Accident chlorine alkali liquor circulation absorption system and method

Abstract

The invention belongs to the technical field of gas treatment, and particularly relates to an accident chlorine alkali liquor circulation absorption system and method, through the arrangement of a first-stage absorption assembly and a second-stage absorption assembly, the retention time of chlorine can be effectively prolonged when the chlorine reacts with alkali liquor in a treatment tank, so that the neutralization reaction effect on the chlorine is improved; through arrangement of a conducting pipe and a spraying disc and cooperation with a first spraying pipe, chlorine can be subjected to secondary treatment in the chlorine space transfer process, and meanwhile, alkali liquor is supplemented and circulated, so that the reaction is ensured to be effective.

Description

Technical Field

[0001] The invention belongs to the technical field of gas treatment, and in particular relates to an accidental chlorine gas alkali liquid circulation absorption system and method. Background Art

[0002] Chlorine is widely used in human production and life, especially in many fields of chemical production, where it is an important raw material. However, chlorine is toxic and highly irritating. It is easily dissolved in water under high pressure to form liquid chlorine, generating hypochlorous acid and hydrochloric acid. Especially in production activities, a certain amount of chlorine will be produced due to the production process or production accidents. If this part of chlorine is not effectively treated, it will inevitably cause pollution to the environment.

[0003] Currently, most common chlorine neutralization treatments use alkaline solution neutralization, that is, chlorine is input into alkaline solution, so that the chlorine reacts with the alkaline solution and is converted into a by-product chlorate. Although the reaction effect of alkaline solution and chlorine is extremely high, usually reaching 99.9%, the reaction time between chlorine and alkaline solution is not long during a single reaction process of the conventional reaction equipment currently used, which means that the chlorine needs to be circulated into the reaction equipment for treatment multiple times, which will reduce the reaction efficiency and thus extend the overall chlorine harmless treatment time. Summary of the invention

[0004] The purpose of the present invention is to provide a system and method for absorbing accidental chlorine gas and alkali liquid circulation, so as to solve the problems mentioned in the background technology.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] An accidental chlorine gas alkali liquid circulation absorption system comprises a treatment tank and a control panel, wherein the upper and lower ends of the treatment tank are respectively provided with an air outlet and an air inlet, and an absorption mechanism is arranged in the treatment tank;

[0007] The absorption mechanism includes a primary absorption component, a conducting pipe and a secondary absorption component. A partition plate is provided in the middle of the treatment tank to divide the inner cavity of the treatment tank into two upper and lower spaces. The primary absorption component and the secondary absorption component are respectively located on the lower and upper sides of the partition plate. The conducting pipe conducts the upper and lower spaces of the treatment tank and the openings are close to the partition plate.

[0008] The primary absorption assembly is composed of a plurality of arc plates, which are spaced and connected to each other by brackets, and the vertical section of the arc plate is bent toward the air inlet side;

[0009] The secondary absorption component is composed of a high column, which completely fills the middle of the upper inner cavity of the treatment tank. The high column is provided with a spiral groove around the axis that runs through the upper and lower ends of the high column.

[0010] The arc plate includes a full arc plate and a half arc plate. The full arc plate is in sealing contact with the inner wall of the treatment tank and has a circular hole at the center. A gap is left between the half arc plate and the inner wall of the treatment tank and has a plurality of first air holes at the center. The half arc plate is located at the bottom and is arranged alternately with the full arc plate from bottom to top.

[0011] A plurality of second air holes penetrating vertically are formed on the plane projection portion of the high column corresponding to the spiral line hollow groove.

[0012] The conducting pipe is generally U-shaped and its bending point is located on the upper side of the treatment tank. A first spray pipe is also provided in the connecting section between the conducting pipe and the lower inner cavity of the treatment tank. The first spray pipe is connected to the upper inner cavity of the treatment tank through a conduit and the conduit is provided with a water pump. The water level in the upper inner cavity of the treatment tank is lower than the U-shaped bending point of the conducting pipe.

[0013] A spray plate located on the upper side of the high column is also provided in the upper inner cavity of the processing tank, and the spray plate is communicated with an external liquid supply mechanism.

[0014] The lower inner cavity of the processing tank is provided with a drain pipe connected to the external liquid storage mechanism. The drain pipe is in a "7" shape and an electric control valve is provided at the discharge port. Liquid level sensors are provided on the upper and lower sides of the vertical ground section in the drain pipe.

[0015] The upper inner cavity and the lower inner cavity of the processing tank are both provided with drain pipes.

[0016] A method for absorbing accidental chlorine gas by alkali liquid circulation, the specific steps are as follows:

[0017] Step 1: Use an external liquid supply mechanism or pre-fill alkali solution into the treatment tank to reach the appropriate liquid level height of the upper inner cavity and the lower inner cavity;

[0018] Step 2: Chlorine is input through the air inlet. Chlorine is input from the lower inner cavity of the treatment tank and reacts with the alkali solution in the lower inner cavity first. At the same time, the primary absorption component controls the rising speed of chlorine to increase the reaction time;

[0019] Step 3: The chlorine gas that has undergone the initial reaction of the primary absorption component continues to be input into the conducting pipe due to the air pressure. The first spray pipe in the conducting pipe extracts and sprays the new alkali solution in the upper inner cavity of the treatment tank, and performs a secondary reaction on the chlorine gas in the conducting pipe. At the same time, the alkali solution with lower pH value and salt concentration is added to the lower inner cavity;

[0020] Step 4: The chlorine gas passing through the conducting pipe is input into the upper inner cavity of the treatment tank, and reacts three times with the alkali solution in the upper inner cavity of the treatment tank. At the same time, the secondary absorption component controls the rising speed of the chlorine gas to increase the reaction time;

[0021] Step 5: The chlorine gas that has passed through the secondary absorption component continues to move upward, and finally reacts with the PH value output by the spray plate and the alkali solution with the lowest salt concentration, and is finally output through the exhaust port.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] By setting up the primary absorption component and the secondary absorption component, the residence time of chlorine can be effectively increased when the chlorine reacts with the alkali solution in the treatment tank, thereby improving the neutralization reaction effect of the chlorine; the setting of the conducting pipe and the spray plate, in conjunction with the first spray pipe, can perform secondary treatment on the chlorine during the spatial transfer of the chlorine, and at the same time play a role in supplementing and circulating the alkali solution to ensure the effectiveness of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0025] Figure 1 The present invention is a schematic structural diagram of an accident chlorine gas alkali liquid circulation absorption system.

[0026] Figure 2 It is a structural cross-sectional view of the present invention.

[0027] Processing tank 1, partition plate 11, conducting pipe 13, high column 2, spiral groove 21, first air hole 22, full arc plate 3, half arc plate 31, round hole 32, second air hole 33, first spray pipe 4, spray plate 5, drain pipe 6, electric control valve 61. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Example 1: Figure 1-2 As shown, an accident chlorine gas alkali liquid circulation absorption system includes a processing tank 1 and a control panel. The upper and lower ends of the processing tank 1 are respectively provided with an air outlet and an air inlet, and an absorption mechanism is provided in the processing tank 1;

[0030] The absorption mechanism includes a primary absorption component, a conducting pipe 13 and a secondary absorption component. A partition plate 11 is provided in the middle of the treatment tank 1 to divide the inner cavity of the treatment tank 1 into two spaces, the primary absorption component and the secondary absorption component are respectively located on the lower and upper sides of the partition plate 11. The conducting pipe 13 conducts the upper and lower spaces of the treatment tank 1 and the openings are close to the partition plate 11.

[0031] The primary absorption assembly is composed of a plurality of arc plates, which are connected to each other at intervals by brackets, and the vertical section of the arc plate is bent toward the air inlet side;

[0032] The secondary absorption assembly is composed of a high column 2, which completely fills the middle of the upper inner cavity of the treatment tank 1. The high column 2 is provided with a spiral groove 21 around the axis and passes through the upper and lower ends of the high column 2.

[0033] When conducting chlorine neutralization treatment, alkali solution is first injected into the treatment tank 1 in advance. The injection method can be that liquid injection ports are respectively set on the upper and lower sides of the partition plate 11 of the treatment tank 1, until the appropriate liquid level height is reached, and chlorine can be input through the air inlet. At this time, the chlorine first enters the lower inner cavity of the treatment tank 1, and is blocked by multiple arc plates in the primary absorption component. Since the vertical section of the arc plate is bent toward the air inlet side, the chlorine will be blocked and the residence time in the alkali solution in the lower inner cavity will be increased, thereby increasing the reaction mixing time. After the chlorine reacts with the alkali solution in the lower inner cavity of the treatment tank 1, it will be input into the upper inner cavity space of the treatment tank 1 through the conducting pipe 13, and guided and blocked by the high column 2 in the secondary absorption component, so that the chlorine can be blocked by the high column 2 and guided by the spiral groove 21, which can extend the residence time of the chlorine in the treatment tank 1, thereby increasing the reaction time with the alkali solution in the treatment tank 1, so as to achieve the effect and need of full reaction.

[0034] The arc plate includes a full arc plate 3 and a semi-arc plate 31. The full arc plate 3 is in sealing contact with the inner wall of the treatment tank 1 and a circular hole 32 is opened at the center of the circle. There is a gap between the semi-arc plate 31 and the inner wall of the treatment tank 1 and a plurality of first air holes 22 are opened at the center of the circle. The semi-arc plate 31 is located at the bottom and is arranged alternately with the full arc plate 3 from bottom to top.

[0035] A plurality of second air holes 33 are formed in the plane projection portion of the high column 2 corresponding to the spiral groove 21 and extending vertically therethrough.

[0036] The cooperation of the full arc plate 3 and the semi-arc plate 31 can effectively block and guide the chlorine gas in the rising process. When passing through the semi-arc plate 31, the volume of the air chamber formed by the continuous delivery of the chlorine gas increases, thereby forcing the chlorine gas to be transported upward from the edge of the semi-arc plate 31. When passing through the full arc plate 3, the chlorine gas will be guided and blocked by the full arc plate 3 and continue to be transported upward from the circular hole 32. The first air hole 22 can directly send part of the chlorine gas upward when the chlorine gas is blocked by the semi-arc plate 31, thereby avoiding the inability to effectively block the chlorine gas due to the excessive volume of the air chamber at the semi-arc plate 31 and prolonging the residence time of the chlorine gas.

[0037] The second air holes 33 have the same effect as the first air holes 22 and can also divert the chlorine gas to a certain extent during the process of chlorine gas being transported upward from the spiral line slots 21, so as to avoid excessive accumulation of chlorine gas in the spiral line slots 21 in a short time, thereby reducing the reaction effect.

[0038] The upper inner cavity and the lower inner cavity of the treatment tank 1 are both provided with drain pipes, so that the original alkali solution can be discharged when the alkali solution needs to be replaced.

[0039] Example 2: Figure 1-2 As shown, it is a further improvement based on Example 1, the conducting pipe 13 is generally U-shaped and the bending point is located on the upper side of the treatment tank 1. A first spray pipe 4 is also provided in the connecting section between the conducting pipe 13 and the lower inner cavity of the treatment tank 1. The first spray pipe 4 is connected to the upper inner cavity of the treatment tank 1 through a conduit and the conduit is provided with a water pump. The water level in the upper inner cavity of the treatment tank 1 is lower than the U-shaped bending point of the conducting pipe 13.

[0040] The lower inner cavity of the processing tank 1 is provided with a drain pipe 6 connected to the external liquid storage mechanism. The drain pipe 6 is a "7"-shaped structure and an electric control valve 61 is provided at the discharge port. Liquid level sensors are provided on the upper and lower sides of the vertical ground section of the drain pipe 6.

[0041] In order to further improve the treatment effect of chlorine and the circulation of alkali solution, when chlorine passes through the conducting pipe 13, the first spray pipe 4 in the conducting pipe 13 will spray the alkali solution in the upper inner cavity of the treatment tank 1 into the conducting pipe 13 through a water pump. At this time, the chlorine will be subjected to secondary reaction treatment, and the pH value and salt concentration of the alkali solution at this time are lower than the alkali solution level in the lower inner cavity of the treatment tank 1. Therefore, it can play a role in replacing and balancing the alkali solution in the lower inner cavity of the treatment tank 1. In combination with the liquid storage effect of the two liquid level sensors in the drain pipe 6, chlorine can be prevented from leaking through the electric control valve 61. At the same time, when the liquid level in the drain pipe 6 reaches the liquid level sensor on the upper side, the liquid is discharged until the liquid level reaches the height of the liquid level sensor on the lower side, thereby balancing the liquid level height of the alkali solution in the lower inner cavity of the treatment tank 1.

[0042] Example 3: Figure 1-2 As shown, based on a further improvement of Example 1, a spray plate 5 located on the upper side of the high column 2 is further provided in the upper inner cavity of the processing tank 1, and the spray plate 5 is connected to an external liquid supply mechanism.

[0043] The spray plate 5 can serve as the last reaction stage of the chlorine after passing through the secondary absorption component, and can also be used as a means of supplementing the alkali solution, thereby achieving the circulation of the alkali solution and the treatment of the chlorine.

[0044] A method for absorbing accidental chlorine gas by alkali liquid circulation, the specific steps are as follows:

[0045] Step 1: Use an external liquid supply mechanism or pre-fill alkali solution into the treatment tank 1 to reach a suitable liquid level height in the upper inner cavity and the lower inner cavity;

[0046] Step 2: Chlorine is input through the air inlet. Chlorine is input from the lower inner cavity of the treatment tank 1 and reacts with the alkali solution in the lower inner cavity first. At the same time, the primary absorption component controls the rising speed of the chlorine to increase the reaction time;

[0047] Step 3: The chlorine gas that has undergone the initial reaction of the primary absorption component continues to be input into the conducting pipe 13 due to the air pressure, and the first spray pipe 4 in the conducting pipe 13 extracts and sprays the new alkali solution in the upper inner cavity of the treatment tank 1, and performs a secondary reaction on the chlorine gas in the conducting pipe 13, and at the same time, the alkali solution with a lower pH value and salt concentration is added to the lower inner cavity;

[0048] Step 4: The chlorine gas passing through the conducting pipe 13 is input into the upper inner cavity of the treatment tank 1, and reacts three times with the alkali solution in the upper inner cavity of the treatment tank 1. At the same time, the secondary absorption component controls the rising speed of the chlorine gas to increase the reaction time;

[0049] Step 5: The chlorine gas passing through the secondary absorption assembly continues to move upward, and finally reacts with the alkali solution with the lowest salt concentration output by the spray plate 5, and is finally output through the exhaust port.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An accidental chlorine gas alkali liquid circulation absorption system, comprising a treatment tank and a control panel, wherein the upper and lower ends of the treatment tank are respectively provided with an air outlet and an air inlet, characterized in that: An absorption mechanism is provided in the treatment tank; The absorption mechanism includes a primary absorption component, a conducting pipe and a secondary absorption component. A partition plate is provided in the middle of the treatment tank to divide the inner cavity of the treatment tank into two upper and lower spaces. The primary absorption component and the secondary absorption component are respectively located on the lower and upper sides of the partition plate. The conducting pipe conducts the upper and lower spaces of the treatment tank and the openings are close to the partition plate. The primary absorption assembly is composed of a plurality of arc plates, which are spaced and connected to each other by brackets, and the vertical section of the arc plate is bent toward the air inlet side; The secondary absorption component is composed of a high column, which completely fills the middle of the upper inner cavity of the treatment tank. The high column is provided with a spiral groove around the axis that runs through the upper and lower ends of the high column.

2. The accident chlorine gas alkali liquid circulation absorption system according to claim 1 is characterized in that: The arc plate includes a full arc plate and a half arc plate. The full arc plate is in sealing contact with the inner wall of the treatment tank and has a circular hole at the center. A gap is left between the half arc plate and the inner wall of the treatment tank and has a plurality of first air holes at the center. The half arc plate is located at the bottom and is arranged alternately with the full arc plate from bottom to top.

3. The accident chlorine gas alkali liquid circulation absorption system according to claim 2 is characterized in that: A plurality of second air holes penetrating vertically are formed on the plane projection portion of the high column corresponding to the spiral line hollow groove.

4. The accident chlorine gas alkali liquid circulation absorption system according to claim 3 is characterized in that: The conducting pipe is generally U-shaped and its bending point is located on the upper side of the treatment tank. A first spray pipe is also provided in the connecting section between the conducting pipe and the lower inner cavity of the treatment tank. The first spray pipe is connected to the upper inner cavity of the treatment tank through a conduit and the conduit is provided with a water pump. The water level in the upper inner cavity of the treatment tank is lower than the U-shaped bending point of the conducting pipe.

5. The accidental chlorine gas alkali liquid circulation absorption system according to claim 4 is characterized in that: A spray plate located on the upper side of the high column is also provided in the upper inner cavity of the processing tank, and the spray plate is communicated with an external liquid supply mechanism.

6. The accidental chlorine gas alkali liquid circulation absorption system according to claim 5 is characterized in that: The lower inner cavity of the processing tank is provided with a drain pipe connected to the external liquid storage mechanism. The drain pipe is in a "7" shape and an electric control valve is provided at the discharge port. Liquid level sensors are provided on the upper and lower sides of the vertical ground section in the drain pipe.

7. The accidental chlorine gas alkali liquid circulation absorption system according to claim 6 is characterized in that: The upper inner cavity and the lower inner cavity of the processing tank are both provided with drain pipes.

8. A method for absorbing accidental chlorine gas in alkali solution in a circulating manner, characterized in that: Absorption is performed using the absorption system described in any one of claims 1 to 7, and the specific steps are as follows: Step 1: Use an external liquid supply mechanism or pre-fill alkali solution into the treatment tank to reach the appropriate liquid level height of the upper inner cavity and the lower inner cavity; Step 2: Chlorine is input through the air inlet. Chlorine is input from the lower inner cavity of the treatment tank and reacts with the alkali solution in the lower inner cavity first. At the same time, the primary absorption component controls the rising speed of chlorine to increase the reaction time; Step 3: The chlorine gas that has undergone the initial reaction of the primary absorption component continues to be input into the conducting pipe due to the air pressure. The first spray pipe in the conducting pipe extracts and sprays the new alkali solution in the upper inner cavity of the treatment tank, and performs a secondary reaction on the chlorine gas in the conducting pipe. At the same time, the alkali solution with lower pH value and salt concentration is added to the lower inner cavity; Step 4: The chlorine gas passing through the conducting pipe is input into the upper inner cavity of the treatment tank, and reacts three times with the alkali solution in the upper inner cavity of the treatment tank. At the same time, the secondary absorption component controls the rising speed of the chlorine gas to increase the reaction time; Step 5: The chlorine gas that has passed through the secondary absorption component continues to move upward, and finally reacts with the PH value output by the spray plate and the alkali solution with the lowest salt concentration, and is finally output through the exhaust port.

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