CN104549761A - Cyclic utilization system of washing water of wet electric dust collector - Google Patents

Cyclic utilization system of washing water of wet electric dust collector Download PDF

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Publication number
CN104549761A
CN104549761A CN201410813131.1A CN201410813131A CN104549761A CN 104549761 A CN104549761 A CN 104549761A CN 201410813131 A CN201410813131 A CN 201410813131A CN 104549761 A CN104549761 A CN 104549761A
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China
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wet
water
communicated
water tank
flushing
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CN201410813131.1A
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Chinese (zh)
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CN104549761B (en
Inventor
罗钟高
田家平
光旭
沈又幸
李琪
袁勤勇
张卫灵
程慧
卞卡
张加权
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浙江省电力设计院
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Abstract

The invention discloses a cyclic utilization system of washing water of a wet electric dust collector. The cyclic utilization system is mainly characterized in that a wet electric dust collector is additionally arranged behind a wet desulfurization system; a dust hopper used for collecting washing wastewater which flows down from a collector of the wet electric dust collector is arranged on the lower surface of the wet electric dust collector; the dust hopper is communicated with a wastewater tank through a connection pipe; the side wall of the upper layer of the wastewater tank is communicated with a circulating water tank with an alkalifying treatment device through a communication pipe; the circulating water tank is communicated with a circulating water system of the wet electric dust collector through a washing water circulating pump; the bottom of the wastewater tank is externally connected through a wastewater pipe and directly communicated to the wet desulfurization system and/or is processed and subsequently communicated with the wet desulfurization system. The cyclic utilization system can be used for recycling and reusing the washing water; the consumption of water supply of the wet desulfurization system process is reduced; the purposes of saving water and reducing emission are achieved.

Description

A kind of wet-esp flushing water cyclic utilization system
Technical field
The present invention relates to a kind of wet-esp flushing water cyclic utilization system, belong to thermal power plant design field.
Background technology
Big-and-middle-sized thermal power plant extensively adopts selective-catalytic-reduction denitrified, electrostatic precipitation and Limestone-gypsum Wet Flue Gas Desulfurization Process to carry out purified treatment to flue gas, in order to meet the requirement of up-to-date thermal power plant's air pollution emission standard (GB 1323-2011), wet electrical dust precipitator is set up after wet desulfurization system, stably can not only remove the gypsum slurries that the fine particle in flue gas, the microlayer model of oxysulfide and flue gas carry, and the gypsum rain phenomenon that the wet desulfurization system effectively can eliminating smokeless heat exchanger may be formed.The operation of wet electrical dust precipitator and wet desulfurization system all needs to consume a large amount of water, and for 1000MW unit, the moisturizing of Limestone-gypsum Wet Flue Gas Desulfurization Process system process water is about 100t/h, and the technique rate of water make-up of wet-esp also reaches 40t/h.The wet desulphurization of conventional design and the water system of wet-esp often separate, the cyclic utilization rate of water is lower, and especially the flushing waste water treatment and use rate of wet-esp is low, causes great water resource waste, has raised pollutant catabolic gene cost.
Summary of the invention
The object of the invention is to make up the lower deficiency of wet-esp flushing water cyclic utilization rate, and a kind of wet-esp flushing water cyclic utilization system is proposed, it can realize wet-esp flushing water efficient circulation and utilize, and has greatly saved and has used water in the flue gas pollutant control procedure of thermal power plant.
The object of the invention is to have been come by following design: it mainly comprises: after wet desulfurization system, have additional wet electrical dust precipitator, be provided with for collecting the ash bucket flowing down flushing waste water from wet electrical dust precipitator colelctor electrode below described wet electrical dust precipitator, described ash bucket is communicated with waste water tank by adapter, by being communicated with one communicating pipe with the cyclic water tank adding and subtracting treating apparatus on the upper strata sidewall of waste water tank, described cyclic water tank is communicated with in the circulation of wet electrical dust precipitator by a flushing water circulating pump;
The bottom of described waste water tank is picked out by waste pipe, and directly or/and be communicated with wet desulphurisation system after treatment.
Waste water divides two-way to pick out by the waste pipe that the bottom of described waste water tank picks out, one tunnel is directly communicated with wet desulphurisation system, another road connects the prelimer that can carry out Separation of Solid and Liquid, this prelimer is connected with one and primary water is sent into demister cleaning water tank, and be communicated with wet desulphurisation system by a demister flushing water pump; The sludge pump that bottom concentrate can be entered Waste Water Treatment is connected to by adapter bottom described prelimer.
Described wet desulfurization system and wet electrical dust precipitator are also connected to a road technique moisturizing, and described technique moisturizing is divided into again three branch road moisturizings; Wherein a branch road moisturizing is directly communicated with wet electrical dust precipitator, and another branch road is communicated with wet desulphurisation system after connecting sulfur removal technology water tank; A branch road is also had to be connected to mist eliminator flushing water tank.
Described plus-minus treating apparatus comprises a lye tank, and this lye tank adds alkali pump by one and is communicated with cyclic water tank; Adapter after described flushing water circulating pump is provided with the filter that screen pack is formed.
The rate of water make-up ratio of three branch road moisturizings of described technique moisturizing is: the road moisturizing of first accounts for the 35-45% of overall process rate of water make-up, the road moisturizing of second accounts for the 3-5% of overall process rate of water make-up, the road moisturizing of the 3rd accounts for the 50-62% of overall process rate of water make-up, and the total rate of water make-up of three branch roads is 100%t/h.
The amount that waste water divides two-way to pick out by the waste pipe that the bottom of described waste water tank picks out is respectively: the waste water that a road is directly communicated with wet desulphurisation system accounts for the 30%t/h of total amount, and the waste water that another road connects prelimer accounts for 70% t/h of total amount; And be the 0.1-0.2 entering the total wastewater flow rate of prelimer from the concentrate bottom prelimer, enter in mist eliminator flushing water tank after all the other process.
The flushing water that wet-esp colelctor electrode flows down is collected to enter in waste water tank through ash bucket and is precipitated, and waste water tank upper strata primary water enters cyclic water tank, squeezes into wet-esp recycle by flushing water circulating pump; Waste water tank base section waste water directly can enter desulphurization system as sulfur removal technology water and use, all the other waste water then in prelimer after Separation of Solid and Liquid, top primary water flows into demister cleaning water tank, together with technique moisturizing via mist eliminator flushing water pump to demister, complete the flushing to demister.
The technical scheme that the present invention adopts wet-esp flushing water to combine with wet desulfurization system, the advantage of the program is: greatly saved the use water in the flue gas pollutant control procedure of thermal power plant, achieved recycling of flushing waste water.Reuse to Limestone-gypsum Wet Flue Gas Desulfurization Process system,
Figure of description
Fig. 1 is the wet-esp flushing water cyclic utilization system schematic flow sheet of the present invention for 1000MW unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be described in detail: shown in Fig. 1, a kind of wet-esp flushing water cyclic utilization system, it mainly comprises: after wet desulfurization system 1, have additional wet electrical dust precipitator 2, be provided with for collecting the ash bucket 3 flowing down flushing waste water from wet electrical dust precipitator colelctor electrode below described wet electrical dust precipitator 2, described ash bucket 3 is communicated with waste water tank 5 by adapter 4, by being communicated with one communicating pipe 6 with the cyclic water tank 8 adding and subtracting treating apparatus 7 on the upper strata sidewall of waste water tank 5, described cyclic water tank 8 is communicated with in the circulation 10 of wet electrical dust precipitator 2 by a flushing water circulating pump 9, the bottom of described waste water tank 5 is picked out by waste water pump 11 and directly or/and be communicated with wet desulphurisation system 1 after treatment.
Shown in figure, waste water divides two-way to pick out by the waste water pump 11 that the bottom of described waste water tank 5 picks out, one tunnel is directly communicated with wet desulphurisation system 1, another road connects the prelimer 12 that can carry out Separation of Solid and Liquid, this prelimer 12 is connected with one and primary water is sent into demister cleaning water tank 13, and be communicated with wet desulphurisation system 1 by a demister flushing water pump 14; The sludge pump 15 that bottom concentrate can be entered Waste Water Treatment is connected to by adapter bottom described prelimer 12.
Wet desulfurization system 1 of the present invention and wet electrical dust precipitator 2 are also connected to a road technique moisturizing 16, and described technique moisturizing 16 is divided into again three branch road moisturizings; Wherein the first branch road moisturizing 17 is directly communicated with after wet electrical dust precipitator 1, second branch road moisturizing 18 connects sulfur removal technology water tank 19 and is communicated with wet desulphurisation system 1; One the 3rd branch road moisturizing 20 is also had to be connected to mist eliminator flushing water tank 13.
Described plus-minus treating apparatus 7 comprises a lye tank 71, and this lye tank 71 adds alkali pump 72 by one and is communicated with cyclic water tank 8; Adapter after described flushing water circulating pump 9 is provided with the filter 21 that screen pack is formed.
The rate of water make-up ratio of three branch road moisturizings of described technique moisturizing 16 is: the road moisturizing 17 of first accounts for the 35-45% of overall process rate of water make-up, the road moisturizing 18 of second accounts for the 3-5% of overall process rate of water make-up, the road moisturizing 20 of the 3rd accounts for the 50-62% of overall process rate of water make-up, and the total rate of water make-up of three branch roads is 100%t/h.
The amount that waste water divides two-way to pick out by the waste pipe 11 that the bottom of described waste water tank 5 picks out is respectively: the waste water that a road is directly communicated with wet desulphurisation system accounts for the 30%t/h of total amount, and the waste water that another road connects prelimer accounts for 70% t/h of total amount; And be the 0.1-0.2 entering the total wastewater flow rate of prelimer from the concentrate bottom prelimer, enter in mist eliminator flushing water tank after all the other process.
Embodiment:
Shown in Fig. 1, wet-esp flushing water cyclic utilization system of the present invention is applied to a kind of schematic flow sheet of 1000MW unit, the flushing water of described wet-esp comprises the technique moisturizing that flush cycle water and flow are 40t/h, the flushing waste water flowed down from wet-esp colelctor electrode enters waste water tank after ash bucket collects, waste water tank upper strata primary water draws self-circulating water tank, after adding alkali neutralisation treatment, squeeze into wet-esp by flushing water circulating pump and carry out cycling and reutilization; Waste water bottom waste water tank is then as sulfur removal technology water.
Waste water bottom wet-esp flushing waste water case, the carrying out that wherein waste water of flow 12t/h directly can enter desulphurization system utilizes, residual flow is after the waste water of 28t/h enters and carries out Separation of Solid and Liquid in prelimer, in prelimer, primary water enters desulfuration absorbing tower demister cleaning water tank with the gravity flow of the flow of 26t/h, pump into desulfuration absorbing tower by demister flushing water pump to rinse demister together with the technique moisturizing that flow is 57t/h, realize the circulating and recovering of wet-esp flushing water; Bottom prelimer, concentrate then enters Waste Water Treatment by sludge pump with the flow of 2t/h.

Claims (6)

1. a wet-esp flushing water cyclic utilization system, it mainly comprises: after wet desulfurization system, have additional wet electrical dust precipitator, be provided with for collecting the ash bucket flowing down flushing waste water from wet electrical dust precipitator colelctor electrode below described wet electrical dust precipitator, described ash bucket is communicated with waste water tank by adapter, by being communicated with one communicating pipe with the cyclic water tank adding and subtracting treating apparatus on the upper strata sidewall of waste water tank, described cyclic water tank is communicated with in the circulation of wet electrical dust precipitator by a flushing water circulating pump;
The bottom of described waste water tank is picked out by waste pipe, and directly or/and be communicated with wet desulphurisation system after treatment.
2. wet-esp flushing water cyclic utilization system according to claim 1, it is characterized in that waste water divides two-way to pick out by the waste pipe that the bottom of described waste water tank picks out, one tunnel is directly communicated with wet desulphurisation system, another road connects the prelimer that can carry out Separation of Solid and Liquid, this prelimer is connected with one and primary water is sent into demister cleaning water tank, and be communicated with wet desulphurisation system by a demister flushing water pump; The sludge pump that bottom concentrate can be entered Waste Water Treatment is connected to by adapter bottom described prelimer.
3. wet-esp flushing water cyclic utilization system according to claim 1 and 2, it is characterized in that described wet desulfurization system and wet electrical dust precipitator are also connected to a road technique moisturizing, described technique moisturizing is divided into again three branch road moisturizings; Wherein the first branch road moisturizing is directly communicated with wet electrical dust precipitator, and the second branch road moisturizing is communicated with wet desulphurisation system after connecting sulfur removal technology water tank; One the 3rd branch road moisturizing is also had to be connected to mist eliminator flushing water tank.
4. wet-esp flushing water cyclic utilization system according to claim 1, it is characterized in that described plus-minus treating apparatus comprises a lye tank, this lye tank adds alkali pump by one and is communicated with cyclic water tank; Adapter after described flushing water circulating pump is provided with the filter that screen pack is formed.
5. wet-esp flushing water cyclic utilization system according to claim 3, it is characterized in that the rate of water make-up ratio of three branch road moisturizings of described technique moisturizing is: the road moisturizing of first accounts for the 35-45% of overall process rate of water make-up, the road moisturizing of second accounts for the 3-5% of overall process rate of water make-up, the road moisturizing of the 3rd accounts for the 50-62% of overall process rate of water make-up, and the total rate of water make-up of three branch roads is 100%t/h.
6. wet-esp flushing water cyclic utilization system according to claim 2, it is characterized in that amount that waste water divides two-way to pick out by the waste pipe that the bottom of described waste water tank picks out respectively: the waste water that a road is directly communicated with wet desulphurisation system accounts for the 30%t/h of total amount, the waste water that another road connects prelimer accounts for 70% t/h of total amount; And be the 0.1-0.2 entering the total wastewater flow rate of prelimer from the concentrate bottom prelimer, enter in mist eliminator flushing water tank after all the other process.
CN201410813131.1A 2014-12-24 2014-12-24 Cyclic utilization system of washing water of wet electric dust collector CN104549761B (en)

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CN104841170A (en) * 2015-05-12 2015-08-19 浙江天地环保工程有限公司 Hydroelectricity wastewater reuse system
CN105540898A (en) * 2016-02-01 2016-05-04 浙江天地环保工程有限公司 Ultra-low drainage wet type electric dedusting wastewater concentrated liquid treatment system
CN107413529A (en) * 2017-04-28 2017-12-01 浙江诚康钢管有限公司 A kind of foundry's dedusting water circulation system
CN109812827A (en) * 2019-02-01 2019-05-28 吐鲁番瑞德化轻有限公司 Smoke processing system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841170A (en) * 2015-05-12 2015-08-19 浙江天地环保工程有限公司 Hydroelectricity wastewater reuse system
CN105540898A (en) * 2016-02-01 2016-05-04 浙江天地环保工程有限公司 Ultra-low drainage wet type electric dedusting wastewater concentrated liquid treatment system
CN107413529A (en) * 2017-04-28 2017-12-01 浙江诚康钢管有限公司 A kind of foundry's dedusting water circulation system
CN109812827A (en) * 2019-02-01 2019-05-28 吐鲁番瑞德化轻有限公司 Smoke processing system

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