CN203402935U - Wastewater zero-discharging device for wet electrostatic precipitator - Google Patents

Wastewater zero-discharging device for wet electrostatic precipitator Download PDF

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Publication number
CN203402935U
CN203402935U CN201320371476.7U CN201320371476U CN203402935U CN 203402935 U CN203402935 U CN 203402935U CN 201320371476 U CN201320371476 U CN 201320371476U CN 203402935 U CN203402935 U CN 203402935U
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CN
China
Prior art keywords
waste water
electrostatic precipitator
storage tank
nozzle
electrical dust
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CN201320371476.7U
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Chinese (zh)
Inventor
王贵华
宋国亮
阮炯明
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华电电力科学研究院
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Priority to CN201320371476.7U priority Critical patent/CN203402935U/en
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Publication of CN203402935U publication Critical patent/CN203402935U/en

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Abstract

The utility model relates to a wastewater zero-discharging device for a wet electrostatic precipitator and a wastewater treatment method of the device. The device comprises a boiler, a denitrification device, an air pre-heater, an electrostatic precipitator, a desulfurization tower, the wet electrostatic precipitator and a chimney, which are connected in sequence through a flue, and is structurally characterized by also comprising a nozzle, a wastewater storage tank, a hydraulic pump and a high-pressure pump, wherein the water inlet end of the wastewater storage tank is connected with the wet electrostatic precipitator through a pipeline, and the water outlet end of the wastewater storage tank is connected with the flue through a mist spraying pipeline; the hydraulic pump and the high-pressure pump are arranged on the mist spraying pipeline; the nozzle is formed in the tail end of the mist spraying pipeline. The wastewater zero-discharging device for the wet electrostatic precipitator has the advantages of being reasonable in structural design, energy-saving, environment-friendly, and stable in operation, fully utilizing flue gas waste heat and realizing wastewater zero-discharging.

Description

Wet electrical dust precipitator waste water zero discharge device

Technical field

The utility model relates to a kind of wet electrical dust precipitator waste water zero discharge device, especially technology and the device of the zero release of wet electrical dust precipitator waste water smoke evaporative.Belong to thermal power generation field.

Background technology

China's energy structure be take coal as main, and thermal power generation accounts for the more than 70% of gross generation." fossil-fuel power plant atmospheric pollutant emission standard " GB13223-2011 has carried out stricter standard to smoke stack emission.Wet-esp is usually placed in after wet desulphurization as the final discharge equipment of checking on.

Wet electrical dust precipitator can discharge a certain amount of waste water in operational process from system.The wastewater discharge of general 300MW unit wet-esp is at 2~12 tons/hour.The wet waste water that removes is acid, contains the various impurity such as gypsum, heavy metal.Existing treatment process is in waste water, to add alkali to neutralize, and then does further processing.Therefore as long as wet-esp operation just must be bought alkali wet except waste water to neutralize.Get off for a long time, purchase alkali expense considerable, running cost increases.Meanwhile, treatment effect is limited, and environment is had to certain pollution.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of reasonable in design, makes full use of fume afterheat, energy-conserving and environment-protective, realize the wet electrical dust precipitator waste water zero discharge device of wastewater zero discharge.

It is this wet electrical dust precipitator waste water zero discharge device that the utility model solves the problems of the technologies described above adopted technical scheme, comprise boiler, denitrification apparatus, air preheater, electric precipitator, thionizer, wet electrical dust precipitator, chimney, above equipment connects successively by flue, its constructional feature is: be also provided with nozzle, waste water storage tank, liquid pump and high-pressure pump, the feed-water end of described waste water storage tank is connected by pipeline with wet electrical dust precipitator, the water side of described waste water storage tank is connected with flue by spray pipe, on spray pipe, be provided with liquid pump and high-pressure pump, described nozzle is arranged on the end of spray pipe.

As preferably, in the flue of the position of nozzle described in the utility model between air preheater and electric precipitator.Be positioned at the residual heat resources that this position can effectively utilize hot flue gas.

As preferably, on spray pipe described in the utility model, be provided with waste water current limliting valve.

The amount that waste water current limliting valve can regulate waste water to spray into according to practical situation, and can assist liquid pump to regulate pressure.

As preferably, between high-pressure pump described in the utility model and nozzle, be provided with pressure lock.

The compressed-air actuated amount that the high-pressure pump of can controlling pressure lock pumps, and play safe effect.

The utility model compared with the existing technology has the following advantages and effect: 1, because the waste heat utilizing flue gas will wet, all evaporate except waste water, realized wastewater zero discharge.2, utilize fully waste heat, saved the energy.3, not only do not affect electric precipitator operation, be of value on the contrary the raising of efficiency of dust collection.4, without adding in alkali and waste water, working cost is low, also environmental protection more.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is structural representation of the present utility model.

Label declaration: boiler 1, denitrification apparatus 2, air preheater 3, nozzle 4, electric precipitator 5, thionizer 6, wet electrical dust precipitator 7, chimney 8, waste water storage tank 9, liquid pump 10, high-pressure pump 11, waste water current limliting valve 12, spray pipe 13, pressure lock 14.

Embodiment

Below in conjunction with embodiment, the utility model is described in further detail, following examples are to explanation of the present utility model and the utility model is not limited to following examples.

Embodiment 1: as shown in Figure 1, the wet electrical dust precipitator waste water zero discharge device of the present embodiment is by boiler 1, denitrification apparatus 2, air preheater 3, nozzle 4, electric precipitator 5, thionizer 6, wet electrical dust precipitator 7, chimney 8, waste water storage tank 9, liquid pump 10, high-pressure pump 11, waste water current limliting valve 12, spray pipe 13 and pressure lock 14 form, boiler 1, denitrification apparatus 2, air preheater 3, electric precipitator 5, thionizer 6, wet electrical dust precipitator 7, chimney 8 is connected by flue successively, boiler 1 is discharged flue gas, entering denitrification apparatus 2 denitrations processes, then through air preheater 3, carry out the heat exchange of hot flue gas and air, enter electric precipitator 5 dedustings, by entering wet electrical dust precipitator 7 after thionizer 6 desulfurization, carry out secondary deep dedusting again, finally by chimney 8, discharged.Wherein, wet electrical dust precipitator 7 can discharge a certain amount of waste water in operational process from system, and the wastewater discharge of general 300MW unit wet-esp is at 2~12 tons/hour.The wet waste water that removes is acid, contains the various impurity such as gypsum, heavy metal.The utility model is provided with at the drainage position of wet electrical dust precipitator 7 pipeline of collecting waste water, waste water is deposited in to waste water storage tank 9, waste water storage tank 9 is connected with the flue between air preheater 3 and electric precipitator 5 by spray pipe 13, and be provided with nozzle 4 at the end of spray pipe 13, position near waste water storage tank 9 on spray pipe 13 is provided with liquid pump 10, high-pressure pump 11 is connected with nozzle 4 by pipeline, liquid pump 10 is high by waste water pump, high-pressure pump 11 pumps into pressurized air in waste water, high-pressure pump 11 and liquid pump 10 synergies by waste water atomization and spray into air preheater 3 and the flue of 5, electric precipitator in.On spray pipe 13, be provided with the waste water current limliting valve 12 of controlling wastewater flow.Between high-pressure pump 11 and nozzle 4, be provided with pressure lock 14, pressure lock 14 can regulate compressed-air actuated flow, and the pressure of compressed-air actuated pressure and flow and waste water and flow are matched.The wastewater flow rate and the effective waste heat amount of flue gas that spray into flue match, and with waste water current limliting valve 12, control.Utilize the waste heat of hot flue gas that waste water is all evaporated, the pollutent in waste water is converted into the solids such as crystallization or salt, is collected, thereby realize the wet zero release except waste water with together with flying dust in flue gas by electric precipitator 5.Flue gas continues by thionizer 6, wet electrical dust precipitator 7, emptying through chimney 8.

Application example: the subcritical coal-fired unit of certain 300MW of power plant, under 60% load, the exhaust gas volumn of discharging from boiler 1 is 730000Nm 3/ h, after denitrification apparatus 2 and air preheater 3, the temperature of flue gas is 120 ℃.Control the temperature of flue gas more than acid dew point, utilizing the transpirable wastewater flow rate of fume afterheat is 3.8 tons/hour, the waste water that wet electrical dust precipitator 7 produces enters in waste water storage tank 9, the actual wet-esp wastewater flow rate producing is 3.5 tons/hour, through liquid pump 10, high-pressure pump 11, from spraying into flue, nozzle 4 can all evaporate, impurity in waste water forms the solids such as crystallization, salt, with flying dust, by electric precipitator 5, is collected.Under 80% load, transpirable wastewater flow rate is 10.5 tons/hour, and the actual wastewater flow rate producing is 4.7 tons/hour; Under 100% load, transpirable wastewater flow rate is 14 tons/hour, and the actual wastewater flow rate producing is 5.8 tons/hour.The transpirable wastewater flow rate of flue gas is greater than the wastewater flow rate of actual generation, and the wet waste water that removes that reality can be produced all evaporates.Flue gas, after the thionizer 6 and wet electrical dust precipitator 7 of wet desulphurization, enters atmosphere by chimney 8.

In operational process, because the temperature of flue gas has certain reduction (more than being controlled at acid dew point) because spraying into waste water temperature, can reduce desulfurization entrance for reducing the consumption of the fresh water of cigarette temperature, be of value to the raising of electric precipitator 5 efficiency of dust collections simultaneously.

In operational process, when the temperature of flue gas is to a certain extent low, close liquid pump 10 and high-pressure pump 11, stop spraying into waste water, the temporary transient collection of waste water is stored in waste water storage tank 9, the temperature of flue gas sprays into evaporation process after raising again by the time.

In addition, it should be noted that, the specific embodiment described in this specification sheets, the shape of its parts and components, institute's title of being named etc. can be different.All equivalence or simple change of doing according to described structure, feature and the principle of the utility model patent design, are included in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present utility model or surmount this scope as defined in the claims, all should belong to protection domain of the present utility model.

Claims (4)

1. a wet electrical dust precipitator waste water zero discharge device, comprise boiler, denitrification apparatus, air preheater, electric precipitator, thionizer, wet electrical dust precipitator, chimney, above equipment connects successively by flue, it is characterized in that: be also provided with nozzle, waste water storage tank, liquid pump and high-pressure pump, the feed-water end of described waste water storage tank is connected by pipeline with wet electrical dust precipitator, the water side of described waste water storage tank is connected with flue by spray pipe, on spray pipe, be provided with liquid pump and high-pressure pump, described nozzle is arranged on the end of spray pipe.
2. wet electrical dust precipitator waste water zero discharge device according to claim 1, is characterized in that: in the flue of the position of described nozzle between air preheater and electric precipitator.
3. wet electrical dust precipitator waste water zero discharge device according to claim 1, is characterized in that: on described spray pipe, be provided with waste water current limliting valve.
4. wet electrical dust precipitator waste water zero discharge device according to claim 1, is characterized in that: between described high-pressure pump and nozzle, be provided with pressure lock.
CN201320371476.7U 2013-06-26 2013-06-26 Wastewater zero-discharging device for wet electrostatic precipitator CN203402935U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103318981A (en) * 2013-06-26 2013-09-25 华电电力科学研究院 Wastewater zero-discharging device with wet-type electric precipitator and wastewater treatment method of wastewater zero-discharging device
CN103982903A (en) * 2014-05-20 2014-08-13 西安热工研究院有限公司 System and method for treating tail end waste water by using smoke waste heat
CN103982904A (en) * 2014-04-28 2014-08-13 浙江巨化热电有限公司 Novel comprehensive flue gas treatment system and method
CN105502877A (en) * 2015-11-30 2016-04-20 林斌炎 Integrated treatment system for coal-fired flue gas and sludge
CN105664687A (en) * 2016-03-30 2016-06-15 浙江菲达环保科技股份有限公司 Smoke co-processing technique based on wet type electric precipitator
CN107596883A (en) * 2017-09-22 2018-01-19 华电电力科学研究院 A kind of desulfurization wastewater Zero discharging system and its method of work

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103318981A (en) * 2013-06-26 2013-09-25 华电电力科学研究院 Wastewater zero-discharging device with wet-type electric precipitator and wastewater treatment method of wastewater zero-discharging device
CN103982904A (en) * 2014-04-28 2014-08-13 浙江巨化热电有限公司 Novel comprehensive flue gas treatment system and method
CN103982903A (en) * 2014-05-20 2014-08-13 西安热工研究院有限公司 System and method for treating tail end waste water by using smoke waste heat
CN105502877A (en) * 2015-11-30 2016-04-20 林斌炎 Integrated treatment system for coal-fired flue gas and sludge
CN105664687A (en) * 2016-03-30 2016-06-15 浙江菲达环保科技股份有限公司 Smoke co-processing technique based on wet type electric precipitator
CN107596883A (en) * 2017-09-22 2018-01-19 华电电力科学研究院 A kind of desulfurization wastewater Zero discharging system and its method of work

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