CN111392792A - Steel plant waste heat method sewage zero discharge and blast furnace slag dechlorination purification method and system - Google Patents
Steel plant waste heat method sewage zero discharge and blast furnace slag dechlorination purification method and system Download PDFInfo
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- CN111392792A CN111392792A CN202010266540.XA CN202010266540A CN111392792A CN 111392792 A CN111392792 A CN 111392792A CN 202010266540 A CN202010266540 A CN 202010266540A CN 111392792 A CN111392792 A CN 111392792A
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- 239000002893 slag Substances 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000010865 sewage Substances 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000006298 dechlorination reaction Methods 0.000 title claims abstract description 14
- 238000000746 purification Methods 0.000 title claims abstract description 14
- 239000010908 plant waste Substances 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000005406 washing Methods 0.000 claims abstract description 66
- 239000002351 wastewater Substances 0.000 claims abstract description 52
- 238000001704 evaporation Methods 0.000 claims abstract description 35
- 230000008020 evaporation Effects 0.000 claims abstract description 35
- 238000011010 flushing procedure Methods 0.000 claims abstract description 29
- 239000002918 waste heat Substances 0.000 claims abstract description 26
- 238000002425 crystallisation Methods 0.000 claims abstract description 11
- 230000008025 crystallization Effects 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 239000012267 brine Substances 0.000 claims description 24
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 6
- 239000012452 mother liquor Substances 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 2
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 25
- 230000023556 desulfurization Effects 0.000 description 25
- 239000003344 environmental pollutant Substances 0.000 description 9
- 231100000719 pollutant Toxicity 0.000 description 9
- 239000012528 membrane Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- XZPVPNZTYPUODG-UHFFFAOYSA-M sodium;chloride;dihydrate Chemical compound O.O.[Na+].[Cl-] XZPVPNZTYPUODG-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- 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
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
A steel plant waste heat method sewage zero discharge and blast furnace slag dechlorination purification method and a system belong to the technical field of sewage zero discharge and steel plant waste slag recycling. The invention adopts the waste heat of the steel plant as a driving heat source, optimizes and innovates the zero discharge of high-concentration wastewater of the whole plant, the blast furnace slag flushing process and the grain slag dechlorination purification process, firstly uses the concentrated water of the sewage treatment station with higher cleaning degree for cleaning the coarse slag, and then sends the coarse slag into the slag flushing tank; feeding various miscellaneous wastewater into an indirect evaporative cooling tower; most of the slag flushing water returns to slag flushing after being sent into a flash evaporator, flash steam is sent into a single-effect waste heat evaporator to be used as a heat source to evaporate and concentrate various mixed wastewater, concentrated solution is sent into a waste heat evaporation crystallizer for salt separation and crystallization after pretreatment, and secondary steam is sent into an indirect evaporation cooling tower to be used as an evaporation and concentration heat source of various mixed wastewater; the condensed water supplements the washing slag. The process comprises three processes of evaporation concentration and salt separation crystallization driven by waste heat, and realizes zero discharge of high-concentration wastewater and dechlorination purification of water slag with low cost.
Description
Technical Field
The invention relates to a method and a system for zero discharge of waste water by a waste heat method and dechlorination and purification of blast furnace slag in an iron and steel plant, belonging to the technical field of zero discharge of waste water and recycling of waste residues in the iron and steel plant.
Background
The steel plant belongs to the typical industry with high energy consumption, high pollution and high emission, has great energy consumption and water consumption, has great emission amount of waste gas, waste water and waste residue, and has great potential hazards of great pollution and secondary pollution although measures for saving energy and water and controlling gas, liquid and solid pollution are carried out in recent years and remarkable progress is made. One typical scenario is: produced desulfurization waste water of the treatment of all kinds of flue gases etc. in the factory, the high enriched waste water that the sewage treatment station produced is often sent to the blast furnace slag and is washed the sediment and evaporate, though digest a large amount of sewage and reduced the sewage by a wide margin and arrange outward, but belong to the transfer of pollutant and even danger wastes material and not radical cure, have uncovered pollution property: a large amount of toxic and harmful pollutants and smoke dust are carried by the flushing slag water vapor and directly emitted to the atmosphere; various pollutants are mixed into the blast furnace granulated slag and are transported out as building material raw materials and the like, and chloride ions, heavy metals, organic hazardous wastes and the like are simultaneously transferred into the granulated slag, so that the quality of recycling the granulated slag is influenced, and the secondary pollution risk also exists; the sewage deeply enters the soil to pollute the soil, water sources and the like for a long time. Therefore, there is a need to fundamentally seek to eliminate this comprehensive polluting production situation.
At present, the conventional method for realizing the external zero discharge of the sewage in the steel plant usually carries out proper decrement on the sewage with lower concentration through pretreatment-membrane concentration, so that the sewage after decrement can be completely eliminated through slag flushing, but various waste salt components and dangerous waste components of the sewage can not be eliminated, the pretreatment requirement of the membrane concentration is extremely high, the cost is higher, and the membrane is frequently blocked, so that the maintenance workload is large, the membrane is frequently replaced, and the operation and maintenance cost is high. In few cases, the MVR technology or the multi-effect evaporation technology is used for evaporation crystallization, but the energy consumption or the steam consumption is high, the operation cost is too high, and the purity of the crystallized salt is not high, so that the resource utilization cannot be realized, and thus, few adopters are used in engineering practice.
Disclosure of Invention
The invention aims at the zero discharge property of the sewage of the steel plant and the main contradiction thereof, optimizes the slag flushing process of the blast furnace slag, increases the graded slag washing and dechlorination purification process, adopts the step waste heat utilization technology to carry out evaporation concentration and salt separation crystallization on various high-concentration waste water in the steel plant, achieves the purposes of greatly reducing various pollutants in the circulating slag flushing water, reducing the content of the water slag pollutants, reducing the pollutant emission amount during slag flushing and the like, improves the quality of the water slag, recovers a large amount of water resources, recovers other resources contained in the waste water on the premise of better controlling the emission of various pollutants, and promotes the organic combination of three-waste treatment and the circular economy.
The invention is described in detail in that the steel plant waste heat method sewage zero discharge and blast furnace slag dechlorination purification method and system comprises four process steps and subsystems of graded slag washing, slag flushing, various waste water waste heat concentration processes and high-concentration waste water waste heat evaporation salt separation crystallization, and is characterized in that a feed inlet of a slag washing vehicle 1 of the graded slag washing process is communicated with a slag outlet of a slag water pool 3, a first slag washing water inlet of the slag washing vehicle 1 of the graded slag washing process is communicated with a water supply pipe of a concentrated brine A of a sewage treatment station, a slag washing waste water outlet of the slag washing vehicle 1 of the graded slag washing process is connected with a slag washing water inlet of the slag water pool 3, a slag washing vehicle 1 of the graded slag washing process is also provided with a discharge port of purified water slag B, a slag flushing water outlet of the slag water pool 3 is connected with a high-temperature water inlet of a flash evaporator 5 through a circulating pump 4, a high-temperature water outlet of the flash evaporator 5 is communicated with a water inlet of a slag flushing tower bottom slag washing tower 2, a feed inlet of the slag flushing water tank 3 of the slag flushing water tank 2, a discharge port of the slag flushing water tank 2 of the slag flushing tower 2 is communicated with a discharge port of the slag flushing water pool 3, a flushing water outlet of the flash evaporator 5 and a waste water outlet of the flash evaporator are respectively connected with a high-concentrated brine evaporator, a waste water condensate water inlet of a concentrated brine evaporator, a waste water condenser, a waste water outlet of a waste water condenser, a waste water condenser C condensate water outlet of a waste water outlet of a concentrated brine evaporator is respectively connected with a concentrated brine evaporator, a condensate water outlet of a concentrated brine evaporator, a condensate water inlet of a concentrated brine evaporator is provided with a concentrated brine evaporator, a condensate water outlet of a condensate water condenser C condensate water outlet of a condensate water condenser C condensate water outlet of a condensate water tank 7 of a condensate water condenser 6 of a condensate water tank 7 of a condensate water outlet of a condensate water preheater of a condensate water outlet of a condensate water preheater 7 of a condensate water preheater of a condensate water outlet of a condensate water preheater 7 of a condensate water preheater 7 of a condensate water outlet of a.
The first slag washing water inlet of the slag washing vehicle 1 is arranged on one side, close to the feeding hole, of the slag washing vehicle 1, and the second slag washing water inlet is arranged on one side, close to the discharging hole, of the slag washing vehicle 1.
The mother liquor outlet of the waste heat evaporation crystallizer 16 is communicated with the slag water tank 3.
The heat exchanger 9 adopts a tube bundle type heat exchanger structure of negative pressure steam condensation in the tube and adopts a negative pressure primary evaporation heat exchange structure.
The single-effect waste heat evaporation concentrator 6 adopts a crystal seed and particle anti-scaling structure and adopts a negative pressure primary evaporation heat exchange structure.
The waste heat evaporation crystallizer 16 adopts a crystal seed and particle anti-scaling structure of large-particle crystallization salt, and adopts a positive pressure one-level heat exchange structure, a positive pressure multi-level heat exchange structure, a negative pressure one-level evaporation heat exchange structure or a negative pressure multi-level evaporation heat exchange structure.
The invention has the technical effects that: the method solves the problem of treatment of high-concentration sewage in the plant and control of pollutants in blast furnace slag flushing, which are key links disturbing zero discharge and deep pollution control of sewage in steel plants at present, and can effectively improve the water quality and quality of slag flushing circulating water, the pollutant discharge level in the slag flushing process, and recovered water resources so as to reduce the water consumption per ton of steel, effectively reduce the operating cost and the like. Compared with the conventional sewage membrane concentration and evaporative crystallization technology, the method can reduce 80-90% of artificial energy requirements, greatly reduce energy consumption and reduce the operation cost by one order of magnitude, and becomes a key technical mode of comprehensive sewage zero discharge and resource recovery built and used by users in the high-salinity wastewater treatment and reuse field of steel plants. The invention can realize the mode conversion from a high-pollution and high-discharge mode to a clean production type green factory mode with zero discharge of process sewage and obviously reduced water resource consumption in the steel plant industry, has technical and economic values and environmental protection and social effects, and also has industrial application value and social and economic benefits for realizing a circular economic treatment mode for high-salinity wastewater of other industrial enterprises.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The parts in fig. 1 are numbered and named as follows.
The slag washing vehicle comprises a slag washing vehicle 1, a slag washing tower 2, a slag water pool 3, a circulating pump 4, a flash evaporator 5, a single-effect waste heat evaporation concentrator 6, an indirect evaporation cooling tower 7, a spraying area 8, a heat exchanger 9, a tower bottom water pool 10, a pretreatment pool 11, an air inlet 12, an air outlet 13, a softening clarification pool 14, a deamination device 15, a waste heat evaporation crystallizer 16, a drying and packaging device 17, a sewage treatment station strong brine A, purified water slag B, slag washing water supplement C, outside feeding condensate D, sintering machine desulfurization wastewater E, pellet desulfurization wastewater F, boiler desulfurization wastewater G, sewage treatment station strong brine water H, inlet air J, exhaust air K, a medicament L, sludge M, pure salt N, mother liquor P and outside discharge condensate Q.
Detailed Description
FIG. 1 is a schematic diagram of the system of the present invention.
The specific embodiment of the invention is that the steel plant waste heat method sewage zero discharge and blast furnace slag dechlorination purification method and system comprises four process steps and subsystems of graded slag washing, slag flushing, various waste water waste heat concentration processes and high-concentration waste water waste heat evaporation salt separation crystallization, and is characterized in that a feed inlet of a slag washing vehicle 1 of the graded slag washing process is communicated with a slag outlet of a slag water pool 3, a first slag washing water inlet of the slag washing vehicle 1 of the graded slag washing process is communicated with a water supply pipe of concentrated brine A of a sewage treatment station, a slag washing waste water outlet of the slag washing vehicle 1 of the graded slag washing process is communicated with a slag washing water inlet of the slag water pool 3, a slag washing vehicle 1 of the graded slag washing process is also provided with a discharge port of purified water slag B, a slag flushing water outlet of the slag water pool 3 is connected with a high-temperature water inlet of a flash evaporator 5 through a circulating pump 4, a high-temperature water outlet of the flash evaporator 5 is communicated with a water inlet of a slag flushing tower bottom slag washing tower 2, a bottom discharge port of the slag flushing water pool 2 is communicated with a feed outlet of the slag flushing water pool 3, a waste water inlet of the flash evaporator is respectively communicated with a waste water condensate water outlet of a waste water condensate water tank, a waste water inlet of a waste water condensate water outlet of a waste water condensate water tank, a waste water outlet of a waste water condensate water outlet of a waste water concentrator, a waste water concentrator of a waste water outlet of a waste water concentrator, a waste water concentrator of a desulfurization tower bottom, a desulfurization tower bottom of a desulfurization tower is respectively connected with a desulfurization tower is provided with a desulfurization tower bottom of a desulfurization tower, a desulfurization tower bottom of a desulfurization tower is provided with a desulfurization tower, a desulfurization tower is provided with a desulfurization tower bottom of a desulfurization tower, a desulfurization tower bottom of a desulfurization tower is provided with a desulfurization tower, a desulfurization tower bottom of a desulfurization tower, a desulfurization tower is provided with a desulfurization tower bottom of a desulfurization tower, a desulfurization tower.
The first slag washing water inlet of the slag washing vehicle 1 is arranged on one side, close to the feeding hole, of the slag washing vehicle 1, and the second slag washing water inlet is arranged on one side, close to the discharging hole, of the slag washing vehicle 1.
The mother liquor outlet of the waste heat evaporation crystallizer 16 is communicated with the slag water tank 3.
The heat exchanger 9 adopts a tube bundle type heat exchanger structure of negative pressure steam condensation in the tube and adopts a negative pressure primary evaporation heat exchange structure.
The single-effect waste heat evaporation concentrator 6 adopts a crystal seed and particle anti-scaling structure and adopts a negative pressure primary evaporation heat exchange structure.
The waste heat evaporation crystallizer 16 adopts a crystal seed and particle anti-scaling structure of large-particle crystallization salt, and adopts a positive pressure one-level heat exchange structure, a positive pressure multi-level heat exchange structure, a negative pressure one-level evaporation heat exchange structure or a negative pressure multi-level evaporation heat exchange structure.
It should be noted that the present invention provides a method for solving the problems of zero discharge of high-concentration wastewater in steel plants, clean production of blast furnace slag flushing, etc. completely by using a heat exchange method, a waste heat evaporation and energy gradient utilization method, a gradient slag washing method, etc., and according to this overall solution, there are different specific implementation measures and specific implementation apparatuses with different structures, and the above specific implementation is only a preferred implementation, but any other similar simple modified implementation, such as the type selection and number change related to the waste heat recovery heat exchanger; the waste heat source type adopts low-pressure steam with the temperature lower than 100 ℃, positive-pressure steam with the temperature higher than the atmospheric pressure, or waste heat hot water, smoke and the like; only a part of the claims, but not all of the waste heat driven evaporation, or sewage pretreatment flow, or post-treatment flow, etc. are implemented; or simply replacing membranes with different types, performances and qualities or other sewage treatment devices to perform sewage treatment in corresponding links; or other modifications and the like which can be considered by a person skilled in the art; or the technical mode can be adapted to different application scenes by the same or similar methods, systems and structures, and the invention also falls into the protection scope of the invention.
Claims (6)
1. The system comprises four process steps and subsystems of graded slag washing, slag flushing, various wastewater residual heat concentration processes and high-concentration wastewater residual heat evaporation salt separation crystallization, and is characterized in that a feed inlet of a slag washing vehicle (1) of the graded slag washing process is communicated with a slag outlet of a slag washing water tank (3), a first slag washing water inlet of the slag washing vehicle (1) of the graded slag washing process is communicated with a water supply pipe of a concentrated brine A of a sewage treatment station, a slag washing wastewater outlet of the slag washing vehicle (1) of the graded slag washing process is connected with a slag washing water inlet of a slag washing water tank (3), a slag washing water outlet of the slag washing vehicle (1) of the graded slag washing process is connected with a high-temperature water inlet of a flash evaporator (5) through a circulating pump (4), a high-temperature water outlet of the flash evaporator (5) is communicated with a water inlet of a slag flushing tower (2), a discharge outlet of the purified water slag washing water tank (B) of the graded slag washing vehicle (1) of the graded slag washing process is communicated with a high-temperature water inlet of the flash evaporator (5) through a circulating pump (4), a waste water inlet of the flash evaporator condenser, a waste water inlet of the flash evaporator is communicated with a concentrated brine condenser, a waste water inlet of a concentrated brine condenser (5), a waste water inlet of a concentrated brine condenser (7) of a concentrated brine condenser, a waste water inlet of a concentrated brine condenser, a concentrated brine condenser (7) of a concentrated brine condenser, a waste water inlet of a concentrated brine condenser is connected with a concentrated brine condenser, a concentrated brine condenser outlet of a condensate water outlet of a concentrated brine condenser, a concentrated brine condenser (7) of a concentrated brine condenser (16) of a condensate water outlet of a condensate water inlet of a condensate water outlet of a.
2. The steel plant waste heat process sewage zero emission and blast furnace slag dechlorination purification method and system according to claim 1, characterized in that the first slag washing water inlet of the slag washing vehicle (1) is arranged at one side of the slag washing vehicle (1) close to the feed inlet, and the second slag washing water inlet is arranged at one side of the slag washing vehicle (1) close to the discharge outlet.
3. The steel plant waste heat process sewage zero emission and blast furnace slag dechlorination purification method and system according to claim 1, characterized in that the mother liquor outlet of the waste heat evaporative crystallizer (16) is communicated with the slag water tank (3).
4. The steel plant waste heat process sewage zero discharge and blast furnace slag dechlorination purification method and system according to claim 1, characterized in that the heat exchanger (9) adopts a tube bundle type heat exchanger structure of in-tube negative pressure steam condensation and adopts a negative pressure primary evaporation heat exchange structure.
5. The steel plant waste heat process sewage zero emission and blast furnace slag dechlorination purification method and system according to claim 1, characterized in that the single-effect waste heat evaporation concentrator (6) adopts a crystal seed and particle anti-scaling structure and adopts a negative pressure primary evaporation heat exchange structure.
6. The steel plant waste heat method sewage zero emission and blast furnace slag dechlorination purification method and system according to claim 1, characterized in that the waste heat evaporation crystallizer (16) adopts large-particle crystallization salt-forming crystal seeds and particle anti-scaling structures, and adopts a positive pressure one-stage heat exchange structure, a positive pressure multi-stage heat exchange structure, a negative pressure one-stage evaporation heat exchange structure or a negative pressure multi-stage evaporation heat exchange structure.
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| CN202010266540.XA CN111392792B (en) | 2020-04-07 | 2020-04-07 | Zero-emission sewage and blast furnace slag dechlorination purification method and system by waste heat method in steel plant |
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| CN202010266540.XA CN111392792B (en) | 2020-04-07 | 2020-04-07 | Zero-emission sewage and blast furnace slag dechlorination purification method and system by waste heat method in steel plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870755A (en) * | 2021-01-11 | 2021-06-01 | 青岛理工大学 | Potassium chloride solution concentration and crystallization production system based on waste heat of blast furnace slag flushing water and working method |
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2020
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| CN112870755A (en) * | 2021-01-11 | 2021-06-01 | 青岛理工大学 | Potassium chloride solution concentration and crystallization production system based on waste heat of blast furnace slag flushing water and working method |
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