An accident chlorine lye circulation absorption system and method

Abstract

The application belongs to the technical field of gas treatment and specifically relates to an accident chlorine alkali liquor circulating absorption system and method. Through the arrangement of the primary absorption assembly and the secondary absorption assembly, the residence time of chlorine gas can be effectively prolonged when the chlorine gas reacts with the alkali liquor in the treatment tank, so that the neutralization reaction effect on the chlorine gas is improved. The arrangement of the through pipe and the spray disc, in cooperation with the first spray pipe, can perform secondary treatment on the chlorine gas during the spatial transfer of the chlorine gas, and at the same time, the alkali liquor can be supplemented and circulated, so that the reaction is ensured to be effective.

Description

Technical Field

[0001] This invention belongs to the field of gas treatment technology, specifically relating to an emergency chlorine gas alkaline solution circulation absorption system and method. Background Technology

[0002] Chlorine has a wide range of uses in human production and daily life, especially in many fields of chemical production where it is an important raw material. However, chlorine is also toxic and has a strong irritant effect. Under high pressure, it is easily soluble in water to form liquid chlorine, which produces hypochlorous acid and hydrochloric acid. In particular, a certain amount of chlorine is generated during production activities due to the production process or accidents. If this chlorine is not effectively treated, it will inevitably cause pollution to the environment.

[0003] Currently, most common chlorine neutralization treatments use alkaline neutralization, which involves introducing chlorine into an alkaline solution to react with the chlorine and convert it into the byproduct chlorate. Although the reaction efficiency between alkaline solution and chlorine is extremely high, typically reaching 99.9%, the reaction time between chlorine and alkaline solution in a single reaction in the conventional reaction equipment used is not long. This means that chlorine needs to be repeatedly circulated into the reaction equipment for treatment, which reduces the reaction efficiency and thus prolongs the overall harmless treatment time of chlorine. Summary of the Invention

[0004] The purpose of this invention is to provide an emergency chlorine gas alkaline solution circulation absorption system and method to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0006] An emergency chlorine gas and alkaline solution circulation absorption system includes a treatment tank and a control panel. The treatment tank is provided with an outlet and an inlet at its upper and lower ends, respectively, and an absorption mechanism is provided inside the treatment tank.

[0007] The absorption mechanism includes a primary absorption component, a connecting 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 upper and lower spaces. The primary absorption component and the secondary absorption component are located on the lower and upper sides of the partition plate, respectively. The connecting pipe connects the upper and lower spaces of the treatment tank, and the openings are close to the partition plate.

[0008] The primary absorption assembly consists of multiple arc plates, which are connected to each other at intervals by a bracket. The vertical cross-section of the arc plates is bent toward the air inlet side.

[0009] The secondary absorption assembly consists of a tall column that completely fills the middle of the upper inner cavity of the treatment tank. The tall column has a spiral groove running through its upper and lower ends around its axis.

[0010] The arc plate includes a full arc plate and a semi-arc plate. The full arc plate is fitted and sealed against the inner wall of the treatment tank and has a circular hole at its center. The semi-arc plate is spaced apart from the inner wall of the treatment tank and has several first vent holes at its center. The semi-arc plate is located at the bottom and is alternately arranged with the full arc plate from bottom to top.

[0011] The tall column has several second vent holes that extend vertically through the planar projection of the spiral groove.

[0012] The guide pipe has a U-shaped structure and the bending point is located on the upper side of the treatment tank. A first spray pipe is also provided in the section connecting the guide 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 equipped 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 guide pipe.

[0013] The upper inner cavity of the treatment tank is also equipped with a spray plate located on the upper side of the tall column, and the spray plate is connected to the external liquid supply mechanism.

[0014] The lower inner cavity of the treatment tank is provided with a drain pipe that communicates with the external liquid storage mechanism. The drain pipe has a "7" shaped structure and an electrically controlled valve is provided at the outlet. Liquid level sensors are provided on both the upper and lower sides of the vertical section of the drain pipe.

[0015] Both the upper and lower inner cavities of the treatment tank are equipped with drain pipes.

[0016] A method for the cyclic absorption of chlorine gas and alkaline solution in an accident, the specific steps of which are as follows:

[0017] Step 1: Use an external liquid supply mechanism or pre-fill the treatment tank with alkaline solution to achieve the appropriate liquid level in the upper and lower inner chambers;

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

[0019] Step 3: After the initial reaction of the first-stage absorption component, the chlorine gas continues to be input into the conduit due to the pressure. The first spray pipe in the conduit extracts and sprays out the new alkaline solution in the upper inner cavity of the treatment tank, which carries out a secondary reaction on the chlorine gas in the conduit. At the same time, the alkaline solution with lower pH value and salt concentration is replenished to the lower inner cavity.

[0020] Step 4: Chlorine gas is introduced into the upper inner cavity of the treatment tank through the conduit, and reacts three times with the alkaline solution in the upper inner cavity of the treatment tank. At the same time, the secondary absorption component controls the rising speed of chlorine gas to increase the reaction time.

[0021] Step 5: The chlorine gas continues upward through the secondary absorption component, and finally reacts with the alkaline solution with the lowest pH value and salt concentration output from the spray plate, and is finally discharged through the exhaust port.

[0022] The present invention has at least the following advantages compared to the prior art:

[0023] By setting up primary and secondary absorption components, the residence time of chlorine gas can be effectively increased when it reacts with alkaline solution in the treatment tank, thereby improving the neutralization effect of chlorine gas. The setting of the guide pipe and spray plate, together with the first spray pipe, can perform secondary treatment of chlorine gas during its spatial transfer, while also replenishing and circulating the alkaline solution to ensure the effectiveness of the reaction. Attached Figure Description

[0024] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of an emergency chlorine gas alkaline solution circulation absorption system according to the present invention.

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

[0027] Processing tank 1, partition plate 11, guide pipe 13, tall column 2, spiral groove 21, first vent 22, full arc plate 3, semi-arc plate 31, round hole 32, second vent 33, first spray pipe 4, spray plate 5, drain pipe 6, and electrically controlled valve 61. Detailed Implementation

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

[0029] Example 1: As Figure 1-2 As shown, an emergency chlorine gas alkaline solution circulation absorption system includes a treatment tank 1 and a control panel. The treatment tank 1 is provided with an outlet and an inlet at its upper and lower ends, respectively, and an absorption mechanism is provided inside the treatment tank 1.

[0030] The absorption mechanism includes a primary absorption component, a guide 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 upper and lower spaces. The primary absorption component and the secondary absorption component are located on the lower and upper sides of the partition plate 11, respectively. The guide pipe 13 connects 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 consists of multiple arc plates, which are connected to each other at intervals by a bracket. The vertical cross-section of the arc plates is bent toward the air inlet side.

[0032] The secondary absorption assembly consists of a tall column 2, which completely fills the middle of the upper inner cavity of the treatment tank 1. The tall column 2 has a spiral groove 21 that runs through the upper and lower ends of the tall column 2 around its axis.

[0033] During chlorine neutralization, the alkaline solution is first injected into the treatment tank 1. The injection method involves setting injection ports on the upper and lower sides of the partition plate 11 of the treatment tank 1 until a suitable liquid level is reached. Then, chlorine gas is introduced through the air inlet. The chlorine gas first enters the lower inner cavity of the treatment tank 1 and is blocked by multiple arc plates in the primary absorption assembly. Because the vertical cross-section of the arc plates bends towards the air inlet, the chlorine gas is blocked, increasing its residence time in the alkaline solution in the lower inner cavity, thus increasing the reaction mixing time. After the chlorine gas reacts with the alkaline solution in the lower inner cavity of the treatment tank 1, it is introduced into the upper inner cavity space of the treatment tank 1 through the guide pipe 13. It is then guided and blocked by the tall column 2 in the secondary absorption assembly. The chlorine gas's residence time in the treatment tank 1 is extended by the blocking effect of the tall column 2 and the guidance of the spiral groove 21, thereby increasing the reaction time with the alkaline solution in the treatment tank 1 to achieve a 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 close and sealed contact with the inner wall of the treatment tank 1 and has a circular hole 32 at its center. The semi-arc plate 31 is separated from the inner wall of the treatment tank 1 and has several first vent holes 22 at its center. The semi-arc plate 31 is located at the bottom and is alternately arranged from bottom to top with the full arc plate 3.

[0035] The tall column 2 has several second vent holes 33 that run vertically through the spiral groove 21 in the planar projection portion.

[0036] The combination of the full arc plate 3 and the semi-arc plate 31 can effectively block and guide the chlorine gas during its ascent. When passing through the semi-arc plate 31, the volume of the gas chamber formed by the continuous transport of chlorine gas will increase, 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, it will be guided and blocked by the full arc plate 3 and continue to be transported upward from the circular hole 32. The first vent hole 22 can send some of the chlorine gas directly upward when it is blocked by the semi-arc plate 31, so as to avoid the gas chamber volume at the semi-arc plate 31 being too large, which would not be able to effectively block and prolong the residence time of the chlorine gas.

[0037] The second vent 33 has the same effect as the first vent 22. It can also divert chlorine gas to a certain extent during the upward transport of chlorine gas from the spiral groove 21, so as to avoid excessive accumulation of chlorine gas in the spiral groove 21 in a short period of time, which would reduce the reaction effect.

[0038] Both the upper and lower inner cavities of the treatment tank 1 are equipped with drain pipes; this allows the existing alkali solution to be drained when it needs to be replaced.

[0039] Example 2: Figure 1-2 As shown, in a further improvement based on Embodiment 1, the guide pipe 13 has an overall U-shaped structure and the bending point is located on the upper side of the treatment tank 1. The guide pipe 13 is connected to the lower inner cavity of the treatment tank 1 by a first spray pipe 4. The first spray pipe 4 is connected to the upper inner cavity of the treatment tank 1 by a conduit and the conduit is equipped 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 guide pipe 13.

[0040] The lower inner cavity of the treatment tank 1 is provided with a drain pipe 6 that is connected to the external liquid storage mechanism. The drain pipe 6 has a "7" shaped structure and an electrically controlled valve 61 is provided at the outlet. Liquid level sensors are provided on both the upper and lower sides of the vertical section of the drain pipe 6.

[0041] To further improve the treatment effect of chlorine and the circulation of alkaline solution, when chlorine passes through the conduit 13, the first spray pipe 4 inside the conduit 13 will spray the alkaline solution in the upper inner cavity of the treatment tank 1 into the conduit 13 through a water pump. At this time, the chlorine will undergo secondary reaction treatment, and the pH value and salt concentration of the alkaline solution at this time are lower than the alkaline solution level in the lower inner cavity of the treatment tank 1. Therefore, it can replace and balance the alkaline solution in the lower inner cavity of the treatment tank 1. Combined with the liquid storage effect of the two liquid level sensors in the drain pipe 6, it can prevent chlorine from leaking through the electronically controlled valve 61. At the same time, when the liquid level in the drain pipe 6 reaches the upper liquid level sensor, the liquid is drained until the liquid level reaches the height of the lower liquid level sensor, thereby balancing the liquid level of the alkaline solution in the lower inner cavity of the treatment tank 1.

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

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

[0044] A method for the cyclic absorption of chlorine gas and alkaline solution in an accident, the specific steps of which are as follows:

[0045] Step 1: Use an external liquid supply mechanism or pre-fill alkaline solution to reach the appropriate liquid level in the upper and lower inner chambers of the treatment tank 1;

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

[0047] Step 3: After the initial reaction of the first-stage absorption component, the chlorine gas continues to be input into the conduit 13 due to the pressure. The first spray pipe 4 in the conduit 13 extracts and sprays out the new alkaline solution in the upper inner cavity of the treatment tank 1, and performs a secondary reaction on the chlorine gas in the conduit 13. At the same time, the alkaline solution with lower pH value and salt concentration is replenished to the lower inner cavity.

[0048] Step 4: Chlorine gas is introduced into the upper inner cavity of the treatment tank 1 through the conduit 13, and reacts three times with the alkaline 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 continues upward through the secondary absorption component, and finally reacts with the alkaline solution with the lowest pH value and salt concentration output from spray plate 5, and is finally discharged 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 invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An emergency chlorine gas and alkaline solution circulation absorption system, comprising a treatment tank and a control panel, wherein the treatment tank is provided with an outlet and an inlet at its upper and lower ends, respectively, characterized in that: The processing tank is equipped with an absorption mechanism; The absorption mechanism includes a primary absorption component, a connecting 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 upper and lower spaces. The primary absorption component and the secondary absorption component are located on the lower and upper sides of the partition plate, respectively. The connecting pipe connects the upper and lower spaces of the treatment tank, and the openings are close to the partition plate. The primary absorption assembly consists of multiple arc plates, which are connected to each other at intervals by a bracket. The vertical cross-section of the arc plates is bent toward the air inlet side. The secondary absorption assembly consists of a tall column that completely fills the middle of the upper inner cavity of the treatment tank. The tall column has a spiral groove running through its upper and lower ends around its axis.

2. The emergency chlorine gas alkaline solution circulation absorption system according to claim 1, characterized in that: The arc plate includes a full arc plate and a semi-arc plate. The full arc plate is fitted and sealed against the inner wall of the treatment tank and has a circular hole at its center. The semi-arc plate is spaced apart from the inner wall of the treatment tank and has several first vent holes at its center. The semi-arc plate is located at the bottom and is alternately arranged with the full arc plate from bottom to top.

3. The emergency chlorine gas alkaline solution circulation absorption system according to claim 2, characterized in that: The tall column has several second vent holes that extend vertically through the planar projection of the spiral groove.

4. The emergency chlorine gas alkaline solution circulation absorption system according to claim 3, characterized in that: The guide pipe has a U-shaped structure and the bending point is located on the upper side of the treatment tank. A first spray pipe is also provided in the section connecting the guide 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 equipped 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 guide pipe.

5. The emergency chlorine gas alkaline solution circulation absorption system according to claim 4, characterized in that: The upper inner cavity of the treatment tank is also equipped with a spray plate located on the upper side of the tall column, and the spray plate is connected to the external liquid supply mechanism.

6. The emergency chlorine gas alkaline solution circulation absorption system according to claim 5, characterized in that: The lower inner cavity of the treatment tank is provided with a drain pipe that communicates with the external liquid storage mechanism. The drain pipe has a "7" shaped structure and an electrically controlled valve is provided at the outlet. Liquid level sensors are provided on both the upper and lower sides of the vertical section of the drain pipe.

7. The emergency chlorine gas alkaline solution circulation absorption system according to claim 6, characterized in that: Both the upper and lower inner cavities of the treatment tank are equipped with drain pipes.

8. A method for the cyclic absorption of chlorine gas and alkaline solution in an accident, characterized in that: Absorption is performed using the absorption system described in any one of claims 1-7, with the following specific steps: Step 1: Use an external liquid supply mechanism or pre-fill the treatment tank with alkaline solution to achieve the appropriate liquid level in the upper and lower inner chambers; Step 2: Chlorine gas is introduced through the air inlet. The chlorine gas is introduced from the lower inner cavity of the treatment tank and reacts with the alkaline solution in the lower inner cavity first. At the same time, the primary absorption component controls the rising speed of the chlorine gas to increase the reaction time. Step 3: After the initial reaction of the first-stage absorption component, the chlorine gas continues to be input into the conduit due to the pressure. The first spray pipe in the conduit extracts and sprays out the new alkaline solution in the upper inner cavity of the treatment tank, which carries out a secondary reaction on the chlorine gas in the conduit. At the same time, the alkaline solution with lower pH value and salt concentration is replenished to the lower inner cavity. Step 4: Chlorine gas is introduced into the upper inner cavity of the treatment tank through the conduit, and reacts three times with the alkaline solution in the upper inner cavity of the treatment tank. At the same time, the secondary absorption component controls the rising speed of chlorine gas to increase the reaction time. Step 5: The chlorine gas continues upward through the secondary absorption component, and finally reacts with the alkaline solution with the lowest pH value and salt concentration output from the spray plate, and is finally discharged through the exhaust port.

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