Carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption device

Abstract

The utility model relates to the technical field of environmental protection, and discloses a carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption device which comprises a primary absorption tower, one side of the primary absorption tower is in pipeline connection with a primary circulating pump, one side of a secondary circulating pump is in pipeline connection with a pit slot, one side of the pit slot is in pipeline connection with a pit pump, and the other side of the pit slot is in pipeline connection with a secondary circulating pump. One side of the primary absorption tower is in pipeline connection with a first heat exchanger, one side of the primary absorption tower is in pipeline connection with an alkali adding pump, and one side of the alkali adding pump is in pipeline connection with an alkali preparation tank. According to the carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption device, a carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption technology is provided by aiming at a series of defects of a traditional packed tower absorption technology, so that short-circuit-free gas-liquid exchange contact, stable PH value control and absorption liquid temperature control can be realized, and the treatment flow is shortened; the occupied area and the investment cost of equipment are reduced, and safe and stable environment-friendly up-to-standard emission is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device. Background Art

[0002] Carbonyl alloy is an alloy material made from ore, crude metal or semi-finished product through carbonyl metallurgical process. In the existing carbonyl alloy production, high-temperature and high-concentration sulfur dioxide and chlorine-containing mixed waste gas will be generated. The treatment method for this type of waste gas usually relies on packed tower absorption device.

[0003] There are many types of packed tower absorption devices on the existing market. For example, a sulfur dioxide waste gas purification and recovery device for an acyl chloride process disclosed in Chinese patent CN206103690U includes a falling film absorber and other structures. However, the existing packed absorption tower has a gas short circuit phenomenon, resulting in low absorption efficiency of mixed waste gas. Relying on multi-stage absorption to achieve standard emission means that the equipment occupies a large area and has a high investment cost. At the same time, the heat load of the high-temperature mixed waste gas is not effectively considered, resulting in secondary escape of residual chlorine in the absorption liquid. Therefore, a carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption device is proposed to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device, which has the advantages of safety and stability, and solves the problem of risk in the safety and stability of the existing packed absorption tower discharge.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned safety and stability purposes, the utility model provides the following technical solutions: a carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device, comprising a primary absorption tower, one side of the pipeline of the primary absorption tower is connected to a primary circulation pump, one side of the pipeline of the primary circulation pump is connected to a pit tank, one side of the pipeline of the pit tank is connected to a pit pump, one side of the pipeline of the primary absorption tower is connected to a first heat exchanger, one side of the pipeline of the primary absorption tower is connected to an alkali adding pump, one side of the pipeline of the alkali adding pump is connected to an alkali preparation tank, one side of the pipeline of the primary absorption tower is connected to a secondary absorption tower, one side of the pipeline of the secondary absorption tower is connected to a second heat exchanger, one side of the pipeline of the secondary absorption tower is connected to a secondary circulation pump, one side of the pipeline of the secondary absorption tower is connected to a tertiary absorption tower, one side of the pipeline of the tertiary absorption tower is connected to a tertiary circulation pump, one side of the pipeline of the tertiary absorption tower is connected to a third heat exchanger, one side of the pipeline of the tertiary absorption tower is connected to a fan, and one side of the pipeline of the fan is connected to an exhaust pipe.

[0008] Preferably, the exhaust pipe is connected to the air outlet of the fan, and the three-stage absorption tower pipeline is connected to the air inlet of the fan.

[0009] Preferably, the first heat exchanger is connected to a primary circulation pump pipeline.

[0010] Preferably, the second heat exchanger is connected to a secondary circulation pump pipeline.

[0011] Preferably, the third heat exchanger is connected to the tertiary circulation pump pipeline.

[0012] Preferably, discharge ports are provided on the outer sides of the primary absorption tower, the secondary absorption tower and the tertiary absorption tower.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device, which has the following beneficial effects:

[0015] The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device proposes a carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption technology by targeting a series of defects in traditional packed tower absorption technology. It can achieve short-circuit-free gas-liquid exchange contact, stable pH value control, absorption liquid temperature control, shorten the treatment process, reduce equipment footprint and investment costs, and achieve safe and stable environmentally friendly emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure between the primary absorption tower and the primary circulation pump of the utility model;

[0018] Figure 3 It is a schematic diagram of the connection structure of the three-stage absorption tower and the three-stage circulation pump of the utility model.

[0019] In the figure: 1. primary absorption tower; 2. primary circulation pump; 3. pit tank; 4. pit pump; 5. first heat exchanger; 6. alkali addition pump; 7. alkali preparation tank; 8. second heat exchanger; 9. secondary absorption tower; 10. secondary circulation pump; 11. tertiary absorption tower; 12. third heat exchanger; 13. tertiary circulation pump; 14. fan; 15. exhaust pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 A carbonylation alloy sulfur dioxide and chlorine-containing waste gas absorption device, comprising a primary absorption tower 1, a first-stage absorption tower 1 having a pipeline connected to a primary circulation pump 2, a first-stage circulation pump 2 having a pipeline connected to a pit trough 3, a first-stage pit trough 3 having a pipeline connected to a pit pump 4, a first-stage absorption tower 1 having a pipeline connected to a first heat exchanger 5, the first heat exchanger 5 being connected to the pipeline of the primary circulation pump 2, a first-stage absorption tower 1 having a pipeline connected to an alkali adding pump 6, a first-stage alkali adding pump 6 having a pipeline connected to an alkali preparation tank 7, a first-stage absorption tower 1 having a pipeline connected to a secondary absorption tower 9, a second-stage absorption tower 9 having a pipeline connected to a second heat exchanger 8, the second heat exchanger 8 being connected to the pipeline of the secondary circulation pump 10 A pipeline on one side of the secondary absorption tower 9 is connected to a secondary circulation pump 10, a pipeline on one side of the secondary absorption tower 9 is connected to a tertiary absorption tower 11, discharge ports are arranged on the outer sides of the primary absorption tower 1, the secondary absorption tower 9 and the tertiary absorption tower 11, a pipeline on one side of the tertiary absorption tower 11 is connected to a tertiary circulation pump 13, a pipeline on one side of the tertiary absorption tower 11 is connected to a third heat exchanger 12, the third heat exchanger 12 is connected to the tertiary circulation pump 13 pipeline, a pipeline on one side of the tertiary absorption tower 11 is connected to a fan 14, a pipeline on one side of the fan 14 is connected to an exhaust pipe 15, the exhaust pipe 15 pipeline is connected to the air outlet of the fan 14, and the pipeline of the tertiary absorption tower 11 is connected to the air inlet of the fan 14.

[0022] It should also be noted that:

[0023] 1. The feed pipe reverse spray absorption mode is adopted to increase the absorption liquid-gas ratio to 10L / m³, improve the single-stage absorption efficiency, and solve the problem of gas short-circuit escape;

[0024] 2. Design the absorption liquid heat exchange device to control the absorption liquid temperature to ≤40℃;

[0025] 3. Control the pH value to be stable at 12 by adding alkali in reverse order to inhibit the secondary escape of free chlorine;

[0026] 4. Through three-level absorption, safe and stable environmentally friendly emission is achieved;

[0027] 5. The main body is made of PERT material, which can achieve high temperature resistance and corrosion resistance, and extend the service life of the equipment.

[0028] The working principle of this embodiment is as follows:

[0029] (1) Flue gas system

[0030] The sulfur dioxide and chlorine-containing waste gas of carbonyl alloy are collected in a main pipe, and then enter the first-stage reverse jet feed pipe. Two-stage reverse jet washing is arranged in the feed pipe, and then enter the tower. After that, the waste gas goes up through the defogger layer of the tower, and enters the second and third-stage reverse jet feed pipes and towers after defogger. The configuration is similar to the previous section, and double-layer special defogger is configured to prevent secondary entrainment. Finally, the waste gas enters the rear-end fan 14, and is sent to the exhaust chimney 15 by the fan 14 to meet the emission standards at high altitude.

[0031] (2) Liquid supply and drainage system

[0032] Absorbent reserve: 1 high-level tank for liquid alkali, into which 30% alkali liquid is added.

[0033] External discharge liquid: 1 waste liquid pit.

[0034] In the absorption system, dosing, drainage and water replenishment are automatically controlled by the pH value and liquid level of the circulating liquid respectively.

[0035] The absorption liquid is replaced and supplemented by reverse alkali replenishment. When the absorption liquid in the primary absorption tower 1 is discharged, the absorption liquid in the secondary absorption tower 9 is sent to the primary tower through a circulation pump, and the absorption liquid in the tertiary absorption tower 11 is sent to the secondary absorption tower 9 through a circulation pump. New alkali solution is replenished in the tertiary absorption tower 11. The pH value of the absorption liquid is stably controlled through the reverse alkali addition technology, and the temperature of the absorption liquid is controlled through the heat exchange device to solve the problem of secondary escape of residual chlorine in the absorption liquid.

[0036] In this embodiment, the alkaline solution absorbent is used, and its main reaction principle is:

[0037] Cl2+2NaOH→ NaCl+NaClO+H2O

[0038] SO2+2NaOH→ Na2 SO3+H2O

[0039] H2SO4+2NaOH→Na2SO4

[0040] HCl+NaOH→NaCl+H2O

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device, comprising a primary absorption tower (1), characterized in that: One side pipeline of the primary absorption tower (1) is connected to a primary circulation pump (2), one side pipeline of the primary circulation pump (2) is connected to a pit tank (3), one side pipeline of the pit tank (3) is connected to a pit pump (4), one side pipeline of the primary absorption tower (1) is connected to a first heat exchanger (5), one side pipeline of the primary absorption tower (1) is connected to an alkali addition pump (6), one side pipeline of the alkali addition pump (6) is connected to an alkali preparation tank (7), one side pipeline of the primary absorption tower (1) is connected to a secondary absorption tower (9), and the secondary absorption tower A pipeline on one side of the secondary absorption tower (9) is connected to a second heat exchanger (8), a pipeline on one side of the secondary absorption tower (9) is connected to a secondary circulation pump (10), a pipeline on one side of the secondary absorption tower (9) is connected to a tertiary absorption tower (11), a pipeline on one side of the tertiary absorption tower (11) is connected to a tertiary circulation pump (13), a pipeline on one side of the tertiary absorption tower (11) is connected to a third heat exchanger (12), a pipeline on one side of the tertiary absorption tower (11) is connected to a fan (14), and a pipeline on one side of the fan (14) is connected to an exhaust pipe (15).

2. The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device according to claim 1, characterized in that: The exhaust pipe (15) pipeline is connected to the air outlet of the fan (14), and the third-stage absorption tower (11) pipeline is connected to the air inlet of the fan (14).

3. The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device according to claim 1, characterized in that: The first heat exchanger (5) is connected to the primary circulation pump (2) through a pipeline.

4. The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device according to claim 1, characterized in that: The second heat exchanger (8) is connected to a secondary circulation pump (10) through a pipeline.

5. The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device according to claim 1, characterized in that: The third heat exchanger (12) is connected to the third-stage circulation pump (13) through a pipeline.

6. The carbonyl alloy sulfur dioxide and chlorine-containing waste gas absorption device according to claim 1, characterized in that: The outer sides of the primary absorption tower (1), the secondary absorption tower (9) and the tertiary absorption tower (11) are all provided with discharge ports.

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