CN212269722U - Device for synchronous desulfurization and decyanation of coal chemical gas-making sewage - Google Patents
Device for synchronous desulfurization and decyanation of coal chemical gas-making sewage Download PDFInfo
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- CN212269722U CN212269722U CN202021368432.5U CN202021368432U CN212269722U CN 212269722 U CN212269722 U CN 212269722U CN 202021368432 U CN202021368432 U CN 202021368432U CN 212269722 U CN212269722 U CN 212269722U
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Abstract
The utility model discloses a device that is used for synchronous desulfurization decyanation of coal chemical industry gas making sewage, throw feeder apparatus and ferrous sulfate including line mixer, mixing reactor, pipe chute precipitator, sour and throw feeder apparatus, the liquid outlet end of line mixer passes through the feed liquor end fixed connection of pipeline with mixing reactor, and fixed mounting has online pH meter between line mixer and the mixing reactor, and the liquid outlet end of mixing reactor passes through the feed liquor end fixed connection of pipeline with the pipe chute precipitator. The utility model discloses a pH value to making gas sewage adjusts, then adds the ferrous sulfide of certain ratio and makes gas the sulphide and the cyanide in the sewage react to separate sewage and precipitate through the pipe chute precipitator, can effectually take off sulphide and cyanide in making gas the sewage, eliminated the biological toxicity of making gas the sewage, guaranteed follow-up biological treatment unit's normal operating.
Description
Technical Field
The utility model relates to an industrial wastewater treatment technical field, in particular to a device for synchronous desulfurization and decyanation of coal chemical industry gas-making sewage.
Background
The coal chemical industry gas making sewage is sewage generated when gas is washed and cooled in a gas washing tower and a dust removal tower, the pollutant components and the concentration in the gas making sewage are greatly different along with different factors such as gasification raw materials, operation conditions and the like, the gas making sewage mainly contains pollutants such as sulfide, cyanide, phenols, ammonia nitrogen, suspended matters and the like, and the gas making sewage is generally treated by adopting a sewage treatment process mainly adopting a biological method. Sulfides and cyanides in the gas-making sewage have strong biological toxicity to activated sludge microorganisms, and generally, when the concentration of the sulfides reaches more than 10mg/L or the concentration of the cyanides reaches more than 5mg/L, the metabolism of the microorganisms can be inhibited, and at the moment, the sewage needs to be subjected to desulfurization and decyanation pretreatment to eliminate the inhibition of the sulfides and the cyanides to the activated sludge microorganisms in a biological treatment unit.
The method for removing the sulfide in the wastewater mainly comprises a chemical precipitation method, a chemical oxidation method and the like; the cyanide removal method mainly comprises an alkaline chlorination method, an electrolysis method and the like, wherein the most commonly used method is the alkaline chlorination method, the gas-making sewage has complex components, the effect is not ideal when the alkaline chlorination method is used for decyanation, the first-stage reaction needs to be carried out at a pH value of more than 10, a large amount of acid and alkali is needed for adjusting the pH value of the sewage, chlorine or sodium hypochlorite belongs to toxic and harmful chemicals, and certain safety risk exists; the removal of sulfide and cyanide needs to be completed in two steps, the equipment configuration of the system is complex, and the operation management requirement is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device that is used for synchronous desulfurization decyanation of coal industry gas making sewage to solve the problem that provides among the above-mentioned background art.
In order to achieve the above object, the present invention provides the following technical solutions: a device for synchronously desulfurizing and decyanating coal chemical gas-making sewage, which comprises a pipeline mixer, a mixing reactor, an inclined tube precipitator, an acid adding device and a ferrous sulfate adding device, the liquid outlet end of the pipeline mixer is fixedly connected with the liquid inlet end of the mixing reactor through a pipeline, an online pH meter is fixedly arranged between the pipeline mixer and the mixing reactor, the liquid outlet end of the mixing reactor is fixedly connected with the liquid inlet end of the inclined tube precipitator through a pipeline, the dosing port of the pipeline mixer is fixedly connected with the liquid outlet end of the acid adding device through a pipeline, the feeding end of the mixing reactor is fixedly connected with the discharging end of the ferrous sulfate adding device, one side fixed mounting of pipeline mixer has the gas making sewage feed liquor pipe, fixed mounting has the electromagnetic flowmeter on the gas making sewage feed liquor pipeline, fixed mounting has the governing valve between electromagnetic flowmeter and the pipeline mixer.
Preferably, the mixing reactor comprises a first tank body and a first paddle type stirrer, the top end of the first tank body is fixedly provided with the first paddle type stirrer, and a paddle of the first paddle type stirrer extends into the first tank body.
Preferably, the pipe chute precipitator comprises a second tank body, an inclined pipe, a water distributor, a water collecting tank, a sludge discharge pump and a conical sludge bucket, wherein the conical sludge bucket is fixedly mounted at the bottom end of the second tank body, a sludge discharge port is formed in the bottom end of the conical sludge bucket, the sludge discharge port is fixedly connected with the sludge discharge pump through a pipeline, the inclined pipe is fixedly mounted at the middle part of the second tank body, the water distributor is fixedly mounted at the bottom of one side of the second tank body, and the water collecting tank and a water outlet are fixedly mounted at the top of the other side of the second tank body.
Preferably, the acid adding device consists of an acid storage tank, a first liquid level meter, an acid dosing metering pump and a first connecting pipe, wherein the first liquid level meter is fixedly mounted on one side of the acid storage tank, a liquid outlet of the acid storage tank is connected with the acid dosing metering pump, the first connecting pipe is fixedly mounted at a liquid outlet of the acid dosing metering pump, and one end of the first connecting pipe is fixedly connected with a dosing port of the pipeline mixer.
Preferably, the ferrous sulfate feeding device is composed of a dissolving tank, a second paddle type stirrer, a second liquid level meter, a ferrous sulfate dosing metering pump and a second connecting pipe, the second liquid level meter is fixedly mounted on one side of the dissolving tank, the second paddle type stirrer is fixedly mounted at the top end of the dissolving tank, a liquid outlet of the dissolving tank is connected with the ferrous sulfate dosing metering pump, a liquid outlet end of the ferrous sulfate dosing metering pump is fixedly connected with one end of the second connecting pipe, and the second connecting pipe is fixedly connected with a feeding end of the mixing reactor.
Preferably, the electromagnetic flow meter, the regulating valve, the pipeline mixer, the acid adding device, the online pH meter, the mixing reactor, the ferrous sulfate adding device and the inclined tube precipitator are all electrically connected with an external power supply through the PLC.
Compared with the prior art, the utility model discloses a technological effect and advantage are:
the utility model discloses a pH value to making gas sewage adjusts, then adds the ferrous sulfide of certain ratio and makes gas the sulphide and the cyanide in the sewage react to separate sewage and precipitate through the pipe chute precipitator, can effectually take off sulphide and cyanide in making gas the sewage, eliminated the biological toxicity of making gas the sewage, guaranteed follow-up biological treatment unit's normal operating.
Drawings
FIG. 1 is a schematic structural diagram of a device for synchronous desulfurization and decyanation of coal chemical gas-making sewage.
FIG. 2 is a process flow diagram of the working principle of the device for synchronous desulfurization and decyanation of coal chemical gas-making sewage.
In the figure: 1. an electromagnetic flow meter; 2. adjusting a valve; 3. a pipeline mixer; 4. an acid adding device;
5. an online pH meter; 6. a mixing reactor; 7. a ferrous sulfate adding device; 8. an inclined tube precipitator.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a device for synchronous desulfurization and decyanation of coal chemical gas-making sewage, which comprises a pipeline mixer 3, a mixing reactor 6, a pipe chute precipitator 8, an acid adding device 4 and a ferrous sulfate adding device 7, wherein the liquid outlet end of the pipeline mixer 3 is fixedly connected with the liquid inlet end of the mixing reactor 6 through a pipeline, an online pH meter 5 is fixedly arranged between the pipeline mixer 3 and the mixing reactor 6, the liquid outlet end of the mixing reactor 6 is fixedly connected with the liquid inlet end of the pipe chute precipitator 8 through a pipeline, a chemical adding port of the pipeline mixer 3 is fixedly connected with the liquid outlet end of the acid adding device 4 through a pipeline, the material inlet end of the mixing reactor 6 is fixedly connected with the material outlet end of the ferrous sulfate adding device 7, a gas-making sewage inlet pipe is fixedly arranged at one side of the pipeline mixer 3, an electromagnetic flowmeter 1 is fixedly arranged on the gas-making sewage inlet pipe, a regulating valve 2 is fixedly arranged between the electromagnetic flowmeter 1 and the pipeline mixer 3;
the mixing reactor 6 comprises a first tank body and a first paddle type stirrer, the first paddle type stirrer is fixedly installed at the top end of the first tank body, a paddle of the first paddle type stirrer extends into the first tank body, and liquid in the mixing reactor 6 is conveniently and fully stirred through the installed first paddle type stirrer, so that uniform mixing is ensured;
the inclined tube precipitator 8 consists of a second tank body, an inclined tube, a water distributor, a water collecting tank, a sludge discharge pump and a conical sludge bucket, wherein the conical sludge bucket is fixedly installed at the bottom end of the second tank body, a sludge discharge port is formed at the bottom end of the conical sludge bucket, the sludge discharge port is fixedly connected with the sludge discharge pump through a pipeline, the inclined tube is fixedly installed in the middle of the second tank body, the water distributor is fixedly installed at the bottom of one side of the second tank body, and the water collecting tank and a water outlet are fixedly installed at the top of the other side of the second tank body;
the acid adding device 4 consists of an acid storage tank, a first liquid level meter, an acid dosing metering pump and a first connecting pipe, wherein the first liquid level meter is fixedly installed on one side of the acid storage tank, a liquid outlet of the acid storage tank is connected with the acid dosing metering pump so as to facilitate metering of the adding amount of acid, the first connecting pipe is fixedly installed at the liquid outlet of the acid dosing metering pump, and one end of the first connecting pipe is fixedly connected with a dosing port of the pipeline mixer 3;
the ferrous sulfate feeding device 7 consists of a dissolving tank, a second paddle type stirrer, a second liquid level meter, a ferrous sulfate dosing metering pump and a second connecting pipe, wherein the second liquid level meter is fixedly installed on one side of the dissolving tank, the second paddle type stirrer is fixedly installed at the top end of the dissolving tank, a liquid outlet of the dissolving tank is connected with the ferrous sulfate dosing metering pump, the ferrous sulfate dosing metering pump is used for conveniently metering the amount of ferrous sulfate, the liquid outlet end of the ferrous sulfate dosing metering pump is fixedly connected with one end of the second connecting pipe, and the second connecting pipe is fixedly connected with the feeding end of the mixing reactor 6;
the electromagnetic flowmeter 1, the regulating valve 2, the pipeline mixer 3, the acid adding device 4, the online pH meter 5, the mixing reactor 6, the ferrous sulfate adding device 7 and the inclined tube precipitator 8 are electrically connected with an external power supply through a PLC (programmable logic controller) which can adopt a PLC controller with the model of Modicon M218.
The utility model discloses a theory of operation:
when the device for synchronous desulfurization and decyanation of coal chemical industry gas-making sewage is required to be used, firstly, the gas-making sewage is conveyed to a pipeline mixer 3 through a sewage pump, the amount of the gas-making sewage flowing into the pipeline mixer 3 is measured through an electromagnetic flowmeter 1 arranged on a pipeline, then an acid dosing metering pump is opened to pump acid (sulfuric acid, hydrochloric acid or phosphoric acid) in an acid dosing device 4 into the pipeline mixer 3, the pH value of effluent of the pipeline mixer 3 is measured in real time according to an online pH meter 5, the flow of the acid dosing metering pump is adjusted according to the pH value of the effluent, the pH value of the effluent of the pipeline mixer 3 is kept between 6.2 and 6.5, the effluent of the pipeline mixer 3 flows into a mixing reactor 6, then a ferrous sulfate dosing pump is opened to dose ferrous sulfate into ferrous sulfate (ferrous sulfate heptahydrate or anhydrous ferrous sulfate can be selected, the dosage of the ferrous sulfate is calculated as the molar ratio of the ferrous sulfate to cyanide is 0.5 to 1, the molar ratio of ferrous iron to sulfide is 1.2 to 1, and the dosage is the sum of the two), pumping the mixture into a mixing reactor 6, and then opening a paddle type stirrer to fully mix the ferrous sulfate and gas-making sewageThe rotating speed of the second blade type stirrer is controlled at 40-60rpm, the reaction time is controlled at 5-10min, the sewage after the reaction of the mixing reactor 6 flows into the inclined tube precipitator 8, and the surface load of the inclined tube precipitator 8 is 2-3m3/(m2H) and the hydraulic retention time is 60-90min, and the settled sewage and the sludge are separated and discharged by adopting gravity sludge discharge or mechanical sludge discharge (which is common in the prior art, is not described in too much detail herein and is well known by persons in the art), so that the desulfurization and decyanation treatment process of the gas-making sewage is completed.
Example 1: a gas making sewage pretreatment project, water treatment amount: 60m3/h。
The gas-making sewage is treated by the technology and the water quality conditions are compared:
| serial number | Index (I) | Unit of | Before treatment | After treatment | Removal rate |
| 1 | pH | 8-9 | 6.2-6.5 | -- | |
| 2 | Sulfide compound | mg/L | ≤40 | ≤5 | ≥87.5％ |
| 3 | Cyanide compounds | mg/L | ≤30 | ≤3 | ≥90％ |
| 4 | Suspended matter | mg/L | ≤100 | ≤30 | ≥70％ |
| 5 | COD | mg/L | ≤1500 | ≤1200 | ≥20％ |
The sulfide of the gas-making sewage before the treatment of the project is as follows: 40mg/L, cyanide: 30mg/L, and after the treatment by the technology, the sulfide in the effluent of the system is: 5mg/L, cyanide: 3mg/L, the removal rate of sulfide and cyanide is 87.5% and 90%, the treated gas-making sewage does not have inhibition effect on activated sludge microorganisms in a subsequent biological treatment unit any more, the subsequent biological treatment unit operates stably, and suspended matters and COD of the sewage before and after treatment are reduced by 70% and 20% respectively;
example 2: b company gas making sewage pretreatment, water treatment amount: 100m3/h。
The gas-making sewage is treated by the technology and the water quality conditions are compared:
| serial number | Index (I) | Unit of | Before treatment | After treatment | Removal rate |
| 1 | pH | 6-9 | 6.2-6.5 | -- | |
| 2 | Sulfide compound | mg/L | ≤50 | ≤5 | ≥90％ |
| 3 | Cyanide compounds | mg/L | ≤30 | ≤3 | ≥90％ |
| 4 | Suspended matter | mg/L | ≤200 | ≤60 | ≥80％ |
| 5 | COD | mg/L | ≤3000 | ≤2700 | ≥10％ |
The sulfide of the gas-making sewage before the treatment of the project is as follows: 50mg/L, cyanide: 30mg/L, and after the treatment by the technology, the sulfide in the effluent of the system is: 5mg/L, cyanide: 3mg/L, the removal rate of sulfide and cyanide is 90% and 90%, the treated gas-making sewage has no inhibition effect on activated sludge microorganisms in the subsequent biological treatment unit, the subsequent biological treatment unit operates stably, and suspended matters and COD of the sewage before and after treatment are respectively reduced by 80% and 10%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (6)
1. A device for synchronously desulfurizing and decyanating coal chemical gas-making sewage comprises a pipeline mixer (3), a mixing reactor (6), an inclined tube precipitator (8), an acid feeding device (4) and a ferrous sulfate feeding device (7),
the liquid outlet end of the pipeline mixer (3) is fixedly connected with the liquid inlet end of the mixing reactor (6) through a pipeline, and an online pH meter (5) is fixedly arranged between the pipeline mixer (3) and the mixing reactor (6);
the liquid outlet end of the mixing reactor (6) is fixedly connected with the liquid inlet end of the inclined tube precipitator (8) through a pipeline;
the dosing port of the pipeline mixer (3) is fixedly connected with the liquid outlet end of the acid dosing device (4) through a pipeline;
the feed end of the mixing reactor (6) is fixedly connected with the discharge end of the ferrous sulfate feeding device (7);
a gas making sewage inlet pipe is fixedly installed on one side of the pipeline mixer (3), and an electromagnetic flowmeter (1) is fixedly installed on the gas making sewage inlet pipe;
and a regulating valve (2) is fixedly arranged between the electromagnetic flowmeter (1) and the pipeline mixer (3).
2. The device for synchronously desulfurizing and decyanating the coal chemical industry gasification wastewater as claimed in claim 1, wherein the mixing reactor (6) comprises a first tank body and a first paddle type stirrer, the first paddle type stirrer is fixedly installed at the top end of the first tank body, and a paddle of the first paddle type stirrer extends into the first tank body.
3. The device for synchronous desulfurization and decyanation of coal chemical gas-making sewage according to claim 1, characterized in that the pipe chute precipitator (8) is composed of a second tank body, a pipe chute, a water distributor, a water collecting tank, a dredge pump and a conical dredge bucket, wherein the conical dredge bucket is fixedly installed at the bottom end of the second tank body, a dredge port is formed in the bottom end of the conical dredge bucket, the dredge port and the dredge pump are fixedly connected through a pipeline, the pipe chute is fixedly installed at the middle part of the second tank body, the water distributor is fixedly installed at the bottom of one side of the second tank body, and the water collecting tank and a water outlet are fixedly installed at the top of the other side of the second tank body.
4. The device for synchronously desulfurizing and decyanating coal chemical gas-making sewage according to claim 1, wherein the acid adding device (4) comprises an acid storage tank, a first liquid level meter, an acid dosing metering pump and a first connecting pipe, the first liquid level meter is fixedly installed on one side of the acid storage tank, a liquid outlet of the acid storage tank is connected with the acid dosing metering pump, the first connecting pipe is fixedly installed on a liquid outlet of the acid dosing metering pump, and one end of the first connecting pipe is fixedly connected with a dosing port of the pipeline mixer (3).
5. The device for synchronous desulfurization and decyanation of coal chemical industry gas making sewage according to claim 1, wherein the ferrous sulfate adding device (7) comprises a dissolving tank, a second paddle type stirrer, a second liquid level meter, a ferrous sulfate dosing metering pump and a second connecting pipe, the second liquid level meter is fixedly installed on one side of the dissolving tank, the second paddle type stirrer is fixedly installed on the top end of the dissolving tank, the liquid outlet of the dissolving tank is connected with the ferrous sulfate dosing metering pump, the liquid outlet end of the ferrous sulfate dosing metering pump is fixedly connected with one end of the second connecting pipe, and the second connecting pipe is fixedly connected with the feeding end of the mixing reactor (6).
6. The device for synchronous desulfurization and decyanation of coal chemical industry gas-making sewage according to claim 1, characterized in that the electromagnetic flowmeter (1), the regulating valve (2), the pipeline mixer (3), the acid adding device (4), the online pH meter (5), the mixing reactor (6), the ferrous sulfate adding device (7) and the inclined tube precipitator (8) are electrically connected with an external power supply through a PLC controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111675388A (en) * | 2020-07-13 | 2020-09-18 | 德州金智环保科技有限公司 | Synchronous desulfurization and decyanation method and device for coal chemical gas-making sewage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111675388A (en) * | 2020-07-13 | 2020-09-18 | 德州金智环保科技有限公司 | Synchronous desulfurization and decyanation method and device for coal chemical gas-making sewage |
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