absorption tank is provided, and the ammonia water overflowing from the ammonia absorption tank directly flows into the ammonia water storage tank.

The ammonia absorption tank can be matched with a plurality of ammonia water storage tanks, the interface of the gas distribution pipe of the ammonia absorption tank is connected with the outlet of the safety valve or the breather valve of each ammonia water storage tank through a pipeline, ammonia escaping from each ammonia water storage tank is introduced into the ammonia absorption tank, the downcomer of the ammonia absorption tank can be connected into one ammonia water storage tank, a plurality of ammonia water storage tanks can also be connected through a plurality of ammonia water gas transmission branch pipes, and the proper pipeline arrangement can be adopted and/or valves are arranged on each ammonia water gas transmission branch pipe to adjust or control the flow direction or distribution proportion of ammonia water backflow.

It can be understood that the backflow of the ammonia water is realized according to the capacity, particularly the residual capacity, of the ammonia water storage tank, so that the liquid level in the ammonia water storage tank does not exceed the allowable upper limit after the ammonia water flows back, and the liquid level monitoring in the ammonia water storage tank can be performed according to the prior art.

The technical means disclosed by the utility model can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.

Claims (10)

1. The novel ammonia absorption tank comprises a tank body and is characterized by further comprising a packing layer, a cooling coil, a downcomer and a demineralized water spray head, wherein the packing layer is arranged in the tank body, is positioned at the upper part of an inner cavity of the tank body and is provided with a gas distribution pipe, the gas distribution pipe is provided with a plurality of outlets positioned in the packing layer and/or below the bottom surface of the packing layer and is also provided with an interface exposed outside the tank body, the cooling coil is arranged in the tank body and is positioned below the packing layer and is provided with a first end interface and a second end interface exposed outside the tank body, the demineralized water spray head is arranged in the tank body and is positioned above the packing layer and is provided with an interface exposed outside the tank body, the downcomer is vertically arranged and penetrates through the packing layer and the tank body, the top end of the downcomer is provided with an overflow inlet, and the overflow inlet is positioned in the inner cavity of the tank body between the packing layer and the spray head, the bottom end of the downcomer is provided with an overflow outlet, and the overflow outlet is exposed outside the tank body.

2. The new ammonia absorption tank as set forth in claim 1, wherein the packing of the packing layer is corrugated stainless steel packing.

3. The new ammonia absorption tank as set forth in claim 1, wherein the packing of the packing layer is structured packing, and the packing layer is regularly distributed.

4. A novel ammonia absorption tank according to claim 3, wherein said structured packing is orifice plate corrugated packing or wire mesh corrugated packing.

5. The new ammonia absorption tank as set forth in claim 1, wherein the number of said packing layers is one or more, and the plurality of packing layers are arranged one above the other with a space between adjacent packing layers.

6. The novel ammonia absorption tank as claimed in claim 1, wherein said gas distribution pipe is a distributed rake-shaped pipe.

7. The novel ammonia absorption tank as claimed in claim 6, wherein the distributed rake-shaped pipe comprises a main pipe and a plurality of branch pipes, each branch pipe is connected to the top of the main pipe, the pipe holes are communicated with the pipe holes of the main pipe, the outlets of the branch pipes are regularly distributed below the packing layer, the inlet side of the main pipe penetrates through the tank body, and the inlet of the main pipe is exposed outside the side surface of the tank body to form the interface of the gas distribution pipe.

8. The novel ammonia absorption tank as claimed in claim 1, wherein the top opening of said downcomer is funnel-shaped.

9. A novel ammonia absorption tank as claimed in claim 1, wherein said downcomer is provided with or without a check valve.

10. A novel ammonia water storage device comprises an ammonia water storage tank, wherein a safety valve or a breather valve is arranged at the top of the ammonia water storage tank, the novel ammonia absorption tank is characterized by further comprising an ammonia absorption tank, the ammonia absorption tank adopts the novel ammonia absorption tank of any one of claims 1 to 9, the ammonia absorption tank is positioned above the ammonia water storage tank, a joint of a gas distribution pipe of the ammonia absorption tank is connected with an outlet of the safety valve or the breather valve of the ammonia water storage tank through an ammonia water gas pipe, the lower end of a downcomer of the ammonia absorption tank extends into the ammonia water storage tank or is connected with an ammonia water return pipe of the ammonia water storage tank, the ammonia water return pipe passes through the tank top of the ammonia water storage tank, the inner end of the ammonia water return pipe is positioned in the tank body of the ammonia water storage tank, and the outer end of the ammonia water return pipe is exposed outside the tank body of the ammonia water storage tank.

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