CN112479293A - Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower - Google Patents

Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower Download PDF

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Publication number
CN112479293A
CN112479293A CN202011248462.7A CN202011248462A CN112479293A CN 112479293 A CN112479293 A CN 112479293A CN 202011248462 A CN202011248462 A CN 202011248462A CN 112479293 A CN112479293 A CN 112479293A
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China
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flue gas
semi
waste water
desulfurization tower
dry desulfurization
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CN202011248462.7A
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Chinese (zh)
Inventor
吴火强
强雪妮
毛进
连坤宙
胡阳阳
王璟
李文涛
张雯
刘亚鹏
高亚楠
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Xian TPRI Water Management and Environmental Protection Co Ltd
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Xian TPRI Water Management and Environmental Protection Co Ltd
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Priority to CN202011248462.7A priority Critical patent/CN112479293A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/10Treatment 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
    • C02F1/12Spray evaporation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80Semi-solid phase processes, i.e. by using slurries
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/043Details
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048Purification of waste water by evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/16Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a waste water and flue gas waste heat drying system and method based on a semi-dry desulfurization tower, which comprises a semi-dry desulfurization tower, a compressed air main pipe and a filtered desulfurization waste water main pipe, wherein the semi-dry desulfurization tower comprises a semi-dry desulfurization tower body and a plurality of double-fluid atomizing nozzles arranged in the semi-dry desulfurization tower body, the compressed air main pipe is communicated with a compressed air inlet of each double-fluid atomizing nozzle, the filtered desulfurization waste water main pipe is communicated with a desulfurization waste water inlet of each double-fluid atomizing nozzle, each double-fluid atomizing nozzle is uniformly distributed along the circumferential direction, the bottom of the semi-dry desulfurization tower body is provided with a flue gas inlet, the top of the semi-dry desulfurization tower body is provided with a flue gas outlet, and the system and method are based on the flue characteristics of the semi-dry desulfurization tower, can fully utilize the waste heat of the flue gas after an air preheater to realize the complete evaporation of the desulfurization waste, has the characteristics of low investment and reconstruction cost and low operation cost.

Description

Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower
Technical Field
The invention belongs to the technical field of zero emission of desulfurization wastewater, and relates to a wastewater and flue gas waste heat drying system and method based on a semi-dry desulfurization tower.
Background
Because the content of scale-causing ions such as calcium, magnesium and the like in the desulfurization wastewater is high, evaporation crystallization operation can be performed after softening treatment is performed on the desulfurization wastewater by adopting a large amount of reagents, and the reagent cost and the operation energy consumption are high, so that in recent years, the bypass flue gas evaporation drying tower technology for evaporating the desulfurization wastewater is applied more by extracting high-temperature flue gas after denitration and in front of an air preheater. However, the technology can cause certain influence on the boiler efficiency and coal consumption of the unit by extracting high-temperature flue gas in front of the air preheater. Therefore, researchers provide a scheme for evaporating and drying the desulfurization wastewater by using the residual heat of the flue gas behind the air preheater, the scheme is mainly limited by the conditions of flue arrangement, length and the like by spraying the desulfurization wastewater into the flue in front of the air preheater and the electric dust remover and realizing evaporation and drying under the action of the residual heat of the flue gas, the condition that the desulfurization wastewater is incompletely evaporated to dryness and adheres to the wall of the flue is easy to occur, and certain risks are brought to the safe operation of a unit.
The semidry desulfurization process is a desulfurization mode that absorbent slurry is atomized and sprayed into an absorption tower by utilizing a spray drying principle, the absorbent reacts with sulfur dioxide in flue gas in the absorption tower, heat in the flue gas is absorbed to evaporate and dry water in the absorbent, and waste residue after desulfurization reaction is discharged in a dry state. However, some semi-dry desulfurization towers of power plants have poor operation effect after operation, the power plants abandon the system, and the original semi-dry desulfurization tower is only used as a flue. However, the semi-dry desulfurization tower body is higher, the diameter is moderate, the internal flue gas flow field is smoother, the flue characteristics based on the original semi-dry desulfurization tower can be considered for transformation, and a set of waste water flue gas waste heat drying system and method are designed, can fully utilize the flue gas waste heat after the air preheater to realize the complete evaporation of the desulfurization waste water, and cannot generate the adherence phenomenon; the transformation scheme has the characteristics of low investment transformation cost and low operation cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for drying waste water and flue gas waste heat based on a semi-dry desulfurization tower.
In order to achieve the purpose, the waste water and flue gas waste heat drying system based on the semi-dry desulfurization tower comprises the semi-dry desulfurization tower, a compressed air main pipe and a filtered desulfurization waste water main pipe, wherein the semi-dry desulfurization tower comprises a semi-dry desulfurization tower body and a plurality of double-fluid atomizing nozzles arranged in the semi-dry desulfurization tower body, the compressed air main pipe is communicated with a compressed air inlet of each double-fluid atomizing nozzle, the filtered desulfurization waste water main pipe is communicated with a desulfurization waste water inlet of each double-fluid atomizing nozzle, the double-fluid atomizing nozzles are uniformly distributed along the circumferential direction, a flue gas inlet is formed in the bottom of the semi-dry desulfurization tower body, and a flue gas outlet is formed in the top of the semi-dry desulfurization tower body.
And a plurality of flue gas inlet guide plates are arranged at flue gas inlets of the tower body of the semi-dry desulfurization tower.
The compressed air main pipe is communicated with a compressed air inlet of the corresponding two-fluid atomizing nozzle through each compressed air branch pipe.
The device also comprises a plurality of waste water branch pipes, wherein one waste water branch pipe corresponds to one double-fluid atomizing nozzle, and the filtered desulfurization waste water main pipe is communicated with the desulfurization waste water inlet corresponding to the double-fluid atomizing nozzle through each waste water branch pipe.
The outlet of the double-fluid atomizing nozzle is opposite to the incoming flow direction of the flue gas.
The number of the two-fluid atomizing nozzles is three.
The invention relates to a desulfurization wastewater flue gas waste heat drying method based on a semidry method desulfurization tower, which comprises the following steps:
the filtered desulfurization wastewater output by the desulfurization wastewater main pipe enters a two-fluid atomization nozzle;
compressed air output by the compressed air main pipe is sent into a double-fluid atomizing nozzle, fog drops sprayed out by the double-fluid atomizing nozzle are vertically sprayed downwards into a semi-dry desulfurization tower, hot flue gas enters the semi-dry desulfurization tower through a flue gas inlet, the vertically upward hot flue gas is mixed with the vertically downward sprayed fog drops and conducts heat and mass, desulfurization wastewater is evaporated to dryness, moisture enters the flue gas, and residual salt and ash content after evaporation to dryness are combined and then are brought into an electric dust collector by the flue gas and finally are trapped.
The two-fluid atomizing nozzle had an atomizing angle of 60 °.
The invention has the following beneficial effects:
the system and the method for drying the waste water and the flue gas waste heat based on the semi-dry desulfurization tower have the advantages that during specific operation, desulfurization waste water and compressed air enter the two-fluid atomization nozzle, fog drops sprayed out by the two-fluid atomization nozzle are vertically sprayed downwards into the semi-dry desulfurization tower, hot flue gas enters the semi-dry desulfurization tower through the flue gas inlet, the vertically upward hot flue gas is mixed with the vertically downward sprayed fog drops and is subjected to heat and mass transfer, the desulfurization waste water is evaporated to dryness, moisture enters the flue gas, residual salt and ash are combined and then are brought into the electric dust remover by the flue gas after being evaporated to dryness, and finally the residual salt and the ash are captured, so that the flue gas waste heat after the air preheater is fully utilized to realize the complete evaporation to dryness of the desulfurization waste water; the waste water evaporation is realized by utilizing the low-grade flue gas waste heat after the outlet of the air preheater, so that the operating cost is greatly reduced; meanwhile, because the flue of the original semi-dry desulfurization tower is straight and long, after the gas flow is uniformly distributed by the guide plate, the flue gas flow field in the tower is stable, and the phenomenon of adherence is not easy to occur.
Furthermore, the two-fluid atomizing nozzles are uniformly distributed along the circumferential direction, so that the contact area between the fog drops and the flue gas is larger, the mixing degree is more intense, the evaporation rate of the fog drops is greatly increased, and the temperature distribution of the flue gas after spray evaporation is more uniform; the problem that the central area of the smoke is seriously lower when a single nozzle is arranged is avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a distribution diagram of each two-fluid atomizing nozzle 7 in the present invention.
Wherein, 1 is a compressed air main pipe, 2 is a compressed air branch pipe, 3 is a filtered desulfurization waste water main pipe, 4 is a waste water branch pipe, 5 is a semi-dry desulfurization tower, 6 is a flue gas inlet guide plate, and 7 is a double-fluid atomization nozzle.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and 2, the system for drying the waste water and the flue gas waste heat based on the semi-dry desulfurization tower of the present invention comprises a semi-dry desulfurization tower 5, a compressed air main pipe 1 and a filtered desulfurization waste water main pipe 3, wherein, semi-dry desulfurization tower 5 includes the semi-dry desulfurization tower 5 tower body and sets up a plurality of two fluid atomizing nozzle 7 in the semi-dry desulfurization tower 5 tower body, the female pipe 1 of compressed air is linked together with the compressed air inlet of each two fluid atomizing nozzle 7, the female pipe 3 of desulfurization waste water is linked together with the desulfurization waste water inlet of each two fluid atomizing nozzle 7 after filtering, each two fluid atomizing nozzle 7 is along circumference evenly distributed, the bottom of the semi-dry desulfurization tower 5 tower body is provided with the flue gas inlet, the top of the semi-dry desulfurization tower 5 tower body is provided with the exhanst gas outlet, the flue gas inlet of the semi-dry desulfurization tower 5 tower body is provided with a plurality of flue gas inlet guide plates 6.
The invention also comprises a plurality of compressed air branch pipes 2 and a plurality of waste water branch pipes 4, wherein one compressed air branch pipe 2 corresponds to one double-fluid atomizing nozzle 7, and the compressed air main pipe 1 is communicated with a compressed air inlet corresponding to the double-fluid atomizing nozzle 7 through each compressed air branch pipe 2; one waste water branch pipe 4 corresponds to one double-fluid atomizing nozzle 7, and the filtered desulfurization waste water main pipe 3 is communicated with the desulfurization waste water inlet of the corresponding double-fluid atomizing nozzle 7 through each waste water branch pipe 4.
The outlet of the double-fluid atomizing nozzle 7 is opposite to the incoming flow direction of the flue gas; the number of the two-fluid atomizing nozzles 7 is three.
The net height of the semi-dry desulfurization tower 5 is more than 15 m; the flue gas uniformly flows upwards uniformly and vertically after passing through the flue gas inlet guide plates 6, and the flow speed is 3-5 m/s;
the atomizing angles of the two-fluid atomizing nozzle 7 are both 60 degrees, the spraying direction is vertical and downward, the sprayed fog drops and the upward-running smoke gas are in a countercurrent contact mode, and the particle size of the fog drops is about 30-60 mu m; the two-fluid atomizing nozzles 7 are uniformly distributed at the same height and are uniformly distributed along the circumferential direction by 120 degrees; the distance between the outer side of the atomization area and the tower wall of the semi-dry desulfurization tower 5 is more than 0.5 m; the pressure of the compressed air is 0.5MPa, and the pressure of the wastewater in the wastewater branch is about 0.3 MPa.
The invention relates to a desulfurization wastewater flue gas waste heat drying method based on a semidry method desulfurization tower, which comprises the following steps:
1) the desulfurization waste water output from the filtered desulfurization waste water main pipe 3 enters a double-fluid atomizing nozzle 7 after passing through each waste water branch pipe 4, wherein the pressure of the waste water in the waste water branch pipes 4 is controlled to be 0.3 MPa; particularly, the concentration of suspended matters in the desulfurization wastewater is not higher than 70mg/L, and the maximum particle size of suspended particles is not more than 100 μm;
2) compressed air output from a compressed air main pipe 1 is sent into a double-fluid atomizing nozzle 7 after passing through a compressed air branch pipe 2, fog drops with the particle size of about 30-50 mu m sprayed out of the double-fluid atomizing nozzle 7 are vertically sprayed downwards into a semi-dry desulfurization tower 5, hot flue gas enters the semi-dry desulfurization tower 5 through a flue gas inlet, and the vertically upward hot flue gas is mixed with the vertically downward sprayed fog drops and subjected to heat and mass transfer, wherein desulfurization wastewater is evaporated to dryness within 0.5-3s, moisture enters the flue gas, and residual salt and ash after evaporation are combined and then are brought into an electric dust collector by the flue gas and finally are collected.
According to the invention, three double-fluid atomizing nozzles 7 are uniformly distributed along the tower circumference at 120 degrees, and the fog drops and the flue gas are in countercurrent contact, so that the contact area between the fog drops and the flue gas is larger, the mixing degree is more intense, the fog drop evaporation rate is greatly increased, and the flue gas temperature distribution after spray evaporation is more uniform; the problem that the central area of the smoke is seriously lower when a single nozzle is arranged is avoided; meanwhile, based on the original semi-dry desulfurization tower 5, the construction investment cost is greatly saved, and meanwhile, the flow field of flue gas in the tower is stable by arranging the guide plate, so that the phenomenon of adherence is not easy to occur.

Claims (8)

1. The utility model provides a waste water flue gas waste heat drying system based on semi-dry desulfurization tower, a serial communication port, including semi-dry desulfurization tower (5), female pipe of compressed air (1) and the female pipe of desulfurization waste water (3) after filtering, wherein, semi-dry desulfurization tower (5) include semi-dry desulfurization tower (5) tower body and set up in a plurality of two fluid atomizing nozzle (7) in semi-dry desulfurization tower (5) tower body, the female pipe of compressed air (1) is linked together with the compressed air inlet of each two fluid atomizing nozzle (7), the female pipe of desulfurization waste water (3) after filtering is linked together with the desulfurization waste water inlet of each two fluid atomizing nozzle (7), each two fluid atomizing nozzle (7) are along circumference evenly distributed, the bottom of semi-dry desulfurization tower (5) tower body is provided with the flue gas inlet, the top of semi-dry desulfurization tower (5) tower body is provided with the exhanst gas outlet.
2. The waste water and flue gas waste heat drying system based on the semi-dry desulfurization tower as claimed in claim 1, wherein a plurality of flue gas inlet guide plates (6) are arranged at the flue gas inlet of the tower body of the semi-dry desulfurization tower (5).
3. The wastewater flue gas waste heat drying system based on the semi-dry desulfurization tower as recited in claim 1, further comprising a plurality of compressed air branch pipes (2), wherein one compressed air branch pipe (2) corresponds to one two-fluid atomizing nozzle (7), and the compressed air main pipe (1) is communicated with the compressed air inlet of the corresponding two-fluid atomizing nozzle (7) through each compressed air branch pipe (2).
4. The waste water and flue gas waste heat drying system based on the semi-dry desulfurization tower as claimed in claim 1, further comprising a plurality of waste water branch pipes (4), wherein one waste water branch pipe (4) corresponds to one two-fluid atomizing nozzle (7), and the filtered desulfurization waste water main pipe (3) is communicated with the desulfurization waste water inlet of the corresponding two-fluid atomizing nozzle (7) through each waste water branch pipe (4).
5. The waste water and flue gas waste heat drying system based on the semi-dry desulfurization tower is characterized in that the outlet of the two-fluid atomizing nozzle (7) is opposite to the incoming flow direction of the flue gas.
6. The waste water and flue gas waste heat drying system based on the semi-dry desulfurization tower is characterized in that the number of the two-fluid atomizing nozzles (7) is three.
7. The method for drying the waste heat of the desulfurization wastewater and the flue gas based on the semidry desulfurization tower is characterized in that the system for drying the waste heat of the wastewater and the flue gas based on the semidry desulfurization tower, which is based on the claim 1, comprises the following steps:
the desulfurization waste water output by the filtered desulfurization waste water main pipe (3) enters a double-fluid atomization nozzle (7);
compressed air output by the compressed air main pipe (1) is sent into a double-fluid atomizing nozzle (7), fog drops sprayed out by the double-fluid atomizing nozzle (7) are vertically sprayed downwards into a semi-dry desulfurization tower (5), hot flue gas enters the semi-dry desulfurization tower (5) through a flue gas inlet, the vertically upward hot flue gas and the vertically downward sprayed fog drops are mixed and transfer heat and mass, desulfurization wastewater is evaporated to dryness, moisture enters the flue gas, and residual salt and ash after evaporation to dryness are combined and then are brought into an electric dust remover by the flue gas and finally are collected.
8. The desulfurization waste water flue gas waste heat drying method based on semidry desulfurization tower according to claim 7, characterized in that the two-fluid atomization nozzle (7) has an atomization angle of 60 ° each.
CN202011248462.7A 2020-11-10 2020-11-10 Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower Pending CN112479293A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113144877A (en) * 2021-04-08 2021-07-23 江门市同力环保科技有限公司 Semi-dry desulfurization and dust removal method for waste gas of sludge sintered ceramic ceramsite
CN113428920A (en) * 2021-07-22 2021-09-24 成都市蜀科科技有限责任公司 Energy-saving high-salinity wastewater drying and curing process and device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05154335A (en) * 1990-11-10 1993-06-22 Babcock Hitachi Kk Dry exhaust gas desulfurizer and method
CN101696041A (en) * 2009-10-28 2010-04-21 东南大学 Waste water evaporating device and method using same
CN104129824A (en) * 2014-07-28 2014-11-05 重庆大学 Method for heat-engine plant desulfurization wastewater comprehensive treatment and dust particle emission reduction
CN108423731A (en) * 2018-03-21 2018-08-21 国电科学技术研究院有限公司 The Waste water concentrating liquid stream crystallizing and drying system and method for heat smoke transformation discharge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05154335A (en) * 1990-11-10 1993-06-22 Babcock Hitachi Kk Dry exhaust gas desulfurizer and method
CN101696041A (en) * 2009-10-28 2010-04-21 东南大学 Waste water evaporating device and method using same
CN104129824A (en) * 2014-07-28 2014-11-05 重庆大学 Method for heat-engine plant desulfurization wastewater comprehensive treatment and dust particle emission reduction
CN108423731A (en) * 2018-03-21 2018-08-21 国电科学技术研究院有限公司 The Waste water concentrating liquid stream crystallizing and drying system and method for heat smoke transformation discharge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113144877A (en) * 2021-04-08 2021-07-23 江门市同力环保科技有限公司 Semi-dry desulfurization and dust removal method for waste gas of sludge sintered ceramic ceramsite
CN113428920A (en) * 2021-07-22 2021-09-24 成都市蜀科科技有限责任公司 Energy-saving high-salinity wastewater drying and curing process and device

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Application publication date: 20210312