Waste gas recycling system for sodium pyrosulfite production

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a sodium pyrosulfite production waste gas recycling system which comprises a combustion chamber, the exhaust end of the combustion chamber is connected with a first exhaust pipe, and the exhaust end of the combustion chamber is connected with a spraying chamber through the first exhaust pipe; the exhaust end of the spraying chamber is connected with a second exhaust pipe, a water dissolving chamber is fixed to the top end of the combustion chamber, the other end of the second exhaust pipe is connected to the water dissolving chamber, the exhaust end of the water dissolving chamber is connected with a third exhaust pipe, and the third exhaust pipe is connected to the combustion chamber. A circulating pipe is connected to the exhaust end of the spraying chamber, a water pump is fixed to the spraying chamber, the circulating pipe is connected to a water inlet of the water pump, diluted gas floats upwards in the water dissolving chamber to obtain secondarily-purified air, the secondarily-purified air reacts with water to obtain a large number of oxygen molecules, and the oxygen molecules are separated from the water dissolving chamber. And then the gas is circulated into the combustion chamber through the third exhaust pipe for combustion supporting.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a waste gas recycling system for sodium pyrosulfite production. Background Art

[0002] The production of sodium metabisulfite generates a large amount of waste gas, which contains harmful components such as sulfur dioxide. According to environmental protection requirements, it needs to be treated before it can be discharged. Existing treatment equipment often has a combustion chamber. After the combustion chamber burns the sulfide, the exhaust gas needs to enter the purification equipment and be purified by the purification equipment before it can meet the emission standards. The defects are: first, these exhaust gases can actually be reused, and direct discharge will cause waste. Second, even if the purified gas is circulated to the combustion chamber, it is not conducive to combustion because of its low oxygen content. Summary of the invention

[0003] In order to solve the above problems and enable the purified waste gas to be reasonably used, the present invention provides the following technical solutions:

[0004] A waste gas recycling system for sodium metabisulfite production, comprising a combustion chamber, an exhaust end of the combustion chamber is connected to a first exhaust pipe, the exhaust end of the combustion chamber is connected to a spray chamber through the first exhaust pipe, the exhaust end of the spray chamber is connected to a second exhaust pipe, a water-soluble chamber is fixed to the top of the combustion chamber, the other end of the second exhaust pipe is connected to the water-soluble chamber, the exhaust end of the water-soluble chamber is connected to a third exhaust pipe, the third exhaust pipe is connected to the combustion chamber, a circulation pipe is connected to the exhaust end of the spray chamber, a water pump is fixed to the spray chamber, the circulation pipe is connected to the water inlet of the water pump, a water injection pipe is connected to the water outlet of the water pump, the water injection pipe is connected to the water-soluble chamber for injecting water into the water-soluble chamber, and one end of the second exhaust pipe connected to the water-soluble chamber is inserted into a water inlet. In the body, a lifting plate capable of lifting and lowering movement is provided in the spray chamber, a spray pipe is provided above the spray chamber, the lifting plate is parallel to the bottom of the spray pipe, an oxygenation assembly is provided in the spray chamber, the lifting plate is connected to the oxygenation assembly, the oxygenation assembly comprises an oxygenation pipe fixed in the spray chamber and an oxygenation piston slidably assembled in the oxygenation pipe, the top end of the oxygenation pipe passes through the top of the spray chamber and communicates with the external air, the oxygenation piston is upwardly assembled in the oxygenation pipe from the bottom end of the oxygenation pipe, a connecting rod is provided at the bottom end of the oxygenation piston, which is exposed above the lifting plate by the bottom end of the oxygenation pipe, and the bottom end of the connecting rod is connected to the lifting plate, an oxygenation hole is opened on the oxygenation pipe, and the oxygenation hole is located in the spray chamber and below the oxygenation piston.

[0005] As further preferred, the connection end of the second exhaust pipe and the spray chamber is higher than the connection end of the first exhaust pipe and the spray chamber.

[0006] As a further preference, a spray seat is provided on the top of the spray chamber, and there are a plurality of spray pipes, and the top ends of the plurality of spray pipes are commonly connected to the spray seat.

[0007] As further preferred, the lifting plate is a mesh filter plate, and the outer edge of the lifting plate slides up and down on the cavity wall of the spray chamber through a slide rail.

[0008] As a further preferred embodiment, a partition plate is fixed to the bottom of the inner cavity of the spray chamber, and the partition plate is located below the lifting plate. The partition plate is located in the middle of the bottom of the spray chamber and vertically upward, and the bottom of the inner cavity of the spray chamber is divided into a first chamber and a second chamber by the partition plate. The mesh holes of the lifting plate are only distributed above the first chamber, and the connecting end of the circulation pipe and the spray chamber is fixed on the second chamber.

[0009] As a further preferred embodiment, a hinge seat is fixed on the top of the partition plate, and a tilting rod is connected to the hinge seat, one end of the tilting rod extends into the first chamber, tilts upward and is hinged to the bottom surface of the lifting plate, the other end of the tilting rod extends into the second chamber, tilts downward and is welded with a first pull plate, and a second pull plate is welded on the side of the partition plate facing the second chamber, and a tension spring is connected between the first pull plate and the second pull plate, and under the traction of the tension spring, the end of the tilting rod hinged on the bottom surface of the lifting plate is restricted to tilt upward.

[0010] As a further preference, the oxygenation components are divided into several groups, the structures of the oxygenation components in the several groups are consistent, and they are distributed front to back.

[0011] As further preferred, an oxygenation pump is provided above the spray chamber, an air outlet of the oxygenation pump is connected to a main pipe, and top ends of the oxygenation pipes in all the oxygenation assemblies are commonly connected to the main pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. A water-soluble chamber is set up in the system. The exhaust gas generated after combustion in the combustion chamber enters the spray chamber through the first exhaust pipe. After the dust is sprayed by the spray pipe in the spray chamber, the first-level purification is completed. The first-level purified gas is discharged into the water-soluble chamber through the second exhaust pipe and dissolved in water. The waste residue in the gas is dissolved in water by using the hookah principle. The diluted gas floats in the water-soluble chamber to obtain the second-level purified air. The second-level purified air obtains a large amount of oxygen molecules due to the reaction with water, and then circulates to the combustion chamber through the third exhaust pipe for combustion support.

[0014] 2. An oxygen enrichment component is set in the spray chamber. When the exhaust gas after combustion enters the spray chamber for spraying and dust reduction, the oxygen enrichment component has the opportunity to inhale external air into the spray chamber, and after mixing with the exhaust gas components in the spray chamber, it enters the water-soluble chamber together. The oxygen content in the gas after the first-level purification in the spray chamber is improved, and the gas obtained after the second-level purification in the water-soluble chamber is discharged through the second exhaust pipe. Not only the oxygen content is increased, the purification effect is improved, but also when it is sent to the combustion chamber for combustion support, its combustion support effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a waste gas recycling system for sodium metabisulfite production from a front side perspective provided in an embodiment of the present invention;

[0016] Figure 2 A waste gas recycling system for sodium pyrosulfite production provided in an embodiment of the present invention comprises Figure 1 The schematic diagram from the rear side perspective is drawn;

[0017] Figure 3 A waste gas recycling system for sodium pyrosulfite production provided in an embodiment of the present invention comprises Figure 1 The internal schematic diagram of the spray chamber after being cut open is shown;

[0018] Figure 4 A waste gas recycling system for sodium pyrosulfite production provided in an embodiment of the present invention comprises Figure 3 A schematic diagram from another rotating perspective;

[0019] Figure 5 A schematic diagram of a waste gas recycling system for sodium pyrosulfite production provided in an embodiment of the present invention with the left side of a spray chamber cut open;

[0020] Figure 6 A schematic diagram of a spray chamber in a waste gas recycling system for sodium metabisulfite production provided in an embodiment of the present invention after only being cut open.

[0021] In the figure: 1, combustion chamber; 2, first exhaust pipe; 3, spray chamber; 4, second exhaust pipe; 5, water-soluble chamber; 6, third exhaust pipe; 7, circulation pipe; 8, water pump; 9, water injection pipe; 10, lifting plate; 11, spray pipe; 12, oxygenation assembly; 13, oxygenation pipe; 14, oxygenation piston; 15, connecting rod; 16, oxygenation hole; 17, spray seat; 18, partition plate; 19, first chamber; 20, second chamber; 21, hinged seat; 22, lifting rod; 23, first pull plate; 24, second pull plate; 25, tension spring; 26, oxygenation pump; 27, main pipe. DETAILED DESCRIPTION

[0022] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0023] In one embodiment, Figure 1-Figure 6 As shown: This embodiment provides a waste gas recycling system for sodium pyrosulfite production, including a combustion chamber 1, the exhaust end of the combustion chamber 1 is connected to a first exhaust pipe 2, the exhaust end of the combustion chamber 1 is connected to a spray chamber 3 through the first exhaust pipe 2, the exhaust end of the spray chamber 3 is connected to a second exhaust pipe 4, a water-soluble chamber 5 is fixed to the top of the combustion chamber 1, the other end of the second exhaust pipe 4 is connected to the water-soluble chamber 5, the exhaust end of the water-soluble chamber 5 is connected to a third exhaust pipe 6, the third exhaust pipe 6 is connected to the combustion chamber 1, and the exhaust end of the spray chamber 3 is connected to the second exhaust pipe 4. A circulation pipe 7 is connected to the exhaust end, a water pump 8 is fixed on the spray chamber 3, the circulation pipe 7 is connected to the water inlet of the water pump 8, the water outlet of the water pump 8 is connected to a water injection pipe 9, the water injection pipe 9 is connected to the water-soluble chamber 5 for injecting water into the water-soluble chamber 5, one end of the second exhaust pipe 4 connected to the water-soluble chamber 5 is inserted into the water body, a lifting plate 10 capable of lifting and lowering is provided in the spray chamber 3, the lifting plate 10 is a mesh filter plate, the outer edge of the lifting plate 10 slides up and down on the cavity wall of the spray chamber 3 through a slide rail, and a spray is provided above the spray chamber 3. The spray chamber 3 is provided with a spray seat 17 at the top, and the spray pipes 11 are multiple, and the top ends of the multiple spray pipes 11 are connected to the spray seat 17. The spray seat 17 is supplied with water by an external third-party water pump. The lifting plate 10 is parallel to the bottom of the spray pipe 11. The spray chamber 3 is provided with an oxygenation assembly 12, and the lifting plate 10 is connected to the oxygenation assembly 12. The oxygenation assembly 12 includes an oxygenation pipe 13 fixed in the spray chamber 3 and an oxygenation piston 14 slidably assembled in the oxygenation pipe 13. The top end of the oxygenation pipe 13 passes through the spray chamber 3. The top of the chamber 3 is connected to the external air, and the oxygenation piston 14 is assembled in the oxygenation pipe 13 from the bottom end of the oxygenation pipe 13 upwards. The bottom end of the oxygenation piston 14 is provided with a connecting rod 15 which is exposed above the lifting plate 10 by the bottom end of the oxygenation pipe 13. The bottom end of the connecting rod 15 is connected to the lifting plate 10. The oxygenation pipe 13 is provided with an oxygenation hole 16, which is located in the spray chamber 3 and below the oxygenation piston 14. The connecting end of the second exhaust pipe 4 and the spray chamber 3 is higher than the connecting end of the first exhaust pipe 2 and the spray chamber 3.

[0024] A hinge seat 21 is fixed at the top of the partition plate 18, and a tilting rod 22 is connected to the hinge seat 21. One end of the tilting rod 22 extends into the first chamber 19, tilts upward and is hinged to the bottom surface of the lifting plate 10, and the other end of the tilting rod 22 extends into the second chamber 20, tilts downward and is welded with a first pull plate 23. A second pull plate 24 is welded on the side of the partition plate 18 facing the second chamber 20, and a tension spring 25 is connected between the first pull plate 23 and the second pull plate 24. Under the traction of the tension spring 25, the end of the tilting rod 22 hinged on the bottom surface of the lifting plate 10 is restricted to tilt upward.

[0025] The waste gas generated during the production of sodium metabisulfite is burned in the combustion chamber 1 and then enters the spray chamber 3 through the first exhaust pipe 2. After being sprayed by the spray pipe 11 in the spray chamber 3 for dust reduction, the primary purification is completed. The primary purified gas is discharged into the water-soluble chamber 5 through the second exhaust pipe 4 and dissolved in water. By using the hookah principle, the waste residue in the gas is dissolved in water. The diluted gas floats after the secondary purification in the water-soluble chamber 5. The air after the secondary purification will obtain more oxygen molecules after reacting with the moisture in the water-soluble chamber 5, and then circulates to the combustion chamber 1 through the third exhaust pipe 6 for combustion assistance, thereby improving the combustion efficiency. When spraying in the spray chamber 3, the waste residue after dust reduction falls on the lifting plate 10, and the filtered sewage passes through the mesh on the lifting plate 10 and falls into the combustion chamber 1. As the residue on the lifting plate 10 gradually increases, the lifting plate 10 will continue to descend, the left end of the tilting rod 22 deflects downward, and the tension spring 25 at the right end of the tilting rod 22 is pulled upward. When the lifting plate 10 descends, it will also bring the oxygenation piston 14 down, so that the oxygenation pipe 13 generates negative pressure, and uses the negative pressure to suck air into the oxygenation pipe 13. As the oxygenation piston 14 descends to the bottom of the oxygenation hole 16, the oxygenation hole 1 6 is opened, fresh air enters the spray chamber 3, and after being dissolved with the exhaust gas discharged from the first exhaust pipe 2, it participates in the dust reduction in the spray pipe 11. After the first-level dust reduction in the spray pipe 11, a first-level purified gas with a higher oxygen content (original oxygen molecules in the exhaust gas + oxygen molecules in the air supplied by the oxygenation pipe 13 + oxygen molecules in the spray water) is obtained. Since the oxygen content in the first-level purified gas is improved, it is discharged into the water-soluble chamber 5 through the second exhaust pipe 4, and then after being processed by the hookah principle in the water-soluble chamber 5, it is sent to the combustion chamber 1 for combustion-supporting, and its combustion-supporting effect is better.

[0026] Of course, during the actual assembly, a sewage pump will be provided on the lifting plate 10, and a sewage pump will be provided outside the equipment. When the lifting plate 10 is lowered to a certain height, the sewage pump will be started (sewage pumps are provided in most sewage treatment equipment and waste gas treatment equipment, and the prior art will not be repeated here), and the waste residue on the lifting plate 10 will be extracted outward through the sewage pump. When the lifting plate 10 gradually becomes lighter and the weight of the lifting plate 10 is less than the tension of the tension spring 25, the tension spring 25 provides tension to the right end of the tilting rod 22, and deflects the right end of the tilting rod 22 downward, and the left end of the tilting rod 22 deflects upward, and the left end of the tilting rod 22 uses a hinged relationship to push the lifting plate 10 up and reset, and uses the connecting rod 15 to push the increasing The oxygen piston 14 rises, and when the top of the oxygen-enhancing piston 14 rises above the oxygen-enhancing hole 16, the oxygen-enhancing hole 16 is closed, and external air is no longer injected. This embodiment utilizes the lifting action of the lifting plate 10 to realize the automatic injection of air into the spray chamber 3, and utilizes the residue dropped during spraying as a motive force to reduce the load of the lifting plate 10. The existing sewage discharge technology is utilized to make the lifting plate 10 automatically rise with the oxygen-enhancing piston 14 after it becomes light, and the oxygen-enhancing hole 16 is closed in case the lifting plate 10 increases in weight due to residual waste. When it descends again, the oxygen-enhancing piston 14 descends along the oxygen-enhancing pipe 13, forming a negative pressure effect again, and sucking external air into the spray chamber 3 again to increase the oxygen content.

[0027] like Figures 3 to 6 As shown, a partition plate 18 is fixed to the bottom of the inner cavity of the spray chamber 3, and the partition plate 18 is located below the lifting plate 10. The partition plate 18 is located in the middle of the bottom of the spray chamber 3 and vertically upward. The bottom of the inner cavity of the spray chamber 3 is divided into a first chamber 19 and a second chamber 20 by the partition plate 18. The mesh of the lifting plate 10 is only distributed above the first chamber 19, and the connecting end of the circulation pipe 7 and the spray chamber 3 is fixed on the second chamber 20. The sewage generated after spraying is filtered through the mesh on the lifting plate 10 and then leaks into the first chamber 19. After settling in the first chamber 19, the diluted water flows over the top of the partition plate 18 to the second chamber 20, and then is extracted by the water pump 8 and recovered to the water-soluble chamber 5 by the circulation pipe 7. Therefore, the water in the water-soluble chamber 5 comes from the second chamber 20, and the clean water after sewage purification in the second chamber 20. Therefore, the water in the water-soluble chamber 5 is precipitated, which is environmentally friendly and energy-saving. In order to improve the purification quality, the water pump 8 has its own purification function, for example, the water pump 8 is provided with a filter net, etc., which is similar to a pump-type purifier.

[0028] like Figure 3 , Figure 5As shown, in another embodiment, the oxygenation components 12 are divided into several groups, and the structures of the several groups of oxygenation components 12 are consistent and distributed front to back. Since the number of oxygenation components 12 is increased, the efficiency of supplying air to the spray chamber 3 using the oxygenation pipe 13 is improved, that is, the efficiency of mixing oxygen is improved. In this embodiment, an oxygenation pump 26 is provided above the spray chamber 3, and the air outlet end of the oxygenation pump 26 is connected to the main pipe 27. The top ends of the oxygenation pipes 13 in all the oxygenation components 12 are connected to the main pipe 27. The oxygenation pump 26 is used to supply oxygen to the main pipe 27, and the oxygen has pressure. The pressure is used to make the oxygen enter each oxygenation pipe 13. The oxygen in the oxygenation pipe 13 has air pressure. The air pressure acts on the connecting rod 15 through the oxygenation piston 14, and then acts on the lifting plate 10 through the connecting rod 15. The residual air on the lifting plate 10 Once it is heavier, it descends with the assistance of air pressure, and the oxygenation piston 14 is effectively driven to descend through the connecting rod 15, so that the oxygenation hole 16 is quickly opened, and oxygen is injected into the spray chamber 3 to participate in the above-mentioned oxygen assistance. When the lifting plate 10 descends to the limit position, the oxygenation pump 26 is turned off (during actual assembly, a distance sensor is installed at the descending stroke position of the lifting plate 10 to control the opening and closing action of the oxygenation pump 26) and no more air is injected, the left end of the lifting rod 22 turns upward, and the lifting plate 10 is pushed up and reset again, waiting to repeat the next lifting action.

[0029] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0030] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste gas recycling system for sodium metabisulfite production, characterized in that: The invention comprises a combustion chamber (1), wherein the exhaust end of the combustion chamber (1) is connected to a first exhaust pipe (2), the exhaust end of the combustion chamber (1) is connected to a spray chamber (3) through the first exhaust pipe (2), the exhaust end of the spray chamber (3) is connected to a second exhaust pipe (4), a water-soluble chamber (5) is fixed at the top end of the combustion chamber (1), the other end of the second exhaust pipe (4) is connected to the water-soluble chamber (5), the exhaust end of the water-soluble chamber (5) is connected to a third exhaust pipe (6), and the third exhaust pipe (6) is connected to the combustion chamber (1). The spray chamber (1) is provided with a circulation pipe (7) connected to the exhaust end of the spray chamber (3), a water pump (8) is fixed to the spray chamber (3), the circulation pipe (7) is connected to the water inlet of the water pump (8), the water outlet of the water pump (8) is connected to a water injection pipe (9), the water injection pipe (9) is connected to the water-soluble chamber (5) for injecting water into the water-soluble chamber (5), one end of the second exhaust pipe (4) connected to the water-soluble chamber (5) is inserted into the water body, and a lifting plate ( 10), a spray pipe (11) is arranged above the spray chamber (3), the lifting plate (10) is parallel to the bottom of the spray pipe (11), an oxygenation assembly (12) is arranged in the spray chamber (3), the lifting plate (10) is connected to the oxygenation assembly (12), the oxygenation assembly (12) comprises an oxygenation pipe (13) fixed in the spray chamber (3) and an oxygenation piston (14) slidably assembled in the oxygenation pipe (13), the top end of the oxygenation pipe (13) passes through the top of the spray chamber (3) and is connected to the outside The oxygenation piston (14) is assembled in the oxygenation pipe (13) from the bottom end of the oxygenation pipe (13) upwards, and the bottom end of the oxygenation piston (14) is provided with a connecting rod (15) which is exposed from the bottom end of the oxygenation pipe (13) above the lifting plate (10), and the bottom end of the connecting rod (15) is connected to the lifting plate (10). The oxygenation pipe (13) is provided with an oxygenation hole (16), and the oxygenation hole (16) is located in the spray chamber (3) and below the oxygenation piston (14).

2. The waste gas recycling system for sodium metabisulfite production according to claim 1, characterized in that: The connection end between the second exhaust pipe (4) and the spray chamber (3) is higher than the connection end between the first exhaust pipe (2) and the spray chamber (3).

3. The waste gas recycling system for sodium metabisulfite production according to claim 2, characterized in that: A spray seat (17) is provided on the top of the spray chamber (3), and there are a plurality of spray pipes (11), the top ends of which are connected to the spray seat (17).

4. The waste gas recycling system for sodium metabisulfite production according to claim 3, characterized in that: The lifting plate (10) is a mesh filter plate, and the outer edge of the lifting plate (10) slides up and down on the cavity wall of the spray chamber (3) via a slide rail.

5. The waste gas recycling system for sodium metabisulfite production according to claim 4, characterized in that: A partition plate (18) is fixed to the bottom of the inner cavity of the spray chamber (3), the partition plate (18) is located below the lifting plate (10), the partition plate (18) is located in the middle of the bottom of the spray chamber (3) and is vertically upward, and the bottom of the inner cavity of the spray chamber (3) is divided into a first chamber (19) and a second chamber (20) by the partition plate (18), the mesh of the lifting plate (10) is only distributed above the first chamber (19), and the connection end of the circulation pipe (7) and the spray chamber (3) is fixed on the second chamber (20).

6. The waste gas recycling system for sodium metabisulfite production according to claim 5, characterized in that: A hinge seat (21) is fixed at the top of the partition plate (18), and a tilting rod (22) is connected to the hinge seat (21). One end of the tilting rod (22) extends into the first chamber (19), tilts upward and is hinged to the bottom surface of the lifting plate (10). The other end of the tilting rod (22) extends into the second chamber (20), tilts downward and is welded with a first pull plate (23). A second pull plate (24) is welded on the side of the partition plate (18) facing the second chamber (20). A tension spring (25) is connected between the first pull plate (23) and the second pull plate (24). Under the traction of the tension spring (25), one end of the tilting rod (22) hinged on the bottom surface of the lifting plate (10) is restricted to tilt upward. A sewage pipe is installed on the lifting plate (10), and the other end of the sewage pipe extends outside the spray chamber (3) and is connected to a sewage discharge machine.

7. The waste gas recycling system for sodium metabisulfite production according to claim 6, characterized in that: The oxygenation components (12) are divided into several groups, and the structures of the oxygenation components (12) in the several groups are consistent and distributed front to back.

8. The waste gas recycling system for sodium metabisulfite production according to claim 7, characterized in that: An oxygenation pump (26) is provided above the spray chamber (3), the air outlet end of the oxygenation pump (26) is connected to a main pipe (27), and the top ends of the oxygenation pipes (13) in all the oxygenation assemblies (12) are connected to the main pipe (27).

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