CN213955278U - Energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling - Google Patents
Energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling Download PDFInfo
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- CN213955278U CN213955278U CN202022920878.0U CN202022920878U CN213955278U CN 213955278 U CN213955278 U CN 213955278U CN 202022920878 U CN202022920878 U CN 202022920878U CN 213955278 U CN213955278 U CN 213955278U
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
An energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling belongs to the technical field of flue gas treatment and circular economy. Aiming at the problem that flue gas tail plumes of thermal power plants or industrial kilns realizing ultralow emission carry a large amount of nano-scale fine particles and acid gas, a flue gas spraying heat exchange purification unit is adopted to recover flue gas waste heat and water resources, meanwhile, a large amount of acid gas such as sulfur dioxide and the like, nano-scale fine particles such as fine gypsum and the like remained in the flue gas tail plumes are intercepted, and are carried by condensed water discharged water, fresh water and concentrated water are separated through a thickener component, the fresh water is used as make-up water such as circulating water in the plant and the like, the concentrated water can be used for desulfurization and make-up water, the desulfurization waste water passes through an evaporation salt separation crystallization component driven by the flue gas and the like, the water resources are recovered and converted into building materials, industrial raw materials and the like, and secondary waste heat can be recycled. The device can also run in a pure environment-friendly way in a non-heating period, and is expected to become an energy-saving environment-friendly integrated way for effectively realizing real cleaning and resource treatment of the flue gas.
Description
Technical Field
The utility model relates to an energy-concerving and environment-protective integration system based on flue gas waste heat and pollutant resource in coordination belongs to the flue gas and administers and the circular economy technical field.
Background
The exhaust smoke of boilers, various industrial kilns and the like which are heated by burning fossil fuels such as coal, natural gas and the like contains a large amount of water vapor and a plurality of gaseous and solid pollutants, becomes an important pollutant source influencing the atmospheric environment, and is one of the main factors causing frequent haze weather. In recent years, by adopting a novel high-precision nano-scale particle detection instrument and a novel high-precision nano-scale particle measurement method, theoretical research and engineering actual measurement are carried out on the measurement method and the component characteristics of polymorphic particles in wet desulphurization flue gas, and the result shows that even in a thermal power plant realizing ultra-low emission, the content of the micro particles in the flue gas can still reach 100mg/Nm3 grade, and the research shows that the distribution conditions of 11 main ions in the flue gas are as follows: ions containing sulfate radicals and sulfite radicals account for more than 82% of the total mass and are the main sources of PM 2.5; nitrite content is also relatively high, so it is necessary to include fugitive particulates, such as soluble particulates, within the monitoring and remediation window.
When wet desulphurization is adopted, a large amount of pollutants such as enriched chlorine radicals and the like contained in desulphurization circulating water need to be discharged in time, high-concentration wastewater also needs to be discharged continuously, the desulphurization wastewater is a dangerous waste pollutant, and is mostly mixed with low-concentration wastewater through simple treatment at present and then discharged, so that the risk of secondary pollution exists. A large amount of condensed water can be generated in the deep recovery of the flue gas waste heat, the condensed water contains pollutant components in the flue gas, and the water resource recycling can be performed after the deep treatment is often needed.
The above actual measurement research results show that one of the biggest problems existing in the current flue gas treatment is as follows: under the condition that ultra-low emission of a thermal power plant is realized, a large amount of pollutants such as ultrafine particles cannot be effectively measured and are difficult to effectively intercept, and particularly, the deep treatment of the pollutants often has the problems that the investment is too large, the operating cost is too high, and most enterprises cannot afford to pay attention, so that a plurality of problems and blind spots exist from the technical to the policy at present.
SUMMERY OF THE UTILITY MODEL
The purpose and task of the utility model are that aiming at the problem that the boiler smoke exhaust full-component analysis shows that the smoke exhaust full-component analysis has a large amount of soluble salt escape and the like to obviously influence the haze formation and the air pollution, the process flows of full-resource utilization of the waste heat driven smoke and the full-component treatment of pollutants, diversion and recycling of condensed water after concentration, zero discharge of waste heat driven desulfurization wastewater and resource recovery and the like are realized, the escaped pollutants of the current situations such as vapor, soluble salt, acid gas and the like in the smoke exhaust are effectively reduced, therefore, the purposes of fundamentally and cleanly discharging the fume exhaust device of the boiler and preventing haze treatment are achieved, the removed pollutants are recycled, the environmental protection benefit and the circular economy are realized, and the environmental protection treatment of the fume is changed into a sustainable economic development mode for developing the fume resource.
The utility model discloses a concrete description is: energy-concerving and environment-protective integration system based on flue gas waste heat and pollutant are resource in coordination, its characterized in that: the energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling comprises a flue gas high-temperature section waste heat recoverer, a flue gas spraying heat exchange purification unit, a condensed water concentration unit, a desulfurization wastewater zero-discharge and recycling recovery assembly, wherein the specific process system is as follows.
i. An outlet of a smoke discharge Y4 of a tail heating surface 2 of the boiler 1 is connected with a smoke inlet of a smoke discharge high-temperature section waste heat recoverer 6 through a dust remover 4 and an induced draft fan 5, a smoke outlet of the smoke discharge high-temperature section waste heat recoverer 6 is communicated with a smoke inlet of a desulfurizing tower 7, a smoke outlet of the desulfurizing tower 7 is connected with a smoke inlet of a smoke spray heat exchange purification unit 9, an outlet of purified smoke Y6 at the upper part of the smoke spray heat exchange purification unit 9 is communicated with the outside atmosphere, and a tower bottom water pool 9g is arranged at the lower part of the smoke spray heat exchange purification unit 9.
And ii, a high-temperature residual heat water outlet of the tower bottom water tank 9g is communicated with a water outlet pipe of condensed water drainage B, an inlet of high-temperature side water inlet R1 of the residual heat user heater 10 and a cooling tower circulating water inlet through a circulating water pump respectively, a water outlet pipe of the condensed water drainage B is connected with a water inlet of a condensed water pretreatment tank 11a of the condensed water concentrating unit 11, a water outlet of the condensed water pretreatment tank 11a is connected with a water inlet of a concentrating component 11B of the condensed water concentrating unit 11, the concentrating component 11B is provided with an outlet of fresh water B1 and an outlet of concentrated water B2, and an outlet of the concentrated water B2 is communicated with an inlet of a desulfurization water supplementing pipe.
iii, the water S discharged from the desulfurizing tower 7 enters a buffer tank 8, a water outlet pipe of the desulfurization circulating backwater SH at a circulating water outlet of the buffer tank 8 is communicated with a water replenishing water inlet pipe of concentrated water B2 and a water inlet pipe of desulfurization circulating water supply SG, the buffer tank 8 is also provided with a gypsum SS discharge port and a desulfurization wastewater P1 discharge port, wherein the desulfurization wastewater P1 discharge port is communicated with a feed inlet of a wastewater pretreatment tank 12a of the desulfurization wastewater zero-discharge and resource recovery component 12, the wastewater pretreatment tank 12a is also provided with a drug feeding inlet of a drug G, a discharge port of desulfurization solid waste SP of building material raw materials including gypsum and heavy metal stabilizing compounds and an outlet of desulfurization wastewater pretreatment water P2, the outlet of the desulfurization wastewater pretreatment water P2 is connected with the feed inlet of a waste heat evaporation crystallizer 12B, and a high-temperature side inlet of the waste heat evaporation crystallizer 12B is connected with a heated water or steam outlet of a, a high-temperature side water outlet of the waste heat evaporation crystallizer 12b is connected with a heated water inlet of the exhaust smoke high-temperature section waste heat recoverer 6, the waste heat evaporation crystallizer 12b is further provided with a discharge hole of industrial-grade sodium chloride NC and an outlet of sewage side secondary steam Q, the outlet of the sewage side secondary steam Q is connected with a steam inlet of the secondary steam heat recoverer 12c, the secondary steam heat recoverer 12c is further provided with a water outlet of secondary steam condensate QN and an inlet and an outlet of low-temperature side heated water, wherein the inlet of secondary waste hot water inlet J1 of the secondary steam heat recoverer 12c is connected with a process return water H2 of the waste heat user heater 10 or a water outlet pipe of heating return water H3, and the outlet of secondary waste hot water outlet J2 of the secondary steam heat recoverer 12c is communicated with a high-temperature process water return pipe.
An outlet of high-temperature side outlet water R2 of the waste heat user heater 10 is connected with a water inlet of a circulating spray device 9c of the flue gas spray heat exchange purification unit 9, a low-temperature side inlet of the waste heat user heater 10 is communicated with a water return pipe of hot user return water H0, and an outlet of low-temperature side outlet water H1 of the waste heat user heater 10 is respectively communicated with a water outlet pipe of process return water H2 and a water outlet pipe of heating return water H3.
Flue gas sprays heat transfer purification unit 9 is inside to be provided with multistage washing condensation heat transfer structure, follows from upwards doing in proper order: the device comprises a flue gas inlet section 9f, a washing condensation rain area 9e, a washing heat exchanger 9d, a circulating spray device 9c, a demister 9b and a flue gas outlet section 9a, wherein the outlet of purified flue gas Y6 at the upper part of the flue gas outlet section 9a is communicated with the outside atmosphere, and a tower bottom water tank 9g is arranged at the lower part of the flue gas inlet section 9 f.
The exhaust smoke high-temperature section waste heat recoverer 6 adopts an extrusion-molded aluminum fin heat exchange tube structure externally coated with a graphene material.
The washing heat exchanger 9d adopts a condensation heat exchange material which is resistant to strong acid and strong alkali corrosion and resistant to scaling and fouling.
The concentration component 11b adopts a nanofiltration membrane, a reverse osmosis membrane or a waste heat method evaporation concentrator structure.
The waste heat evaporation crystallizer 12b adopts a crystal seed method evaporation concentration and salt separation crystallizer structure.
The utility model discloses carry more particle pollutants especially a large amount of nanometer fine particle thing (PM 0.3 and below) and acid gas to current situation boiler flue gas tail plume, belong to one of the main causes of haze, and pollute the problem of neighbouring ground environment, adopt flue gas spray heat transfer purification unit to retrieve flue gas waste heat and water resource when, intercept residual a large amount of vapor in the flue gas tail plume, sulfur dioxide, acid gas and polarity molecule such as hydrogen chloride, nanometer fine particle thing such as fine gypsum, including Filterable Particulate Matter (FPM), can Condense Particulate Matter (CPM) and soluble particulate matter (DPM) etc. in the nanometer fine particle thing (EPM), and carry by the condensate drainage, separate fresh water and dense water through concentrator group earlier, fresh water is as the oxygen-eliminating water, the moisturizing of circulating water etc., dense water is as the desulfurizing tower moisturizing, desulfurization waste water then passes through waste heat driven evaporation salt separation crystallization subassembly such as flue gas, the water resource is recovered and converted into building materials, industrial raw materials and the like, and the secondary waste heat is used for heating and process water heating. According to the smoke-discharging device, the resource utilization of hot, wet and dangerous waste of the smoke is realized, the clean smoke is discharged in a high-altitude diffusion mode, and the substantial adverse effects of the smoke discharged from the boiler on haze formation and the surrounding air environment are fundamentally and greatly reduced or basically eliminated.
Furthermore, waste heat recovery is used as a main driving force in the processes of zero discharge of wastewater containing smoke pollutants and recycling recovery of the wastewater, all water resources are recovered, and the content is subjected to grading treatment, wherein heavy metal ions are removed by dosing precipitation and converted into a stable chemical combination state which can be used as a building material raw material; phosphate radical is converted into gypsum through a waste heat evaporation salt separation crystallization process, and chloride radical is converted into industrial raw materials such as industrial-grade sodium chloride and the like, so that conversion of pollutants into resources is realized.
Finally, different grades of waste heat resources of the flue gas are extracted in a grading mode and are respectively used for the driving process, and the waste heat resources are used for heating combustion-supporting air of the boiler to save coal, heating return water of a heating network or process water to save steam and the like, so that more remarkable energy-saving benefits are generated, and the fuel consumption and the pollution discharge amount of the fuel are correspondingly reduced due to energy saving.
The energy-saving benefit and the resource recovery benefit are obvious, so that multiple effects of flue gas pollution treatment, resource utilization, energy-saving benefit and the like are realized, and an integrated treatment process of energy conservation and emission reduction is realized, so that the environment-friendly investment and operation with economic benefits are realized, and the energy-saving boiler flue gas treatment method has obvious technical and economic advantages in the fields of deep energy-saving recovery and emission reduction treatment of boiler flue gas.
When the system has a large heating load demand in winter, the steam condensation waste heat can be greatly converted into heat recovery heating, and comprehensive recycling of heat, humidity and pollutants is realized. But the pure environment-friendly operation can be carried out in the non-heating period or when the waste heat cannot be utilized, the cooling tower can carry out small-amplitude cooling to ensure that necessary small amount of condensed water is continuously separated out, the effects of discharging sewage and controlling the concentration of circulating water can be achieved, and the waste heat can be used as desulfurization water for secondary utilization. At the moment, part of the waste heat can be used for preheating inlet air of the boiler to save fuel, and downstream heat users such as process water heating and the like are required to be searched to realize waste heat utilization benefit, otherwise, when the waste heat cannot be utilized more, the part of the waste heat can be dissipated into the atmosphere by additionally arranging a cooling tower and the like, but at the moment, part of water supplement, water pump, fan power consumption and the like are required to be consumed, so that the stepped condensed water film decontamination process is realized to achieve the purposes of deeply reducing smoke pollution emission and visually eliminating the white in summer.
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 system comprises a boiler 1, a tail heating surface 2, an air blower 3, a dust remover 4, an induced draft fan 5, a smoke-discharging high-temperature section waste heat recoverer 6, a desulfurizing tower 7, a buffer tank 8, a smoke spray heat exchange purification unit 9, a waste heat user heater 10, a condensed water concentration unit 11, a condensed water pretreatment tank 11a, a concentration component 11B, a desulfurization waste water zero-discharge and resource recovery component 12, a waste water pretreatment tank 12a, a waste heat evaporation crystallizer 12B, a secondary steam heat recoverer 12c, condensed water drainage B, fresh water B1, concentrated water B2, a medicament G, hot user backwater H0, low-temperature side effluent H1, process backwater H2, heating backwater H3, secondary waste water inlet J1, secondary waste water outlet J2, industrial grade sodium chloride NC, desulfurization waste water P1, desulfurization waste water pretreatment P2, sewage side secondary steam Q, secondary steam condensate QN, high-temperature side inlet R1, high-temperature side effluent R2, and a secondary effluent R2, The system comprises desulphurization circulating backwater SH, desulphurization circulating water supply SG, gypsum SS, desulphurization solid waste SP, flue gas Y4 and purified flue gas Y6.
Detailed Description
Fig. 1 is a system schematic and embodiment of the present invention.
The specific embodiment of the present invention is as follows. An energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling comprises a flue gas high-temperature section waste heat recoverer, a flue gas spraying heat exchange purification unit, a condensed water concentration unit, a desulfurization wastewater zero-discharge and recycling recovery assembly, wherein the specific process system is as follows.
i. An outlet of a smoke discharge Y4 of a tail heating surface 2 of the boiler 1 is connected with a smoke inlet of a smoke discharge high-temperature section waste heat recoverer 6 through a dust remover 4 and an induced draft fan 5, a smoke outlet of the smoke discharge high-temperature section waste heat recoverer 6 is communicated with a smoke inlet of a desulfurizing tower 7, a smoke outlet of the desulfurizing tower 7 is connected with a smoke inlet of a smoke spray heat exchange purification unit 9, an outlet of purified smoke Y6 at the upper part of the smoke spray heat exchange purification unit 9 is communicated with the outside atmosphere, and a tower bottom water pool 9g is arranged at the lower part of the smoke spray heat exchange purification unit 9.
And ii, a high-temperature residual heat water outlet of the tower bottom water tank 9g is communicated with a water outlet pipe of condensed water drainage B, an inlet of high-temperature side water inlet R1 of the residual heat user heater 10 and a cooling tower circulating water inlet through a circulating water pump respectively, a water outlet pipe of the condensed water drainage B is connected with a water inlet of a condensed water pretreatment tank 11a of the condensed water concentrating unit 11, a water outlet of the condensed water pretreatment tank 11a is connected with a water inlet of a concentrating component 11B of the condensed water concentrating unit 11, the concentrating component 11B is provided with an outlet of fresh water B1 and an outlet of concentrated water B2, and an outlet of the concentrated water B2 is communicated with an inlet of a desulfurization water supplementing pipe.
iii, the water S discharged from the desulfurizing tower 7 enters a buffer tank 8, a water outlet pipe of the desulfurization circulating backwater SH at a circulating water outlet of the buffer tank 8 is communicated with a water replenishing water inlet pipe of concentrated water B2 and a water inlet pipe of desulfurization circulating water supply SG, the buffer tank 8 is also provided with a gypsum SS discharge port and a desulfurization wastewater P1 discharge port, wherein the desulfurization wastewater P1 discharge port is communicated with a feed inlet of a wastewater pretreatment tank 12a of the desulfurization wastewater zero-discharge and resource recovery component 12, the wastewater pretreatment tank 12a is also provided with a drug feeding inlet of a drug G, a discharge port of desulfurization solid waste SP of building material raw materials including gypsum and heavy metal stabilizing compounds and an outlet of desulfurization wastewater pretreatment water P2, the outlet of the desulfurization wastewater pretreatment water P2 is connected with the feed inlet of a waste heat evaporation crystallizer 12B, and a high-temperature side inlet of the waste heat evaporation crystallizer 12B is connected with a heated water or steam outlet of a flue gas high-temperature section waste heat recovery device 6, a high-temperature side water outlet of the waste heat evaporation crystallizer 12b is connected with a heated water inlet of the exhaust smoke high-temperature section waste heat recoverer 6, the waste heat evaporation crystallizer 12b is further provided with a discharge hole of industrial-grade sodium chloride NC and an outlet of sewage side secondary steam Q, the outlet of the sewage side secondary steam Q is connected with a steam inlet of the secondary steam heat recoverer 12c, the secondary steam heat recoverer 12c is further provided with a water outlet of secondary steam condensate QN and an inlet and an outlet of low-temperature side heated water, wherein the inlet of secondary waste hot water inlet J1 of the secondary steam heat recoverer 12c is connected with a process return water H2 of the waste heat user heater 10 or a water outlet pipe of heating return water H3, and the outlet of secondary waste hot water outlet J2 of the secondary steam heat recoverer 12c is communicated with a high-temperature process water return pipe.
An outlet of high-temperature side outlet water R2 of the waste heat user heater 10 is connected with a water inlet of a circulating spray device 9c of the flue gas spray heat exchange purification unit 9, a low-temperature side inlet of the waste heat user heater 10 is communicated with a water return pipe of hot user return water H0, and an outlet of low-temperature side outlet water H1 of the waste heat user heater 10 is respectively communicated with a water outlet pipe of process return water H2 and a water outlet pipe of heating return water H3.
Flue gas sprays heat transfer purification unit 9 is inside to be provided with multistage washing condensation heat transfer structure, follows from upwards doing in proper order: the device comprises a flue gas inlet section 9f, a washing condensation rain area 9e, a washing heat exchanger 9d, a circulating spray device 9c, a demister 9b and a flue gas outlet section 9a, wherein the outlet of purified flue gas Y6 at the upper part of the flue gas outlet section 9a is communicated with the outside atmosphere, and a tower bottom water tank 9g is arranged at the lower part of the flue gas inlet section 9 f.
The exhaust smoke high-temperature section waste heat recoverer 6 adopts an extrusion-molded aluminum fin heat exchange tube structure externally coated with a graphene material.
The washing heat exchanger 9d adopts a condensation heat exchange material which is resistant to strong acid and strong alkali corrosion and resistant to scaling and fouling.
The concentration component 11b adopts a nanofiltration membrane structure.
The waste heat evaporation crystallizer 12b adopts a crystal seed method evaporation concentration and salt separation crystallizer structure.
It should be noted that the present invention provides a method, a system and an implementation device for recycling the flue gas waste heat and water resources and pollutants in a comprehensive coordinated manner, and a device for implementing the method, the system and the device for implementing the resource utilization, and different specific implementation measures and different specific implementation devices with different structures can be provided according to the overall solution, the above specific implementation is only one of them, and any other similar simple deformation implementation, for example, different heat exchange structures are adopted; increasing or reducing a plurality of layers of step treatment measures; or simply adjusting the pipeline connection method, the water inlet and outlet sources and the grading number of the waste heat water system; or the technical mode can be applied to different power equipment smoke exhaust or air exhaust types, and other similar application occasions by the same or similar structures, and the like, and all fall into the protection scope of the utility model.
Claims (6)
1. Energy-concerving and environment-protective integration system based on flue gas waste heat and pollutant are resource in coordination, its characterized in that: the energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling comprises a flue gas high-temperature section waste heat recoverer, a flue gas spraying heat exchange purification unit, a condensed water concentration unit, a desulfurization wastewater zero-discharge and recycling recovery assembly, wherein the specific process system comprises the following components:
i. an outlet of smoke (Y4) of a tail heating surface (2) of the boiler (1) is connected with a smoke inlet of a smoke exhaust high-temperature section waste heat recoverer (6) through a dust remover (4) and an induced draft fan (5), a smoke outlet of the smoke exhaust high-temperature section waste heat recoverer (6) is communicated with a smoke inlet of a desulfurizing tower (7), a smoke outlet of the desulfurizing tower (7) is connected with a smoke inlet of a smoke spray heat exchange purification unit (9), an outlet of purified smoke (Y6) at the upper part of the smoke spray heat exchange purification unit (9) is communicated with the outside atmosphere, and a tower bottom water tank (9g) is arranged at the lower part of the smoke spray heat exchange purification unit (9);
ii, a high-temperature residual heat water outlet of a tower bottom water tank (9g) is communicated with a water outlet pipe of condensed water drainage (B), an inlet of high-temperature side water inlet (R1) of a residual heat user heater (10) and a cooling tower circulating water inlet respectively after passing through a circulating water pump, a water outlet pipe of the condensed water drainage (B) is connected with a water inlet of a condensed water pretreatment tank (11a) of a condensed water concentration unit (11), a water outlet of the condensed water pretreatment tank (11a) is connected with a water inlet of a concentration component (11B) of the condensed water concentration unit (11), the concentration component (11B) is provided with an outlet of fresh water (B1) and an outlet of concentrated water (B2), wherein an outlet of the concentrated water (B2) is communicated with an inlet of a desulfurization water replenishing pipe;
iii, the effluent (S) of the desulfurizing tower (7) enters a buffer pool (8), a water outlet pipe of the desulfurization circulating backwater (SH) at the circulating water outlet of the buffer pool (8) is communicated with a water replenishing inlet pipe of concentrated water (B2) and a water inlet pipe of desulfurization circulating water Supply (SG), the buffer pool (8) is also provided with a gypsum (SS) discharge port and a desulfurization wastewater (P1) discharge port, wherein the desulfurization wastewater (P1) discharge port is communicated with a feed port of a wastewater pretreatment pool (12a) of a desulfurization wastewater zero-discharge and resource recovery component (12), the wastewater pretreatment pool (12a) is also provided with a chemical agent (G) feeding inlet, a desulfurization solid waste (SP) discharge port of building material raw materials including gypsum and heavy metal stabilizing compounds and a desulfurization wastewater water (P2) outlet, the desulfurization wastewater pretreatment water pretreatment pool (P2) outlet is connected with a feed port of a waste heat evaporation crystallizer (12B), the inlet of the high-temperature side of the waste heat evaporation crystallizer (12b) is connected with the heated water or steam outlet of the smoke-discharging high-temperature section waste heat recoverer (6), the outlet of the high-temperature side of the waste heat evaporation crystallizer (12b) is connected with the heated water inlet of the smoke-discharging high-temperature section waste heat recoverer (6), the waste heat evaporation crystallizer (12b) is also provided with the discharge hole of industrial-grade sodium chloride (NC) and the outlet of sewage-side secondary steam (Q), the outlet of the sewage-side secondary steam (Q) is connected with the steam inlet of the secondary steam heat recoverer (12c), the secondary steam heat recoverer (12c) is also provided with the water outlet of secondary steam condensate water (QN) and the inlet and outlet of the heated water at the low-temperature side, wherein the inlet of the secondary waste hot water (J1) of the secondary steam heat recoverer (12c) is connected with the process backwater (H2) of the waste heat user heater (10) or the water outlet pipe of heating water (H3), an outlet of secondary waste heat water outlet (J2) of the secondary steam heat recoverer (12c) is communicated with a high-temperature process water return pipe;
and iv, an outlet of high-temperature side outlet water (R2) of the waste heat user heater (10) is connected with a water inlet of a circulating spray device (9c) of the flue gas spray heat exchange purification unit (9), a low-temperature side inlet of the waste heat user heater (10) is communicated with a return water pipe of hot user return water (H0), and an outlet of low-temperature side outlet water (H1) of the waste heat user heater (10) is respectively communicated with a water outlet pipe of process return water (H2) and a water outlet pipe of heating return water (H3).
2. The energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling as claimed in claim 1, wherein a multi-stage washing and condensing heat exchange structure is arranged inside the flue gas spraying heat exchange purification unit (9), and the multi-stage washing and condensing heat exchange structure sequentially comprises the following components from bottom to top: the device comprises a flue gas inlet section (9f), a washing condensation rain area (9e), a washing heat exchanger (9d), a circulating spray device (9c), a demister (9b) and a flue gas outlet section (9a), wherein an outlet of purified flue gas (Y6) at the upper part of the flue gas outlet section (9a) is communicated with the outside atmosphere, and a tower bottom water tank (9g) is arranged at the lower part of the flue gas inlet section (9 f).
3. The energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling as claimed in claim 1, wherein the exhaust smoke high-temperature section waste heat recoverer (6) adopts an extruded aluminum fin heat exchange tube structure coated with a graphene material.
4. The energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling as claimed in claim 2, wherein the washing heat exchanger (9d) is made of a condensation heat exchange material resistant to strong acid and strong base corrosion and resistant to scaling and fouling.
5. The energy-saving and environment-friendly integrated system based on the flue gas waste heat and pollutant cooperative recycling as claimed in claim 1, wherein the concentration component (11b) adopts a nanofiltration membrane, a reverse osmosis membrane or a waste heat method evaporation concentrator structure.
6. The energy-saving and environment-friendly integrated system based on flue gas waste heat and pollutant cooperative recycling as claimed in claim 1, wherein the waste heat evaporation crystallizer (12b) adopts a seed crystal evaporation concentration and salt separation crystallizer structure.
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| CN114314996A (en) * | 2022-03-14 | 2022-04-12 | 伊沃环境科技(南京)有限公司 | Coking wastewater treatment method and device |
| CN115096009A (en) * | 2022-07-01 | 2022-09-23 | 西安交通大学 | Wet desulphurization zero-water-consumption system combined with medium-shallow geothermal energy and working method thereof |
| WO2023173448A1 (en) * | 2022-03-17 | 2023-09-21 | 国网河北省电力有限公司电力科学研究院 | Boiler flue gas evaporation device for high-concentration wastewater at power plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314996A (en) * | 2022-03-14 | 2022-04-12 | 伊沃环境科技(南京)有限公司 | Coking wastewater treatment method and device |
| WO2023173448A1 (en) * | 2022-03-17 | 2023-09-21 | 国网河北省电力有限公司电力科学研究院 | Boiler flue gas evaporation device for high-concentration wastewater at power plant |
| CN115096009A (en) * | 2022-07-01 | 2022-09-23 | 西安交通大学 | Wet desulphurization zero-water-consumption system combined with medium-shallow geothermal energy and working method thereof |
| CN115096009B (en) * | 2022-07-01 | 2023-12-26 | 西安交通大学 | Wet desulfurization zero-water consumption system combining middle-shallow geothermal energy and working method thereof |
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