CN117886386A - Single-fluid spray evaporation system for drying desulfurization wastewater concentrated solution - Google Patents
Single-fluid spray evaporation system for drying desulfurization wastewater concentrated solution Download PDFInfo
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- CN117886386A CN117886386A CN202410288969.7A CN202410288969A CN117886386A CN 117886386 A CN117886386 A CN 117886386A CN 202410288969 A CN202410288969 A CN 202410288969A CN 117886386 A CN117886386 A CN 117886386A
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- 238000001035 drying Methods 0.000 title claims abstract description 116
- 238000001704 evaporation Methods 0.000 title claims abstract description 107
- 239000007921 spray Substances 0.000 title claims abstract description 104
- 239000012530 fluid Substances 0.000 title claims abstract description 81
- 239000002351 wastewater Substances 0.000 title claims abstract description 77
- 230000008020 evaporation Effects 0.000 title claims abstract description 70
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 60
- 230000023556 desulfurization Effects 0.000 title claims abstract description 60
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 49
- 150000003839 salts Chemical class 0.000 claims abstract description 43
- 239000012141 concentrate Substances 0.000 claims abstract description 35
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 20
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- 239000000428 dust Substances 0.000 claims description 20
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- 238000012546 transfer Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical class [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 11
- 239000007787 solid Substances 0.000 abstract description 10
- 238000000889 atomisation Methods 0.000 abstract description 8
- 238000002425 crystallisation Methods 0.000 abstract description 8
- 230000008025 crystallization Effects 0.000 abstract description 8
- 239000002002 slurry Substances 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 5
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- 230000008901 benefit Effects 0.000 abstract description 3
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- 239000000243 solution Substances 0.000 description 26
- 230000008569 process Effects 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 230000001112 coagulating effect Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
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Abstract
The invention provides a single-fluid spray evaporation system for drying desulfurization wastewater concentrate, which comprises a deslagging filtering device, a concentrate tank, a feeding pump, a high-pressure spray pump, a single-fluid spray gun and a drying evaporation tower which are sequentially connected through a conveying pipeline; the thick liquid box is provided with a heat tracing system, and the single fluid spray gun is also connected with a fan through an air pipe; the nozzle of the single-fluid spray gun is arranged in the drying evaporation tower; the drying evaporation tower comprises an inlet end and an outlet end, the inlet end is connected with high-temperature flue gas through a flue, an adjusting air door is arranged on the flue, and a two-phase ash conveying elbow is arranged at the outlet end; the system has the advantages of simple structure, small tower body, small occupied area, stable operation of equipment and easy maintenance, avoids abrasion and corrosion of a single-fluid spray gun, avoids ash sticking on the wall of the tower, carries out ash conveying through two-phase ash conveying elbows, has strong selectivity, and avoids the insufficient flow rate of flue gas and deposition of dried ash salt at the bottoms of conveying flues and equipment by reducing the solid content of the concentrated slurry incoming water, reducing crystallization, changing a conveying system and optimizing an atomization system.
Description
Technical Field
The invention relates to the technical field of desulfurization waste water concentrated solution evaporation, in particular to a single-fluid spray evaporation system for drying desulfurization waste water concentrated solution.
Background
In the existing coal-fired power plant, the limestone-gypsum wet desulfurization process is the most used in the treatment method of the coal-fired flue gas SO 2. The water source of the method is generally wastewater which can be removed at no place after the step utilization of the wastewater of the power plant, such as chemical regeneration wastewater of a water island, circulating water sewage, reverse osmosis concentrated water and the like. The desulfurization waste water produced after desulfurization is complex in component, high in chloride ion content, and can not be reused or discharged. Even water treated by the coagulating sedimentation method generally does not meet the reuse standard and generates a large amount of chemical sludge.
The method for thoroughly solving the problem of desulfurization waste water must be changed in the existing thermal power plant. The desulfurization waste water is used as the waste water at the tail end of the whole power plant, and the problems of the waste water and the solid waste are required to be solved.
The prior desulfurization wastewater treatment process uses more concentrated treatment and then solidification treatment, and the most common and economical solidification treatment is bypass flue spray drying. However, the drying evaporation towers of the desulfurization wastewater drying and curing systems in the market at present have complex systems, huge equipment and difficult operation and maintenance; on the other hand, the conditions of incomplete drying, ash deposition in ash hoppers, abrasion of atomizing equipment and wall sticking of tower walls influence the stable operation of a drying system, mainly because:
1. The concentration of chloride ions in the desulfurization wastewater is very high (tens of thousands to hundreds of thousands mg/L after concentration), and the desulfurization wastewater has serious corrosion to various nozzles in the working environment of a drying evaporation tower at 200-400 ℃.
2. The solid content and the salt content in the desulfurization wastewater are very high, the sum of the solid content and the salt content after concentration can reach 30% or more, and the abrasion of the crystalline salt and the solid in the concentrated solution to the high-pressure thick slurry jet pump is very serious; the solid salt-containing slurry is also prone to plugging and wear inside the single fluid spray gun.
3. The salt in the concentrated solution is easy to crystallize in equipment and pipelines when being cooled in the conveying process.
4. When the nozzle is worn or the working condition of the boiler is changed, the gas quantity in the drying evaporation tower which enters the flue gas through the pressure difference is changed, so that dust sticking to the tower wall is easy to occur.
5. When the working condition of the boiler is changed, the condition that the flow rate is not fast enough when the flue gas amount in the drying evaporation tower entering the flue gas through the pressure difference is small is easy to occur, and the dried ash salt is deposited at the bottom of the conveying flue and the equipment.
In order to simplify the system, a single fluid spray gun drying evaporation tower system is adopted in the prior art, for example, the system of patent CN 216191199U is simple, the tower body is small, and the occupied area is saved. However, the concentration of chloride ions in the desulfurization wastewater is very high (tens of thousands to twenty thousands of mg/L after concentration), the salt content and the solid content are high, and the liquid phase operation pressure of the system is high and the working temperature is high, so that the conditions of equipment abrasion and ash sticking and blockage of the tower wall are also caused.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a single-fluid spray evaporation system for drying desulfurization wastewater concentrate.
In order to achieve the above purpose, the invention adopts the following technical scheme: a single-fluid spray evaporation system for drying desulfurization wastewater concentrate comprises a deslagging filtering device, a concentrate tank, a feeding pump, a high-pressure spray pump, a single-fluid spray gun and a drying evaporation tower which are sequentially connected through a conveying pipeline;
the thick liquid box is provided with a heat tracing system, the heat tracing system is connected with a water temperature controller, and the temperature acquisition end of the water temperature controller is contacted with liquid in the thick liquid box to acquire the temperature of the liquid in the thick liquid box;
The feeding pump and the high-pressure spray pump are sequentially connected in series, the front end of the feeding pump is connected with the concentrated solution tank, the rear end of the high-pressure spray pump is connected with the single-fluid spray gun, and the single-fluid spray gun is also connected with a fan through an air pipe; the nozzle of the single fluid spray gun is arranged in the drying evaporation tower;
the drying evaporation tower comprises an inlet end and an outlet end, a flow guiding device is arranged in the drying evaporation tower, the inlet end is connected with high-temperature flue gas through a flue, an adjustable air door is arranged on the flue, and a two-phase ash conveying elbow is arranged at the outlet end; the two-phase ash conveying elbow comprises a gas phase end and a solid phase end, wherein the gas phase end is connected with the dust remover through an outlet flue, and the outlet flue is provided with a switch type air door; the solid phase end is connected with a solid phase ash conveying system;
And a vibrating system is also arranged outside the drying evaporation tower.
Preferably, the two-phase ash conveying elbow comprises an elbow pipe and a straight pipe, one end of the elbow pipe is connected with the outlet end of the drying evaporation tower, the other end of the elbow pipe is connected with the outlet flue, the elbow pipe is communicated with the straight pipe in a crossing manner, the straight pipe is vertically arranged, the straight pipe is located under the outlet end of the drying evaporation tower, and the lower end of the straight pipe is connected with the solid-phase ash conveying system.
Preferably, the drying and evaporating tower comprises an inlet chamber, a tower body and an outlet chamber, wherein the inlet chamber is positioned above the tower body, the inlet chamber is connected with the flue, a flow guiding device is arranged in the inlet chamber, the outlet chamber is arranged below the tower body, the two-phase ash conveying elbow is arranged below the outlet chamber, the outlet chamber comprises a cone section, the rapping system comprises a rapper, and the rapper is arranged below the middle of the tower body and the cone section of the outlet chamber.
Preferably, the single fluid spray gun is radially introduced into the tower body of the drying and evaporating tower, the single fluid spray gun is positioned at the upper part of the tower body, and the nozzle of the single fluid spray gun is arranged at the center of the drying and evaporating tower.
Preferably, the flow rate of the high-temperature flue gas in the tower body is 0.8-1.1 m/S, and the residence time of the wastewater after the wastewater contacts the high-temperature flue gas is not less than 10S.
Preferably, the single fluid gun is made of wear resistant materials including 2205, 316L, ceramic, diamond.
Preferably, the temperature of the desulfurization wastewater concentrate in the concentrate tank is kept between 63 and 66 ℃; and the rapping of the rapping system is continuously kept for 5-10 min to perform rapping once.
Preferably, the high-temperature flue gas is denitration high-temperature flue gas, and the temperature of the high-temperature flue gas is 280-430 ℃.
Preferably, the working principle of the system specifically comprises: the concentrated desulfurization wastewater is pre-filtered by a deslagging and filtering device, stored in a concentrated solution tank, pressurized and conveyed to a single-fluid spray gun by a feeding pump and a high-pressure spray pump sequentially through a conveying pipeline, atomized in a drying and evaporating tower, high-temperature flue gas enters the drying and evaporating tower, subjected to flow equalization by a flow guiding device, contacted with atomized high-salt concentrated wastewater fog drops, and subjected to heat transfer to evaporate water, wherein the residence time in the drying and evaporating tower is more than 10S; and finally, conveying the water vapor and the light ash salt together with the flue gas to a dust remover of a power plant from a gas phase end of a drying evaporation tower, and conveying the ash salt with large mass and large particles to an ash warehouse from a solid-phase ash conveying system at a solid-phase end.
Preferably, the method comprises the following working steps:
s1: pre-filtering; operating a deslagging filtering device, and receiving desulfurization wastewater from a concentration system at any time and carrying out deslagging filtering;
S2: storing waste liquid; the pre-filtered desulfurization wastewater is conveyed to a concentrate tank through a conveying pipeline, and a heat tracing system of the concentrate tank runs for a long time, so that the temperature of the desulfurization wastewater in the concentrate tank is kept at 65 ℃;
S3: preheating a drying evaporation tower; opening an adjusting type air door of a flue and a switching type air door of an outlet flue, and preheating a drying and evaporating tower to ensure that the temperature inside the drying and evaporating tower is not lower than 280 ℃;
S4: running a system; operating a rapping system to perform rapping once every 5-10 min; operating a solid-phase ash conveying system and a fan; starting a feeding pump and a high-pressure spray pump in sequence;
S5: regulating the system throughput; according to the working condition of the boiler, the concentrated solution treatment capacity of the drying evaporation tower and the smoke temperature at the outlet of the drying evaporation tower, an air inlet quantity is regulated by regulating a regulating air door, and the system is continuously operated to treat desulfurization wastewater;
S6: the desulfurization wastewater treatment is completed, and the system is closed; the high-pressure spray pump, the feeding pump, the fan, the solid-phase ash conveying system, the vibrating system, the flue adjusting type air door and the outlet flue opening and closing type air door are sequentially closed.
Compared with the prior art, the invention has the beneficial effects that: (1) According to the invention, by designing a new complete process system, the system avoids the problem of poor corrosion and abrasion resistance effects of a single fluid spray gun made of corrosion-resistant materials under the conventional operation working condition by reducing the solid content of concentrated slurry to water, reducing crystallization, changing a conveying system and optimizing an atomization system, prolongs the service life of the system, solves the problem that the concentration of chloride ions in desulfurization wastewater is very high (up to tens of thousands of mg/L after concentration), and has serious corrosion on various nozzles in the working environment of a drying evaporation tower at 200-400 ℃, and ensures that the system can be combined with any concentration process and can treat high-concentration mixed brine; (2) The invention redesigns on the basis of the existing single-fluid spray gun drying evaporation tower, has simple system structure, small tower body, land occupation and cost saving, and stable equipment operation and easy maintenance. (3) The addition of the protection wind to the single fluid spray gun in the system has the following effects: firstly, cooling concentrated solution in the single fluid spray gun in a protection cavity of the single fluid spray gun, preventing the concentrated solution from crystallizing in the single fluid spray gun due to overhigh temperature, and reducing abrasion of crystals to a spray nozzle; secondly, forming a gas film between the waste water at the moment of spraying at the nozzle and the outer wall of the single-fluid spray gun, and reducing the contact between the waste water and the single-fluid spray gun; thirdly, an air curtain is arranged outside the fog cone at the moment of spraying the single-fluid spray gun, so that a certain shrinkage effect is achieved on the atomization angle, the risk of spraying the single-fluid spray gun to the tower wall is reduced, and the ash sticking on the tower wall is avoided. (4) The drying evaporation tower of the system is provided with two-phase ash conveying elbows, and ash salt with light weight and small particles is carried along with the flue gas and enters the flue to be sent to the dust remover of the power plant; the ash salt with larger mass and larger particles can enter the solid-phase ash conveying system preferentially due to inertia, wherein the ash salt can be a bin pump ash conveying system or other systems, and the ash salt is generally conveyed to the front of the dust remover. The two-phase conveying has the advantages that the risk of blockage of an outlet chamber and an outlet flue of the drying and evaporating tower is avoided, the selectivity of an ash conveying terminal is high, and the situation that when the working condition of a boiler is changed, the flow rate is not fast enough when the amount of smoke in the drying and evaporating tower entering smoke through pressure difference is small, and the dried ash salt is deposited at the bottoms of the conveying flue and equipment is avoided; (5) The system ensures that the angle of the single-fluid spray gun is kept stable through the single-fluid spray gun entering at a radial angle, avoids changing the atomization angle, reduces the possibility of droplet drifting by arranging the nozzle at the center of the drying and evaporating tower, ensures that spray substances are more concentrated in a preset area of the tower, and avoids dust dipping caused by the fact that mist droplets touch the inner wall of the drying and evaporating tower. Meanwhile, atomized liquid drops can be widely spread in a gas flow path, so that the surface area of gas-liquid contact is maximized, and the treatment efficiency of the system is improved; (6) The system is provided with a rapping system, the rapping system comprises a rapper, the rapper is arranged at the middle lower part of the tower body and the conical section of the outlet chamber, and the design of the conical section ensures that ash and salt falling into the outlet chamber can be collected at the outlet end, so that ash can be conveyed through the two-phase ash conveying elbow. Through the rapping system, when the boiler working condition changes, the flue gas amount in the drying evaporation tower which enters the flue gas through the pressure difference changes, the risk of sticking to the wall exists, and once a small amount of dust is stained on the wall of the tower, the flue gas can be rapped. Through the installation of the vibrator at the cone section, on the one hand, the ash salt adhered to the inner wall of the outlet chamber can be peeled off, on the other hand, the aggregation of the ash salt can be quickened, the ash salt can be discharged from the outlet end, and the blockage of the outlet chamber and the outlet flue of the drying evaporation tower is avoided. After the tower wall is stained with ash, the tower wall does not need manual cleaning, can be cleaned automatically, and does not influence the stable operation of the system.
Drawings
FIG. 1 is a schematic diagram of a single fluid spray evaporation system for drying desulfurization wastewater concentrate according to the present invention.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the invention, reference should be made to the following detailed description of the preferred embodiments.
A single-fluid spray evaporation system for drying desulfurization wastewater concentrate comprises a deslagging filtering device 1, a concentrate tank 2, a feeding pump 4, a high-pressure spray pump 5, a single-fluid spray gun 6 and a drying evaporation tower 9 which are sequentially connected through a conveying pipeline; and the desulfurization waste liquid is conveniently and sequentially conveyed and finally evaporated in the drying evaporation tower 9.
The thick liquid box 2 is provided with a heat tracing system, the heat tracing system is connected with a water temperature controller 3, and the temperature acquisition end of the water temperature controller 3 is contacted with liquid in the thick liquid box 2 to acquire the temperature of the liquid in the thick liquid box 2; the water temperature in the concentrate tank 2 is kept at about 65 ℃ by the water temperature controller 3. The heat tracing system can carry out heat tracing through steam heat tracing, electric heat tracing and hot smoke, and does not limit the types. When the concentration multiple of the desulfurization wastewater reaches 10-20, the salt content in the concentrated solution is very high, and crystallization is easy. The temperature of the liquid in the concentrate tank is guaranteed to be about 65 ℃ through heat tracing, and the concentrate is prevented from crystallizing in the concentrate tank.
The feeding pump 4 and the high-pressure spray pump 5 are sequentially connected in series, the front end of the feeding pump 4 is connected with the concentrated solution tank 2, and the rear end of the high-pressure spray pump 5 is connected with the single-fluid spray gun 6. The high-pressure spray pump 5 can be modified by a high-pressure pump on the market, a replaceable diaphragm is installed, the front part is connected with a feed pump in series, the diaphragm is prevented from bearing too large negative pressure, and the diaphragm can be replaced easily at regular intervals.
The single-fluid spray gun 6 is also connected with a fan 14 through an air pipe; the nozzle of the single fluid spray gun 6 is arranged in the drying evaporation tower 9; air is extracted through the fan 14 to provide protection air for the single fluid spray gun 6, the protection air is sent into the protection cavity of the single fluid spray gun 6, and finally the protection air is sprayed out from the nozzle and enters the tower. The addition of the protection wind to the system has 3 major effects: firstly, cooling the concentrated solution in the single fluid spray gun 6 in a protection cavity of the single fluid spray gun, preventing the concentrated solution from crystallizing in the single fluid spray gun 6 due to overhigh temperature, and reducing the abrasion of crystals to a spray nozzle; secondly, a gas film is formed between the waste water at the moment of spraying at the nozzle and the outer wall of the single-fluid spray gun 6, so that the contact between the waste water and the single-fluid spray gun is reduced; thirdly, an air curtain is arranged outside the fog cone at the moment of spraying the single-fluid spray gun 6, so that a certain shrinkage effect is achieved on the atomization angle, the risk of spraying the single-fluid spray gun to the tower wall is reduced, and the ash sticking on the tower wall is avoided.
The drying and evaporating tower 9 comprises an inlet end and an outlet end, a flow guiding device is arranged in the drying and evaporating tower, the inlet end is connected with high-temperature flue gas 7 through a flue, an adjustable air door 8 is arranged on the flue, and the air inlet quantity can be automatically adjusted by combining the working condition of a boiler, the concentrated solution treatment capacity of the drying and evaporating tower and the outlet flue temperature of the drying and evaporating tower when the working condition is changed, so that stable operation is ensured. The outlet end is provided with a two-phase ash conveying elbow 10; the two-phase ash conveying elbow 10 comprises a gas phase end and a solid phase end, wherein the gas phase end is connected with a dust remover 13 through an outlet flue, and a switch type air door 12 is arranged on the outlet flue; the solid phase end is connected with a solid phase ash conveying system 11; through the two-phase ash conveying elbow 10, ash salt with light weight and small particles is carried along with the flue gas and enters the flue together to be sent to the power plant dust remover 13; the ash salt with larger mass and larger particles can enter the solid-phase ash conveying system 11 preferentially due to inertia, wherein the ash salt can be a bin pump ash conveying system or other systems, and the ash salt is generally sent to the front of the dust remover. The advantage of two-phase transport is that the risk of clogging of the outlet chamber and outlet flue of the drying and evaporating tower is avoided.
A rapping system 15 is also arranged outside the drying and evaporating tower 9. To prevent sticking of the wall inside the tower, the wall is once stuck and then is knocked off. Preventing the inner wall of the drying and evaporating tower 9 from being stained with dust.
The two-phase ash conveying elbow 10 comprises an elbow pipe 101 and a straight pipe 102, one end of the elbow pipe 101 is connected with the outlet end of the drying and evaporating tower 9, the other end of the elbow pipe 101 is connected with the outlet flue, the elbow pipe 101 is in cross communication with the straight pipe 102, the straight pipe 102 is vertically arranged, the straight pipe 102 is located right below the outlet end of the drying and evaporating tower 9, and the lower end of the straight pipe 102 is connected with the solid-phase ash conveying system 11. The ash salt with larger mass or larger particles in the use process can be ensured to enter the solid-phase ash conveying system 11 preferentially due to inertia, lighter and smaller ash salt can enter a flue through the bent pipe 101 along with flue gas, and the lighter and smaller ash salt is sent into a dust remover for flue gas dust removal, so that the selectivity of an ash conveying terminal is stronger.
The drying and evaporating tower 9 comprises an inlet chamber 91, a tower body 92 and an outlet chamber 93, wherein the inlet chamber 91 is positioned above the tower body 92, the inlet chamber 91 is connected with the flue, a flow guiding device is arranged in the inlet chamber 91 and can be used for equalizing flow of high-temperature flue gas, full contact between the high-temperature flue gas and mist drops of wastewater is guaranteed, full heat transfer and drying between the high-temperature flue gas and the mist drops are guaranteed, the efficiency of a system is improved, flow equalizing device can reduce the flow resistance of gas in the tower, pressure drop is reduced, energy consumption is reduced, and long-term stable operation of the system is guaranteed. The outlet chamber 93 is arranged below the tower body 92, the two-phase ash conveying elbow 10 is arranged below the outlet chamber 93, the outlet chamber 93 comprises a cone section, and the rapping system 15 comprises a rapper which is arranged below and in the tower body 92 and in the cone section of the outlet chamber 63. The cone section ensures that the ash salt falling into the outlet chamber can be collected at the outlet end, so that ash can be conveyed through the two-phase ash conveying elbow. Through the rapping system, when the boiler operating mode changes, the flue gas amount in the drying and evaporating tower 9 which enters the flue gas through the pressure difference changes, the risk of sticking to the wall exists, and once a small amount of dust is stuck to the wall of the tower, the dust is rapped. Through the installation of the vibrator at the cone section, on the one hand, the ash salt adhered to the inner wall of the outlet chamber can be peeled off, on the other hand, the aggregation of the ash salt can be quickened, the ash salt can be discharged from the outlet end, and the blockage of the outlet chamber and the outlet flue of the drying evaporation tower 9 is avoided.
The single fluid spray gun 6 radially enters the tower body of the drying and evaporating tower, the single fluid spray gun 6 is positioned at the upper part of the tower body 92, and the nozzle of the single fluid spray gun 6 is arranged at the center of the drying and evaporating tower 9. The nozzle is arranged downward. The angle of the single-fluid spray gun 6 entering through the radial angle is ensured to be kept stable, the change of the atomization angle is avoided, the nozzle is positioned at the center of the drying and evaporating tower 9, the possibility of liquid drop drifting is reduced, the spray substances are ensured to be concentrated in a preset area of the tower, and dust is prevented from being stained due to the fact that mist drops touch the inner wall of the drying and evaporating tower. Meanwhile, atomized liquid drops can be widely spread in a gas flow path, so that the surface area of gas-liquid contact is maximized, and the treatment efficiency of the system is improved.
The flow rate of the high-temperature flue gas in the tower body 92 is 0.8-1.1 m/S, and the residence time of the wastewater after the wastewater contacts the high-temperature flue gas is not less than 10S. By means of which the wall can be effectively released and complete drying can be ensured. Generally, the material is completely dried in 5-6 s; through guaranteeing the contact of waste water droplet and high temperature flue gas for a long time, ensure that the atomizing droplet is dry completely, when avoiding the operating mode to change, can not in time adjust the flow of high temperature flue gas in the system, lead to failing to fully dry, avoid ash salt to occupy the ratio and export to block up, be applicable to the condition of handling the operating mode and change.
The single fluid spray gun 6 is made of wear-resistant materials including 2205, 316L, ceramics and diamond. When the device is used, the materials of the single-fluid spray gun 6 are innovated, different materials can be adopted at different positions, the abrasion bearing capacity of the single-fluid spray gun 6 is improved, the abrasion of the single-fluid spray gun 6 in a system is avoided, the poor atomization of wastewater is caused, the change of the atomization angle is avoided, the ash dipping of the tower wall is avoided, and finally the long-term stable operation of the drying evaporation tower is ensured.
The temperature of the desulfurization wastewater concentrated solution in the concentrated solution tank 2 is kept at 63-66 ℃; the temperature of the liquid in the concentrate tank is guaranteed to be about 65 ℃, and the concentrate is prevented from crystallizing in the concentrate tank. The rapping of the rapping system 15 is continuously maintained for 5-10 min for one rapping. By the rapping of the rapping system 15, it is ensured that a small amount of ash is present on the tower wall, which is rapped off, and that a long-term continuous rapping helps to loosen the ash salts, prevent the ash salts from accumulating in the pipes or equipment, thereby improving the flowability of the system, preventing the ash salts from accumulating at the outlet end, reducing the risk of clogging the outlet chamber 93 and the outlet flue of the drying and evaporation tower 9.
The high-temperature flue gas 7 is denitrated high-temperature flue gas, and the temperature of the high-temperature flue gas 7 is 280-430 ℃. Ensure that high temperature flue gas has sufficient heat and provides the heat for atomizing liquid drop, guarantee that desulfurization waste water can fully dry, avoid drying incompletely, ash salt bonding leads to the system to block up, utilize the denitration to carry out the evaporation drying to desulfurization waste water to the heat in the high temperature flue gas simultaneously, make full use of denitration flue gas's waste heat reduces the energy extravagant, reduces the energy cost, reduces the greenhouse gas emission that the burning fuel produced, and low-carbon operation accords with sustainable development's target.
A single-fluid spray evaporation system for drying desulfurization wastewater concentrate comprises the following working steps:
S1: pre-filtering; operating the deslagging filtering device 1, receiving desulfurization wastewater from the concentration system at any time and carrying out deslagging filtering; the deslagging and filtering device 1 can be composed of a spiral screen driven by a low-speed motor, can automatically discharge dry slag while filtering, pretreat original large particles in concentrated solution and crystals generated by long-distance conveying, and protect the whole set of system. The abrasion of crystallization or particle impurities to the system is reduced, and the service life of the system is prolonged.
S2: storing waste liquid; the pre-filtered desulfurization wastewater is conveyed to a concentrated solution tank 2 through a conveying pipeline, and a heat tracing system of the concentrated solution tank 2 runs for a long time, so that the temperature of the desulfurization wastewater in the concentrated solution tank 2 is kept at 65 ℃; the long-term operation of the heat tracing system ensures the temperature in the concentrated solution tank 2, avoids crystallization in the concentrated solution tank 2, and causes serious abrasion of the high-pressure concentrated slurry jet pump by the crystallization salt and solids in the concentrated solution; the solid salt-containing slurry is prevented from being blocked and frayed inside the single fluid spray gun.
S3: preheating a drying evaporation tower; opening a regulating type air door of a flue and a switching type air door of an outlet flue, and preheating a drying and evaporating tower 9, so that the temperature inside the drying and evaporating tower 9 is not lower than 280 ℃; through advance preheat in the tower, guarantee that the temperature in the tower can provide heat for atomizing liquid drop, ensure that waste water can be fully dried, can't reach the temperature requirement before avoiding the system operation, lead to ash salt caking to block up the export, simultaneously, through the waste heat of high temperature flue gas, the inspection is unobstructed and ensure the system, guarantees system normal operating, avoids blocking up.
S4: running a system; operating the rapping system 15 to perform rapping once every 5-10 min; operating the solid-phase ash conveying system 11 and the fan 14; and sequentially starting the feeding pump 4 and the high-pressure spray pump 5; the whole system is operated by the opening device, so that desulfurization waste water can be conveyed into the drying evaporation tower 9 for drying, and the normal operation of the system is ensured.
S5: regulating the system throughput; according to the working condition of the boiler, the concentrated solution treatment capacity of the drying evaporation tower and the smoke temperature at the outlet of the drying evaporation tower, the air inlet quantity is regulated by regulating the regulating type air door 8, the system is continuously operated, and the desulfurization wastewater is treated; by adjusting the air inlet quantity, the system can be applied to different working conditions, and the adaptability of the system is improved.
S6: the desulfurization wastewater treatment is completed, and the system is closed; the high-pressure spray pump 5, the feeding pump 4, the fan 14, the solid-phase ash conveying system 11, the rapping system 15, the adjustable air door 8 of the flue and the switch-type air door 12 of the outlet flue are closed in sequence. The heat tracing system and the deslagging filtering device are not closed, so that the deslagging filtering device can receive wastewater at any time, crystallization in the concentrate tank is avoided, and normal operation of the system is ensured. By sequentially closing the devices in the system, residual desulfurization waste water in the single fluid spray gun 6 is avoided, so that crystallization occurs in the single fluid spray gun 6, and blockage is caused, or the single fluid spray gun is damaged and worn. And finally, closing the adjusting air door 8 and the switch air door 12, so as to ensure that the temperature in the tower body can reach the drying temperature, dry the residual wastewater, ensure the drying to be complete and avoid the adhesion of the tower body or the residual ash salt used last time when the tower body is reused.
The working principle of the system specifically comprises the following steps: the concentrated desulfurization wastewater is pre-filtered by a deslagging filtering device 1, stored in a concentrated solution tank 2, pressurized and conveyed to a single-fluid spray gun 6 by a feeding pump 4 and a high-pressure spray pump 5 in sequence through a conveying pipeline, atomized in a drying evaporation tower 9, high-temperature flue gas 7 enters the drying evaporation tower 9, subjected to flow equalization by a flow guide device, contacted with atomized high-salt concentrated wastewater mist drops, and subjected to heat transfer to evaporate water, wherein the residence time in the drying evaporation tower 9 is more than 10 seconds; finally, the water vapor and the light ash salt are sent to a dust remover 13 of the power plant along with the flue gas from the gas phase end of the drying and evaporating tower 9, and the large-mass and large-particle ash salt is sent to an ash warehouse or a front flue of the dust remover from a solid-phase ash conveying system 11 at the solid phase end.
The drying system can be combined with any concentration process, the concentration multiple can be 1-20 times, the maximum chloride ion content can reach 200000mg/L, the maximum solid content and salt content can reach 50%, the salt content is very high, and the salt is high-concentration hetero-salt water. The throughput of the whole system is non-standard customized according to actual projects, and is generally 1-5 m 3/h.
The invention has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A single fluid spray evaporation system for drying desulfurization wastewater concentrate, characterized in that: comprises a deslagging filtering device, a concentrated solution tank, a feeding pump, a high-pressure spray pump, a single fluid spray gun and a drying evaporation tower which are sequentially connected through a conveying pipeline;
the thick liquid box is provided with a heat tracing system, the heat tracing system is connected with a water temperature controller, and the temperature acquisition end of the water temperature controller is contacted with liquid in the thick liquid box to acquire the temperature of the liquid in the thick liquid box;
The feeding pump and the high-pressure spray pump are sequentially connected in series, the front end of the feeding pump is connected with the concentrated solution tank, the rear end of the high-pressure spray pump is connected with the single-fluid spray gun, and the single-fluid spray gun is also connected with a fan through an air pipe; the nozzle of the single fluid spray gun is arranged in the drying evaporation tower;
the drying evaporation tower comprises an inlet end and an outlet end, a flow guiding device is arranged in the drying evaporation tower, the inlet end is connected with high-temperature flue gas through a flue, an adjustable air door is arranged on the flue, and a two-phase ash conveying elbow is arranged at the outlet end; the two-phase ash conveying elbow comprises a gas phase end and a solid phase end, wherein the gas phase end is connected with the dust remover through an outlet flue, and the outlet flue is provided with a switch type air door; the solid phase end is connected with a solid phase ash conveying system;
And a vibrating system is also arranged outside the drying evaporation tower.
2. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the two-phase ash conveying elbow comprises an elbow pipe and a straight pipe, one end of the elbow pipe is connected with the outlet end of the drying evaporation tower, the other end of the elbow pipe is connected with the outlet flue, the elbow pipe is communicated with the straight pipe in a crossing mode, the straight pipe is vertically arranged, the straight pipe is located right below the outlet end of the drying evaporation tower, and the lower end of the straight pipe is connected with the solid-phase ash conveying system.
3. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the drying evaporation tower comprises an inlet chamber, a tower body and an outlet chamber, wherein the inlet chamber is positioned above the tower body, the inlet chamber is connected with the flue, a flow guiding device is arranged in the inlet chamber, the outlet chamber is arranged below the tower body, the two-phase ash conveying elbow is arranged below the outlet chamber, the outlet chamber comprises a cone section, the rapping system comprises a rapping device, and the rapping device is arranged in the cone section of the middle lower part of the tower body and the cone section of the outlet chamber.
4. A single fluid spray evaporation system for drying desulfurization wastewater concentrate as defined in claim 3, wherein: the single fluid spray gun radially enters the tower body of the drying and evaporating tower, the single fluid spray gun is positioned at the upper part of the tower body, and the nozzle of the single fluid spray gun is arranged at the center of the drying and evaporating tower.
5. A single fluid spray evaporation system for drying desulfurization wastewater concentrate as defined in claim 3, wherein: the flow rate of the high-temperature flue gas in the tower body is 0.8-1.1 m/S, and the residence time of the wastewater after the wastewater contacts the high-temperature flue gas is not less than 10S.
6. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the single fluid spray gun is made of wear-resistant materials, including 2205, 316L, ceramics and diamonds.
7. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the temperature of the desulfurization wastewater concentrated solution in the concentrated solution box is kept at 63-66 ℃; and the rapping of the rapping system is continuously kept for 5-10 min to perform rapping once.
8. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the high-temperature flue gas is denitrated high-temperature flue gas, and the temperature of the high-temperature flue gas is 280-430 ℃.
9. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 1, wherein: the working principle of the system is that the concentrated desulfurization wastewater is pre-filtered by a deslagging and filtering device and then stored in a concentrated solution tank, the concentrated desulfurization wastewater is pressurized and conveyed to a single-fluid spray gun by a feeding pump and a high-pressure spray pump in sequence through a conveying pipeline, atomized in a drying and evaporating tower, high-temperature flue gas enters the drying and evaporating tower, and the high-temperature flue gas is subjected to flow equalization by a flow guide device and then contacts with atomized high-salt concentrated wastewater mist drops, so that the water is evaporated through heat transfer, and the residence time in the drying and evaporating tower is more than 10S; and finally, conveying the water vapor and the light ash salt together with the flue gas to a dust remover of a power plant from a gas phase end of a drying evaporation tower, and conveying the ash salt with large mass and large particles to an ash warehouse from a solid-phase ash conveying system at a solid-phase end.
10. The single fluid spray evaporation system for drying desulfurization wastewater concentrate according to claim 9, wherein: the method specifically comprises the following working steps:
s1: pre-filtering; operating a deslagging filtering device, and receiving desulfurization wastewater from a concentration system at any time and carrying out deslagging filtering;
S2: storing waste liquid; the pre-filtered desulfurization wastewater is conveyed to a concentrate tank through a conveying pipeline, and a heat tracing system of the concentrate tank runs for a long time, so that the temperature of the desulfurization wastewater in the concentrate tank is kept at 65 ℃;
S3: preheating a drying evaporation tower; opening an adjusting type air door of a flue and a switching type air door of an outlet flue, and preheating a drying and evaporating tower to ensure that the temperature inside the drying and evaporating tower is not lower than 280 ℃;
S4: running a system; operating a rapping system to perform rapping once every 5-10 min; operating a solid-phase ash conveying system and a fan; starting a feeding pump and a high-pressure spray pump in sequence;
S5: regulating the system throughput; according to the working condition of the boiler, the concentrated solution treatment capacity of the drying evaporation tower and the smoke temperature at the outlet of the drying evaporation tower, an air inlet quantity is regulated by regulating a regulating air door, and the system is continuously operated to treat desulfurization wastewater;
S6: the desulfurization wastewater treatment is completed, and the system is closed; the high-pressure spray pump, the feeding pump, the fan, the solid-phase ash conveying system, the vibrating system, the flue adjusting type air door and the outlet flue opening and closing type air door are sequentially closed.
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