Salt inhibitor for process for spraying salt-containing wastewater back to quench tower

A technology for salty wastewater and quench towers, which is applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve potential safety hazards, health impacts on operators, and harsh operating environments for salt accumulation cleaning and other problems to achieve the effect of reducing the difficulty of cleaning

Active Publication Date: 2020-12-15
NANJING OMNIPOTENT ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the brine quenching tower process faces a huge problem in the operation process: when the salty wastewater is sprayed back into the quenching tower, the waste salt not only precipitates at the bottom of the quenching tower, but also precipitates on the inner wall of the quenching tower
On the one hand, the generation of salt accumulation seriously affects the normal operation of the device, on the other hand, the operating environment of salt accumulation cleaning is harsh, which brings huge health impact and safety hazards to operators

Method used

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  • Salt inhibitor for process for spraying salt-containing wastewater back to quench tower
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  • Salt inhibitor for process for spraying salt-containing wastewater back to quench tower

Examples

Experimental program
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Effect test

Embodiment 1

[0046] At the site of a hazardous waste incineration enterprise in Jiangsu, a single rotary kiln incinerator incinerates 70 tons of industrial solid waste and industrial hazardous waste every day, and produces about 75 tons of waste water with a salt content of 3-8wt% per day. Before adding the salt inhibitor, the salty wastewater is sprayed back to the quench tower, and the slag outlet of the quench tower drops less fly ash, about 2 tons per day; the salt accumulation in the tower is serious, every 20 days, the flue gas of the quench tower More than half of the channel was blocked, and the negative pressure could not pull it, so the car had to be stopped for manual cleaning; during the cleaning process, it was found that the accumulated salt was very hard, like a rock (such as figure 1 shown). It is necessary to use a pneumatic pick to slowly clean up the salt accumulation on the tower wall, and the cleaning cycle is as long as 5 days to 7 days.

[0047] Dissolve potassium f...

Embodiment 2

[0051] In the same part of the same system at the user site in Example 1, add a salt inhibitor composed of potassium ferrocyanide and polyacrylic acid (the number average molecular weight is about 1060, and the molecular weight distribution index is 2.13), according to the mass ratio of 1:10. (At the same time, add ascorbic acid or erythorbic acid in an equal proportion to potassium ferrocyanide as an antioxidant to ensure the stability of potassium ferrocyanide). Dissolve polyacrylic acid and ascorbic acid in deionized water and mix until completely dissolved, adjust the pH value to about 10 with alkali, then add potassium ferrocyanide, mix evenly until completely dissolved, and prepare an aqueous solution of salt inhibitor, among which, ferrous The concentration of potassium cyanide is about 2wt%, and the concentration of polyacrylic acid is about 20wt%. Add the aqueous solution of salt inhibitor to the brine pipeline before entering the quenching water tank, install a pipel...

Embodiment 3

[0055] In another industrial hazardous waste incineration site in Jiangsu, the third phase of a single rotary kiln has a daily incineration capacity of 50 tons, and produces about 45-60 tons of saline wastewater with a salt content of about 8wt% every day. The brine has been sprayed back to quench tower. Before the salt inhibitor was added, the negative pressure of the quench tower could not be pulled every 7 days, and it was necessary to keep warm and clean without stopping for 24 hours. The production load was seriously insufficient; Figure 5 shown). The work intensity is high, the cleaning area is not enough, there is a lot of residual salt accumulation, and the water dripping under the quench tower is serious.

[0056] On the brine pipeline before the quenching water tank, a pipeline mixer is installed, and at the dosing port of the pipeline mixer, add potassium ferrocyanide and hydrolyzed polymaleic anhydride (number average molecular weight is about 410, molecular weig...

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Abstract

The invention discloses a salt inhibitor for a for process for spraying salt-containing wastewater back to quench tower. The effective components of the salt inhibitor comprise water-soluble ferrocyanide salt, preferably any one or a mixture of more than two of potassium ferrocyanide, sodium ferrocyanide, calcium ferrocyanide or ammonium ferrocyanide. The water-soluble ferrocyanide salt is added into salt-containing wastewater before the salt-containing wastewater is sprayed back into the quench tower, is mixed with the salt-containing wastewater and then is sprayed into the quench tower jointly, so that salt deposition of the quench tower can be effectively prevented. The principle is to change the interface state and growth orderliness of microcrystals, meanwhile, the water-soluble ferrocyanide salt is adsorbed on the crystallization surface of waste salt; and the binding force between the salt particles is reduced, so that the effect of preventing salt deposition is achieved. Finally, salt separated from the salt-containing wastewater is not caked in the quench tower, but is powdery, and falls into an ash outlet along with ash of flue gas. Accidental shutdown caused by blockageof the quench tower due to the fact that waste salt microcrystals are mutually gathered to form hard salt blocks which are deposited on the inner wall of the quench tower to form a salt deposition layer is avoided.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment, and relates to the utilization of saline wastewater in the hazardous waste treatment process, in particular to a salt inhibitor used in the saline wastewater back-spraying quenching tower process. Background technique [0002] The high-temperature exhaust gas produced by hazardous waste incineration treatment equipment needs to be cooled rapidly and then enter the flue gas scrubber to remove acid gases and other harmful components in the exhaust gas. This rapid cooling process is usually completed in the quench tower. Due to the requirements of environmental protection, the current hazardous waste incineration treatment device generally uses the salty wastewater from the flue gas scrubber to be sprayed back into the quenching tower to realize the quenching of high-temperature exhaust gas, and at the same time, the salt in the wastewater is precipitated at the bottom of the quenching tower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12F23J15/06
CPCC02F5/12F23J15/06
Inventor 陈峻
Owner NANJING OMNIPOTENT ENERGY SAVING TECH CO LTD
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