CN103949138B - A kind of stop flue gas to pour in down a chimney absorption tower and application - Google Patents

Abstract

The present invention relates to a kind of absorption tower stoping flue gas to pour in down a chimney, described absorption tower comprises absorption tower body, stores slurries section, absorbent circulation line, absorption tower return line interface, smoke inlet and exhanst gas outlet, this external connection with storage slurries section of described absorption tower arranges an absorption tower slurries header device, and described absorption tower slurries header device comprises header device body, backflow slurry pipe line interface, gas vent and grout outlet pipeline joint.Absorption tower of the present invention arranges absorption tower slurries header device, this header device can effectively stop the flue gas in absorption tower to pour in down a chimney in slurries return pipeline, thus avoid the generation of pollutant leakage problem in absorption tower, and this absorption tower is with low cost, reduce the production cost of equipment, operation is convenient, not easily breaks down, it is convenient to run, and can be widely used in the desulfurization of flue gas.

Description

An absorption tower for preventing flue gas backflow and its application

technical field

The invention belongs to the technical field of environmental protection, and relates to a flue gas desulfurization absorption tower, in particular to an absorption tower for preventing flue gas backflow and its application.

Background technique

In the field of flue gas desulfurization for air pollutant control, the absorption tower, as the core equipment, is widely used in wet flue gas desulfurization technology. The desulfurization slurry is stored at the bottom of the absorption tower, and the upper part is the flue gas reaction zone, which is filled with flue gas, and the operating pressure is 2.0-3.0kPa. In the desulfurization system, there are several pipelines for recovering slurry to return to the absorption tower to meet the requirements for water recycling in the system. In this way, several slurry return ports will be opened on the absorption tower. The slurry return port on the absorption tower is emptied of slurry during the period of intermittent shutdown, which leads to the occurrence of flue gas backflow. Since the absorption tower is a positive pressure operation equipment, the gauge pressure of the gas phase operation is about 2.0-3.0kPa. When the return pipeline stops running, the flue gas in the tower will flow back with the pipeline because the slurry is no longer stored in the pipeline. The equipment connected by the pipeline flows out of the desulfurization system, causing the leakage of pollutants in the flue gas.

In the development of desulfurization technology, designers have improved this backflow method and adopted the method of opening below the liquid level. Put the slurry return pipe into the interface of the absorption tower, set it below the liquid level of the slurry at the bottom of the absorption tower, and rely on the static pressure of the slurry to prevent the gas in the tower from leaving. However, this method also has problems in operation: due to the deposition of Louis in the slurry pipe, it is necessary to vent the pipe during outage. This method will cause a siphon phenomenon when the return pipe is vented, and the slurry in the tower that is higher than the interface It is all sucked out, causing difficulty in operation.

In response to this problem, the designer installed a valve at the interface between the slurry return pipe and the absorption tower to isolate it, and set a vent valve on the pipe to vent the liquid in the pipe.

This method can solve the problem of flue gas backflow, but due to the high installation position of the valve, for the convenience of operation, this part of the valve needs to be designed as an electric valve or a pneumatic valve. This kind of valve is expensive, and as mentioned above, each There are several return pipelines on the absorption tower, which results in a large investment for this scheme.

Through searching, no patent publications related to the patent application of the present invention have been found.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an absorption tower that prevents flue gas from flowing backward. The device works on the principle of fluid mechanics, is easy to use, and has low investment in the device. In order to solve the problems, the absorption tower can be applied to the desulfurization of flue gas.

The purpose of the present invention is achieved through the following technical solutions:

An absorption tower for preventing flue gas backflow, the absorption tower includes an absorption tower body, a storage slurry section, an absorbent circulation pipeline, an absorption tower return pipeline interface, a flue gas inlet and a flue gas outlet, and the flue gas outlet communicates with It is arranged on the top of the absorption tower body or on the side wall of the upper part of the tower top. The flue gas inlet is connected to the side wall outside the middle and lower part of the absorption tower body. The main body is provided with an absorbent circulation pipeline, and the absorption tower body below the flue gas inlet is provided with a storage slurry section. The upper connection is provided with several absorption tower return pipeline connections,

An absorption tower slurry header device is arranged in communication with the storage slurry section outside the absorption tower body, and the absorption tower slurry header device includes a header device body, a return slurry pipeline interface, an air release port, and a slurry outlet pipeline interface. The main body of the header device is a hollow and closed box, and one or more return slurry pipeline interfaces are arranged on the top or the upper part of the outer wall of the top of the main body of the header device; The main body is communicated with one or more slurry pipeline interfaces; the top of the header device body or the upper part of the outer wall of the top is provided with an air release port; the return slurry pipeline interface of the header device is set above the operating liquid level of the absorption tower body , the slurry outlet pipe interface of the header device is located below the operating liquid level of the absorption tower body.

Moreover, the absorption tower body is a vertical reaction tower.

Moreover, the body of the header device includes a square box body, a tapered connection part and a bent pipe arranged in a hermetically connected manner from top to bottom, and the bottom of the bent pipe is provided with a slurry outlet pipe interface.

The above-mentioned application of the absorption tower preventing flue gas backflow in flue gas desulfurization.

Advantage and positive effect of the present invention are:

In the absorption tower of the present invention, an absorption tower slurry header device is arranged in communication with the storage slurry section outside the absorption tower body. When the absorption tower slurry header device stops working, the slurry in the absorption tower will automatically flow into the header device and the connecting pipe, and the coupler The return slurry pipeline interface and exhaust port on the tank device form a liquid seal, so the header device can effectively prevent the flue gas in the absorption tower from pouring back into the slurry return pipeline, thereby avoiding the leakage of pollutants in the absorption tower. occurrence, and the absorption tower is low in cost, reduces the production cost of the equipment, is easy to operate, is not easy to break down, is easy to operate, and can be widely used in flue gas desulfurization.

Description of drawings

Fig. 1 is the structural connection schematic diagram of absorption tower of the present invention;

Fig. 2 is the enlarged schematic view of the structure of the absorption tower slurry header device in Fig. 1;

Fig. 3 is a sectional view taken along the line A-A of Fig. 2 .

Detailed ways

Hereinafter, the present invention will be further described in detail by taking the embodiment of the accompanying drawings as an example. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

An absorption tower that prevents flue gas backflow, as shown in Figure 1, the absorption tower includes an absorption tower body 3, a storage slurry section 10, an absorbent circulation pipeline 2, an absorption tower return pipeline interface 8, and a flue gas inlet 11 and flue gas outlet 1, the absorption tower body can be a conventional desulfurization absorption tower in the technical field, can be an absorption tower form of the prior art, and in this embodiment, the absorption tower is a vertical reaction tower;

The flue gas outlet is connected to the top of the absorption tower body or the side wall on the upper part of the tower top, and the flue gas inlet is connected to the side wall outside the middle and lower part of the absorption tower body. The absorption tower body between the inlets is equipped with an absorbent circulation pipeline. The absorbent circulation pipeline is used to transport the absorption slurry. The flue gas enters the absorption tower from bottom to top, and the absorbent circulation absorption slurry enters the absorption tower from top to bottom. The gas-liquid two-phase reacts in the absorption tower body; the absorption tower body below the flue gas inlet is provided with a storage slurry section, and the storage slurry section is arranged at the bottom of the absorption tower body, and the operating liquid in the absorption tower body The outer wall below the position 9 is connected with several absorption tower return pipeline connections.

The innovation of the present invention is:

An absorption tower slurry header device is arranged in communication with the storage slurry section outside the absorption tower body, as shown in Figure 2 and Figure 3, the absorption tower slurry header device includes a header device body 6, a return slurry pipeline interface 4 , the air outlet 5 and the slurry pipeline interface 7, the header device body is a hollow, closed box shape, the top of the header device body or the upper part of the outer side wall of the top is provided with one or more return slurry pipeline interfaces, the The return slurry pipeline interface is used to connect the slurry pipeline that needs to be transported back to the absorption tower in the desulfurization system; the bottom or the outer side wall of the bottom of the header device body is connected with the absorption tower body to set up one or more slurry outlet pipeline interfaces. The pipeline interface and the return pipeline interface of the absorption tower can be connected and installed together through a connecting pipe; an air release port is arranged on the top of the header device body or on the upper part of the outer wall of the top.

The return slurry pipeline interface of the header device is located above the operating liquid level of the absorption tower body, and the slurry outlet pipeline interface of the header device is located below the operating liquid level of the absorption tower body. Those skilled in the art can return The installation height is determined by calculating the slurry flow rate of the absorption tower, the operating pressure of the absorption tower, the liquid density, and the structural size of the header device. The installation height can be calculated as follows:

When the header is working, the slurry flow rate is Q _M , the resulting internal and external liquid level difference is Δh, and the internal and external pressure difference is Δp. According to the Bernoulli equation, the working flow rate that can be achieved under the working liquid level difference can be obtained

$\mathrm{<span\; class="notranslate">\; v</span>}<span\; class="notranslate">\; =</span>\sqrt{\frac{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 1.5</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; \&Delta;hg</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span><span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; \&rho;</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.16</span>}\sqrt{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&Delta;hg</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;p</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>$

The working flow that can be achieved at this flow rate can be determined by get.

In this embodiment, as shown in FIG. 2 and FIG. 3 , the body of the header device includes a square box 12 , a tapered connecting portion 13 and a bent pipe 14 arranged in an airtight manner from top to bottom. A slurry outlet pipe interface is arranged at the bottom of the bent pipe.

The working principle of the absorbing tower that the present invention prevents flue gas from flowing backward is as follows:

The outer wall below the liquid level of the absorption tower is connected with several absorption tower return pipeline interfaces, and an absorption tower slurry header device is installed outside the absorption tower body outside the absorption tower return pipeline interface. The top of the header is provided with a return slurry pipeline interface, which is connected to the pipeline that needs to return the slurry. The top of the header device is provided with an air release port, through which the inside of the header device can be connected to the atmosphere; the bottom of the header device is provided with an outlet The slurry pipeline interface allows the slurry in the header device to flow into the absorption tower.

When the slurry header device of the absorption tower stops working, the slurry in the absorption tower will flow into the header device by itself, and a liquid seal will be formed on the return slurry pipeline interface and the air release port on the header device to keep the flue gas in the absorption tower from leaking out.

When the absorption tower slurry header device is working, the return slurry pipeline of the desulfurization system is connected to the return slurry pipeline interface on the top of the header device, and the return slurry flows into the internal buffer of the header device, and at the same time, the slurry is discharged from the bottom of the header device The pipeline interface flows into the absorption tower below the operating liquid level, and the header device is provided with an air release port, which is connected to the atmosphere to ensure that the static pressure in the header device is the local atmospheric pressure. Since the slurry has resistance when flowing from the header device to the absorption tower, the liquid level of the slurry in the header will be higher than that in the absorption tower, and the static pressure difference will be caused by the liquid level difference. When the liquid level in the header reaches a certain height, and the liquid level in the absorption tower reaches a liquid level difference Δh, the water inflow and outflow in the header device will reach a balance.

Claims (4)

1. the absorption tower stoping flue gas to pour in down a chimney, described absorption tower comprises absorption tower body, store slurries section, absorbent circulation line, absorption tower return line interface, smoke inlet and exhanst gas outlet, described exhanst gas outlet is communicated on the tower top of absorption tower body or the sidewall on tower top top, described smoke inlet is communicated on the sidewall outside the middle and lower part of absorption tower body, absorbent circulation line is established in absorption tower body between exhanst gas outlet and smoke inlet, be provided with in absorption tower body below described smoke inlet and store slurries section, this storage slurries section is located at intrinsic bottom, absorption tower, outer wall below the liquid level of this absorption tower body is communicated with and is provided with several absorption towers return line interface, it is characterized in that:

This external connection with storage slurries section of described absorption tower arranges an absorption tower slurries header device, described absorption tower slurries header device comprises header device body, backflow slurry pipe line interface, gas vent and grout outlet pipeline joint, described header device body is hollow, closed casing shape, and the top of this header device body or top outer wall top arrange one or more backflow slurry pipe line interface; The bottom of this header device body or bottom outside wall are communicated with absorption tower body and arrange one or more grout outlet pipeline joint; Top or the top outer wall top of this header device body arrange a gas vent; The backflow slurry pipe line interface of described header device is located at above the operation liquid level of absorption tower body, and the grout outlet pipeline joint of this header device is located at below the operation liquid level of absorption tower body.

2. the prevention flue gas according to claim 1 absorption tower of pouring in down a chimney, is characterized in that: described absorption tower body is vertical reaction tower.

3. the prevention flue gas according to claim 1 and 2 absorption tower of pouring in down a chimney, it is characterized in that: described header device body comprises from top to bottom square box, cone connection and the bending pipeline that airtight connection is successively arranged, and the bottom of described bending pipeline arranges pulp pipe joint.

4. the application of absorption tower in flue gas desulfurization that the prevention flue gas as described in any one of claims 1 to 3 pours in down a chimney.