A tail gas sulfur dioxide acid production recovery system
By using high-pressure water tanks and jets to perform physical transfer of sulfur dioxide and hydrogen peroxide solution and accelerated oxygen reaction in the exhaust gas sulfur dioxide acid production process, the problems of high cost and cumbersome processes are solved, and low cost and high efficiency are achieved The exhaust gas sulfur dioxide is used to produce acid recovery.
Patent Information
- Application Number
- CN201910762962.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-08-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2039-08-19
AI Technical Summary
The existing exhaust gas sulfur dioxide acid production process equipment is costly and cumbersome, and the economic benefits are not high.
Design a sulfur dioxide acid production recovery system for exhaust gas, and physically transfer and chemical reactions of sulfur dioxide and hydrogen peroxide solution in the exhaust gas in the conversion tank through high-pressure water tank and jet. The reaction is accelerated by oxygen to realize the acid production process of sulfuric acid. Low-cost and efficient physical transfer method.
It realizes low-cost and high-efficiency recycling of sulfur dioxide in exhaust gas, which is suitable for industrial production, reduces the cost of acid production equipment and improves the efficiency of acid production.
Smart Images
Figure CN110407181B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a tail gas sulfur dioxide acid production recovery system. Background Art
[0002] In the middle of the last century, more than 80% of sulfur was consumed in the form of sulfuric acid. In addition to the inherent physical and chemical properties of sulfur dioxide, the most economical way to recover sulfur dioxide from smelting flue gas is to make sulfuric acid. The technical reform of smelting process around this topic has gone through a long development process. The key issue of using sulfur dioxide flue gas to make acid is the concentration of sulfur dioxide in the flue gas. From the current technical point of view, acid can be made with a sulfur dioxide concentration as low as 0.2~0.3%, so the concentration problem is not a technical problem, but an economic problem.
[0003] At present, the existing acid production processes include conventional indirect acid production process and direct acid production process, as well as higher-specification LUREC process, pre-conversion process, etc. However, these processes have one thing in common, that is, the high cost of equipment and the cumbersome process of acid production. From the current perspective, the economic benefits of these processes are not high. Summary of the invention
[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a low-cost, high-efficiency tail gas sulfur dioxide acid recovery system.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0006] The present invention is a tail gas sulfur dioxide acid recovery system, which has a gas inlet, a flue gas channel, and a high-pressure water pool connected in sequence. A water replenishment port is provided above the high-pressure water pool, and a plurality of ejectors are arranged at the bottom of the high-pressure water pool. The water outlet end of the ejector is located in the conversion tank.
[0007] The two sides of the ejector of the present invention are respectively provided with a liquid inlet and an oxygen inlet, a hydrogen peroxide solution is arranged in the conversion tank, and the lower part of the conversion tank is connected with the liquid inlet through a conduit.
[0008] The oxygen inlet of the present invention is connected to the oxygen storage via a conduit.
[0009] The upper part of the conversion pool of the present invention is provided with a plurality of spray heads, and the lower part of the conversion pool is pumped with a water pump to spray the solution to the spray heads at the upper part of the conversion pool.
[0010] The upper part of the conversion tank of the present invention is provided with a liquid replenishing port.
[0011] The bottom of the conversion tank of the present invention is provided with a sulfuric acid liquid outlet, and the sulfuric acid liquid outlet is equipped with a valve.
[0012] The conversion tank of the present invention is equipped with a pH detector.
[0013] The present invention is mainly used for recovering sulfur dioxide from tail gas to produce acid. The sulfur dioxide is passed through water to form sulfurous acid for jetting. In the jetting process, it is combined with hydrogen peroxide and oxygen for rapid oxidation to produce sulfuric acid. The present invention adopts physical transfer and completes the chemical reaction in the transfer process. The conversion equipment has low cost, high efficiency and high benefit, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION
[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] Reference Figure 1 As shown, a tail gas sulfur dioxide acid recovery system has a gas inlet 1, a flue gas channel 2, and a high-pressure water pool 3 connected in sequence. The high-pressure water pool 3 has a water supply port 31 above it. A plurality of ejectors 4 are arranged at the bottom of the high-pressure water pool 3. The water outlet end of the ejector 4 is located in the conversion pool 5. The tail gas sulfur dioxide enters the flue gas channel 2 from the gas inlet 1, enters the high-pressure water pool 3 after passing through the flue gas channel 2, and dissolves in water to form sulfurous acid. Under the pressure of the water head difference, the sulfurous acid at the bottom of the high-pressure water pool 3 is ejected downward from the ejector 4, enters the conversion pool 5, and completes the conversion reaction of sulfuric acid with the hydrogen peroxide solution.
[0017] Specifically, there are a liquid inlet 41 and an oxygen inlet 42 on both sides of the ejector 4, and a hydrogen peroxide solution is arranged in the conversion tank 5. The lower part of the conversion tank 5 is connected to the liquid inlet 41 through a conduit. Under the negative pressure suction action of the ejector 4, the hydrogen peroxide solution in the conversion tank 5 will be siphoned into the ejector 4 to mix and react with sulfurous acid, partially forming sulfuric acid, and then the mixed liquid is sprayed into the conversion tank 5. The conversion tank 5 is a semi-sealed tank body, and the end of the ejector 4 enters the conversion tank 4. The sprayed sulfurous acid and the partially converted sulfuric acid solution contact a large area of hydrogen peroxide solution before decomposition, and the reaction is completed immediately.
[0018] Since the amount of hydrogen peroxide solution is large, it is necessary to keep the hydrogen peroxide solution in full contact with the continuously ejected sulfurous acid before the reaction is complete. Therefore, a plurality of spray heads 51 are arranged on the upper part of the conversion tank 5. The solution is pumped by the water pump 7 at the lower part of the conversion tank 5 and sprayed at the spray head 51 at the upper part of the conversion tank 5. The position of the spray head 51 should be higher than the water outlet end of the ejector 4, that is, the hydrogen peroxide solution is ejected from the spray head 51 in a fan shape. The hydrogen peroxide solution ejected from the plurality of spray heads 51 forms a water curtain to cover the mixed solution ejected from the ejector 4, which can not only accelerate the reaction but also inhibit the decomposition of sulfurous acid.
[0019] In order to further accelerate the acid-making reaction of sulfurous acid, the oxygen inlet 42 is connected to the oxygen storage 6 through a conduit, so that most of the sulfurous acid can complete the acid-making reaction during the jetting process, thereby accelerating the conversion efficiency.
[0020] The conversion tank 5 is provided with a pH detector 10. Multiple pH detectors 10 can be arranged in the longitudinal position of the conversion tank 5 to detect the pH value of the solution at different levels. The pH value of the mixed solution in the conversion tank 5 is detected. Since hydrogen peroxide is weakly acidic, its pH value is about 4-5, and the pH value of the dilute sulfuric acid obtained by the reaction is between 0-2. As the concentration of dilute sulfuric acid increases, the pH value decreases. Therefore, when the pH value is detected to be less than 1, the solution inside the conversion tank 5 can be discharged. Specifically, a sulfuric acid liquid outlet 9 is provided at the bottom of the conversion tank 5, and the sulfuric acid liquid outlet 9 is provided with a valve 91. The valve 91 can be a magnetic electric valve.
[0021] In the process of discharging sulfuric acid, the conversion tank 5 should be supplemented with hydrogen peroxide solution, so a liquid replenishing port 8 is provided on the upper part of the conversion tank 5 to replenish the solution in real time.
[0022] In addition, if the tail gas entering the flue gas channel 2 is high-temperature tail gas, a condenser 21 can be arranged in the flue gas channel 2 just above the high-pressure water pool 3 to cool the high-temperature tail gas passing through, and the water formed during the cooling process falls into the high-pressure water pool 3. At the same time, the flue gas channel 2 should be directly inserted into the bottom of the high-pressure water pool 3 so that the sulfur dioxide gas is fully dissolved in the water and can be quickly discharged through the ejector 4.
[0023] In order to prevent the pressure of the conversion tank 5 from being too high, an exhaust port 58 extending upward may be provided on the lowermost side wall of the conversion tank 5 so that other inert gases contained in the tail gas sulfur dioxide can be discharged and the ejector 4 can work normally.
[0024] It should be understood that the technical scope of the present invention is not limited to the contents of the specification. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.
Claims
1. A tail gas sulfur dioxide acid production recovery system, characterized by: The invention comprises a gas inlet (1), a flue gas passage (2), and a high-pressure water pool (3) which are connected in sequence. The top of the high-pressure water pool (3) is provided with a water supply port (31). The bottom of the high-pressure water pool (3) is provided with a plurality of ejectors (4). The water outlet end of the ejectors (4) is located in a conversion pool (5). The two sides of the ejectors (4) are respectively provided with a liquid inlet (41) and an oxygen inlet (42). A hydrogen peroxide solution is arranged in the conversion pool (5).
2. The tail gas sulfur dioxide acid production recovery system according to claim 1, characterized in that: The lower part of the conversion tank (5) is connected to the liquid inlet (41) via a conduit.
3. A tail gas sulfur dioxide acid production recovery system according to claim 2, characterized in that: The oxygen inlet (42) is connected to the oxygen storage (6) via a conduit.
4. A tail gas sulfur dioxide acid production recovery system according to claim 1, 2 or 3, characterized in that: A plurality of spray heads (51) are arranged on the upper part of the conversion tank (5), and a solution is drawn from the lower part of the conversion tank (5) by a water pump (7) and sprayed to the spray heads (51) on the upper part of the conversion tank (5).
5. A tail gas sulfur dioxide acid production recovery system according to claim 4, characterized in that: The upper portion of the conversion tank (5) is provided with a liquid replenishment port (8).
6. A tail gas sulfur dioxide acid production recovery system according to claim 4, characterized in that: A sulfuric acid liquid outlet (9) is provided at the bottom of the conversion tank (5), and the sulfuric acid liquid outlet (9) is provided with a valve (91).
7. A tail gas sulfur dioxide acid production recovery system according to claim 6, characterized in that: The conversion tank (5) is provided with a pH detector (10).