A desulfurization wastewater evaporation process and system

A desulfurization wastewater and evaporation system technology, applied in the field of desulfurization wastewater evaporation process and system, can solve the problems of high hardness of calcium and magnesium in desulfurization wastewater, difficulty in softening process control, high cost of softening chemicals, etc., to reduce total steam consumption and scaling risk Small, scale-reducing effects

Active Publication Date: 2016-08-24
GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advantages: After the wastewater is softened, the scaling problem in the evaporation process is well solved, and the purity of the crystallized salt produced is relatively high; Disadvantages: the hardness of calcium and magnesium in desulfurization wastewater is high, the cost of softening agents is very high, and the added agents produce a large amount of waste residue , the softening process is difficult to control, and the effluent fluctuates greatly

Method used

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  • A desulfurization wastewater evaporation process and system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] refer to figure 1 , the desulfurization wastewater evaporation system described in this embodiment includes a water-to-water heat exchanger 1, a primary heating evaporation device, a primary heating evaporation device, a secondary heating evaporation device, a tertiary heating evaporation device, a crystallization processor 6, and a cooler 7 and vacuum pump 8;

[0045] The primary heating evaporation device includes a primary heater 21, a primary flash tank 22 and a primary circulating pump 23 arranged between them;

[0046] The primary heating evaporation device comprises a primary heater 31, a primary flash tank 32 and a primary circulating pump 33 arranged between them; between the primary heater 31 and the primary flash tank 32, steam compressor 34;

[0047] The secondary heating evaporation device comprises a secondary heater 41, a secondary flash tank 42 and a secondary circulation pump 43 arranged between them;

[0048] The tertiary heating evaporation device ...

Embodiment 2

[0064] The characteristics of this embodiment are: the desulfurization wastewater evaporation system is the same as that of Embodiment 1, the difference is that the control parameters in the desulfurization wastewater evaporation process are different, as follows:

[0065] 1) Preheat the wastewater temperature to 80°C.

[0066] 2) Control the temperature of the primary flash tank at 98°C and the vacuum pressure at 0.094Mpa;

[0067] 3) Control the temperature of the primary flash tank at 100°C.

[0068] 4) Control the temperature of the secondary flash tank at 102°C.

[0069] 5) Control the temperature of the three-stage flash tank at 112°C.

[0070] 6) Control the temperature of the crystallization evaporator at 70°C.

[0071] Others are the same as in Example 1.

Embodiment 3

[0073] The characteristics of this embodiment are: the desulfurization wastewater evaporation system is the same as that of Embodiment 1, the difference is that the control parameters in the desulfurization wastewater evaporation process are different, as follows:

[0074] 1) Preheat the wastewater temperature to 85°C.

[0075] 2) Control the temperature of the primary flash tank at 100°C and the vacuum pressure at 0.1013Mpa;

[0076] 3) Control the temperature of the primary flash tank at 102°C.

[0077] 4) Control the temperature of the secondary flash tank at 104°C.

[0078] 5) Control the temperature of the three-stage flash tank at 114°C.

[0079] 6) Control the temperature of the crystallization evaporator at 75°C.

[0080] Others are the same as in Example 1.

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Abstract

The invention discloses desulfurization wastewater evaporation technology and system. According to the desulfurization wastewater evaporation system disclosed by the invention, a thick liquid inlet of a water-water heat exchanger is connected with a wastewater conveying pipe by virtue of a pipeline, and a thick liquid outlet is connected with a thick liquid inlet of a crystal processor by virtue of a primary heating and evaporation device, a first-level heating and evaporation device, a second-level heating and evaporation device and a three-level heating and evaporation device sequentially; one of three-level secondary steam outlets of a three-level flash drum is connected with a steam source inlet of a three-level heater, and another three-level secondary steam outlet of a three-level flash drum is connected with a steam source inlet of a second-level heater; second-level secondary steam outlets of a second-level flash drum are connected with a steam source inlet of a primary heater; the primary secondary steam outlet of a primary flash drum is connected with a steam source inlet of a condenser, and an air exhaust of the condenser is connected with a vacuum pump. The desulfurization wastewater evaporation technology and system are capable of effectively preventing the problem of scaling in the desulfurization wastewater evaporation process, also effectively lowering energy consumption and improving the evaporation efficiency.

Description

technical field [0001] The invention relates to an evaporation process and system, in particular to a desulfurization wastewater evaporation process and system. Background technique [0002] Desulfurization wastewater treatment is the last difficulty in the environmental protection of coal-fired boilers. With the improvement of environmental protection requirements, wastewater can no longer be discharged at will and needs to be recycled. The characteristics of desulfurization wastewater are: high salt content, complex composition and strong scaling, which cannot be recovered by conventional processes at present, and evaporation has become the most important means of desulfurization wastewater treatment; due to the characteristics of desulfurization wastewater, the scaling of evaporation equipment will be very serious , affecting the long-term stable operation of the evaporation system. [0003] The traditional process to prevent scaling is: dosing chemical softening + thin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/18
CPCC02F1/041C02F1/06C02F9/00C02F2103/18
Inventor 黄皆斌龙国庆陈卓彬胡淼
Owner GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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