CN209646232U - Flue gas dechlorination-desulfurization wastewater zero-emission control system - Google Patents
Flue gas dechlorination-desulfurization wastewater zero-emission control system Download PDFInfo
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- CN209646232U CN209646232U CN201822256110.0U CN201822256110U CN209646232U CN 209646232 U CN209646232 U CN 209646232U CN 201822256110 U CN201822256110 U CN 201822256110U CN 209646232 U CN209646232 U CN 209646232U
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Abstract
The utility model discloses the control systems and method of a kind of flue gas dechlorination-desulfurization wastewater zero-emission.The utility model measures the analysis chlorine ion concentration rate of climb according to chlorine ion concentration on-line detector, according to the chlorine ion concentration rate of climb and load signal, determines high concentration alkali flow quantity required for flue gas dechlorination, and then control the operation of lye metering pump.Pit level and load signal are clarified according to desulfurization wastewater, determines the solvent flux for meeting desulfurization wastewater discharge amount closed cycle demand, and then control the aperture of solvent adjustment valve.According to solvent baffle-box liquid level and desulfurization wastewater clarifying basin Liquid level desulfurization wastewater water pump and supplement water valve.Enter atomizer after high-concentration alkali liquor and the uniform mixed diluting of solvent, the HCl gas in dilution lye removing flue gas, to control desulfurization wastewater discharge amount, when normal operation, solvent flux is consistent with desulfurization wastewater discharge amount, realizes that desulfurization wastewater zero delivery is discharged.
Description
Technical field
The utility model belongs to energy-conserving and emission-cutting technology field, is related to a kind of control of flue gas dechlorination-desulfurization wastewater zero-emission
System and method.
Background technique
With the issuing and implementation of " national water prevention and cure of pollution plan " (" ten, water "), waste water discharge-reducing, reuse and zero-emission work
Have become one of the vital task in thermal power plant.Currently, the Thermal generation unit that 90% or more China has put into operation is equal
Using wet desulfurization of flue gas by limestone-gypsum method technique (abbreviation wet desulphurization), wet desulphurization is the ion controlled in desulfurization slurry
Concentration needs to discharge certain desulfurization wastewater.Various ions in desulfurization wastewater containing high concentration, direct emission can generate seriously
Pollution, generally will do it certain purified treatment, but wherein chloride ion is more intractable using conventional method, therefore, it is difficult to
Realize desulfurization wastewater zero-emission.In order to realize desulfurization wastewater zero-emission, the country has carried out a large amount of R&D work, has occurred more
Engineering mimoir application has been carried out in kind desulfurization wastewater zero-discharge technology technique, portion of techniques, but it is multiple to be usually present system
Miscellaneous, investment and operating cost is big, secondary pollution problems, or exist and have the problems such as larger impact to unit safety operation.Invention
For people it is proposed that a kind of new technology for realizing desulfurization wastewater zero-emission by flue gas dechlorination, principle is using lye by flue gas
In the highly acids gas removal such as most of HCl, to be greatly reduced in the case where desulfurization slurry intermediate ion concentration is constant
Desulfurization wastewater flow, the desulfurization wastewater after amount of decrease is recycled as base solvent, to realize the zero delivery of desulfurization wastewater
Discharge.The technology has applied for related patents.The early period of the technology is theoretical, test, pilot scale research result shows that it has sufficiently
Feasibility, have many advantages, such as that system is simple, investment is low with operating cost, safety is good, adaptable, without secondary pollution.For
Realize flue gas dechlorination-desulfurization wastewater zero-discharge technology engineer application, reasonable control system and effective control method are not
Important link but can be neglected.
Summary of the invention
To realize that flue gas dechlorination-desulfurization wastewater zero-discharge technology engineer application, the utility model provide a kind of flue gas
Dechlorination-desulfurization wastewater zero-emission control system and method.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
The utility model include chlorine ion concentration on-line detector, desulfurization wastewater water pump, supplement water valve, solvent baffle-box,
High-pressure hydraulic pump, solvent adjustment valve, solvent flux meter, high concentration alkali liquid storage tank, lye metering pump, dilution mixer, atomizer,
It further include control logic, the control logic of solvent baffle-box of high concentration alkali flow quantity and solvent flux.
The chlorine ion concentration on-line detector, for the chlorine ion concentration in slurries in real-time measurement desulfurizing tower.
The desulfurization wastewater water pump, for injecting the desulfurization wastewater in desulfurization wastewater clarifying basin in solvent baffle-box.
The supplement water valve, for being likely to occur the situation of desulfurization wastewater storage deficiency during Unit Commitment or adjustment
Under, it is temporarily substituted with other make-up water sources.Make-up water source may be from the process water of desulphurization system.
The solvent baffle-box, for storing the desulfurization wastewater or supplement water that are used as base solvent.In solvent baffle-box
It is disposed with liquidometer, desulfurization wastewater water pump or supplement water valve are controlled according to the variation of liquidometer.Due to existing in desulfurization wastewater
Certain solid particle arranges disturbance device in solvent baffle-box to avoid solids particles precipitate.
The high-pressure hydraulic pump for by the continuous supply of base solvent, and provides pressure required for base soln atomization
Head.
The solvent adjustment valve, for adjusting base solvent flux.
The solvent flux meter feeds back according to required flow target value and controls for measuring the flow of base solvent
The aperture of solvent adjustment valve 6 processed.
The high concentration alkali liquid storage tank, for storing configured high-concentration alkali liquor.
The lye metering pump, for injecting high-concentration alkali liquor in solvent, lye metering pump is according to alkali number demand control
Make its uninterrupted.
Affiliated dilution mixer, for by high-concentration alkali liquor with solvent is full and uniform mixes.
The atomizer, for diluted lye to be atomized, atomized drop with flue gas is full and uniform mixes, realize alkali
Liquid is rapidly and efficiently reacted with sour gas such as HCl in flue gas and rapid evaporation.
The control logic of the high concentration alkali flow quantity and solvent flux: according to the chlorine ion concentration rate of climb and load
Signal determines high concentration alkali flow quantity required for flue gas dechlorination, and then controls the operation of lye metering pump.According to desulfurization wastewater
Pit level and load signal are clarified, determines the solvent flux for meeting desulfurization wastewater discharge amount closed cycle demand, and then control molten
The aperture of agent regulating valve.
The load signal can directly utilize flue gas flow for the coherent signal for characterizing flue gas in flue amount
Measured value, but the general accuracy of the measured value is poor, it can be using boiler fired coal amount, generation load, boiler feedwater flow etc.
Measuring signal.According to load signal, the theoretical discharge amount of desulfurization wastewater is determined, and then determine the mesh of the chlorine ion concentration rate of climb
Scale value.According to load signal, the solvent flux target zone for meeting flue gas dechlorination safe and highly efficient operation is also determined.
The chlorine ion concentration rate of climb utilizes desulfurization in desulfurizing tower measured by chlorine ion concentration on-line detector
Real-time chlorine ion concentration curve in slurries obtains the pace of change of chlorine ion concentration by signal filtering processing and differential, chlorine from
The pace of change of sub- increasing concen-trations is the chlorine ion concentration rate of climb.Because of the measurement of low concentration HCl gas concentration in flue gas
It is relatively difficult, and two sets of measuring devices are needed before and after flue gas dechlorination, investment is higher with maintenance cost, therefore, using de-
The chlorine ion concentration rate of climb in sulphur slurries characterizes HCl gas concentration and its removal effect in flue gas.Using chloride ion
Another beneficial effect of concentration rate of climb signal is, the essential purpose of flue gas dechlorination be in order to reduce desulfurization wastewater flow,
The control chlorine ion concentration rate of climb controls desulfurization wastewater discharge amount, without considering in original flue gas caused by coal type change
The variation of HCl gas concentration.According to the obtained chlorine ion concentration rate of climb target value of load signal, high-concentration alkali liquor is controlled
Flow keeps the practical chlorine ion concentration rate of climb consistent with target value.
The desulfurization wastewater clarifies pit level, arranges liquidometer in desulfurization wastewater clarifying basin, according to actual measurement liquid level
Size and variation tendency in the solvent flux target zone determined by load signal, determine solvent flux target value.
The control logic of the solvent baffle-box: according to solvent baffle-box liquid level and desulfurization wastewater clarifying basin Liquid level
Desulfurization wastewater water pump and supplement water valve.
The solvent baffle-box liquid level, arranges liquidometer in solvent baffle-box, in real-time measurement solvent baffle-box
Liquid level.The solvent baffle-box liquid level upper limit, middle limit, lower limit are set, desulfurization wastewater clarifying basin liquid level lower limit is set.When solvent baffle-box
Liquid level starts desulfurization wastewater water pump, injects to solvent baffle-box lower than middle limit and when desulfurization wastewater clarification pit level is higher than lower limit
Desulfurization wastewater stops desulfurization wastewater water pump when solvent baffle-box liquid level is higher than the upper limit.When solvent baffle-box liquid level is lower than lower limit
When, supplement water valve is opened, injects supplement water to solvent baffle-box, when in limited time, closing supplement water during solvent baffle-box liquid level is higher than
Valve.
The utility model has the beneficial effect that:
The purpose of this utility model is exactly to realize recycling for desulfurization wastewater by targetedly control system and method
With stable operation, the stable operation of lye system, for the tune of alkali number and the variations such as quantity of solvent random groups load and flue gas chlorinty
Section control.
The utility model is the essence of flue gas dechlorination using another beneficial effect of chlorine ion concentration rate of climb signal
Purpose is to reduce desulfurization wastewater flow, and the control chlorine ion concentration rate of climb controls desulfurization wastewater discharge amount, is not necessarily to
Consider the variation of HCl gas concentration in original flue gas caused by coal type change.According on the obtained chlorine ion concentration of load signal
Lifting speed target value controls high concentration alkali flow quantity, keeps the practical chlorine ion concentration rate of climb consistent with target value.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the utility model.
In Fig. 1: 1, chlorine ion concentration on-line detector；2, desulfurization wastewater water pump；3, water valve is supplemented；4, solvent baffle-box；
5, high-pressure hydraulic pump；6, solvent adjustment valve；7, solvent flux meter；8, high concentration alkali liquid storage tank；9, lye metering pump；10, dilution is mixed
Clutch；11, atomizer.
Fig. 2 is the control logic figure of high concentration alkali flow quantity and solvent flux.
Fig. 3 is the control logic figure of solvent baffle-box.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of control system and method for flue gas dechlorination-desulfurization wastewater zero-emission, including chlorine ion concentration
On-line detector 1, desulfurization wastewater water pump 2, supplement water valve 3, solvent baffle-box 4, high-pressure hydraulic pump 5, solvent adjustment valve 6, solvent stream
Meter 7, high concentration alkali liquid storage tank 8, lye metering pump 9, dilution mixer 10, atomizer 11.
The chlorine ion concentration on-line detector 1, for the chlorine ion concentration in slurries in real-time measurement desulfurizing tower.
The desulfurization wastewater water pump 2, for the desulfurization wastewater in desulfurization wastewater clarifying basin to be injected solvent baffle-box 4
In.
The supplement water valve 3, for being likely to occur the insufficient feelings of desulfurization wastewater storage during Unit Commitment or adjustment
Under condition, temporarily substituted with other make-up water sources.Make-up water source may be from the process water of desulphurization system.
The solvent baffle-box 4, for storing the desulfurization wastewater or supplement water that are used as base solvent.Solvent baffle-box 4
It is inside disposed with liquidometer, desulfurization wastewater water pump 2 or supplement water valve 3 are controlled according to the variation of liquidometer.Due in desulfurization wastewater
There are certain solid particles, to avoid solids particles precipitate, arrange disturbance device in solvent baffle-box 4.
The high-pressure hydraulic pump 5 for by the continuous supply of base solvent, and provides pressure required for base soln atomization
Head.
The solvent adjustment valve 6, for adjusting base solvent flux.
The solvent flux meter 7 feeds back according to required flow target value and controls for measuring the flow of base solvent
The aperture of solvent adjustment valve 6 processed.
The high concentration alkali liquid storage tank 8, for storing configured high-concentration alkali liquor.
The lye metering pump 9, for injecting high-concentration alkali liquor in solvent, lye metering pump 9 is according to alkali number demand
Control its uninterrupted.
Affiliated dilution mixer 10, for by high-concentration alkali liquor with solvent is full and uniform mixes.
The atomizer 11, for diluted lye to be atomized, atomized drop with flue gas is full and uniform mixes, realize
Lye is rapidly and efficiently reacted with sour gas such as HCl in flue gas and rapid evaporation.
As shown in Fig. 2, the control logic of high concentration alkali flow quantity and solvent flux: according to the chlorine ion concentration rate of climb with
Load signal determines high concentration alkali flow quantity required for flue gas dechlorination, and then controls the operation of lye metering pump.According to desulfurization
Waste water clarifies pit level and load signal, determines the solvent flux for meeting desulfurization wastewater discharge amount closed cycle demand, and then control
The aperture of solvent adjustment valve processed.
The load signal can directly utilize flue gas flow for the coherent signal for characterizing flue gas in flue amount
Measured value, but the general accuracy of the measured value is poor, it can be using boiler fired coal amount, generation load, boiler feedwater flow etc.
Measuring signal.According to load signal, the theoretical discharge amount of desulfurization wastewater is determined, and then determine the mesh of the chlorine ion concentration rate of climb
Scale value.According to load signal, the solvent flux target zone for meeting flue gas dechlorination safe and highly efficient operation is also determined.
The chlorine ion concentration rate of climb utilizes desulfurization in desulfurizing tower measured by chlorine ion concentration on-line detector
Real-time chlorine ion concentration curve in slurries obtains the pace of change of chlorine ion concentration by signal filtering processing and differential, chlorine from
The pace of change of sub- increasing concen-trations is the chlorine ion concentration rate of climb.Because of the measurement of low concentration HCl gas concentration in flue gas
It is relatively difficult, and two sets of measuring devices are needed before and after flue gas dechlorination, investment is higher with maintenance cost, therefore, using de-
The chlorine ion concentration rate of climb in sulphur slurries characterizes HCl gas concentration and its removal effect in flue gas.Using chloride ion
Another beneficial effect of concentration rate of climb signal is, the essential purpose of flue gas dechlorination be in order to reduce desulfurization wastewater flow,
The control chlorine ion concentration rate of climb controls desulfurization wastewater discharge amount, without considering in original flue gas caused by coal type change
The variation of HCl gas concentration.According to the obtained chlorine ion concentration rate of climb target value of load signal, high-concentration alkali liquor is controlled
Flow keeps the practical chlorine ion concentration rate of climb consistent with target value.
The desulfurization wastewater clarifies pit level, arranges liquidometer in desulfurization wastewater clarifying basin, according to actual measurement liquid level
Size and variation tendency in the solvent flux target zone determined by load signal, determine solvent flux target value.
As shown in figure 3, the control logic of solvent baffle-box: clarifying pit level according to solvent baffle-box liquid level and desulfurization wastewater
Control desulfurization wastewater water pump and supplement water valve.
The solvent baffle-box liquid level, arranges liquidometer in solvent baffle-box, in real-time measurement solvent baffle-box
Liquid level.The solvent baffle-box liquid level upper limit, middle limit, lower limit are set, desulfurization wastewater clarifying basin liquid level lower limit is set.When solvent baffle-box
Liquid level starts desulfurization wastewater water pump, injects to solvent baffle-box lower than middle limit and when desulfurization wastewater clarification pit level is higher than lower limit
Desulfurization wastewater stops desulfurization wastewater water pump when solvent baffle-box liquid level is higher than the upper limit.When solvent baffle-box liquid level is lower than lower limit
When, supplement water valve is opened, injects supplement water to solvent baffle-box, when in limited time, closing supplement water during solvent baffle-box liquid level is higher than
Valve.
Claims (1)
1. flue gas dechlorination-desulfurization wastewater zero-emission control system, it is characterised in that including chlorine ion concentration on-line detector, take off
Sulphur waste water water pump, supplement water valve, solvent baffle-box, high-pressure hydraulic pump, solvent adjustment valve, solvent flux meter, high concentration alkali liquid storage tank,
Lye metering pump, dilution mixer, atomizer；
The chlorine ion concentration on-line detector is arranged in desulfurizing tower, for the chlorine in slurries in real-time measurement desulfurizing tower
Ion concentration；
The desulfurization wastewater water pump is arranged between desulfurization wastewater clarifying basin and solvent baffle-box, and being used for for baffle-box will
In desulfurization wastewater injection solvent baffle-box in desulfurization wastewater clarifying basin；
The supplement water valve, for being likely to occur during Unit Commitment or adjustment in the insufficient situation of desulfurization wastewater storage,
It is temporarily substituted with its make-up water source；Make-up water source may be from the process water of desulphurization system；
The solvent baffle-box, for storing the desulfurization wastewater or supplement water that are used as base solvent；Arrangement in solvent baffle-box
There is liquidometer, desulfurization wastewater water pump or supplement water valve are controlled according to the variation of liquidometer；Simultaneously to avoid solids particles precipitate,
Disturbance device is arranged in solvent baffle-box；
The high-pressure hydraulic pump for the continuous supply of base solvent, and provides pressure head required for base soln is atomized；
The solvent adjustment valve, for adjusting base solvent flux；
The solvent flux meter, it is molten according to required flow target value feedback control for measuring the flow of base solvent
The aperture of agent regulating valve；
The high concentration alkali liquid storage tank, for storing configured high-concentration alkali liquor；
The lye metering pump, for by high-concentration alkali liquor inject solvent in, lye metering pump according to alkali number demand control its
Uninterrupted；
Affiliated dilution mixer, for by high-concentration alkali liquor with solvent is full and uniform mixes；
The atomizer, for diluted lye to be atomized, atomized drop with flue gas is full and uniform mixes, realize lye with
Sour gas in flue gas rapidly and efficiently reacts and rapid evaporation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822256110.0U CN209646232U (en) | 2018-12-29 | 2018-12-29 | Flue gas dechlorination-desulfurization wastewater zero-emission control system |
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|---|---|---|---|
| CN201822256110.0U CN209646232U (en) | 2018-12-29 | 2018-12-29 | Flue gas dechlorination-desulfurization wastewater zero-emission control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603502A (en) * | 2018-12-29 | 2019-04-12 | 浙江大学 | A kind of control system and method for flue gas dechlorination-desulfurization wastewater zero-emission |
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- 2018-12-29 CN CN201822256110.0U patent/CN209646232U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603502A (en) * | 2018-12-29 | 2019-04-12 | 浙江大学 | A kind of control system and method for flue gas dechlorination-desulfurization wastewater zero-emission |
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