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A method for treating circulating cooling water

A technology of circulating cooling water and treatment cycle, which is applied in natural water treatment, multi-stage water treatment, non-polluted water treatment, etc. It can solve the problems of high concentration and uneconomical dosage of chemicals, and achieve low dosage of chemicals and easy Control and improve the effect of scaling and corrosion

Active Publication Date: 2021-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the low-temperature scaling problem, this document compounded a new type of agent on the basis of the commonly used corrosion and scale inhibition formula, but the concentration of the agent was large (40-80mg / L), which was uneconomical.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] The second agent can be the same or different from the first agent, and can be used in the art (i.e., a pharmaceutical agent mainly having corrosion inhibition performance), however, in order to achieve better scale inhibition resistance and further reduce the drug According to a preferred embodiment of the present invention, the second agent comprises (to) phosphate and / or polyphosphate, the second agent in PO 4 3- The investment volume is 2-4 mg / L (more preferably 2.2 to 3.8 mg / L).

[0023] The phosphate can be a variety of water-soluble phosphates commonly used in the art, as long as it is added to the water, PO can be produced. 4 3- I.e. More preferably, the phosphate is selected from the group consisting of sodium phosphate, potassium phosphate, sodium hydrogen phosphate, potassium hydrogen phosphate, phosphate, and one or more of potassium dihydrogen phosphate.

[0024] The polyprophosphate can be a water-soluble polyspiosphate and / or a water-soluble polyvas...

Embodiment 1

[0049] Take the test raw water, zinc sulfate, HEDP and acrylic acid / 2-methyl-2'-acrylamide propane sulfonic acid copolymer, so that Zn in water 2+ The concentration of Hedp and acrylic / 2-methyl-2'-acrylamide propylenesulfonic acid copolymer is 0.45 mg / L, 0.8 mg / L, 1.6mg / L, and then 20 # The carbon steel test piece is suspended in the water, followed by in the water. 2 2h, pass N 2 After the end, the sampling should be calcium calcium concentration (recorded as CA 1 ), Followed by N 2 The post-test water is placed in a thermostat of 5 ° C, and the calcium calcium ion concentration is taken after 18h (remember to CA) 2 ), At the same time # Corrosion rate of carbon steel test (Remembling F 1 );

[0050] Sodium phosphate is added to water 1-1 in the test, so that in water PO 4 3- The concentration was (2.2 / 5) mg / L, then concentrated in a water bath in an 80 ° C to concentrate, and the calcium ion concentration in the water after cooling (recorded as CA) 3 );

[0051] T...

Embodiment 2

[0053] Take the test raw water 1, zinc sulfate and zinc chloride, PBTCA, acrylic / 2-methyl-2'-acrylamide propane sulfonic acid copolymer, to make the water Zn 2+ , PBTCA, acrylic / 2-methyl-2'-acrylamide propylenesulfonic acid copolymer concentration is 0.65 mg / L, 1.2mg / L, 1.8mg / L, and then 20 # The carbon steel test piece is suspended in the water, followed by in the water. 2 2h, pass N 2 After the end, the sampling should be calcium calcium concentration (recorded as CA 1 ), Followed by N 2 The post-test water is placed in a thermostat of 5 ° C, and the calcium calcium ion concentration is taken after 18h (remember to CA) 2 ), At the same time # Corrosion rate of carbon steel test (Remembling F 1 );

[0054] Add sodium hexamphosphate in the test water 1-1, so that the water is po 4 3- The concentration was (3.8 / 5) mg / L, then concentrated in a water bath in an 80 ° C to concentrate, and the calcium ion concentration in the water was then subjected to the water. 3 );

...

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Abstract

The invention relates to the field of circulating cooling water treatment, and discloses a method for treating circulating cooling water. The method includes: adopting fresh water as cooling water of the air pre-cooling system, and adding the first agent to the air pre-cooling system; using the outlet water of the air pre-cooling system as replenishing water of the circulating cooling water system, and feeding The second agent is added to the supplementary water of the system; the sum of the calcium ion concentration and the total alkalinity of the fresh water is not more than 100 mg / L; the first agent includes acrylic acid and 2-methyl-2'-acrylamidopropane Copolymers of sulfonic acids, zinc salts and organic phosphonic acids. The invention solves the scaling and corrosion problems of the air precooling system and the circulating cooling water system by changing the replenishment point of fresh water and the reasonable addition of scale and corrosion inhibitors. Save production costs.

Description

Technical field [0001] The present invention relates to the field of circulating cooling water treatment, and in particular, to a process for treating circulating cooling water. Background technique [0002] In the petrochemical industry, it is often used to cool the process medium, and the cooling water system has direct current cooling water system and circulating cooling water system. The cooling water of the DC cooling water system is only turned off once, and the water consumption is large. And the circulating cooling water system can realize the recycling of cooling water, which greatly saves the amount of fresh water and is therefore widely adopted. Nowadays, there is now many open cycle cooling water systems, and after cooling water and heat medium heat exchange, the temperature is lowered and the temperature after heat exchange is lowered, and then returned to the process system to change heat, so reciprocated In the process of cooling water and air heat exchange, a part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C02F103/02
CPCC02F5/145C02F2103/023C02F2301/08
Inventor 楼琼慧郦和生秦会敏谢文州吴颖王洪英张春原
Owner CHINA PETROLEUM & CHEM CORP
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