CN111362491A - Ash water softening treatment method suitable for coal gasification and treatment device thereof - Google Patents
Ash water softening treatment method suitable for coal gasification and treatment device thereof Download PDFInfo
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- CN111362491A CN111362491A CN201811596208.9A CN201811596208A CN111362491A CN 111362491 A CN111362491 A CN 111362491A CN 201811596208 A CN201811596208 A CN 201811596208A CN 111362491 A CN111362491 A CN 111362491A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to a method and a device for softening ash water suitable for coal gasification. The invention can reduce calcium ions and alkalinity of the grey water, realize softening of the grey water, and greatly reduce scaling and deposition of the system in the recycling process of the softened grey water. Meanwhile, the drainage of the system can be reduced, and the amount of sewage is reduced.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a treatment method and a treatment device for softening ash water suitable for coal gasification.
Background
Adding oxygen into the coal water slurry in a gasification furnace for combustion and carrying out gasification reaction to generate synthesis gas. Discharging the coal slag from the bottom of the gasification furnace to the gasification furnace, discharging the synthetic gas and water vapor containing a small amount of coal ash out of the gasification furnace, washing, and then feeding into a downstream device; after the water discharged by the gasification furnace and part of the water (black water) for washing the synthesis gas are subjected to multi-stage flash evaporation and temperature reduction, the temperature is reduced from more than 200 ℃ to about 50 ℃ to 80 ℃, a flocculating agent is added to enter a slurry settling tank to remove coal ash, and the clarified water (grey water) enters an ash water tank and is recycled to the gasification furnace for washing the coal gas and used as cooling water of the gasification furnace. In the process, only flocculant is added into the settling tank to settle the coal ash, so that the grey water is clarified, and only insoluble substances in the water are removed in the process, and dissolved ions in the water are not removed.
The existing treatment method can only remove suspended matters in the black grey water, can not remove dissolved ions such as calcium ions in the water and reduce the total alkalinity of the grey water, and causes a plurality of problems in the recycling process due to high calcium hardness and alkalinity during recycling, thereby influencing the recycling effect of the grey water.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a treatment method and a treatment device suitable for softening coal gas grey water.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for softening the ash water of coal gas includes such steps as softening the soluble ions in ash water by softening agent to generate insoluble ions, adding flocculant to discharge the insoluble calcium carbonate ions along with coal ash, and reusing the ash water.
Still further, the treatment method suitable for softening the coal gas grey water comprises at least one of calcium hydroxide, calcium oxide, sodium carbonate and sodium hydroxide.
Still further, the treatment method for softening coal gas grey water comprises the steps that the flocculating agent comprises at least one of an organic flocculating agent and an inorganic flocculating agent;
preferably, the flocculant comprises at least one of sodium carbonate, sodium sulfate, sodium silicate, potassium alum, aluminum hydroxide, ferric hydroxide, polymeric ferric sulfate, polymeric aluminum ferric silicate, polymeric aluminum chloride, dicyandiamide-formaldehyde polycondensate, chitosan, sodium carboxymethylcellulose, polyethyleneimine, polyacrylamide;
more preferably, the flocculant comprises at least one of sodium carboxymethylcellulose, polyacrylamide or anionic, cationic, non-ionic derivatives thereof.
Still further, in the treatment method for softening coal gas grey water, the softener is added in an amount of 1ppm to 100000ppm of the flow of the grey water;
preferably, the addition amount of the flocculating agent is 0.1-10ppm of the ash water amount
A device suitable for softening coal gasification grey water comprises a gasification furnace, wherein the output end of the gasification furnace is connected with the input end of a first flash evaporator, the output end of the first flash evaporator is connected with the input end of a second flash evaporator, the output end of the second flash evaporator is connected with the input end of the third flash evaporator, the output ends of the first flash evaporator, the second flash evaporator and the third flash evaporator are communicated to the reaction tank, the input end of the reaction tank is connected with the output end of the transmission pump, the input end of the transmission pump is connected with the input end of the softening agent dissolving tank, the output end of the reaction tank is connected with the input end of the sedimentation tank, the output end of the reaction tank is connected with the output end of the flocculating agent dissolving tank, the output end of the sedimentation tank is communicated to the ash water tank, the output end of the ash water tank is connected to the water return end of the washing tower, and the output end of the washing tower returns to the gasification furnace.
Still further, the device suitable for softening treatment of coal gas grey water is characterized in that: and automatic stirring devices are arranged on the softening agent dissolving tank and the flocculating agent dissolving tank.
Still further, the device suitable for softening treatment of coal gas grey water is characterized in that: and the sedimentation tank is provided with a water replenishing end and a slag discharging end.
By the scheme, the invention at least has the following advantages:
according to the invention, insoluble calcium carbonate can be generated by adding the softening agent into the discharged grey water, and then insoluble calcium carbonate can be discharged from the precipitation tank along with the coal ash by adding the flocculating agent, so that calcium ions and alkalinity of the grey water can be reduced, the grey water can be softened, and scaling and deposition of the system can be greatly reduced in the recycling process of the softened grey water. Meanwhile, the drainage of the system can be reduced, and the amount of sewage is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Examples
A treatment method for softening ash water suitable for coal gasification is characterized by comprising the following steps: firstly, the softener is used for generating insoluble ions from soluble ions in the grey water, and then the flocculant is added to discharge insoluble calcium carbonate and the like along with the coal ash, so that recycled water which can be reused is obtained.
In a preferred embodiment, the softening agent comprises at least one of calcium hydroxide, calcium oxide, sodium carbonate, and sodium hydroxide.
In a preferred embodiment, the flocculant comprises at least one of an organic flocculant and an inorganic flocculant;
preferably, the flocculant comprises at least one of sodium carbonate, sodium sulfate, sodium silicate, potassium alum, aluminum hydroxide, ferric hydroxide, polymeric ferric sulfate, polymeric aluminum ferric silicate, polymeric aluminum chloride, dicyandiamide-formaldehyde polycondensate, chitosan, sodium carboxymethylcellulose, polyethyleneimine, polyacrylamide;
more preferably, the flocculant comprises at least one of sodium carboxymethylcellulose, polyacrylamide or anionic, cationic, non-ionic derivatives thereof.
In a preferred embodiment, the softener is added in an amount of 1ppm to 100000ppm of the flow of grey water;
preferably, the flocculant is added in an amount of 1ppm 10ppm of the flow of grey water.
In the present invention, the softening agent is added at a flow rate of 1ppm, 2ppm, 3ppm, 4ppm, 5ppm, 6ppm, 7ppm, 8ppm, 9ppm, 10ppm, 100ppm, 200 ppm, 300ppm, 400ppm, 500ppm, 600 ppm, 700 ppm, 800 ppm, 900ppm or 100000 ppm. The flocculant addition flow rates were 1.5ppm, 1.8ppm, 2ppm, 2.5ppm, 3ppm, 3.5ppm, 4ppm, 4.5ppm, 5ppm, 6ppm, 8ppm, and 10ppm 15 ppm.
It should be understood that the flocculating agent and the softening agent are two separate types of products, and the two types of products can be used independently or in combination, and when the two types of products are used in combination, the synergistic effect is realized, and the advantages are complemented.
It should be noted that the source of the flocculating agent and the softening agent is not limited in the present invention, and those known to those skilled in the art can be used; if commercially available, the polymer can be prepared by itself by a preparation method known to those skilled in the art.
Example one
As shown in fig. 1, a device suitable for coal gas grey water softening treatment comprises a gasification furnace 1, wherein the output end of the gasification furnace 1 is connected with the input end of a first flash evaporator 2, the output end of the first rotary flash evaporator 2 is connected with the input end of a second flash evaporator 3, the output end of the second flash evaporator 3 is connected with the input end of a third flash evaporator 4, the output ends of the first flash evaporator 2, the second flash evaporator 3 and the third flash evaporator 4 are all communicated to a reaction tank 5, the input end of the reaction tank 5 is connected with the output end of a transfer pump 6, the input end of the transfer pump 6 is connected with the input end of a softening agent dissolving tank 7, the output end of the reaction tank 5 is connected with the input end of a sedimentation tank 8, the output end of the reaction tank 5 is connected with the output end of a flocculating agent dissolving tank 9, the output end of the sedimentation tank 8 is communicated to a grey water tank 10, the output end of the grey water, the output end of the washing tower returns to the water return end of the gasification furnace 1, automatic stirring devices are arranged on the softening agent dissolving tank 7 and the flocculating agent dissolving tank 9, and a water supplementing end and a slag discharging end are arranged on the sedimentation tank 8.
Upon addition of the softener, the soluble ions in water produce the following reaction:
Ca2++2HCO32-+Ca(OH)2the calcium carbonate of = 2CaCO3 ↓ +2H2O is insoluble in water and is discharged out of the system through a sedimentation tank, thereby reducing calcium ions and other inorganic ions in the water, simultaneously reducing bicarbonate ions in the water, and reducing alkalinity in the grey water.
Tests prove that the calcium ions in the grey water can be reduced from more than 1000ppm to less than 300ppm, the alkalinity is greatly reduced, and the scaling problem in the recycling process can be greatly reduced.
According to the invention, insoluble calcium carbonate can be generated by adding the softening agent into the discharged black water, and then the dissolved calcium carbonate plasma can be discharged from the precipitation tank along with the coal ash by adding the flocculating agent, so that the calcium ions and alkalinity of the grey water can be reduced, the grey water can be softened, and the scale formation and deposition of the system can be greatly reduced in the recycling process of the softened grey water. Meanwhile, the drainage of the system can be reduced, and the amount of sewage is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A treatment method for softening ash water suitable for coal gasification is characterized by comprising the following steps: firstly, the soluble ions in the grey water are generated into insoluble ions through a softening agent, and then a flocculating agent is added to discharge the insoluble calcium carbonate plasma along with the coal ash, so that the recyclable grey water is obtained.
2. The method for treating ash water softening for coal gasification in accordance with claim 1, wherein: the softener comprises at least one of calcium hydroxide, calcium oxide, sodium carbonate and sodium hydroxide.
3. The method for treating ash water softening for coal gasification in accordance with claim 1, wherein: the flocculant comprises at least one of an organic flocculant and an inorganic flocculant;
preferably, the flocculant comprises at least one of sodium carbonate, sodium sulfate, sodium silicate, potassium alum, aluminum hydroxide, ferric hydroxide, polymeric ferric sulfate, polymeric aluminum ferric silicate, polymeric aluminum chloride, dicyandiamide-formaldehyde polycondensate, chitosan, sodium carboxymethylcellulose, polyethyleneimine, polyacrylamide;
more preferably, the flocculant comprises at least one of sodium carboxymethylcellulose, polyacrylamide or anionic, cationic, non-ionic derivatives thereof.
4. The method for treating ash water softening for coal gasification in accordance with claim 1, wherein: the adding capacity of the softener is 1ppm-100000ppm of the flow of grey water;
preferably, the addition capacity of the flocculating agent is 0.1 ppm to 10ppm of the capacity of the tar tank.
5. A device suitable for softening coal gas ash water is characterized in that: the device comprises a gasification furnace (1), wherein the output end of the gasification furnace (1) is connected with the input end of a first flash evaporator (2), the gas transmission end of the first flash evaporator (2) is connected with the input end of a second flash evaporator (3), the gas transmission end of the second flash evaporator (3) is connected with the input end of a third flash evaporator (4), the output ends of the first flash evaporator (2), the second flash evaporator (3) and the third flash evaporator (4) are communicated into a reaction tank (5), the input end of the reaction tank (5) is connected with the output end of a transmission pump (6), the input end of the transmission pump (6) is connected with the input end of a softening agent dissolving tank (7), the output end of the reaction tank (5) is connected with the input end of a sedimentation tank (8), the output end of the reaction tank (5) is connected with the output end of a flocculating agent dissolving tank (9), and the output end of the sedimentation tank (8) is communicated into an ash water tank (10), the output end of the ash water tank (12) is connected with the washing tower (11), and water in the washing tower (11) is delivered to the water return end of the gasification furnace (1).
6. The device for softening coal gas grey water according to claim 5, characterized in that: and automatic stirring devices are arranged on the softening agent dissolving tank (7) and the flocculating agent dissolving tank (9).
7. The device for softening coal gas grey water according to claim 1, characterized in that: and a water replenishing end and a slag discharging end are arranged on the sedimentation tank (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811596208.9A CN111362491A (en) | 2018-12-26 | 2018-12-26 | Ash water softening treatment method suitable for coal gasification and treatment device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811596208.9A CN111362491A (en) | 2018-12-26 | 2018-12-26 | Ash water softening treatment method suitable for coal gasification and treatment device thereof |
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| CN111362491A true CN111362491A (en) | 2020-07-03 |
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Citations (7)
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|---|---|---|---|---|
| CN104230010A (en) * | 2014-10-16 | 2014-12-24 | 武汉科梦环境工程有限公司 | Softening method for coal gasification grey water with high temporary hardness |
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| CN206219345U (en) * | 2016-11-22 | 2017-06-06 | 广东石油化工学院 | A kind of processing system for improving Texaco gasifier buck water quality |
| CN106867586A (en) * | 2015-12-14 | 2017-06-20 | 神华集团有限责任公司 | A kind of gasification of coal and gasification installation |
| CN107640862A (en) * | 2016-07-21 | 2018-01-30 | 神华集团有限责任公司 | The processing method and gasification of coal and its system in Heisui River caused by coal gasification |
| CN207313345U (en) * | 2017-08-10 | 2018-05-04 | 通用电气神华气化技术有限公司 | Gasification waste water composite processing system |
| CN209259868U (en) * | 2018-12-26 | 2019-08-16 | 苏州永峰联环保科技有限公司 | A kind of device suitable for coal gas buck sofening treatment |
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2018
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| CN104230010A (en) * | 2014-10-16 | 2014-12-24 | 武汉科梦环境工程有限公司 | Softening method for coal gasification grey water with high temporary hardness |
| CN106867586A (en) * | 2015-12-14 | 2017-06-20 | 神华集团有限责任公司 | A kind of gasification of coal and gasification installation |
| CN107640862A (en) * | 2016-07-21 | 2018-01-30 | 神华集团有限责任公司 | The processing method and gasification of coal and its system in Heisui River caused by coal gasification |
| CN206219345U (en) * | 2016-11-22 | 2017-06-06 | 广东石油化工学院 | A kind of processing system for improving Texaco gasifier buck water quality |
| CN106745986A (en) * | 2016-12-20 | 2017-05-31 | 深圳能源资源综合开发有限公司 | The efficient impurity removal method and system of coal gasification buck |
| CN207313345U (en) * | 2017-08-10 | 2018-05-04 | 通用电气神华气化技术有限公司 | Gasification waste water composite processing system |
| CN209259868U (en) * | 2018-12-26 | 2019-08-16 | 苏州永峰联环保科技有限公司 | A kind of device suitable for coal gas buck sofening treatment |
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| Title |
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| 王晓雷等, 《工业水处理》, pages 65 - 68 * |
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