Chemical waste gas treatment system

Abstract

The invention discloses a chemical waste gas treatment system, belongs to the technical field of chemical waste gas treatment, and solves the problems of low efficiency and incomplete treatment of an existing waste gas treatment method. The input end of the alkaline waste gas collecting induced draft fan is communicated with the alkaline waste gas collecting pipe, and the output end is communicated with the input end of the pickling tower. The output end of the pickling tower and the output end of the alkaline washing tower are both communicated with the input end of the biological treatment unit, the output end of the biological treatment unit is communicated with the input end of the activated carbon adsorption tower, the output end of the activated carbon adsorption tower is communicated with the input end of the air exhaust induced draft fan, and the output end of the air exhaust induced draft fan is communicated with the input end of the coal-fired boiler. The output end of the coal-fired boiler is communicated with the input end of the denitration unit, the output end of the denitration unit is communicated with the input end of the bag-type dust removal unit, the output end of the bag-type dust removal unit is communicated with the input end of the desulfurization unit, and the output end of the desulfurization unit is communicated with the input end of the cyclone. The chemical waste gas treatment device can efficiently and thoroughly treat chemical waste gas.

Description

Technical Field

[0001] The present application relates to the technical field of chemical waste gas treatment, and in particular to a chemical waste gas treatment system. Background Art

[0002] At present, enterprises generate a large amount of harmful waste gas during production and processing. For example, chemical production will generate waste gas containing hydrocarbons such as methane and benzene and trace amounts of H2S. If these waste gases are discharged directly without treatment, they will cause serious pollution to the environment. Traditional waste gas treatment methods often have problems such as low efficiency and incomplete treatment, which are difficult to meet current environmental protection requirements. Summary of the invention

[0003] The embodiment of the present application solves the problems of low efficiency and incomplete treatment of existing waste gas treatment methods by providing a chemical waste gas treatment system.

[0004] The embodiment of the present invention provides a chemical waste gas treatment system, which includes an alkaline waste gas collecting induced draft fan, a pickling tower, an acid waste gas collecting induced draft fan, an alkali washing tower, a biological treatment unit, an activated carbon adsorption tower, an exhaust induced draft fan, a coal-fired boiler, a denitration unit, a bag dust removal unit, a desulfurization unit, a cyclone and a centrifuge; the input end of the alkaline waste gas collecting induced draft fan is connected to the alkaline waste gas collecting pipe, and the output end is connected to the input end of the pickling tower; the input end of the acid waste gas collecting induced draft fan is connected to the acid waste gas collecting pipe, and the output end is connected to the input end of the alkali washing tower; the output end of the pickling tower and the output end of the alkali washing tower are both connected to the input end of the biological treatment unit. The input end of the biological treatment unit is connected to the input end of the activated carbon adsorption tower, the output end of the activated carbon adsorption tower is connected to the input end of the exhaust fan, the output end of the exhaust fan is connected to the input end of the coal-fired boiler, the output end of the coal-fired boiler is connected to the input end of the denitrification unit, the output end of the denitrification unit is connected to the input end of the bag-type dust removal unit, the output end of the bag-type dust removal unit is connected to the input end of the desulfurization unit, the output end of the desulfurization unit is connected to the input end of the cyclone, the output end of the cyclone is connected to the input end of the centrifuge, and the output end of the centrifuge is connected to the drying and packaging system.

[0005] In a possible implementation, the chemical waste gas treatment system also includes a condensate circulation tank and a condensate circulation pump; the input end of the condensate circulation tank is connected to the lower end of the pickling tower, the output end is connected to the input end of the condensate circulation pump, and the output end of the condensate circulation pump is connected to the upper end of the pickling tower.

[0006] In a possible implementation, the chemical waste gas treatment system also includes an alkali condensate circulation tank and an alkali condensate circulation pump; the input end of the alkali condensate circulation tank is connected to the lower end of the alkali washing tower, the output end is connected to the input end of the alkali condensate circulation pump, and the output end of the alkali condensate circulation pump is connected to the upper end of the alkali washing tower.

[0007] In a possible implementation, the chemical waste gas treatment system also includes a pH regulating tank; the output end of the acid condensate circulation pump and the output end of the alkali condensate circulation pump are both connected to the input end of the pH regulating tank, and the output end of the pH regulating tank is connected to the sewage treatment unit.

[0008] In a possible implementation, the desulfurization unit includes a flue gas induced draft fan, a desulfurization tower, a cleaning liquid circulation pump, a circulating oxidation tank, a circulating oxidation pump, a water washing tank, a delivery pump and a cleaning liquid circulation pipe; the input end of the flue gas induced draft fan is connected to the output end of the bag dust removal unit, the output end is connected to the flue gas inlet of the desulfurization tower, and the output end of the desulfurization tower is connected to the input end of the cyclone; the input end of the circulating oxidation tank is connected to the output end of the lower layer liquid accumulator of the desulfurization tower through a gravity flow tube, the output end is connected to the input end of the circulating oxidation pump, and the output end of the circulating oxidation pump is connected to the liquid inlet of the first-stage spray of the desulfurization tower through a circulating oxidation pipe; the input end of the cleaning liquid circulation pump is connected to the desulfurization tower, the output end is connected to the input end of the cleaning liquid circulation pipe, and the output end of the cleaning liquid circulation pipe is connected to the liquid inlet of the second-stage spray of the desulfurization tower; the output end of the water washing tank is connected to the input end of the delivery pump, and the output end of the delivery pump is connected to the liquid inlet of the third-stage spray of the desulfurization tower.

[0009] In a possible implementation, the desulfurization unit also includes an oxidation fan, an oxidation tank delivery pump, an external oxidation tank and a first delivery pump; the output end of the oxidation fan is connected to the oxygen inlet of the circulating oxidation tank; the input end of the oxidation tank delivery pump is connected to the output end of the circulating oxidation tank, and the output end is connected to the input end of the external oxidation tank; the output end of the external oxidation tank is connected to the input end of the first delivery pump, and the output end of the first delivery pump is connected to the input end of the circulating oxidation pipe.

[0010] In a possible implementation, the chemical waste gas treatment system also includes an ammonium sulfate slurry delivery pump, a crystallization tank and a crystallization delivery pump; the input end of the ammonium sulfate slurry delivery pump is connected to the output end of the desulfurization unit, and the output end is connected to the input end of the crystallization tank; the output end of the crystallization tank is connected to the input end of the crystallization delivery pump, and the output end of the crystallization delivery pump is connected to the input end of the cyclone.

[0011] In a possible implementation, the chemical waste gas treatment system also includes a stirrer; the stirrer is disposed in the crystallization tank.

[0012] In a possible implementation, the chemical waste gas treatment system also includes a waste gas condensate collection tank, a waste gas condensate delivery pump and a waste gas condensate pipe; the input end of the waste gas condensate pipe is connected between the output end of the exhaust fan and the input end of the coal-fired boiler, and the output end is connected to the input end of the waste gas condensate collection tank; the output end of the waste gas condensate collection tank is connected to the input end of the waste gas condensate delivery pump, and the output end of the waste gas condensate delivery pump is connected to the sewage treatment unit.

[0013] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0014] The embodiment of the present invention provides a chemical waste gas treatment system, which includes an alkaline waste gas collecting induced draft fan, a pickling tower, an acid waste gas collecting induced draft fan, an alkali washing tower, a biological treatment unit, an activated carbon adsorption tower, an exhaust induced draft fan, a coal-fired boiler, a denitrification unit, a bag dust removal unit, a desulfurization unit, a cyclone and a centrifuge. The input end of the alkaline waste gas collecting induced draft fan is connected to the alkaline waste gas collecting pipe, and the output end is connected to the input end of the pickling tower. The input end of the acid waste gas collecting induced draft fan is connected to the acid waste gas collecting pipe, and the output end is connected to the input end of the alkali washing tower. The output ends of the acid washing tower and the alkali washing tower are both connected to the input end of the biological treatment unit, the output end of the biological treatment unit is connected to the input end of the activated carbon adsorption tower, the output end of the activated carbon adsorption tower is connected to the input end of the exhaust fan, the output end of the exhaust fan is connected to the input end of the coal-fired boiler, the output end of the coal-fired boiler is connected to the input end of the denitrification unit, the output end of the denitrification unit is connected to the input end of the bag dust removal unit, the output end of the bag dust removal unit is connected to the input end of the desulfurization unit, the output end of the desulfurization unit is connected to the input end of the cyclone, the output end of the cyclone is connected to the input end of the centrifuge, and the output end of the centrifuge is connected to the drying and packaging system. The chemical waste gas treatment system provided by the present application first removes acidic gases such as H2S and CH3SH in the alkali washing tower, and removes alkaline gases such as ammonia in the acid washing tower. The odor after chemical washing is fully adsorbed and degraded by the microorganisms in the biological treatment unit, and then the activated carbon in the activated carbon adsorption tower is used to remove organic matter such as non-methane total hydrocarbons to ensure that the waste gas is stable and meets the standards. The waste gas is then transported to the coal-fired boiler for incineration through the exhaust fan. The flue gas after incineration enters the desulfurization unit for treatment and produces a byproduct of ammonium sulfate. The flue gas that meets the standards is discharged, and the byproduct ammonium sulfate enters the drying and packaging system for packaging. The present application can efficiently and thoroughly treat chemical waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a chemical waste gas treatment system provided in an embodiment of the present application.

[0017] Icons: 1- alkaline waste gas collection induced draft fan; 2- acid washing tower; 3- acid condensate circulation tank; 4- acid condensate circulation pump; 5- acid waste gas collection induced draft fan; 6- alkali washing tower; 7- alkali condensate circulation tank; 8- alkali condensate circulation pump; 9- biological treatment unit; 10- activated carbon adsorption tower; 11- exhaust induced draft fan; 12- waste gas condensate collection tank; 13- waste gas condensate delivery pump; 14- coal-fired boiler; 15- denitrification unit; 16- catalytic induced draft fan; 17- bag dust removal unit; 18- flue gas induced draft fan; 19- desulfurization Tower; 20-cleaning liquid circulation pump; 21-oxidation fan; 22-circulating oxidation tank; 23-circulating oxidation pump; 24-oxidation tank delivery pump; 25-outer oxidation tank; 26-first delivery pump; 27-water washing tank; 28-delivery pump; 29-ammonium sulfate slurry delivery pump; 30-crystallization tank; 31-mixer; 32-crystallization delivery pump; 33-cyclone; 34-centrifuge; 35-PH adjustment tank; 36-circulating oxidation pipe; 37-gravity flow pipe; 38-cleaning liquid circulation pipe; 39-waste gas condensate pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0020] like Figure 1 As shown, an embodiment of the present invention provides a chemical waste gas treatment system, which includes an alkaline waste gas collecting induced draft fan 1, a pickling tower 2, an acid waste gas collecting induced draft fan 5, an alkali washing tower 6, a biological treatment unit 9, an activated carbon adsorption tower 10, an exhaust fan 11, a coal-fired boiler 14, a denitrification unit 15, a bag dust removal unit 17, a desulfurization unit, a cyclone 33 and a centrifuge 34.

[0021] In the embodiment of the present application, the input end of the alkaline waste gas collecting induced draft fan 1 is connected to the alkaline waste gas collecting pipe, and the output end is connected to the input end of the acid washing tower 2. The input end of the acid waste gas collecting induced draft fan 5 is connected to the acid waste gas collecting pipe, and the output end is connected to the input end of the alkali washing tower 6. The output end of the acid washing tower 2 and the output end of the alkali washing tower 6 are both connected to the input end of the biological treatment unit 9. The chemical waste gas treatment system provided in the present application performs quality separation treatment according to the nature of the waste gas at the front end. Specifically, the waste gas is separated and collected and treated according to the two categories of acidic waste gas and alkaline waste gas. The acidic gas is treated by the alkali washing tower 6, and the alkaline gas is treated by the acid washing tower 2. After the treatment, they are mixed and treated by the biological treatment unit 9.

[0022] In actual applications, the output end of the biological treatment unit 9 is connected to the input end of the activated carbon adsorption tower 10, the output end of the activated carbon adsorption tower 10 is connected to the input end of the exhaust fan 11, the output end of the exhaust fan 11 is connected to the input end of the coal-fired boiler 14, the output end of the coal-fired boiler 14 is connected to the input end of the denitrification unit 15, the output end of the denitrification unit 15 is connected to the input end of the bag-type dust removal unit 17. Specifically, a catalytic induced draft fan 16 is connected between the output end of the denitrification unit 15 and the input end of the bag-type dust removal unit 17.

[0023] like Figure 1 As shown, the output end of the bag dust removal unit 17 is connected to the input end of the desulfurization unit, the output end of the desulfurization unit is connected to the input end of the cyclone 33, the output end of the cyclone 33 is connected to the input end of the centrifuge 34, and the output end of the centrifuge 34 is connected to the drying and packaging system. The chemical waste gas treatment system provided by the present application first removes acidic gases such as H2S and CH3SH in the alkali washing tower 6, removes alkaline gases such as ammonia in the acid washing tower 2, and the odor after chemical washing is fully adsorbed and degraded by the microorganisms in the biological treatment unit 9, and then the activated carbon in the activated carbon adsorption tower 10 is used to remove organic matter such as non-methane total hydrocarbons to ensure that the waste gas is stable and meets the standards, and then the exhaust fan 11 is used to transport the waste gas to the coal-fired boiler 14 for incineration, and the flue gas after incineration enters the desulfurization unit for treatment and produces byproduct ammonium sulfate, and the qualified flue gas is discharged, and the byproduct ammonium sulfate enters the drying and packaging system for packaging. The present application can efficiently and thoroughly treat chemical waste gas.

[0024] The embodiment of the present invention provides a chemical waste gas treatment system, which includes an alkaline waste gas collecting induced draft fan 1, a pickling tower 2, an acid waste gas collecting induced draft fan 5, an alkali washing tower 6, a biological treatment unit 9, an activated carbon adsorption tower 10, an exhaust induced draft fan 11, a coal-fired boiler 14, a denitrification unit 15, a bag dust removal unit 17, a desulfurization unit, a cyclone 33 and a centrifuge 34. The input end of the alkaline waste gas collecting induced draft fan 1 is connected to the alkaline waste gas collecting pipe, and the output end is connected to the input end of the pickling tower 2. The input end of the acid waste gas collecting induced draft fan 5 is connected to the acid waste gas collecting pipe, and the output end is connected to the input end of the alkali washing tower 6. The output ends of the acid washing tower 2 and the alkali washing tower 6 are both connected to the input end of the biological treatment unit 9, the output end of the biological treatment unit 9 is connected to the input end of the activated carbon adsorption tower 10, the output end of the activated carbon adsorption tower 10 is connected to the input end of the exhaust fan 11, the output end of the exhaust fan 11 is connected to the input end of the coal-fired boiler 14, the output end of the coal-fired boiler 14 is connected to the input end of the denitrification unit 15, the output end of the denitrification unit 15 is connected to the input end of the bag dust removal unit 17, the output end of the bag dust removal unit 17 is connected to the input end of the desulfurization unit, the output end of the desulfurization unit is connected to the input end of the cyclone 33, the output end of the cyclone 33 is connected to the input end of the centrifuge 34, and the output end of the centrifuge 34 is connected to the drying and packaging system. The chemical waste gas treatment system provided by the present application first removes acidic gases such as H2S and CH3SH in the alkali washing tower 6, and removes alkaline gases such as ammonia in the acid washing tower 2. The odor after chemical washing is fully adsorbed and degraded by the microorganisms in the biological treatment unit 9, and then the activated carbon in the activated carbon adsorption tower 10 is used to remove organic matter such as non-methane total hydrocarbons to ensure that the waste gas is stable and meets the standards. The waste gas is then transported to the coal-fired boiler 14 for incineration through the exhaust fan 11. The flue gas after incineration enters the desulfurization unit for treatment and produces a byproduct of ammonium sulfate. The flue gas that meets the standards is discharged, and the byproduct ammonium sulfate enters the drying and packaging system for packaging. The present application can efficiently and thoroughly treat chemical waste gas.

[0025] like Figure 1 As shown, the chemical waste gas treatment system also includes an acid condensate circulation tank 3 and an acid condensate circulation pump 4. The input end of the acid condensate circulation tank 3 is connected to the lower end of the pickling tower 2, and the output end is connected to the input end of the acid condensate circulation pump 4, and the output end of the acid condensate circulation pump 4 is connected to the upper end of the pickling tower 2. In practical applications, after the alkaline gas enters the pickling tower 2, the circulating liquid is evenly distributed by the water distribution pipeline at the top of the pickling tower 2, and passes through the packing layer from top to bottom. The circulating liquid is stored in the acid condensate circulation tank 3, and is sprayed from top to bottom by the acid condensate circulation pump 4, so that the alkaline gas and the circulating liquid are in gas-liquid reverse contact, so that the alkaline gas can fully contact the circulating liquid, thereby ensuring the alkaline gas purification effect.

[0026] Continue to refer to Figure 1As shown, the chemical waste gas treatment system also includes an alkali condensate circulation tank 7 and an alkali condensate circulation pump 8. The input end of the alkali condensate circulation tank 7 is connected to the lower end of the alkali washing tower 6, the output end is connected to the input end of the alkali condensate circulation pump 8, and the output end of the alkali condensate circulation pump 8 is connected to the upper end of the alkali washing tower 6. In practical applications, after the acidic gas enters the alkali washing tower 6, the circulating liquid is evenly distributed by the water distribution pipeline at the top of the alkali washing tower 6, and passes through the packing layer from top to bottom. The circulating liquid is stored in the alkali condensate circulation tank 7, and is sprayed from top to bottom by the alkali condensate circulation pump 8, so that the acidic gas and the circulating liquid are in gas-liquid reverse contact, so that the acidic gas can fully contact the circulating liquid, thereby ensuring the acidic gas purification effect.

[0027] In practical applications, the chemical waste gas treatment system further includes a pH regulating tank 35. The output end of the acid condensate circulation pump 4 and the output end of the alkali condensate circulation pump 8 are both connected to the input end of the pH regulating tank 35, and the output end of the pH regulating tank 35 is connected to the sewage treatment unit. Specifically, when the pH value of the acid condensate circulation tank 3 or the pH value of the alkali condensate circulation tank 7 does not meet the requirements, the pH value can be adjusted by adding a liquid for adjusting the pH value to the acid condensate circulation tank 3 or the alkali condensate circulation tank 7 through the pH regulating tank 35.

[0028] In the embodiment of the present application, the desulfurization unit includes a flue gas induced draft fan 18, a desulfurization tower 19, a cleaning liquid circulation pump 20, a circulating oxidation tank 22, a circulating oxidation pump 23, a washing tank 27, a delivery pump 28 and a cleaning liquid circulation pipe 38. The input end of the flue gas induced draft fan 18 is connected to the output end of the bag dust removal unit 17, the output end is connected to the flue gas inlet of the desulfurization tower 19, and the output end of the desulfurization tower 19 is connected to the input end of the cyclone 33. The input end of the circulating oxidation tank 22 is connected to the output end of the lower layer of the liquid accumulator of the desulfurization tower 19 through the gravity flow pipe 37, the output end is connected to the input end of the circulating oxidation pump 23, and the output end of the circulating oxidation pump 23 is connected to the liquid inlet of the first spray of the desulfurization tower 19 through the circulating oxidation pipe 36. The input end of the cleaning liquid circulation pump 20 is connected to the desulfurization tower 19, the output end is connected to the input end of the cleaning liquid circulation pipe 38, and the output end of the cleaning liquid circulation pipe 38 is connected to the liquid inlet of the second spray of the desulfurization tower 19. The output end of the water washing tank 27 is connected to the input end of the delivery pump 28, and the output end of the delivery pump 28 is connected to the liquid inlet of the three-stage spray of the desulfurization tower 19. Specifically, the desulfurization unit can desulfurize the exhaust gas treated by the bag dust removal unit 17 to convert sulfur dioxide in the exhaust gas into ammonium sulfate particles or other harmless substances, and discharge the flue gas that meets the standards through the discharge port at the top.

[0029] like Figure 1As shown, the desulfurization unit also includes an oxidation fan 21, an oxidation tank delivery pump 24, an oxidation tank outside the tower 25 and a first delivery pump 26. The output end of the oxidation fan 21 is connected to the oxygen inlet of the circulating oxidation tank 22. The input end of the oxidation tank delivery pump 24 is connected to the output end of the circulating oxidation tank 22, and the output end is connected to the input end of the oxidation tank outside the tower 25. The output end of the oxidation tank outside the tower 25 is connected to the input end of the first delivery pump 26, and the output end of the first delivery pump 26 is connected to the input end of the circulating oxidation pipe 36. In practical applications, the oxidation fan 21, the oxidation tank delivery pump 24, the oxidation tank outside the tower 25 and the first delivery pump 26 can fully oxidize the slurry in the desulfurization tower 19, and at the same time, the oxidation tank outside the tower 25 can also play a role in buffering the materials in the desulfurization tower 19.

[0030] Continue to refer to Figure 1 As shown, the chemical waste gas treatment system also includes an ammonium sulfate slurry delivery pump 29, a crystallization tank 30 and a crystallization delivery pump 32. The input end of the ammonium sulfate slurry delivery pump 29 is connected to the output end of the desulfurization unit, and the output end is connected to the input end of the crystallization tank 30. The output end of the crystallization tank 30 is connected to the input end of the crystallization delivery pump 32, and the output end of the crystallization delivery pump 32 is connected to the input end of the cyclone 33. Specifically, the ammonium sulfate slurry delivery pump 29, the crystallization tank 30 and the crystallization delivery pump 32 can further concentrate the byproduct ammonium sulfate produced by the desulfurization unit.

[0031] In practical applications, the chemical waste gas treatment system further includes a stirrer 31. The stirrer 31 is disposed in the crystallization tank 30. The stirrer 31 can promote uniform solution temperature, accelerate the crystallization process, improve crystal quality and uniformity, control crystal growth rate and disperse impurities.

[0032] like Figure 1 As shown, the chemical waste gas treatment system also includes a waste gas condensate collection tank 12, a waste gas condensate delivery pump 13 and a waste gas condensate pipe 39. The input end of the waste gas condensate pipe 39 is connected between the output end of the exhaust fan 11 and the input end of the coal-fired boiler 14, and the output end is connected to the input end of the waste gas condensate collection tank 12. The output end of the waste gas condensate collection tank 12 is connected to the input end of the waste gas condensate delivery pump 13, and the output end of the waste gas condensate delivery pump 13 is connected to the sewage treatment unit. In actual applications, the exhaust gas will carry some water vapor and produce condensate during the transportation through the pipeline, so an exhaust gas condensate pipe 39 is connected between the output end of the exhaust fan 11 and the input end of the coal-fired boiler 14, and a condensate discharge valve is provided on the exhaust gas condensate pipe 39, so that the condensate discharge valve can be opened regularly to collect the condensate through the exhaust gas condensate pipe 39 into the exhaust gas condensate collecting tank 12. When the condensate in the exhaust gas condensate collecting tank 12 is collected to a certain extent, the condensate is transported to the sewage treatment unit through the exhaust gas condensate delivery pump 13.

[0033] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0034] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A chemical waste gas treatment system, characterized in that: It comprises an alkaline waste gas collecting induced draft fan (1), an acid washing tower (2), an acid waste gas collecting induced draft fan (5), an alkaline washing tower (6), a biological treatment unit (9), an activated carbon adsorption tower (10), an exhaust induced draft fan (11), a coal-fired boiler (14), a denitration unit (15), a bag dust removal unit (17), a desulfurization unit, a cyclone (33) and a centrifuge (34); The input end of the alkaline waste gas collecting induced draft fan (1) is connected to the alkaline waste gas collecting pipe, and the output end is connected to the input end of the acid washing tower (2); The input end of the acid waste gas collecting induced draft fan (5) is connected to the acid waste gas collecting pipe, and the output end is connected to the input end of the alkali washing tower (6); The output end of the acid washing tower (2) and the output end of the alkali washing tower (6) are both connected to the input end of the biological treatment unit (9), the output end of the biological treatment unit (9) is connected to the input end of the activated carbon adsorption tower (10), the output end of the activated carbon adsorption tower (10) is connected to the input end of the exhaust fan (11), the output end of the exhaust fan (11) is connected to the input end of the coal-fired boiler (14), the output end of the coal-fired boiler (14) is connected to the input end of the denitration unit (15), the output end of the denitration unit (15) is connected to the input end of the bag dust removal unit (17), the output end of the bag dust removal unit (17) is connected to the input end of the desulfurization unit, the output end of the desulfurization unit is connected to the input end of the cyclone (33), the output end of the cyclone (33) is connected to the input end of the centrifuge (34), and the output end of the centrifuge (34) is connected to the drying and packaging system.

2. The chemical waste gas treatment system according to claim 1, characterized in that: It also includes an acid condensate circulation tank (3) and an acid condensate circulation pump (4); The input end of the acid condensate circulation tank (3) is connected to the lower end of the pickling tower (2), the output end is connected to the input end of the acid condensate circulation pump (4), and the output end of the acid condensate circulation pump (4) is connected to the upper end of the pickling tower (2).

3. The chemical waste gas treatment system according to claim 1, characterized in that: It also includes an alkali condensate circulation tank (7) and an alkali condensate circulation pump (8); The input end of the alkali condensate circulation tank (7) is connected to the lower end of the alkali washing tower (6), the output end is connected to the input end of the alkali condensate circulation pump (8), and the output end of the alkali condensate circulation pump (8) is connected to the upper end of the alkali washing tower (6).

4. The chemical waste gas treatment system according to claim 1, characterized in that: Also includes a pH adjustment tank (35); The output ends of the acid condensate circulation pump (4) and the output ends of the alkali condensate circulation pump (8) are both connected to the input end of the pH regulating tank (35), and the output end of the pH regulating tank (35) is connected to the sewage treatment unit.

5. The chemical waste gas treatment system according to claim 1, characterized in that: The desulfurization unit comprises a flue gas induced draft fan (18), a desulfurization tower (19), a cleaning liquid circulation pump (20), a circulating oxidation tank (22), a circulating oxidation pump (23), a water washing tank (27), a delivery pump (28) and a cleaning liquid circulation pipe (38); The input end of the flue gas induced draft fan (18) is connected to the output end of the bag dust removal unit (17), the output end is connected to the flue gas inlet of the desulfurization tower (19), and the output end of the desulfurization tower (19) is connected to the input end of the cyclone (33); The input end of the circulating oxidation tank (22) is connected to the output end of the lower liquid accumulator of the desulfurization tower (19) through a gravity flow pipe (37), the output end is connected to the input end of the circulating oxidation pump (23), and the output end of the circulating oxidation pump (23) is connected to the liquid inlet of the first-stage spray of the desulfurization tower (19) through a circulating oxidation pipe (36); The input end of the cleaning liquid circulation pump (20) is connected to the desulfurization tower (19), and the output end is connected to the input end of the cleaning liquid circulation pipe (38), and the output end of the cleaning liquid circulation pipe (38) is connected to the liquid inlet of the secondary spray of the desulfurization tower (19); The output end of the water washing tank (27) is connected to the input end of the delivery pump (28), and the output end of the delivery pump (28) is connected to the liquid inlet of the third-stage spray of the desulfurization tower (19).

6. The chemical waste gas treatment system according to claim 5, characterized in that: The desulfurization unit further comprises an oxidation fan (21), an oxidation tank delivery pump (24), an external oxidation tank (25) and a first delivery pump (26); The output end of the oxidation fan (21) is connected to the oxygen inlet of the circulating oxidation tank (22); The input end of the oxidation tank delivery pump (24) is connected to the output end of the circulating oxidation tank (22), and the output end is connected to the input end of the external oxidation tank (25); the output end of the external oxidation tank (25) is connected to the input end of the first delivery pump (26), and the output end of the first delivery pump (26) is connected to the input end of the circulating oxidation pipe (36).

7. The chemical waste gas treatment system according to claim 1, characterized in that: It also includes an ammonium sulfate slurry delivery pump (29), a crystallization tank (30) and a crystallization delivery pump (32); The input end of the ammonium sulfate slurry delivery pump (29) is connected to the output end of the desulfurization unit, and the output end is connected to the input end of the crystallization tank (30); the output end of the crystallization tank (30) is connected to the input end of the crystallization delivery pump (32), and the output end of the crystallization delivery pump (32) is connected to the input end of the cyclone (33).

8. The chemical waste gas treatment system according to claim 7, characterized in that: Also includes a mixer (31); The stirrer (31) is arranged in the crystallization tank (30).

9. The chemical waste gas treatment system according to claim 1, characterized in that: It also includes a waste gas condensate collection tank (12), a waste gas condensate delivery pump (13) and a waste gas condensate pipe (39); The input end of the waste gas condensate pipe (39) is connected between the output end of the exhaust fan (11) and the input end of the coal-fired boiler (14), and the output end is connected to the input end of the waste gas condensate collecting tank (12); the output end of the waste gas condensate collecting tank (12) is connected to the input end of the waste gas condensate delivery pump (13), and the output end of the waste gas condensate delivery pump (13) is connected to the sewage treatment unit.

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