Advanced treatment system for tail gas in wet-process sulfuric acid preparation process
By treating the tail gas through multi-stage washing and ionization, and using hydrogen peroxide to convert the sulfur dioxide in the tail gas into dilute sulfuric acid, the problem of excessive sulfur dioxide emissions in the tail gas treatment of wet sulfuric acid production process is solved, achieving environmentally compliant emissions and resource recovery.
Patent Information
- Application Number
- CN202422766449.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-13
AI Technical Summary
Existing wet sulfuric acid production process tail gas treatment technologies have failed to effectively remove sulfur dioxide, resulting in excessive emissions of waste gas and causing environmental pollution.
The system employs No. 1 and No. 2 tail gas scrubbing towers, an electrostatic demister, a hydrogen peroxide buffer tank, and a circulating pump system to treat the tail gas through multi-stage scrubbing and ionization. 27.5 wt% hydrogen peroxide is used as the reaction reagent to convert SO2 in the tail gas into dilute sulfuric acid for recovery.
It achieves deep removal of sulfur dioxide from exhaust gas, meets emission standards, reduces air pollution, and improves the economic and environmental performance of the equipment.
Smart Images
Figure CN223570925U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of wet method sulfuric acid technology, concretely to wet method sulfuric acid process tail gas deep treatment system. BACKGROUND
[0002] According to the requirement of the new coal chemical process, the state has formulated detailed legal regulations for the waste gas emission of chemical enterprises to control the content of harmful substances (such as sulfur dioxide, nitrogen oxides, hydrogen fluoride, etc.) that may be contained in waste gas. The specific concentration limit of these substances depends on different chemical products and production processes. The standards formulated by the state for coal chemical waste gas emission mainly refer to relevant laws and regulations such as "atmospheric pollution prevention law", "coal chemical industry atmospheric pollutant emission standard", "industrial enterprise pollutant emission standard". In order to ensure that the waste gas emission meets the state standard, the state requires coal chemical enterprises to monitor the key parameters such as concentration, flow, temperature and pressure of waste gas before emission. Coal chemical enterprises should follow the relevant regulations of the state and standardize the waste gas emission to ensure that the waste gas emission meets the national standard. The original wet method sulfuric acid tail gas treatment technology only performs simple treatment and is discharged into the atmospheric environment, causing environmental pollution. It is urgent to carry out technical innovation and transformation to realize standard emission. Therefore, the utility model provides a wet method sulfuric acid process tail gas deep treatment system. CONTENT OF THE UTILITY MODEL
[0003] The utility model aims at providing a wet method sulfuric acid process tail gas deep treatment system to solve the problems in the above background technology.
[0004] In order to realize the above purpose, the utility model provides the following technical scheme: a wet method sulfuric acid process tail gas deep treatment system, comprising a No. 1 tail gas washing tower and a hydrogen peroxide buffer tank, the top of the No. 1 tail gas washing tower is connected with a No. 2 tail gas washing tower through a tail gas inlet and outlet pipe, a No. 1 circulating washing pipeline and a No. 2 circulating washing pipeline are respectively installed on the No. 1 tail gas washing tower and the No. 2 tail gas washing tower, a No. 1 washing circulating pump is installed on the No. 1 circulating washing pipeline, a No. 2 washing circulating pump is installed on the No. 2 circulating washing pipeline, an electrostatic precipitator is connected to the upper end of the No. 2 tail gas washing tower, a hydrogen peroxide inlet pipe is installed at one end of the hydrogen peroxide buffer tank, a hydrogen peroxide pump is connected to the bottom of the hydrogen peroxide inlet pipe, a No. 1 hydrogen peroxide pipe and a No. 2 hydrogen peroxide pipe are installed on the output end of the hydrogen peroxide pump, the other end of the No. 1 hydrogen peroxide pipe is installed on the No. 1 circulating washing pipeline, the other end of the No. 2 hydrogen peroxide pipe is installed on the No. 2 circulating washing pipeline, a communication washing pipe is also installed on the No. 2 circulating washing pipeline, and the end of the communication washing pipe away from the No. 2 circulating washing pipeline is installed on the bottom side of the No. 1 tail gas washing tower.
[0005] As a preferred technical scheme of the utility model, the hydrogen peroxide inlet pipe is internally provided with 27.5wt% hydrogen peroxide.
[0006] As a preferred technical scheme of the utility model, the system further comprises a water storage tank, a first desalted water inlet pipe and a second desalted water inlet pipe, the first desalted water inlet pipe is installed at the bottom of the outer wall of the first tail gas washing tower, the second desalted water inlet pipe is installed on the second circulating washing pipeline, and a desalted water supply pipe is further fixedly installed on the second desalted water inlet pipe, and the other end of the desalted water supply pipe is installed on the water storage tank.
[0007] As a preferred technical scheme of the utility model, the first desalted water inlet pipe and the second desalted water inlet pipe are both provided with desalted water regulating valves.
[0008] As a preferred technical scheme of the utility model, a flushing water pump is further installed on one side of the water storage tank, and the side, away from the water storage tank, of the flushing water pump is connected to the electrostatic mist eliminator.
[0009] As a preferred technical scheme of the utility model, the system further comprises a concentrated sulfuric acid tank, and the concentrated sulfuric acid tank is in communication with the first tail gas washing tower.
[0010] As a preferred technical scheme of the utility model, the first tail gas washing tower and the second tail gas washing tower are both provided with wire mesh mist eliminators.
[0011] Compared with the prior art, the utility model has the beneficial effects that:
[0012] The wet-process sulfuric acid tail gas deep treatment system has the advantages of simple structure, convenient installation and use, full utilization of the washing, ionization and recycling principles, realization of the problems of excessive SO2 emission of the original tail gas, atmospheric environment and on-site pollution, realization of the energy-saving and environmentally-friendly emission target, and improvement of the economic and environmental protection performance of the device operation.
[0013] Other features and advantages of the utility model will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] In the figure: 1, the first exhaust gas washing tower; 2, the second exhaust gas washing tower; 3, electrostatic precipitator; 4, hydrogen peroxide buffer tank; 5, water storage tank; 6, concentrated sulfuric acid tank; 7, the first washing circulating pump; 8, the second washing circulating pump; 9, hydrogen peroxide pump; 10, flushing water pump; 11, the second desalted water inlet pipe; 12, desalted water supply pipe; 13, communication washing pipe; 14, hydrogen peroxide inlet pipe; 15, the first desalted water inlet pipe; 16, exhaust gas inlet and outlet pipe; 17, the first hydrogen peroxide pipe; 18, the second hydrogen peroxide pipe; 19, the first circulating washing pipe; 20, the second circulating washing pipe; 21, desalted water regulating valve. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0017] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0018] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0019] Please refer to Figure 1In the embodiment, a wet-process sulfuric acid tail gas deep treatment system is provided, which comprises a first tail gas washing tower 1 and a hydrogen peroxide buffer tank 4, the top of the first tail gas washing tower 1 is connected with a second tail gas washing tower 2 through a tail gas inlet and outlet pipe 16, a wire mesh demister is arranged in the first tail gas washing tower 1 and the second tail gas washing tower 2, a first circulating washing pipeline 19 and a second circulating washing pipeline 20 are respectively arranged on the first tail gas washing tower 1 and the second tail gas washing tower 2, a first washing circulating pump 7 is arranged on the first circulating washing pipeline 19, a second washing circulating pump 8 is arranged on the second circulating washing pipeline 20, an electrostatic precipitator 3 is connected to the upper end of the second tail gas washing tower 2, a hydrogen peroxide inlet pipe 14 is arranged on one end of the hydrogen peroxide buffer tank 4, 27.5wt hydrogen peroxide is arranged in the hydrogen peroxide inlet pipe 14, a hydrogen peroxide pump 9 is connected to the bottom of the hydrogen peroxide inlet pipe 14, a first hydrogen peroxide pipe 17 and a second hydrogen peroxide pipe 18 are arranged on the output end of the hydrogen peroxide pump 9, one end of the first hydrogen peroxide pipe 17 is arranged on the first circulating washing pipeline 19, one end of the second hydrogen peroxide pipe 18 is arranged on the second circulating washing pipeline 20, and a communication washing pipe 13 is further arranged on the second circulating washing pipeline 20, so as to further improve the washing effect, and one end of the communication washing pipe 13 away from the second circulating washing pipeline 20 is arranged on one side of the bottom of the first tail gas washing tower 1.
[0020] In the embodiment, a water storage tank 5, a first desalted water inlet pipe 15 and a second desalted water inlet pipe 11 are further arranged, the first desalted water inlet pipe 15 is arranged on the bottom of one side of the outer wall of the first tail gas washing tower 1, the second desalted water inlet pipe 11 is arranged on the second circulating washing pipeline 20, a desalted water supplement pipe 12 is further arranged on the second desalted water inlet pipe 11, one end of the desalted water supplement pipe 12 is arranged on the water storage tank 5, a desalted water adjusting valve 21 is arranged on the first desalted water inlet pipe 15 and the second desalted water inlet pipe 11, a flushing water pump 10 is further arranged on one side of the water storage tank 5, and one side of the flushing water pump 10 away from the water storage tank 5 is connected to the electrostatic precipitator 3, the first desalted water inlet pipe 15, the second desalted water inlet pipe 11 and the desalted water supplement pipe 12 can supply desalted water to the water storage tank 5, the first tail gas washing tower 1 and the second tail gas washing tower 2, the water storage tank 5 and the flushing water pump 10 can be used to flush the anode module and the cathode wire after the electrostatic precipitator normally operates for a period of time, the flushing time is usually once a week, and the flushing time is usually 10-20 minutes, the gas distributor at the lower part of the electrostatic precipitator is flushed, and the flushing time is usually 15 minutes, and the flushing time and frequency can be adjusted according to actual needs.
[0021] In the embodiment, a concentrated sulfuric acid tank 6 is further arranged, the concentrated sulfuric acid tank 6 is connected with the first tail gas washing tower 1, and the concentrated sulfuric acid tank 6 is used to recover 40% concentration dilute sulfuric acid in the first tail gas washing tower 1, and the concentration of the concentrated sulfuric acid is adjusted to be in the range of 93%-98%.
[0022] The utility model discloses a wet method sulfuric acid process tail gas, and the residual trace SO2 gas is absorbed by the 27.5wt% hydrogen peroxide as the reaction reagent in the first tail gas washing tower 1 and the second tail gas washing tower 2, and the trace SO2 pollutants in the tail gas are removed, and the oxide of sulfur is converted into dilute sulfuric acid for recycling, and the reaction formula is as follows: SO2 (g) + H2O2→ H2SO4.
[0023] In the processing, first, the tail gas is contacted with the washing liquid sent by the washing circulating pump 7 through the packing layer in the first tail gas washing tower 1, and the SO2 in the tail gas is oxidized. The outlet tail gas enters the second tail gas washing tower 2 through the tail gas inlet and outlet pipe 16, and is fully contacted with the washing liquid through the packing layer, and the secondary deep washing is carried out.
[0024] The clean tail gas after two-stage deep processing is discharged from the top of the second tail gas washing tower 2, enters the electrostatic mist eliminator 3 to remove acid mist and other liquid droplets, and is discharged into the atmosphere through the exhaust pipe to meet the standard SO2≤30. The 27.5wt% hydrogen peroxide is arranged in the hydrogen peroxide inlet pipe 14, and the 27.5wt% hydrogen peroxide in the hydrogen peroxide buffer tank 4 is divided by the hydrogen peroxide pump 9, and is sent to the outlet pipelines of the first washing circulating pump 7 and the second washing circulating pump 8 through the first hydrogen peroxide pipe 17 and the second hydrogen peroxide pipe 18 respectively, and is mixed with the circulating washing liquid in the first circulating washing pipeline 19 and the second circulating washing pipeline 20 in the two-stage washing system respectively, and then the tail gas is washed, so that the problem of excessive discharge of SO2 pollutants in the original tail gas, which pollutes the atmospheric environment and the site, is solved, the energy-saving and environmental protection discharge target is realized, and the economic and environmental protection of the device operation is improved.
[0025] Further, the first tail gas washing tower 1 and the second tail gas washing tower 2 are used for washing the SO2 pollutants in the tail gas by fully countercurrent contact in the packing in the tower by using the washing liquid containing hydrogen peroxide, and the wire mesh demister is arranged at the outlet of each washing tower to prevent the liquid from being carried out by the outlet gas.
[0026] Further, the electrostatic mist eliminator 3 is used to change the alternating current into direct current by the direct current high frequency constant current power supply, and send the direct current to the anode tube bundle and the cathode system of the dust collector, form a strong electric field between the anode tube bundle and the cathode system, and make the wet particles in the tail gas ionized when passing through the anode tube bundle, so that a large number of electrons and positive and negative ions are generated, and the electrons and the ions make directional motion under the action of the electric field force, and form a medium for capturing the wet particles. The above-mentioned wet particles with negative electrons are charged, and make directional motion to the inner panel of the anode tube bundle under the action of the high-voltage electric field force, and the charged particles release electrons on the panel, so that the wet particles are gathered and flow to or are flushed to the circulating liquid system under the electrostatic mist eliminator 3 under the action of gravity, so that the purposes of purification, dust removal and mist removal are achieved.
[0027] Further, the hydrogen peroxide buffer tank 4 and the hydrogen peroxide pump 9 are used to send 27.5% hydrogen peroxide to the first tail gas washing tower 1 and the second tail gas washing tower 2, and remove the SO2 pollutants in the tail gas by the contact reaction in the towers.
[0028] In summary, the wet-process sulfuric acid tail gas deep treatment system has the advantages of simple structure, convenient installation and use, full use of the washing, ionization and recycling process principles, and realization of the purposes of solving the problems of excessive SO2 pollutant emission in the original tail gas, atmospheric environment pollution and on-site pollution, energy saving and environmental protection emission, and improvement of the economic and environmental protection performance of the device operation.
[0029] The basic principles and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only used to illustrate the principles of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.
Claims
1. A system for deep treatment of tail gas from a wet process sulfuric acid process, characterized in that, It includes a tail gas washing tower (1) and a hydrogen peroxide buffer tank (4), the top of the tail gas washing tower (1) is connected with a second tail gas washing tower (2) through a tail gas inlet and outlet pipe (16), a first circulating washing pipeline (19) and a second circulating washing pipeline (20) are respectively installed on the tail gas washing tower (1) and the second tail gas washing tower (2), a first washing circulating pump (7) is installed on the first circulating washing pipeline (19), a second washing circulating pump (8) is installed on the second circulating washing pipeline (20), the upper end of the second tail gas washing tower (2) is connected with an electrostatic precipitator (3), one end of the hydrogen peroxide buffer tank (4) is provided with a hydrogen peroxide inlet pipe (14), the bottom of the hydrogen peroxide inlet pipe (14) is connected with a hydrogen peroxide pump (9), a first hydrogen peroxide pipe (17) and a second hydrogen peroxide pipe (18) are installed on the output end of the hydrogen peroxide pump (9), the other end of the first hydrogen peroxide pipe (17) is installed on the first circulating washing pipeline (19), the other end of the second hydrogen peroxide pipe (18) is installed on the second circulating washing pipeline (20), a communication washing pipe (13) is also installed on the second circulating washing pipeline (20), and the end of the communication washing pipe (13) away from the second circulating washing pipeline (20) is installed on the bottom side of the tail gas washing tower (1).
2. The wet process sulfuric acid process off-gas advanced treatment system of claim 1, wherein, The hydrogen peroxide inlet pipe (14) is provided with 27.5wt% hydrogen peroxide.
3. The wet process sulfuric acid process off-gas advanced treatment system of claim 1, wherein, It also includes a water storage tank (5), a first desalted water inlet pipe (15) and a second desalted water inlet pipe (11), the first desalted water inlet pipe (15) is installed on the bottom of the outer wall of the tail gas washing tower (1), the second desalted water inlet pipe (11) is installed on the second circulating washing pipeline (20), and a desalted water supply pipe (12) is also fixedly installed on the second desalted water inlet pipe (11), and the other end of the desalted water supply pipe (12) is installed on the water storage tank (5).
4. The wet process sulfuric acid process off-gas advanced treatment system of claim 3, wherein, Desalted water regulating valves (21) are arranged on the first desalted water inlet pipe (15) and the second desalted water inlet pipe (11).
5. The wet process sulfuric acid process off-gas advanced treatment system of claim 3, wherein, A flushing water pump (10) is also installed on the side of the water storage tank (5), and the side of the flushing water pump (10) away from the water storage tank (5) is connected to the electrostatic precipitator (3).
6. The wet process sulfuric acid process off-gas advanced treatment system of claim 1, wherein, It also includes a concentrated sulfuric acid tank (6), which is connected with the tail gas washing tower (1).
7. The wet process sulfuric acid process off-gas advanced treatment system of claim 1, wherein, The tail gas washing tower (1) and the second tail gas washing tower (2) are both provided with wire mesh demisters.