CN111167143A - Cooling and conveying technology for waste liquid generated in alkali production by ammonia-soda process - Google Patents
Cooling and conveying technology for waste liquid generated in alkali production by ammonia-soda process Download PDFInfo
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- CN111167143A CN111167143A CN202010037572.2A CN202010037572A CN111167143A CN 111167143 A CN111167143 A CN 111167143A CN 202010037572 A CN202010037572 A CN 202010037572A CN 111167143 A CN111167143 A CN 111167143A
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- Prior art keywords
- waste liquid
- alkali
- cooling
- ammonia
- soda process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a cooling and conveying technology for waste liquid from alkali production by an ammonia-soda process, belonging to the technical field of treatment of waste liquid from alkali production by an ammonia-soda process, and the cooling and conveying technology for waste liquid from alkali production by an ammonia-soda process comprises the following steps: s1, introducing the alkali-making waste liquid into a flash tank, cooling the alkali-making waste liquid in a vacuum flash mode, introducing the gas obtained after flash of the flash tank S2 into a mixed condenser, performing gas-liquid exchange by using circulating water, introducing the gas into the circulating water, evacuating the non-condensable gas by using a water ring vacuum pump, introducing the waste liquid subjected to flash of the flash tank S3 into a mixing barrel, and discharging the waste liquid through a conveying pipeline after stirring. The invention discloses a cooling and conveying technology for waste liquid generated in alkali preparation by an ammonia-soda process, which reduces scaling on the inner wall of a pipeline by increasing the solubility of a waste liquid medium in water.
Description
Technical Field
The invention relates to the technical field of treatment of waste liquid from alkali production by an ammonia-soda process, in particular to a cooling and conveying technology for waste liquid from alkali production by an ammonia-soda process.
Background
In the process of conveying the ammonia-soda process alkali-making waste liquid into the pipeline, the inner wall of the pipeline is easy to scale, scar and block, the pipeline needs to be periodically maintained or even replaced, and the main reason for the easy scaling of the inner wall of the pipeline is that the alkali-making waste liquid has high calcium ion concentration and also contains a certain amount of sulfate ions, Ca ions and the like2+And SO4 2+Formation of crystalline CaSO4·2H2O，CaSO4·2H2O has low solubility, is slightly soluble in water and is easy to form CaSO on the inner wall of the conveying pipeline4·2H2And (4) scaling.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to solve the technical problem of providing a cooling and conveying technology for the waste liquid generated in the alkali production by the ammonia-soda process, wherein CaSO is increased4·2H2The solubility of O in water reduces the scaling of the inner wall of the pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a cooling and conveying technology for waste liquid generated in alkali production by an ammonia-soda process, which comprises the following steps:
s1, introducing the alkali making waste liquid into a flash evaporator, cooling the alkali making waste liquid in a vacuum flash evaporation mode to reduce the temperature of the alkali making waste liquid to between 40 and 60 ℃,
s2, introducing the gas obtained after the flash of the flash tank into a mixed condenser, performing gas-liquid exchange by using circulating water, introducing the gas into the circulating water, exhausting the non-condensable gas by a water ring vacuum pump,
s3, introducing the waste liquid flashed by the flash tank into a mixing barrel, and discharging the waste liquid through a conveying pipeline after stirring;
preferably, the initial temperature of the alkali-making waste liquid before being subjected to temperature reduction treatment by the flash tank is greater than or equal to 86 ℃;
preferably, the water supply pressure of the circulating water of the hybrid condenser is 0.32-0.42 MPa, the water supply temperature is less than or equal to 34 ℃, the water return pressure of the circulating water is 0.20-0.25 MPa, and the water return temperature is less than or equal to 42 ℃;
preferably, the pressure of the hybrid condenser is-0.0055 to-0.0085 MPa;
preferably, the vacuum degree of the flash tank is 0.32-0.42 MPa;
preferably, the temperature of the alkali-making waste liquid in the mixing barrel and the conveying pipeline is 40-60 ℃.
The invention has the beneficial effects that:
according to CaSO4·2H2The dissolving rule of O in water is that the waste liquor from the ammonia still for producing alkali is introducedReducing the temperature to a proper temperature by a vacuum flash evaporation mode, and increasing the CaSO4·2H2The solubility of O in water reduces the scaling of the inner wall of the pipeline.
Drawings
FIG. 1 is a general flow chart of a cooling and conveying technique for waste liquid from ammonia-soda process alkali production according to an embodiment of the present invention;
FIG. 2 is a flow chart of a cooling portion of a waste liquid in a cooling and conveying technique for an ammonia-soda process caustic soda waste liquid according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a cooling effect of a cooling portion of a waste liquid in a cooling and conveying technology for an ammonia-soda process alkali-making waste liquid according to an embodiment of the present invention;
fig. 4 is a pipeline diagram (one month in time limit) of a cooling and conveying technique for ammonia-soda process alkali-making waste liquid provided in the embodiment of the present invention;
fig. 5 is a pipeline diagram (time limit is one year) of a cooling and conveying technology for waste liquid from ammonia-soda process alkali production provided in the embodiment of the present invention;
FIG. 6 shows CaSO in accordance with an embodiment of the present invention4·2H2Solubility of O is tabulated as a function of temperature.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1 to fig. 5, the cooling and conveying technology for the ammonia-soda process alkali production waste liquid provided in this embodiment includes the following steps:
s1, introducing the alkali-making waste liquid into a flash tank, cooling the alkali-making waste liquid in a vacuum flash mode to reduce the temperature of the alkali-making waste liquid to between 40 and 60 ℃, wherein the vacuum degree of the flash tank is 0.32 to 0.42MPa, the temperature of the waste liquid discharged from an ammonia still tower of an ammonia plant in China is generally higher than or equal to 86 ℃, and the temperature of the waste liquid discharged from the CaSO tower is reduced from the CaSO plant4·2H2Table of solubility of O shows CaSO at this time4·2H2The solubility of O is between 0.162 and 0.197, the solubility is low, CaSO4·2H2O is liable to form scale in the pipe by reducing the initial waste liquidWarm treating to reduce the temperature to 40-60 ℃, and passing through CaSO4·2H2Table of solubility of O shows CaSO at this time4·2H2The solubility of O is between 0.205 and 0.210, the solubility is improved, CaSO4·2H2O can be continuously dissolved in water, so that CaSO is reduced4·2H2Generation of O scale due to comprehensive consideration of CaSO4·2H2The solubility of O and the process requirement in the actual production need to keep the temperature of the waste liquid above 40 ℃, so the CaSO can be effectively reduced by only reducing the temperature of the waste liquid to between 40 and 60 DEG C4·2H2The generation of O scale ensures the normal transportation of the pipeline;
s2, introducing a gas-liquid mixture obtained after flash evaporation of the flash evaporator into a mixed condenser, cooling the mixed condenser by circulating water, wherein the pressure of the mixed condenser is-0.0055 to-0.0085 MPa, the circulating water supply pressure of the mixed condenser is 0.32 to 0.42MPa, the water supply temperature is less than or equal to 34 ℃, the return water pressure of the circulating water is 0.20 to 0.25MPa, the obtained return water temperature is less than or equal to 42 ℃, the mixed condenser is in direct contact with cold and hot fluids to transfer heat, the gas enters the circulating water to be subjected to heat dissipation and condensation, and the non-condensable gas is evacuated by a water ring vacuum pump;
s3, introducing the waste liquid flashed by the flash tank into a mixing barrel, arranging a stirring device in the mixing barrel, discharging the waste liquid through a conveying pipeline after stirring the waste liquid, keeping the temperature of the waste liquid in the mixing barrel and the temperature of the waste liquid in the conveying pipeline at 40-60 ℃, and controlling the temperature of the waste liquid in the mixing barrel and the temperature of the waste liquid in the conveying pipeline according to CaSO4·2H2Table of solubility of O shows CaSO at this time4·2H2O is in a higher solubility state, so CaSO is in the mixing tank and in the transport pipeline4·2H2Less O scale formation, CaSO on the tube walls during waste liquid treatment and transport using the present technology, as compared before and after FIGS. 4 and 54·2H2And the scale formation of O is effectively reduced, and the smooth pipeline is ensured.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (6)
1. The utility model provides an ammonia-soda process system alkali waste liquid cooling transport technology which characterized in that: the method comprises the following steps:
s1, introducing the alkali making waste liquid into a flash evaporator, and cooling the alkali making waste liquid in a vacuum flash evaporation mode to reduce the temperature of the alkali making waste liquid to between 40 and 60 ℃;
s2, introducing a gas-liquid mixture obtained after the flash of the flash tank into a mixed condenser, cooling by using circulating water, introducing liquid into the circulating water, and exhausting tail gas by using a water-ring vacuum pump;
and S3, introducing the waste liquid flashed by the flash tank into the mixing barrel, and discharging the waste liquid through a conveying pipeline after stirring.
2. The cooling and conveying technology for the waste liquid from the ammonia-soda process alkali production according to claim 1, characterized in that:
the initial temperature of the alkali-making waste liquid is greater than or equal to 86 ℃ before the alkali-making waste liquid is subjected to temperature reduction treatment by the flash tank.
3. The cooling and conveying technology for the waste liquid from the ammonia-soda process alkali production according to claim 1, characterized in that:
the water supply pressure of the circulating water of the mixed condenser is 0.32-0.42 MPa, and the water supply temperature is less than or equal to 34 ℃;
the return water pressure of the circulating water is 0.20-0.25 MPa, and the return water temperature is less than or equal to 42 ℃.
4. The cooling and conveying technology for the waste liquid from the ammonia-soda process alkali production according to claim 1, characterized in that:
the pressure of the mixed condenser is-0.0055 to-0.0085 MPa.
5. The cooling and conveying technology for the waste liquid from the ammonia-soda process alkali production according to claim 1, characterized in that:
the vacuum degree of the flash tank is 0.32-0.42 MPa.
6. The cooling and conveying technology for the waste liquid from the ammonia-soda process alkali production according to claim 1, characterized in that:
the temperature of the alkali-making waste liquid in the mixing barrel and the conveying pipeline is 40-60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010037572.2A CN111167143A (en) | 2020-01-14 | 2020-01-14 | Cooling and conveying technology for waste liquid generated in alkali production by ammonia-soda process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010037572.2A CN111167143A (en) | 2020-01-14 | 2020-01-14 | Cooling and conveying technology for waste liquid generated in alkali production by ammonia-soda process |
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| CN111167143A true CN111167143A (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941567A (en) * | 2020-07-15 | 2022-01-18 | 湖南中天青鼎工程科技股份有限公司 | Drainage pipeline scale inhibition and removal method for phosphogypsum tailings recycling |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3616833A (en) * | 1967-12-14 | 1971-11-02 | John Moseley Davies | Evaporation of liquor |
| CN109292902A (en) * | 2018-11-02 | 2019-02-01 | 江西晶昊盐化有限公司 | A kind of ammonia-soda process solvay liquor heat recovery technology |
| CN110510821A (en) * | 2019-09-04 | 2019-11-29 | 浙江赛诺正维环境科技有限公司 | The method of ammonia still process biochemical treatment consumer waste infiltration liquid |
-
2020
- 2020-01-14 CN CN202010037572.2A patent/CN111167143A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3616833A (en) * | 1967-12-14 | 1971-11-02 | John Moseley Davies | Evaporation of liquor |
| CN109292902A (en) * | 2018-11-02 | 2019-02-01 | 江西晶昊盐化有限公司 | A kind of ammonia-soda process solvay liquor heat recovery technology |
| CN110510821A (en) * | 2019-09-04 | 2019-11-29 | 浙江赛诺正维环境科技有限公司 | The method of ammonia still process biochemical treatment consumer waste infiltration liquid |
Non-Patent Citations (1)
| Title |
|---|
| 刘光大: "《化工技术进步的经济效益》", 30 April 1989, 中国科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941567A (en) * | 2020-07-15 | 2022-01-18 | 湖南中天青鼎工程科技股份有限公司 | Drainage pipeline scale inhibition and removal method for phosphogypsum tailings recycling |
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