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Zero-release coupling humidifying dust-removing synergizing system and method for desulfurization wastewater

A technology for desulfurization wastewater and zero discharge, applied in chemical instruments and methods, gaseous effluent wastewater treatment, electrostatic effect separation, etc., can solve problems such as high operating costs, incomplete evaporation, dust accumulation and corrosion, and achieve investment and operation Low cost, lower fly ash specific resistance, water and energy saving effects

Pending Publication Date: 2017-05-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The desulfurization wastewater is used in the wet slag removal system after conventional treatment or without treatment. Because the desulfurization wastewater is acidic and contains high chloride ions, it will affect the comprehensive utilization of ash and slag and is extremely corrosive to metals. In addition, the slag washing water needs Secondary treatment, it is difficult to achieve true zero discharge of wastewater
[0009] Chinese patent CN 204185326U provides a zero-discharge treatment system for desulfurization wastewater, including wastewater pretreatment equipment, evaporation concentration equipment, and evaporation crystallization equipment. Through the treatment of the equipment, the final products are distilled water and crystallized salt, reducing the discharge of harmful substances. However, the evaporation and crystallization technology has requirements on the purity of the crystallized salt, and advanced pretreatment of desulfurization wastewater is required. The subsequent membrane concentration and evaporation crystallization conditions need to remove turbidity, scaling substances, and chemical oxygen demand (COD). In the concentration stage, it is easy to scale, which affects the operation and service life of the equipment. The concentration of magnesium ions in the desulfurization wastewater is high, and the softened product magnesium hydroxide is a flocculent colloid, which is difficult to precipitate and difficult to filter and separate, which brings difficulties to the process operation. , at the same time, the operating cost is relatively high, and the operating cost of evaporation and crystallization accounts for about 45% of the total operating cost
The system must discharge a small part of brine or sludge, and the product crystal salt obtained in wastewater treatment is difficult to be used commercially or needs to be treated as solid waste
[0010] Chinese patent CN 204097264U provides a zero-discharge device for desulfurization wastewater, which consists of a desulfurization system, a two-stage wastewater cyclone, an ultrasonic atomizing nozzle, a dust collector, a wastewater pump, and a wastewater delivery pump. There is no external discharge of waste water, and the inorganic salt ions and heavy metal ions in the waste water are efficiently removed, but the load is greatly affected, and the treatment capacity is insufficient; the flue gas temperature after the air preheater is low, and it may cause damage to the dust removal system with low and low temperature electric dust removal The length of the flue is shortened, and the evaporation is not complete, resulting in dust accumulation and corrosion

Method used

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Examples

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Effect test

Embodiment 1

[0037] refer to figure 1 , figure 2, a zero-discharge desulfurization wastewater coupling humidity control and dust removal efficiency enhancement system, including a desulfurization tower 2 connected in sequence, a gypsum dehydration system 3, a waste water cyclone 4, a waste water tank 8, a rotary spray evaporation tower 11 and a dust collector 1. The waste water cyclone includes a swirl sub-body 23 and an overflow pipe 24. The swirl sub-body is provided with a cyclone inlet 25 and a bottom flow port 7, and the bottom flow port 7 is located at the bottom of the swirl sub-body. The inlet 25 of the cyclone is connected to the gypsum dehydration system 3, the bottom outlet 7 of the cyclone is connected to the desulfurization tower 2, the overflow pipe 24 is arranged on the cyclone body, and the overflow pipe has an overflow port 6 , the overflow port 6 is connected to the waste water tank 8, the overflow port 6 is arranged on the upper part of the cyclone sub-body, and the cy...

Embodiment 2

[0041] refer to figure 1 , figure 2 , a desulfurization wastewater zero discharge coupled humidity control and dust removal method, using the system described in Example 1, comprising the following steps:

[0042] (1) After the gypsum slurry in the desulfurization tower 2 is treated by the gypsum dehydration system 3, it is transported to the waste water cyclone 4 through the first waste water delivery pump 5;

[0043] (2) After the waste water is treated by the waste water cyclone 4, it is discharged to the desulfurization tower 2 through the bottom flow port 7 of the waste water cyclone for recycling. The overflow of the cyclone is transported to the waste water tank 8 through the waste water overflow port 6 for collection. The high-level lye tank 9 self-flows to the waste water tank 8, adjusts the pH of the waste water, realizes that the pH of the waste water is greater than 7 and at the same time realizes the softening of the waste water, and the waste water after soften...

Embodiment 3

[0050] refer to figure 1 , figure 2 , for a combined heat and power unit with a boiler capacity of 260t / h, the flue gas volume is about 300,000 Nm 3 / h, the smoke temperature of the flue gas in front of the air preheater 27 is about 350°C, and the flue gas temperature behind the air preheater 27 is about 130°C under the rated load of the boiler. Process + limestone-gypsum wet flue gas desulfurization and dust removal process), the temperature of the wastewater after the gypsum slurry in the desulfurization tower 2 is treated by the gypsum dehydration system 3 is 40°C, and it is transported to the wastewater cyclone 4 through the first wastewater delivery pump 5; The overflow port 6 is transported to the waste water tank 8 for collection, adding a calcium hydroxide solution with a mass fraction of 10% to adjust the pH of the waste water to 9, and the waste water after the pH adjustment is transported to the rotating mist in the rotary spray evaporation tower system through th...

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Abstract

The invention relates to a zero-release coupling humidifying dust-removing synergizing system and a zero-release coupling humidifying dust-removing synergizing method for desulfurization wastewater. The zero-release coupling humidifying dust-removing synergizing system comprises a desulfurizing tower, a gypsum dewatering system, a wastewater cyclone, a wastewater box, a rotary spraying and evaporating tower and a dust remover, wherein wastewater treated through the gypsum dewatering system is treated through the wastewater cyclone; afterwards, one part underflows to the desulfurizing tower to be repeatedly utilized; one part overflows to a wastewater box to be collected; the wastewater is conveyed to a rotary sprayer to be atomized; an atomized fog drop descends, is regressively in contact with a high-temperature fume which is introduced from the front of an air pre-heater; a solid particle in the evaporated wastewater and the fume integrally descend to the lower part of a rotary evaporating tower, and enter a front flue of the dust remover through an outlet flue of the rotary evaporating tower; the wastewater passes through the dust remover in a form of purified water vapor to enter the desulfurizing tower. The zero-release coupling humidifying dust-removing synergizing system and the zero-release coupling humidifying dust-removing synergizing method are high in wastewater treatment stability, and are not influenced by the load of a unit; the investment and running expenses are low; the water consumption and the energy consumption are reduced; the fume humidity is increased while the zero release of the wastewater is realized; the dust removal efficiency of the dust remover is improved.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater control, and in particular relates to a desulfurization wastewater zero-discharge coupling humidity adjustment and dust removal efficiency enhancement system and method. Background technique [0002] The desulfurization wastewater is acidic with a pH between 4 and 6, and the salt content is high. For aluminum hydroxide, the hardness of the wastewater is relatively high between 5116 and 11545 mg / L. The cations in the wastewater are mainly hardness ions such as calcium and magnesium. There are many types of heavy metal ions, and the content is much higher than the discharge standard. Chloride ions are likely to cause corrosion of subsequent equipment. [0003] The "Technical Regulations for Wastewater Treatment Design of Thermal Power Plants" promulgated in 2006 has clearly stated that the desulfurization wastewater treatment facilities of thermal power plants should be set up se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B03C3/00C02F103/18
CPCC02F9/00B03C3/00C02F1/66C02F1/048C02F1/38C02F2103/18
Inventor 高翔郑成航周灿骆仲泱倪明江岑可法竺新波张涌新翁卫国吴卫红王丁振曲瑞阳李响
Owner ZHEJIANG UNIV
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