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Novel wet flue gas desulfurization wastewater treatment method and system

A wet flue gas desulfurization and wastewater treatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of high cost can reduce operation and maintenance costs and equipment investment, reduce a large amount of sludge discharge, and reduce the amount of system operation.

Active Publication Date: 2013-10-16
DATANG ENVIRONMENT IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] (2) The main factor of desulfurization wastewater production is the absorption tower slurry Cl - The control concentration, the concentration control is too high (Wu Yiwei. The limestone-gypsum wet flue gas desulfurization wastewater treatment research, Beijing, China Electric Power, 2006 (4) Wu Yiwei. The limestone-gypsum wet flue gas desulfurization wastewater treatment research, Beijing, China electric power, 2006(4)), the quality of gypsum slurry decreased, resulting in a decrease in desulfurization efficiency, and at the same time, the anti-corrosion requirements of equipment were increased; if the concentration control was too low, the discharge of desulfurization wastewater increased significantly, and the cost of wastewater treatment increased
[0021] (1) The solid content of the waste water source is high, which can easily lead to the accumulation and blockage of the waste water triple tank, affecting the normal operation of the system
[0022] (2) The frame plate filter press has a large amount of operation and a high failure rate
[0023] (3) High operating costs

Method used

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  • Novel wet flue gas desulfurization wastewater treatment method and system
  • Novel wet flue gas desulfurization wastewater treatment method and system
  • Novel wet flue gas desulfurization wastewater treatment method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Such as image 3 As shown, this embodiment provides a 2×600MW coal-fired generating unit wet desulfurization wastewater treatment system, the overflow of the gypsum cyclone returns to the recovery pool, and the underflow of the gypsum cyclone is concentrated gypsum slurry, which is transported to the vacuum belt The dehydrator and the gas-liquid separation tank are the main suction equipment of the vacuum belt dehydrator, which are used to suck the water in the gypsum slurry through the filter cloth. The sucked desulfurization wastewater enters the gas-liquid separation tank of the vacuum belt conveyor. The desulfurization wastewater from the bottom flow of the gas-liquid separation tank, such as Figure 6 and Figure 7 As shown, its solid content rate is about 0.05%, which is greatly reduced compared with the solid content rate of 1% in the desulfurization wastewater separated by the wastewater cyclone of the traditional treatment system.

[0059] The maximum waste ...

Embodiment 2

[0066] Such as Figure 4 As shown, this embodiment provides a 2×600MW coal-fired generating set wet desulfurization wastewater treatment system. On the basis of Embodiment 1, a waste water triple tank is added. The waste water triple tank includes a neutralization tank, a reaction tank and Flocculation box. Desulfurization wastewater can be settled in three stages in the wastewater triple tank to further reduce the solid content. In addition, there is another benefit: some enterprises have very strict requirements on wastewater, or the factory cannot be recycled and needs to be discharged. At this time The waste water triple box can add a dosing device at any time, which improves the flexibility of the system.

[0067] The system of this embodiment also adds a waste water triple tank bypass, and the connection and closure of the waste water triple tank bypass is controlled by a valve. This ensures the flexibility and reliability of the system, and ensures the long-term, stab...

Embodiment 3

[0069] Such as Figure 5 As shown, this embodiment provides a 2×600MW coal-fired generating set wet desulfurization wastewater treatment system. On the basis of Embodiment 2, the dosing device of the wastewater triple tank, the clarifier tank and the clean water tank is added, and as the sewage Frame plate filter press for mud pressing equipment.

[0070] After the desulfurization wastewater enters the neutralization tank, the pH value is 5.0-6.0. In order to remove heavy metals in the desulfurization wastewater, NaOH or Ca(OH)2 is added to increase the pH value to 9.0±0.5. At this time, Cu, Cr, Pb and other heavy metals are The hydroxide form is basically precipitated, and the remaining heavy metals are captured by organic sulfur in the reaction box to form a fine suspension. The suspended solids are interconnected and enlarged under the contact and wrapping of the flocculant, and continue to grow through the action of the polyacrylamide (PAM) coagulant. After entering the c...

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Abstract

The invention provides a novel wet flue gas desulfurization wastewater treatment method. Desulfurization wastewater is taken from an underflow of a gas-liquid separation tank of a vacuum belt water extractor, so that the solid content of the desulfuration wastewater is reduced greatly, and the large-amount sludge discharge is reduced. The solid content of the desulfuration wastewater after natural settling is further reduced, so that the desulfuration wastewater can meet an in-plant recycling condition. A wastewater trigeminy box, a wastewater dosing system, a wastewater cyclone and sludge pressing equipment can be canceled, so that the running maintenance cost and equipment investment are lowered, and a system operation load is reduced. In addition, in order to meet different requirements, the dosing system of the wastewater trigeminy box and the sludge pressing equipment can be reserved selectively, in this way, the pH value of the desulfuration wastewater can be adjusted, heavy metal in the desulfuration wastewater can be removed, and the treated desulfuration wastewater can reach a national discharge standard. The flexibility and the reliability of a system can be improved by additionally adopting a by-pass of the wastewater trigeminy box, and long-term and stable running of the system is guaranteed. In addition, the invention further provides the system capable of achieving the method.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to the field of wet flue gas desulfurization wastewater treatment, in particular to a novel wet flue gas desulfurization wastewater treatment method and system. Background technique [0002] Among the current various flue gas desulfurization processes, the limestone-gypsum wet flue gas desulfurization process has the advantages of mature technology, wide range of coal types, and high desulfurization efficiency, and its share in practical engineering applications has reached more than 85%. Because this desulfurization process inevitably produces desulfurization wastewater, the nature of the wastewater is quite different from that of traditional wastewater, and it is difficult to process it synchronously. Enterprises have to invest a lot of money to set up an independent desulfurization wastewater treatment system. However, due to the high solid content of desulfurization waste...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/02
Inventor 李启全
Owner DATANG ENVIRONMENT IND GRP
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