A kind of salt inhibitor for back-spraying quench tower process of salty wastewater

A technology for salt-containing wastewater and quenching towers, applied in the field of salt blocking agents, can solve problems such as hidden safety hazards, health effects of operators, and effects on the normal operation of devices, and achieve the effect of reducing the difficulty of cleaning

Active Publication Date: 2022-07-01
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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  • A kind of salt inhibitor for back-spraying quench tower process of salty wastewater
  • A kind of salt inhibitor for back-spraying quench tower process of salty wastewater
  • A kind of salt inhibitor for back-spraying quench tower process of salty wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] At the site of a hazardous waste incineration enterprise in Jiangsu, a single rotary kiln incinerator burns 70 tons of industrial solid waste and industrial hazardous waste every day, and produces about 75 tons of wastewater with a salt content of 3-8wt% per day. Before the salt inhibitor is added, the salty wastewater is sprayed back into the quench tower, and the slag port of the quench tower falls, and the falling fly ash is about 2 tons per day; the salt accumulation in the tower is serious, every 20 days or so, the flue gas of the quench tower More than half of the channel is blocked, and the negative pressure cannot be pulled, so it must be stopped for manual cleaning; during the cleaning process, it is found that the accumulated salt is very hard, like a rock (such as figure 1 shown). It is necessary to use an air pick to slowly remove the salt accumulated on the tower wall, and the cleaning cycle can be as long as 5 to 7 days.

[0047] Dissolve potassium ferroc...

Embodiment 2

[0051] In the same part of the same system at the user site of Example 1, add a salt blocking agent composed of potassium ferrocyanide and polyacrylic acid (number average molecular weight is about 1060, molecular weight distribution index 2.13), according to the mass ratio of 1:10 (At the same time, ascorbic acid or erythorbic acid in the same proportion as potassium ferrocyanide is added 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 potassium cyanide concentration is about 2 wt %, and the polyacrylic acid concentration is about 20 wt %. Add the aqueous solution of salt blocking agent to the brine pipeline before entering the quench water tank, install a pipeline mi...

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. tower. Before the salt inhibitor was added, the negative pressure of the quenching tower could not be pulled every 7 days of operation, and it was necessary to keep the cooling tower clean for 24 hours without stopping, and the production load was seriously insufficient. Figure 5 shown). The work intensity is large, the cleaning area is not enough, the residual salt is very large, and the water dripping under the quenching tower is serious.

[0056] Install a pipeline mixer on the brine pipeline before the quench water tank, and add potassium ferrocyanide and hydrolyzed polymaleic anhydride (number average molecular weight about 410, molecular weight distribution index 1.21), A salt inhibitor composed of a mass ratio of 1...

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Abstract

The invention discloses a salt inhibitor for the back-spraying quench tower process of salt-containing waste water. Its effective components include water-soluble ferrocyanide salts, preferably potassium ferrocyanide, sodium ferrocyanide, Any one or a mixture of two or more of calcium oxide or ammonium ferrocyanide. The water-soluble ferrocyanide salt is added to the salt-containing wastewater before the salt-containing wastewater is sprayed back into the quenching tower, and then mixed with the salt-containing wastewater and sprayed into the quenching tower, which can effectively prevent the salt deposition in the quenching tower. The principle is: Change the interface state and growth order of crystallites, and at the same time adsorb on the surface of waste salt crystals, reduce the binding force between salt particles and salt particles, so as to achieve the effect of preventing salt deposition. In the end, the salt precipitated from the salty wastewater will not form a plate in the quenching tower, but will be in the form of powder, which will fall into the ash outlet along with the ash in the flue gas. Avoid the accumulation of waste salt crystallites to form hard salt blocks, which will be deposited on the inner wall of the quenching tower to form a salt layer, which will block the parking accident caused by the quenching tower.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and relates to the utilization of salt-containing waste water in the hazardous waste treatment process, in particular to a salt inhibitor used for the back-spraying quench tower process of salt-containing waste water. Background technique [0002] The high-temperature exhaust gas generated by the hazardous waste incineration treatment device needs to be cooled rapidly and then enters the flue gas scrubber to remove acid gas and other harmful components in the exhaust gas. This rapid cooling process is usually completed in the quench tower. Due to the requirements of green environmental protection, the current hazardous waste incineration treatment devices generally use the salt-containing wastewater from the flue gas scrubbing tower to be sprayed back into the quenching tower to achieve quenching of the high-temperature exhaust gas. At the same time, the salt in the wastewater is precipitat...

Claims

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Application Information

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Patent Type & Authority Patents(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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