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On September 19, the key scientific and technological project of China National Offshore Oil Group Co.
, Ltd.
undertaken by Shandong Haihua Group Calcium Chloride Plant-calcium chloride production anti-scaling technology research passed expert acceptance
.
This subject extended the continuous operation period of the calcium chloride production system from 35 days to 135 days, and the scale thickness of the heating chamber in one operation period was only 0.
49 mm, which reached the leading level in the same industry in China
.
? Industrial application results show that when the feed concentration of the calcium chloride production system is ≧18%, the production system can run continuously for 135 days after the calcium sulfate crystals are returned to the production system, and the scar thickness is up to 0.
49 mm, which is better than the assessment indicators.
The goal of continuous operation for 105 days in one cycle, and the thickness of the heating tube fouling does not exceed 0.
5 mm
.
One ton of calcium chloride saves 178.
5 kilograms of steam, saves 17 kilowatt-hours of electricity, reduces the number of cleanings 6 times a year, and can increase economic benefits by 4.
47 million yuan per year, which has an important demonstration effect on energy saving and consumption reduction
.
Experts believe that the core data of the anti-scaling method and the evaporator cyclone separation and removal process technology developed by the project are better than the scientific research test indicators of the United States, Japan and other countries, and have high industrial feasibility.
Promotion of the production of calcium chloride from the waste liquid of the ammonia-alkali method
.
? Haihua’s calcium chloride production is based on the ammonia distilled waste liquid produced in the soda ash plant’s ammonia-soda alkali production process as the raw material, and the multi-effect vacuum evaporation device is used as the operating unit.
The production process of flake drying and thickening
.
Because the ammonia distilled waste liquid contains a large amount of sulfate ions, calcium sulfate scales are formed on the inner wall of the evaporator heating tube during the evaporation and concentration process, which seriously reduces the evaporation efficiency, and as the scale layer thickens, the device runs for about 30 days.
It must be stopped for 3~4 days to mechanically clean the heating tube
.
The fouling in the heating chamber has become a "stuck neck" problem that restricts the long-period, efficient and stable operation of the calcium chloride device
.
? Haihua Calcium Chloride Plant has set up a research team for this purpose.
After more than two years of continuous exploration, it has developed a new anti-scaling process for calcium chloride production
.
This innovative process adopts two anti-scaling principles of common ion effect and gypsum seeding method.
Using the principle of common ion effect, part of the concentrated calcium solution is added to the waste liquid to combine the high concentration of calcium ions and sulfate ions to form calcium sulfate precipitation in advance Removal and reduction of scaling on the heat transfer surface of the evaporator; According to the anti-scaling principle of gypsum seeding method, the solid calcium sulfate precipitated during the evaporation process is precipitated and preferentially attached to the suspended calcium sulfate crystals, thereby slowing down the heating tube The deposit on the wall fouls
.
? The new calcium chloride anti-scaling process has three major innovations: one is to determine the optimal feed concentration of the raw material liquid after blending and the optimal ratio of mother liquor to return to blending; the other is to use the product produced in its own production system Calcium sulfate is used as a seed crystal to slow down the deposition of calcium sulfate solids on the wall of the heating tube and delay the fouling speed of the two-effect evaporator; the third is to design and produce a set of calcium chloride that collects the mother liquor to return and mix and settle to prevent scaling The continuous operation device has been applied in industrial production
.
, Ltd.
undertaken by Shandong Haihua Group Calcium Chloride Plant-calcium chloride production anti-scaling technology research passed expert acceptance
.
This subject extended the continuous operation period of the calcium chloride production system from 35 days to 135 days, and the scale thickness of the heating chamber in one operation period was only 0.
49 mm, which reached the leading level in the same industry in China
.
? Industrial application results show that when the feed concentration of the calcium chloride production system is ≧18%, the production system can run continuously for 135 days after the calcium sulfate crystals are returned to the production system, and the scar thickness is up to 0.
49 mm, which is better than the assessment indicators.
The goal of continuous operation for 105 days in one cycle, and the thickness of the heating tube fouling does not exceed 0.
5 mm
.
One ton of calcium chloride saves 178.
5 kilograms of steam, saves 17 kilowatt-hours of electricity, reduces the number of cleanings 6 times a year, and can increase economic benefits by 4.
47 million yuan per year, which has an important demonstration effect on energy saving and consumption reduction
.
Experts believe that the core data of the anti-scaling method and the evaporator cyclone separation and removal process technology developed by the project are better than the scientific research test indicators of the United States, Japan and other countries, and have high industrial feasibility.
Promotion of the production of calcium chloride from the waste liquid of the ammonia-alkali method
.
? Haihua’s calcium chloride production is based on the ammonia distilled waste liquid produced in the soda ash plant’s ammonia-soda alkali production process as the raw material, and the multi-effect vacuum evaporation device is used as the operating unit.
The production process of flake drying and thickening
.
Because the ammonia distilled waste liquid contains a large amount of sulfate ions, calcium sulfate scales are formed on the inner wall of the evaporator heating tube during the evaporation and concentration process, which seriously reduces the evaporation efficiency, and as the scale layer thickens, the device runs for about 30 days.
It must be stopped for 3~4 days to mechanically clean the heating tube
.
The fouling in the heating chamber has become a "stuck neck" problem that restricts the long-period, efficient and stable operation of the calcium chloride device
.
? Haihua Calcium Chloride Plant has set up a research team for this purpose.
After more than two years of continuous exploration, it has developed a new anti-scaling process for calcium chloride production
.
This innovative process adopts two anti-scaling principles of common ion effect and gypsum seeding method.
Using the principle of common ion effect, part of the concentrated calcium solution is added to the waste liquid to combine the high concentration of calcium ions and sulfate ions to form calcium sulfate precipitation in advance Removal and reduction of scaling on the heat transfer surface of the evaporator; According to the anti-scaling principle of gypsum seeding method, the solid calcium sulfate precipitated during the evaporation process is precipitated and preferentially attached to the suspended calcium sulfate crystals, thereby slowing down the heating tube The deposit on the wall fouls
.
? The new calcium chloride anti-scaling process has three major innovations: one is to determine the optimal feed concentration of the raw material liquid after blending and the optimal ratio of mother liquor to return to blending; the other is to use the product produced in its own production system Calcium sulfate is used as a seed crystal to slow down the deposition of calcium sulfate solids on the wall of the heating tube and delay the fouling speed of the two-effect evaporator; the third is to design and produce a set of calcium chloride that collects the mother liquor to return and mix and settle to prevent scaling The continuous operation device has been applied in industrial production
.
