CN111410253B - Desulfurization wastewater concentrated solution atomization device and atomization anti-blocking method - Google Patents
Desulfurization wastewater concentrated solution atomization device and atomization anti-blocking method Download PDFInfo
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- CN111410253B CN111410253B CN202010170867.7A CN202010170867A CN111410253B CN 111410253 B CN111410253 B CN 111410253B CN 202010170867 A CN202010170867 A CN 202010170867A CN 111410253 B CN111410253 B CN 111410253B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Y02A20/138—Water desalination using renewable energy
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Abstract
The invention discloses a desulfurization waste water concentrated solution atomization device and an atomization anti-blocking method, which belong to the field of environment protection devices and comprise a double-fluid spray gun, wherein a spray head of the double-fluid spray gun is positioned in a distillation flue, two inlets of the double-fluid spray gun are respectively connected with a jet pump and a gas-water mixer, the jet pump is connected with a desulfurization waste water concentrated solution storage tank, the gas-water mixer is connected with a compressed air storage tank and a humidifying water pump, an adjusting valve is connected between the humidifying water pump and the gas-water mixer, compressed air can be humidified through the humidifying water pump, so that the moisture content of the desulfurization waste water concentrated solution at the spray head is increased, the time of water distillation is reduced, the blockage of the spray head and the spray head caused by the excessively fast separation of gypsum suspended particles is avoided, and the problem that the spray gun is easily blocked in the prior art is solved.
Description
Technical Field
The invention relates to an environment-friendly device, in particular to a concentrated solution atomizing device for desulfurization wastewater.
Background
A limestone-gypsum method is largely adopted in the desulfurization process of thermoelectric units in China, and a certain amount of desulfurization wastewater can be generated by the process. At present, effective treatment methods include chemical methods of neutralization, flocculation and precipitation and zero-discharge methods of concentrated and evaporated wastewater according to the characteristics of the desulfurization wastewater. The concentrated wastewater in the wastewater zero discharge method has the characteristics of high salinity and containing large-age fine gypsum particle suspended matters, is atomized by using a double-fluid spray gun and then is sprayed into a drying flue, and in the process, the water in the atomized mixture is quickly dried by high-temperature flue gas at the outlet of a nozzle, so that the nozzle is easy to scale, the atomization effect of the spray gun is reduced, a large amount of wet blocks are formed in the drying flue and a downstream electric precipitator, the blockage and the corrosion are caused, and the operation of a unit is seriously influenced.
For example, the "desulfurization wastewater treatment system" disclosed in the chinese patent literature, which is published under the publication number CN206645857U, includes an atomizing nozzle and a steam drying tower, and has the disadvantages that when the desulfurization wastewater leaves from the atomizing nozzle, water can be quickly evaporated to dryness, so that particles in the desulfurization wastewater can be quickly separated out, thereby causing the structure at the nozzle, reducing the atomizing effect of the spray gun, causing a large amount of wet blocks in an evaporation flue and a downstream electric precipitator, causing blockage and corrosion, and seriously affecting the operation of a unit.
Disclosure of Invention
The invention aims to solve the problem that a spray head is easy to block in the spraying process of desulfurization wastewater in the prior art, and provides a desulfurization wastewater concentrated solution atomization device which can slow down the evaporation speed of water at the spray head to avoid the spray head blocking.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a desulfurization waste water concentrated solution atomization device which comprises a double-fluid spray gun, wherein a spray head of the double-fluid spray gun is positioned in a drying flue, two inlets of the double-fluid spray gun are respectively connected with a spray pump and a gas-water mixer, the spray pump is connected with a desulfurization waste water concentrated solution storage tank, the gas-water mixer is connected with a compressed air storage tank and a humidification water pump, an adjusting valve is connected between the humidification water pump and the gas-water mixer, the adjusting valve is connected with a fine atomization nozzle, and the fine atomization nozzle is arranged in the gas-water mixer.
The temperature in the evaporation flue is about 100-140 ℃, the desulfurization waste water concentrated solution is generated by concentrating and filtering waste water generated by a limestone-gypsum method desulfurization system, and contains a large amount of fine gypsum particle suspended matters, the salt content is high, and the density is 1150 kg/m-3When the temperature is between 50 and 70 ℃, after the gypsum enters the main channel of the two-fluid spray gun, the temperature of the concentrated solution of the desulfurization waste water is increased because part of the two-fluid spray gun is positioned in a drying flue, so that gypsum suspended particles are easy to be in the gun bodySeparating out; when the gypsum powder is sprayed from a spray head of a spray gun, the moisture contained in the gypsum powder can be quickly evaporated due to the small atomized particle size, and the gypsum particle suspension in the concentrated solution is also separated out and blocks the spray head. The moisture-increasing water is mixed into the compressed air, so that the water content of the desulfurization waste water concentrated solution can be increased, the temperature of the desulfurization waste water concentrated solution heated by high-temperature flue gas in a gun body is not higher than 80 ℃, gypsum suspended particles are prevented from being separated out in the gun body, the time for drying the gypsum particle suspended substances after being sprayed out of a spray head is delayed, and the spray head is prevented from being blocked; the regulating valve between the humidifying water pump and the air-water mixer can be used for controlling the content of the increased water, and the gun body and the spray nozzle can be ensured not to be blocked and the temperature change of the high-temperature flue gas can be ensured to be stable by regulating the water content.
Preferably, the two-fluid spray gun comprises a spray head and a gun body, a main channel and a gas channel are arranged in the gun body, the main channel is connected with the gas channel through a connecting channel, an impeller is arranged in the main channel, a plurality of blades are arranged on the impeller, and the connecting channel faces the blades of the impeller; the desulfurization waste water concentrated solution is introduced from the main channel, the humidifying water is atomized through the micro atomizing nozzle, the atomized particle size is 30-100 mu m, the atomized water is mixed with the compressed air in the gas-water mixer, the mixed steam formed after mixing is introduced from the gas channel, and when the mixed steam enters the main channel from the connecting channel, the blades of the impeller in the connecting channel can be blown, so that the impeller rotates, and in the rotating process of the impeller, the mixing of the desulfurization waste water concentrated solution and the mixed steam in the main channel can be strengthened, so that the humidifying water is uniformly dispersed into the desulfurization waste water concentrated solution, and the phenomenon that partial particles are separated out at the spray head due to the fact that the concentration of the desulfurization waste water concentrated solution is not uniform is avoided.
Preferably, the impeller comprises a forward rotation impeller and a reverse rotation impeller, and the forward rotation impeller and the reverse rotation impeller are arranged in the main channel at intervals; the rotation directions of the forward rotation impeller and the reverse rotation impeller are opposite, so that the movement direction of the desulfurization wastewater concentrated solution in the main channel is continuously changed, and the chaos degree of the movement of the gypsum particle suspended matters is increased, so that the mixing of the desulfurization wastewater concentrated solution and the mixed steam is accelerated, the humidifying water is uniformly dispersed into the desulfurization wastewater concentrated solution, and partial particles are still separated out at the spray head due to the fact that the concentration of the desulfurization wastewater concentrated solution is not uniform.
Preferably, the included angle between the blades of the impeller and the axial direction of the impeller is 10-40 degrees, the plane where the blades are located is not coincident with the axial direction of the impeller but has a certain angle, so that the desulfurization waste water concentrated solution in the main channel can be pushed forwards like a fan in the rotating process of the impeller, the desulfurization waste water concentrated solution can be accelerated continuously in the main channel, and the problem that the spraying speed of the desulfurization waste water concentrated solution at a spray head is insufficient due to the fact that a gun body is too long is solved; too small an angle will result in insufficient force to accelerate the desulfurization wastewater concentrate, and too large an angle will result in insufficient force to push the impeller to rotate when the mixed steam enters the main channel.
Preferably, the spray head is provided with an atomization hole, the evaporated flue gas flows to the dust remover from the air preheater, and the atomization hole is positioned on one side of the spray head, which faces the dust remover; the orientation of the atomization holes is consistent with the flow direction of the flue gas, so that the phenomenon that the concentrated desulfurization wastewater at the spray head is too high in evaporation speed due to the fact that high-temperature gas in the evaporation flue is directly blown to the spray head can be avoided.
Preferably, a horn-shaped spray head protective sleeve is arranged outside the spray head; the spray head sheath can prevent the high-temperature gas in the evaporated flue from fully contacting with the concentrated desulfurization wastewater at the spray head to cause the water in the concentrated desulfurization wastewater to be quickly evaporated; the nozzle sheath is horn-shaped, so that the blockage of the opening of the nozzle sheath by particles separated out from the desulfurization wastewater concentrated solution can be avoided.
A desulfurization wastewater concentrated solution atomization anti-blocking method comprises the following steps:
firstly, conveying the humidifying water to a gas-water mixer through a humidifying water pump to be mixed with compressed air, and enabling mixed steam to enter a gas channel of a double-fluid spray gun; simultaneously, the concentrated solution of the desulfurization wastewater enters a main channel of a double-fluid spray gun through a jet pump;
secondly, after the desulfurization wastewater and the mixed steam are fully mixed in the double-fluid spray gun, the mixture is atomized and sprayed out to a drying flue through a spray head;
regulating the amount of humidifying water q by controlling the opening of the regulating valvem,wAnd ensuring that the temperature change amplitude is not more than +/-1 ℃ after the high-temperature flue gas in the flue is evaporated to dryness and the atomized liquid is evaporated to dryness.
Humidification water is mixed into the compressed air through the humidification water pump, so that the evaporation speed of the desulfurization wastewater can be slowed down, and the spray head is prevented from being blocked by separated particles caused by evaporation at the spray head; by measuring the temperature of the front and the back of the spray head and adjusting the amount of the humidifying water by the adjusting valve, the temperature in the evaporation flue can be prevented from being obviously reduced due to water evaporation.
Therefore, the invention has the following beneficial effects: (1) the water content of the desulfurization wastewater concentrated solution is improved, and the desulfurization wastewater concentrated solution is not easy to separate out in a gun body and block caused by rapid evaporation at a spray head; (2) the desulfurization waste water concentrated solution and the mixed steam are mixed more uniformly, so that the concentration of the desulfurization waste water concentrated solution is ensured to be more uniform; (3) when the impeller rotates, the concentrated solution of the desulfurization wastewater can be pushed forward, so that the over-slow injection speed at the spray head is avoided; (4) the atomized desulfurization wastewater concentrated solution sprayed out of the spray head cannot be directly and fully contacted with high-temperature gas in the evaporation flue, so that the evaporation is slowed down; (5) the temperature reduction range of the atomized liquid evaporated by the high-temperature flue gas is ensured to be stabilized within a small range.
Drawings
Fig. 1 is an overall layout of the present invention.
FIG. 2 is a schematic view of one construction of the dual fluid spray gun of the present invention.
FIG. 3 is a cross-sectional view of the two-fluid spray gun of the present invention taken along the section line of FIG. 2A-A.
FIG. 4 is a cross-sectional view of the two-fluid spray gun of the present invention taken along the section line of FIG. 2B-B.
In the figure: 1. the device comprises a humidifying water pump 2, a regulating valve 3, a pressure gauge 4, a flowmeter 5, a check valve 6, a compressed air storage tank 7, a micro-fine atomizing nozzle 8, a gas-water mixer 9, a two-fluid spray gun 91, a spray head 92, a gun body 93, a main channel 94, a gas channel 95, an impeller 96, blades 97, a connecting channel 98, atomizing holes 99, a spray head sheath 10, a desulfurization waste water concentrated solution storage tank 11, a jet pump 12 and a drying flue.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
In the embodiment shown in fig. 1-4, a desulfurization waste water concentrate atomization anti-blocking device comprises a two-fluid spray gun 9, wherein a spray head of the two-fluid spray gun is positioned in a evaporation flue 12, two inlets of the two-fluid spray gun are respectively connected with a jet pump 11 and a gas-water mixer 8, the jet pump is connected with a desulfurization waste water concentrate storage tank 10, the gas-water mixer is connected with a compressed air storage tank 6 and a humidifying water pump 1, a regulating valve 2, a pressure gauge 3, a flowmeter 4, a check valve 5 and a fine atomization nozzle 7 are sequentially connected between the humidifying water pump and the gas-water mixer, and the fine atomization nozzle is positioned in the gas-water mixer; the double-fluid spray gun comprises a spray head 91 and a gun body 92, wherein a main channel 93 and a gas channel 94 are arranged in the gun body; the main channel is a circular channel and is positioned in the middle of the gun body; the gas channel is an annular channel and is positioned on the outer side of the main channel; the main channel is connected with the gas channel through a connecting channel 97, an impeller 95 is arranged in the main channel, the axial direction of the impeller is consistent with the direction of the main channel, a plurality of blades 96 are arranged on the impeller, and the connecting channel faces to the blades of the impeller; the impeller comprises a forward rotation impeller and a reverse rotation impeller, the forward rotation impeller and the reverse rotation impeller are arranged in the main channel at intervals, the direction of a connecting channel corresponding to the forward rotation impeller is opposite to that of a connecting channel corresponding to the reverse rotation impeller, and mixed steam blown from the forward rotation impeller and the reverse rotation impeller can blow the blades from different directions, so that the impeller has different directions of rotation; the included angle between the blades of the impeller and the axial direction of the impeller is 10-40 degrees, preferably 30 degrees, and the installation directions of the forward rotation impeller and the reverse rotation impeller are opposite, so that the desulfurization wastewater concentrated solution can be pushed to accelerate towards the same direction when the two impellers rotate; the spray head is provided with atomizing holes 98, the evaporated flue gas flows to the dust remover from the air preheater, the atomizing holes are positioned on one side of the spray head, which faces the dust remover, the spray head is spherical in shape, so that different orientations of the atomizing holes can be ensured, and the sprayed atomized desulfurization wastewater concentrated solution is prevented from being excessively concentrated to form liquid drops, which causes difficulty in evaporation; the nozzle is externally provided with a horn-shaped nozzle sheath 99 which is connected with the nozzle through threads, so that the nozzle sheath can be conveniently detached and can be replaced once the nozzle sheath is seriously corroded.
A desulfurization wastewater concentrated solution atomization anti-blocking method is characterized by comprising the following steps:
firstly, conveying the humidifying water to a gas-water mixer through a humidifying water pump to be mixed with compressed air, and enabling mixed steam to enter a gas channel of a double-fluid spray gun; simultaneously, the concentrated solution of the desulfurization wastewater enters a main channel of a double-fluid spray gun through a jet pump; the amount of humidification water is preliminarily determined by the following method:
measuring the volume flow of the flue gas, the temperature drop of the flue gas and the volume flow of the compressed air by an online instrument;
ii calculating the amount of humidifying water qm,w
qm,w=(Qv,g×ΔTg-117.91×qv,a)/15000；
Wherein Q isv,gIs the volume flow of flue gas, and the unit is m3/h；
ΔTgThe unit is the temperature drop of the flue gas;
qv,afor compressed air volume flow, in m3/h；
Secondly, after the desulfurization wastewater and the mixed steam are fully mixed in the double-fluid spray gun, the mixture is atomized and sprayed out to a drying flue through a spray head;
and thirdly, controlling the amount of humidification water by controlling the opening degree of the regulating valve, so that the temperature change amplitude of the high-temperature flue gas in the flue to be dried to dryness after the atomized liquid is dried to dryness is not more than +/-1 ℃.
When the device is used, the compressed air storage tank introduces compressed air into the gas-water mixer, the humidifying water pump sprays water mist into the gas-water mixer so as to form mixed steam and introduce the mixed steam into a gas channel of the two-fluid spray gun, and the desulfurization waste water concentrated solution in the desulfurization waste water concentrated solution storage tank is introduced into a main channel of the two-fluid spray gun through the jet pump; mixed steam enters the main channel from the gas channel through the connecting channel, and blows blades in the main channel when entering the main channel to rotate the impeller, wherein the forward rotation impeller and the reverse rotation impeller which are arranged at intervals rotate in different directions; the impeller stirs the desulfurization wastewater concentrated solution and the mixed steam in the main channel in the rotating process, so that the mixing of the desulfurization wastewater concentrated solution and the mixed steam is accelerated, and the mixing is more uniform; meanwhile, due to the inclined angle of the blades, the rotation of the impeller can drive the desulfurization wastewater concentrated solution to flow forwards, so that the desulfurization wastewater concentrated solution is accelerated, and the over-slow flow rate of the desulfurization wastewater concentrated solution at the spray head is avoided; when the atomized desulfurization wastewater concentrated solution is sprayed out from the spray head, the atomized desulfurization wastewater concentrated solution is sprayed out from different directions, so that the atomized concentrated solution is prevented from forming liquid drops in a concentrated manner; moreover, as the spray head is opposite to the air preheater, the concentrated solution just sprayed out cannot be immediately and fully contacted with high-temperature gas for drying by distillation, and the spray head sheath can also slow down the drying time of the concentrated solution at the spray head; the temperature change of the gas at the front and rear positions of the spray head can be known by measuring the temperature difference of the gas in the evaporation flue before and after passing through the spray head, and the water quantity flowing out of the humidification water pump can be controlled by the regulating valve and the flow meter, so that the temperature reduction of the gas in the evaporation flue is prevented from being too obvious; the check valve can prevent the compressed air from flowing backwards when the pressure at the humidifying water pump is lower.
Claims (4)
1. A desulfurization waste water concentrated solution atomization device is characterized by comprising a double-fluid spray gun, wherein a spray head of the double-fluid spray gun is positioned in a drying flue, two inlets of the double-fluid spray gun are respectively connected with a jet pump and a gas-water mixer, the jet pump is connected with a desulfurization waste water concentrated solution storage tank, the gas-water mixer is connected with a compressed air storage tank and a humidifying water pump, and a regulating valve is connected between the humidifying water pump and the gas-water mixer; the double-fluid spray gun comprises a spray head and a gun body, wherein a main channel and a gas channel are arranged in the gun body, the main channel is connected with the gas channel through a connecting channel, an impeller is arranged in the main channel, a plurality of blades are arranged on the impeller, and the connecting channel faces the blades of the impeller; the impeller comprises a forward rotation impeller and a reverse rotation impeller, and the forward rotation impeller and the reverse rotation impeller are arranged in the main channel at intervals; the installation directions of the forward rotation impeller and the reverse rotation impeller are opposite, so that when the two impellers rotate, the desulfurization waste water concentrated solution can be pushed to accelerate towards the same direction, the spray head is provided with an atomization hole, the evaporated flue gas flows to the dust remover from the air preheater, and the atomization hole is positioned on one side, facing the dust remover, of the spray head.
2. The concentrated solution atomizing device for desulfurization wastewater according to claim 1, wherein an included angle between the vane of the impeller and the axial direction of the impeller is 10 to 40 degrees.
3. The atomization device of claim 1, wherein a horn-shaped spray head sheath is installed outside the spray head.
4. A desulfurization waste water concentrate atomization anti-blocking method is characterized by being completed by using the desulfurization waste water concentrate atomization device of claim 1, and comprising the following steps of:
firstly, conveying the humidifying water to a gas-water mixer through a humidifying water pump to be mixed with compressed air, and enabling mixed steam to enter a gas channel of a double-fluid spray gun; simultaneously, the concentrated solution of the desulfurization wastewater enters a main channel of a double-fluid spray gun through a jet pump;
secondly, after the concentrated solution of the desulfurization waste water and the mixed steam are fully mixed in the body of the double-fluid spray gun, the concentrated solution of the desulfurization waste water and the mixed steam are atomized and sprayed out to a drying flue through a spray head;
and thirdly, controlling the amount of humidification water by controlling the opening of the regulating valve, so that the variation amplitude of the temperature of the high-temperature flue gas after the atomized liquid is evaporated to dryness is not more than +/-1 ℃.
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| CN113277585B (en) * | 2021-07-26 | 2021-11-23 | 国能龙源环保有限公司 | Low-temperature flue gas coupling dry slag waste heat treatment desulfurization wastewater system and construction method thereof |
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| CN2581056Y (en) * | 2002-11-19 | 2003-10-22 | 北京中科通用能源环保有限责任公司 | Smoke desulfurizing device for circulation fluidized bed |
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