CN109399747B - Spray gun and flue evaporation device suitable for desulfurization waste water - Google Patents
Spray gun and flue evaporation device suitable for desulfurization waste water Download PDFInfo
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- CN109399747B CN109399747B CN201811410253.0A CN201811410253A CN109399747B CN 109399747 B CN109399747 B CN 109399747B CN 201811410253 A CN201811410253 A CN 201811410253A CN 109399747 B CN109399747 B CN 109399747B
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 105
- 230000023556 desulfurization Effects 0.000 title claims abstract description 105
- 239000002351 wastewater Substances 0.000 title claims abstract description 98
- 239000007921 spray Substances 0.000 title claims abstract description 95
- 230000008020 evaporation Effects 0.000 title claims abstract description 36
- 238000001704 evaporation Methods 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 87
- 239000000428 dust Substances 0.000 claims abstract description 37
- 238000010521 absorption reaction Methods 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 29
- 238000007599 discharging Methods 0.000 claims description 20
- 229910052602 gypsum Inorganic materials 0.000 claims description 18
- 239000010440 gypsum Substances 0.000 claims description 18
- 230000003009 desulfurizing effect Effects 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 14
- 239000007790 solid phase Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 238000009825 accumulation Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 239000000243 solution Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 7
- 239000000779 smoke Substances 0.000 description 6
- 238000009692 water atomization Methods 0.000 description 6
- 238000000889 atomisation Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000002956 ash Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of spray guns and flue evaporation devices, in particular to a spray gun and a flue evaporation device suitable for desulfurization wastewater; the spray gun comprises a spray gun body; the left part of the spray gun body is respectively provided with a liquid inlet end and an air inlet end which are communicated with the cavity of the spray gun body, the bottom of the right end of the spray gun body is provided with a steam outlet end, the steam outlet end of the spray gun body is fixedly connected with a conical atomizing nozzle with a big top and a small bottom, and the outer side of the spray gun body positioned on the right of the air inlet end is fixedly connected with a sealing jacket. The invention has reasonable and compact structure and convenient use, and by the cooperation of the spray gun, the flue, the dust remover and the desulfurization absorption tower, the problems of local mud accumulation of the dust remover, easy scaling and blockage of accumulated ash at the outlet of the nozzle in the desulfurization waste water flue evaporation system caused by the existing spray gun are greatly reduced, and the invention has the characteristics of safety, reliability, good desulfurization effect and easy control of the evaporation process in the flue, thereby facilitating the operation, improving the working efficiency and reducing the production cost.
Description
Technical Field
The invention relates to the technical field of spray guns and flue evaporation devices, in particular to a spray gun and a flue evaporation device suitable for desulfurization wastewater.
Background
The power generation industry is a large household of industrial water, and along with the increasing shortage of water resources, the contradiction between supply and demand of water resources in the thermal power generation industry is more prominent. In the power structure mainly based on thermal power generation in China, especially in the areas with lack of coal and less water in the north, the lack of water becomes a primary factor for restricting the development of power. Along with the release of national energy conservation laws, environmental protection laws and corresponding water use and drainage charging policies, the method has strict index restrictions on the use, drainage and water quality of a thermal power plant. From the perspective of sustainable development, thermal power enterprises are imperative to implement water conservation and emission reduction and zero emission.
The limestone-gypsum wet desulfurization process is widely applied to coal-fired power plants in China because of the advantages of high desulfurization efficiency, high technical maturity and the like, and accounts for more than 90% of the total industrial desulfurization. The wet desulfurization process wastewater mainly comes from a gypsum dehydration system and a flushing water system, and in general, the desulfurization system process is at the tail end of a water service system of a whole plant of a thermal power unit, the water quality condition is complex, and the desulfurization system process wastewater is easily influenced by factors such as boiler combustion coal types, unit load fluctuation and the like. Therefore, the desulfurization wastewater has the characteristics of high suspended matters, high salt content, strong corrosiveness and the like, and even though the wastewater is subjected to conventional treatment, suspended matters, COD, heavy metals, chloride ions and the like are always out of standard, so that the recycling of the wastewater is influenced. With the national importance of water resources and the increasingly severe environmental protection situation, the zero emission of desulfurization wastewater has become an important factor affecting the survival and development of coal-fired power plants.
Currently, the main zero emission technologies include: the ash field/coal field spraying (easy to cause pollution), discharging into a wet slag removal system (easy acid corrosion equipment, small waste water consumption, only part of which can be utilized, and also considering the treatment of the residual waste water), evaporation in an evaporation pond (one of main flows, low system cost but large occupied area), flue atomization evaporation (one of main flows, simple process and low cost), pretreatment and evaporation crystallization (close to the main flows and high cost).
The desulfurization waste water flue evaporation process is characterized in that desulfurization waste water is sent into a flue between an air preheater and an electric dust collector, the waste water is atomized by using a nozzle, the waste water is evaporated by using flue gas, and residual solid matters after evaporation are collected by the electric dust collector together with fly ash; the existing spray gun applied to the desulfurization waste water flue evaporation system can only be mixed with part of flue gas due to the limitation of the working capacity and arrangement of the spray nozzle, so that the local flue gas humidity is overlarge, and the local mud accumulation of the dust remover can be caused by the increase of the flue gas humidity; the desulfurization wastewater contains a large amount of soluble salt, and the soluble salt forms a blockage at the outlet of the nozzle due to the fact that the nozzle is heated due to the high temperature of the flue gas; if the nozzle is not in operation, the dust is easy to accumulate and form a blockage.
Disclosure of Invention
The invention provides a spray gun and a flue evaporation device suitable for desulfurization waste water, which overcome the defects of the prior art, and can effectively solve the problem that the existing desulfurization waste water flue evaporation process needs to control the evaporation process of waste water in a flue more accurately; the existing spray gun applied to the desulfurization waste water flue evaporation system is easy to cause local mud accumulation of a dust remover, easy to form scale and form blockage at the outlet of a spray nozzle.
One of the technical schemes of the invention is realized by the following measures: a spray gun, comprising a spray gun body; the left part of the spray gun body is respectively provided with a liquid inlet end and a gas inlet end which are communicated with a cavity of the spray gun body, the bottom of the right end of the spray gun body is provided with a gas outlet end, the gas outlet end of the spray gun body is fixedly connected with a conical atomizing nozzle with a big top and a small bottom, the outer side of the spray gun body positioned on the right of the gas inlet end is fixedly connected with a sealing jacket, a jacket cavity is formed between the sealing jacket and the spray gun body, the left end of the sealing jacket is provided with a gas inlet end which is communicated with the jacket cavity, and at least four air nozzles which are communicated with the jacket cavity are symmetrically arranged on the periphery of the bottom of the right end of the sealing jacket.
The following are further optimizations and/or improvements to one of the above-described inventive solutions:
six air nozzles communicated with the jacket cavity are symmetrically arranged on the periphery of the bottom of the right end of the sealing jacket.
The included angle between the air nozzle and the central axis of the conical atomizing nozzle of the spray gun body is 10-20 degrees.
The second technical scheme of the invention is realized by the following measures: a flue evaporation device suitable for desulfurization waste water by using a spray gun comprises the spray gun, a flue, a dust remover, a desulfurization absorption tower, a waste water buffer tank, a compressed air buffer tank and a chimney; the left part outer wall of the flue is provided with spray guns symmetrically distributed along the circumference, the liquid inlet end and the air inlet end of the spray gun body are respectively positioned outside the flue, the air outlet end of the spray gun body is positioned in the flue, the air outlet end of the compressed air buffer tank is respectively connected with the air inlet end of the spray gun body through an air inlet pipe, a bypass pipe is connected between the air inlet pipe and the air inlet end of the corresponding sealing jacket, the liquid outlet end of the waste water buffer tank is respectively connected with the liquid inlet end of the spray gun body through a liquid inlet pipe, the air outlet end of the flue is connected with the air inlet end of the dust remover through a first pipeline, the air outlet end of the dust remover is connected with the air inlet end of the desulfurization absorption tower through a second pipeline, the air outlet end of the desulfurization absorption tower is connected with the air inlet end of the chimney through a third pipeline, a filtering and pressurizing device is fixedly arranged on the liquid inlet pipe, and a valve is fixedly arranged on the bypass pipe.
The following is a further optimization and/or improvement of the second technical scheme of the invention:
the outside of the desulfurization absorption tower is provided with a gypsum dehydration device and a wastewater tank; the upper part of the desulfurization absorption tower is provided with a liquid inlet end, the liquid inlet end of the desulfurization absorption tower is connected with a desulfurizing agent aqueous solution pipe, the lower part of the desulfurization absorption tower is respectively provided with a liquid outlet end and a circulating liquid outlet end, a circulating liquid feeding pipe is connected between the circulating liquid outlet end of the desulfurization absorption tower and the desulfurizing agent aqueous solution pipe, a filtering pressurizing device and a valve are respectively and fixedly arranged on the circulating liquid feeding pipe, the liquid outlet end of the desulfurization absorption tower and the feeding end of the gypsum dewatering device are connected together through a fourth pipeline, the solid phase discharge end of the gypsum dewatering device is connected with a first discharge pipe, the liquid phase discharge end of the gypsum dewatering device and the liquid inlet end of the waste water tank are connected together through a fifth pipeline, a liquid return pipe is connected between the fifth pipeline and the circulating liquid feeding pipe, and the valves are respectively and fixedly arranged on the circulating liquid outlet end and the desulfurizing agent aqueous solution pipe, and the liquid outlet end of the waste water tank and the liquid inlet end of the waste water buffer tank are connected together through a sixth pipeline.
The air inlet end of the compressed air buffer tank is connected with an air inlet pipe, a filter is fixedly installed on the air inlet pipe, and an air compressor is fixedly installed on the air inlet pipe between the filter and the compressed air buffer tank.
The air inlet pipe is fixedly provided with the regulating valve and the stop valve respectively, and the liquid inlet pipe is fixedly provided with the regulating valve and the stop valve respectively.
At least twelve spray guns are symmetrically and fixedly arranged on the outer wall of the flue along the circumference; or/and, a solid-phase discharging end is arranged at the bottom of the dust remover, a second discharging pipe is connected to the solid-phase discharging end of the dust remover, and a valve is fixedly arranged on the second discharging pipe.
The invention has reasonable and compact structure and convenient use, and by the matched use of the spray gun, the flue, the dust remover, the desulfurization absorption tower, the waste water buffer tank, the compressed air buffer tank and the chimney, the problems of local mud accumulation of the dust remover, easy scaling and dust accumulation forming blockage at the outlet of the spray nozzle in the desulfurization waste water flue evaporation system caused by the existing spray gun are greatly reduced, and the invention has the characteristics of safety, reliability, good desulfurization effect and easy control of the evaporation process in the flue, thereby facilitating the operation, improving the working efficiency and reducing the production cost.
Drawings
Fig. 1 is a schematic view of a partially perspective enlarged structure in front view of embodiment 1.
Fig. 2 is a schematic view of a partially perspective enlarged structure of a front view of the spray gun of embodiment 1, which is connected with a liquid inlet pipe and an air inlet pipe.
Fig. 3 is a schematic view showing a bottom enlarged structure at a in embodiment 1.
Fig. 4 is a schematic diagram of the enlarged right-view structure of the sealing jacket at a in example 1 with air nozzles mounted thereon.
Fig. 5 is a process flow diagram of example 2.
The codes in the drawings are respectively: 1 is a spray gun body, 2 is a conical atomizing nozzle, 3 is a sealing jacket, 4 is a jacket cavity, 5 is an air nozzle, 6 is a flue, 7 is a dust remover, 8 is a desulfurization absorption tower, 9 is a waste water buffer tank, 10 is a compressed air buffer tank, 11 is a chimney, 12 is an air inlet pipe, 13 is a bypass pipe, 14 is a liquid inlet pipe, 15 is a first pipeline, 16 is a second pipeline, 17 is a third pipeline, 18 is a filtering and pressurizing device, 19 is a valve, 20 is a gypsum dewatering device, 21 is a waste water tank, 22 is a desulfurizing agent water solution pipe, 23 is a circulating liquid upper liquid pipe, 24 is a fourth pipeline, 25 is a first discharging pipe, 26 is a fifth pipeline, 27 is a liquid return pipe, 28 is a sixth pipeline, 29 is an air inlet pipe, 30 is a filter, 31 is an air compressor, 32 is a regulating valve, 33 is a stop valve, 34 is a second discharging pipe, and alpha is an included angle.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described below with reference to examples and figures:
embodiment 1, as shown in fig. 1, 2, 3 and 4, the spray gun comprises a spray gun body 1; the left part of the spray gun body 1 is respectively provided with a liquid inlet end and an air inlet end which are communicated with a cavity of the spray gun body 1, the bottom of the right end of the spray gun body 1 is provided with a steam outlet end, the steam outlet end of the spray gun body 1 is fixedly connected with a conical atomizing nozzle 2 with a large upper part and a small lower part, the outer side of the spray gun body 1 positioned on the right of the air inlet end is fixedly connected with a sealing jacket 3, a jacket cavity 4 is formed between the sealing jacket 3 and the spray gun body 1, the left end of the sealing jacket 3 is provided with an air inlet end which is communicated with the jacket cavity 4, and at least four air nozzles 5 which are communicated with the jacket cavity 4 are symmetrically arranged on the periphery of the bottom of the right end of the sealing jacket 3. In this way, according to the principle of nozzle depressurization and acceleration, the air flow speed at the outlet of the air nozzle 5 is necessarily greater than that of the conical atomizing nozzle 2, and the air flow (essentially the air flow with impact capability, also called impact air flow) can form impact and interference on the desulfurization wastewater atomized fluid (hollow cone), so that the spraying area of the desulfurization wastewater atomized fluid is enlarged, the mixing of desulfurization wastewater atomized liquid drops and flue gas is accelerated, the breaking of the atomized liquid drops is promoted by impact, the flue gas mixing is facilitated, and the advantages of shortening the mixing time and weakening the local excessive humidity of the flue gas are achieved.
Further optimisation and/or modification of example 1 above may be carried out according to practical needs:
as shown in fig. 3, six air nozzles 5 communicating with the jacket cavity 4 are symmetrically installed on the outer circumference of the bottom of the right end of the sealing jacket 3.
As shown in fig. 4, the included angle α between the air nozzle 5 and the central axis of the conical atomizing nozzle 2 of the spray gun body 1 is 10 degrees to 20 degrees. Thus, the air sprayed by the air nozzle 5 can form impact and interference on the desulfurization waste water atomization fluid (hollow cone), so that the spraying area of the desulfurization waste water atomization fluid is enlarged, and the mixing of desulfurization waste water atomization liquid drops and flue gas is accelerated.
Example 2 as shown in fig. 1, 2, 3, 4 and 5, the evaporation device using a spray gun and suitable for a desulfurization waste water flue 6 comprises a spray gun, a flue 6, a dust remover 7, a desulfurization absorption tower 8, a waste water buffer tank 9, a compressed air buffer tank 10 and a chimney 11; the left part outer wall of the flue 6 is provided with spray guns symmetrically distributed along the circumference, the liquid inlet end and the air inlet end of the spray gun body 1 are respectively positioned outside the flue 6, the air outlet end of the spray gun body 1 is positioned in the flue 6, the air outlet end of the compressed air buffer tank 10 is respectively connected with the air inlet end of the spray gun body 1 through an air inlet pipe 12, a bypass pipe 13 is connected between the air inlet pipe 12 and the air inlet end of the corresponding sealing jacket 3, the liquid outlet end of the waste water buffer tank 9 is respectively connected with the liquid inlet end of the spray gun body 1 through a liquid inlet pipe 14, the air outlet end of the flue 6 is connected with the air inlet end of the dust remover 7 through a first pipeline 15, the air outlet end of the dust remover 7 is connected with the air inlet end of the desulfurization absorption tower 8 through a second pipeline 16, the air outlet end of the desulfurization absorption tower 8 is connected with the air inlet end of the chimney 11 through a third pipeline 17, a filtering and pressurizing device 18 is fixedly installed on the liquid inlet pipe 14, and a valve 19 is fixedly installed on the bypass pipe 13. Like this, through including spray gun, flue 6, dust remover 7, desulfurization absorption tower 8, waste water buffer tank 9, compressed air buffer tank 10 and chimney 11's cooperation use, greatly reduced the dust remover 7 local deposition that current spray gun caused in desulfurization waste water flue 6 evaporation system, easily scale deposit and deposition form the problem of jam in the nozzle export, have safe and reliable, desulfurization effectual and the evaporation process in the flue 6 easily controlled characteristics, convenient operation has improved work efficiency, reduced manufacturing cost.
Further optimisation and/or modification of example 2 above may be carried out according to practical needs:
as shown in fig. 5, a gypsum dewatering device 20 and a wastewater tank 21 are provided outside the desulfurization absorbing tower 8; the upper part of the desulfurization absorption tower 8 is provided with a liquid inlet end, the liquid inlet end of the desulfurization absorption tower 8 is connected with a desulfurizing agent water solution pipe 22, the lower part of the desulfurization absorption tower 8 is respectively provided with a liquid outlet end and a circulating liquid outlet end, a circulating liquid upper liquid pipe 23 is connected between the circulating liquid outlet end of the desulfurization absorption tower 8 and the desulfurizing agent water solution pipe 22, the circulating liquid upper liquid pipe 23 is respectively and fixedly provided with a filtering pressurizing device 18 and a valve 19, the liquid outlet end of the desulfurization absorption tower 8 and the liquid inlet end of the gypsum dewatering device 20 are connected together through a fourth pipeline 24, the solid phase discharge end of the gypsum dewatering device 20 is connected with a first discharging pipe 25, the liquid phase discharge end of the gypsum dewatering device 20 and the liquid inlet end of the waste water tank 21 are connected together through a fifth pipeline 26, a liquid return pipe 27 is connected between the fifth pipeline 26 and the circulating liquid upper liquid pipe 23, the circulating liquid upper liquid pipe 27 and the desulfurizing agent water solution pipe 22 are respectively fixedly provided with the valve 19, and the liquid outlet end of the waste water tank 21 and the liquid inlet end of the waste water buffer tank 9 are connected together through a sixth pipeline 28. Thus, the aqueous desulfurizing agent solution is injected into the aqueous desulfurizing agent solution pipe 22, and then the aqueous desulfurizing agent solution is introduced into the desulfurizing absorption tower 8 to desulfurize the flue gas. The gypsum dewatering device 20 can be a solid-liquid separation device commonly known in the art.
As shown in fig. 5, an intake pipe 29 is connected to the intake end of the compressed air buffer tank 10, a filter 30 is fixedly mounted to the intake pipe 29, and an air compressor 31 is fixedly mounted to the intake pipe 29 between the filter 30 and the compressed air buffer tank 10. Thus, the filter 30 can filter impurities in the air.
As shown in fig. 5, the intake pipe 12 is fixedly provided with a regulating valve 32 and a shutoff valve 33, and the intake pipe 14 is fixedly provided with the regulating valve 32 and the shutoff valve 33.
As shown in fig. 5, at least twelve spray guns are symmetrically and fixedly arranged on the outer wall of the flue 6 along the circumference; or/and, a solid-phase discharging end is arranged at the bottom of the dust remover 7, a second discharging pipe 34 is connected to the solid-phase discharging end of the dust remover 7, and a valve 19 is fixedly arranged on the second discharging pipe 34. In this way, according to the principle of nozzle depressurization and acceleration, the air flow speed at the outlet of the air nozzle 5 is necessarily greater than that of the conical atomizing nozzle 2, and the air flow (essentially the air flow with impact capability, also called impact air flow) can form impact and interference on the desulfurization wastewater atomized fluid (hollow cone), so that the spraying area of the desulfurization wastewater atomized fluid is enlarged, the mixing of desulfurization wastewater atomized liquid drops and flue gas is accelerated, the breaking of the atomized liquid drops is promoted by impact, the flue gas mixing is facilitated, and the advantages of shortening the mixing time and weakening the local excessive humidity of the flue gas are achieved.
Interpretation of related terms
Desulfurization waste water: the wastewater to be treated after desulfurization of the power plant contains a large amount of pollutants. The suspended substances and soluble salts have high content and weak acidity, and also contain heavy metal substances such as mercury, chromium, cadmium, lead, arsenic and the like. Meanwhile, the corrosion to metal equipment is realized;
zero emission of desulfurization wastewater: along with the importance of the nation on water resources and the increasingly severe environment protection situation, the desulfurization wastewater cannot be directly discharged into the environment, pollutants in the wastewater are solidified and separated through a series of process flows, and water is discharged to the atmosphere along with flue gas, so that zero emission is realized.
Flue 6 evaporation technique: the existing flue 6 evaporation technology adopts an atomization nozzle to atomize desulfurization wastewater, the atomized wastewater is sprayed into a flue 6 between an air preheater and an electric dust collector 7, the atomized wastewater is evaporated to dryness by using flue gas waste heat, pollutants in the wastewater are converted into crystals or salts, the crystals or salts are captured by the electric dust collector 7 along with fly ash, and the pollutants enter an ash hopper of the electric dust collector 7 and are discharged out of a system along with dry ash. The water is heated by the flue gas and evaporated into water vapor which forms part of the flue gas and is discharged together with the flue gas. The flue 6 has simple evaporation process flow and lower investment and operation cost.
Spray gun: the spray gun body 1 in the present invention may be a two-fluid atomizing spray gun, a carrier for an atomizing nozzle. The double fluid is desulfurization waste water and compressed air. The flow of the working medium is as follows: compressed air and desulfurization waste water respectively enter the spray gun from two inlets, a mixed steam chamber is arranged in the spray gun, the compressed air and the desulfurization waste water are discharged through an atomization nozzle after being mixed, and a plurality of spray guns are arranged in one system.
Atomizing nozzle: essentially a nozzle, a channel (through-flow) device utilizing the principle of depressurization and acceleration. The air and waste water mixture with certain pressure can produce the effect of reducing pressure and accelerating when flowing through the nozzle, and is sprayed out from the nozzle at a high flow rate. Because of the gas/steam mixture, atomized fluid is formed, and the outline formed by spraying is hollow cone-shaped.
Air nozzle 5: and a nozzle for individually accelerating air, wherein the air is accelerated by pressure reduction as it flows through the nozzle and flows out of the nozzle at a high speed.
Filter pressurizing device 18: the filter device and the pressurizing device can be combined, and can also be used in series.
Air compressor 31: and means for supplying compressed air to the lance.
In the invention, a 300MW unit of a certain power plant is taken as an application background in a large Tang environment company, and an operation result shows that the physical property and comprehensive utilization of the fly ash are not influenced, the calculated humidity of the flue gas is increased by 0.42%, the temperature of the flue gas is reduced by 6 ℃, and the flue gas is still in an unsaturated state and does not corrode a flue 6 and a dust remover 7; analysis of a desulfurization waste water flue 6 treatment technology is carried out by taking a certain 300MW unit as an example, and the result shows that the maximum particle size of an atomization nozzle is smaller than 109 mu m, the atomization particle size of 90% of desulfurization waste water is smaller than 90 mu m, the flue gas temperature is reduced from 144 ℃ to 140 ℃ and is higher than the acid dew point temperature by 130 ℃; the volume fraction of the water vapor in the flue gas is increased from 5.78% to 6.02%, and the flue 6 evaporation treatment scheme is adopted, so that the flue has certain water saving potential. According to the invention, a tee joint can be arranged between the air inlet pipe 12 and the bypass pipe 13, the right end of the sealing jacket 3 turns at the position of the atomizing nozzle to form a pipeline elbow, and then six air nozzles 5 communicated with the jacket cavity 4 are symmetrically arranged on the periphery of the bottom of the right end of the sealing jacket 3, and an included angle of 10-20 degrees is formed between the axial center line of each air nozzle 5 and the axial center line of the atomizing nozzle.
The beneficial effects of the invention are that
(1) The other part of the compressed air enters the jacket cavity 4 formed between the sealing jacket 3 and the spray gun body 1 through the bypass pipe 13, and the air has poor heat conduction performance and is often used as a heat insulation layer. Therefore, the air in the jacket cavity 4 can effectively weaken the heat exchange between the flue gas and the desulfurization waste water, and has a heat preservation effect on the desulfurization waste water (the heat preservation effect is to avoid the obvious temperature rise of the desulfurization waste water). Thus, the scale formation degree of the soluble salt in the desulfurization wastewater at the outlet of the conical atomizing nozzle 2 on the spray gun body 1 can be effectively reduced.
(2) Since a part of the compressed air is mixed with the desulfurization waste water in the cavity of the spray gun body 1 (the desulfurization waste water consumes a part of the air pressure), the pressure in the spray gun body 1 is lower than the pressure in the jacket cavity 4, so that the front-rear pressure difference on the air nozzle 5 is larger than that of the conical atomizing nozzle 2, and meanwhile, the flue gas heats the air, so that the air temperature is slightly increased, and the enthalpy value is increased. According to the principle of nozzle depressurization and acceleration, the air flow speed at the outlet of the air nozzle 5 is necessarily greater than that of the conical atomizing nozzle 2, and the air flow (the air flow with impact capability is actually the air flow which can be also called as the impact air flow) can form impact and interference on the desulfurization waste water atomizing fluid (hollow cone), so that the spraying area of the desulfurization waste water atomizing fluid is enlarged, the mixing of desulfurization waste water atomizing liquid drops and flue gas is accelerated, the breaking of the atomizing liquid drops can be promoted through the impact effect, the flue gas mixing is facilitated, and the advantages of shortening the mixing time and weakening the local excessive humidity of the flue gas are achieved.
The technical characteristics form the embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
The application process of the embodiment of the invention comprises the following steps: when the desulfurization device is in operation, the flue 6 of the desulfurization device is connected with a smoke outlet channel of a boiler, smoke from the boiler enters the flue 6, desulfurization waste water enters the cavity of the spray gun body 1 through the liquid inlet pipe 14, one part of compressed air enters the cavity of the spray gun body 1 through the air inlet pipe 12, the other part of compressed air enters the jacket cavity 4 formed between the sealing jacket 3 and the spray gun body 1 through the bypass pipe 13, desulfurization waste water and compressed air in the cavity of the spray gun body 1 are sprayed out by the conical atomizing nozzle 2, compressed air in the jacket cavity 4 is sprayed out by the air nozzle 5, fully mixed with smoke in the flue 6 and enters the dust remover 7, the smoke after dust removal by the dust remover 7 enters the desulfurization absorption tower 8, the smoke after desulfurization is in countercurrent contact with a desulfurizing agent water solution sprayed from the upper part, the desulfurized smoke enters the gypsum dehydration device 20 through the chimney 11, one part of desulfurized solid phase and separated desulfurization waste water enter the gypsum dehydration device 20 for solid-liquid separation, one part of the desulfurized waste water enters the desulfurization waste water enters the compression device through the liquid return pipe 27 and the circulating liquid upper pipe 23 into the jacket 8 again, the compressed air enters the buffer tank 1 through the air inlet pipe 1 and the buffer tank 1 through the air inlet pipe 14, the buffer tank 1 and the buffer tank 1, and the compressed air enters the buffer tank 1 and the buffer tank 1 through the air inlet pipe 1 and the buffer tank 2, and the compressed air buffer tank 1 is formed in sequence, and the compressed air buffer tank 1 is filled into the buffer tank 1, and the buffer tank 1 is filled with the buffer tank is filled with the compressed air.
Claims (9)
1. A spray gun is characterized by comprising a spray gun body; the left part of the spray gun body is respectively provided with a liquid inlet end and a gas inlet end which are communicated with a cavity of the spray gun body, the bottom of the right end of the spray gun body is provided with a steam outlet end, the steam outlet end of the spray gun body is fixedly connected with a conical atomizing nozzle with a big top and a small bottom, and the conical atomizing nozzle can spray desulfurization wastewater atomized fluid with a hollow conical outline; the outside of the spray gun body positioned on the right of the air inlet end is fixedly connected with a sealing jacket, a jacket cavity is formed between the sealing jacket and the spray gun body, the left end of the sealing jacket is provided with an air inlet end communicated with the jacket cavity, at least four air nozzles communicated with the jacket cavity are symmetrically arranged on the periphery of the bottom of the right end of the sealing jacket, the included angle between each air nozzle and the central shaft of the conical atomizing nozzle of the spray gun body is 10-20 degrees, and the air flow sprayed by the air nozzles can form impact and interference on the desulfurization wastewater atomizing fluid, so that the spraying area of the desulfurization wastewater atomizing fluid is enlarged, and the mixing of desulfurization wastewater atomizing liquid drops and flue gas is accelerated.
2. The spray gun according to claim 1, wherein six air nozzles communicating with the jacket cavity are symmetrically installed on the outer periphery of the bottom of the right end of the sealing jacket.
3. A flue evaporation device for desulfurization waste water using the spray gun according to claim 1 or 2, characterized by comprising a spray gun, a flue, a dust remover, a desulfurization absorption tower, a waste water buffer tank, a compressed air buffer tank and a chimney; the left part outer wall of the flue is provided with spray guns symmetrically distributed along the circumference, the liquid inlet end and the air inlet end of the spray gun body are respectively positioned outside the flue, the air outlet end of the spray gun body is positioned in the flue, the air outlet end of the compressed air buffer tank is respectively connected with the air inlet end of the spray gun body through an air inlet pipe, a bypass pipe is connected between the air inlet pipe and the air inlet end of the corresponding sealing jacket, the liquid outlet end of the waste water buffer tank is respectively connected with the liquid inlet end of the spray gun body through a liquid inlet pipe, the air outlet end of the flue is connected with the air inlet end of the dust remover through a first pipeline, the air outlet end of the dust remover is connected with the air inlet end of the desulfurization absorption tower through a second pipeline, the air outlet end of the desulfurization absorption tower is connected with the air inlet end of the chimney through a third pipeline, a filtering and pressurizing device is fixedly arranged on the liquid inlet pipe, and a valve is fixedly arranged on the bypass pipe.
4. The evaporation plant for desulfurization waste water flue according to claim 3, wherein a gypsum dehydration device and a waste water tank are arranged outside the desulfurization absorption tower; the upper part of the desulfurization absorption tower is provided with a liquid inlet end, the liquid inlet end of the desulfurization absorption tower is connected with a desulfurizing agent aqueous solution pipe, the lower part of the desulfurization absorption tower is respectively provided with a liquid outlet end and a circulating liquid outlet end, a circulating liquid feeding pipe is connected between the circulating liquid outlet end of the desulfurization absorption tower and the desulfurizing agent aqueous solution pipe, a filtering pressurizing device and a valve are respectively and fixedly arranged on the circulating liquid feeding pipe, the liquid outlet end of the desulfurization absorption tower and the feeding end of the gypsum dewatering device are connected together through a fourth pipeline, the solid phase discharge end of the gypsum dewatering device is connected with a first discharge pipe, the liquid phase discharge end of the gypsum dewatering device and the liquid inlet end of the waste water tank are connected together through a fifth pipeline, a liquid return pipe is connected between the fifth pipeline and the circulating liquid feeding pipe, and the valves are respectively and fixedly arranged on the circulating liquid outlet end and the desulfurizing agent aqueous solution pipe, and the liquid outlet end of the waste water tank and the liquid inlet end of the waste water buffer tank are connected together through a sixth pipeline.
5. The evaporation plant for desulfurization waste water flue according to claim 3 or 4, wherein an air inlet pipe is connected to an air inlet end of the compressed air buffer tank, a filter is fixedly installed on the air inlet pipe, and an air compressor is fixedly installed on the air inlet pipe between the filter and the compressed air buffer tank.
6. The evaporation device for desulfurization waste water flue according to claim 3 or 4, wherein the air inlet pipe is fixedly provided with a regulating valve and a stop valve respectively, and the liquid inlet pipe is fixedly provided with a regulating valve and a stop valve respectively.
7. The evaporation device for the desulfurization waste water flue according to claim 5, wherein the air inlet pipe is fixedly provided with a regulating valve and a stop valve respectively, and the liquid inlet pipe is fixedly provided with the regulating valve and the stop valve respectively.
8. The flue evaporation device for desulfurization waste water according to claim 3 or 4, wherein at least twelve spray guns are symmetrically and fixedly installed on the outer wall of the flue along the circumference; or/and, a solid-phase discharging end is arranged at the bottom of the dust remover, a second discharging pipe is connected to the solid-phase discharging end of the dust remover, and a valve is fixedly arranged on the second discharging pipe.
9. The evaporation plant for a desulfurization waste water flue according to claim 7, wherein at least twelve spray guns are symmetrically and fixedly installed on the outer wall of the flue along the circumference; or/and, a solid-phase discharging end is arranged at the bottom of the dust remover, a second discharging pipe is connected to the solid-phase discharging end of the dust remover, and a valve is fixedly arranged on the second discharging pipe.
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| CN110697818B (en) * | 2019-10-22 | 2021-02-09 | 武汉天空蓝环保科技有限公司 | Atomizing spray gun for flue and flue gas treatment system |
| CN110894083B (en) * | 2020-01-13 | 2020-06-09 | 山东润扬环保设备有限公司 | Improved atomizing spray gun and flue evaporation system |
| CN112547387B (en) * | 2020-12-03 | 2021-11-16 | 武汉天空蓝环保科技有限公司 | Spray gun with automatic cleaning function and desulfurization waste water zero discharge system |
| CN114956239B (en) * | 2022-06-21 | 2024-01-26 | 国家电投集团重庆合川发电有限公司 | Desulfurization waste water treatment device |
| CN117886386A (en) * | 2024-03-14 | 2024-04-16 | 南京依涛环保科技有限公司 | Single-fluid spray evaporation system for drying desulfurization wastewater concentrated solution |
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