CN112915742B - Method for realizing zero discharge of waste water of whole plant of waste incineration power plant - Google Patents
Method for realizing zero discharge of waste water of whole plant of waste incineration power plant Download PDFInfo
- Publication number
- CN112915742B CN112915742B CN202110080337.8A CN202110080337A CN112915742B CN 112915742 B CN112915742 B CN 112915742B CN 202110080337 A CN202110080337 A CN 202110080337A CN 112915742 B CN112915742 B CN 112915742B
- Authority
- CN
- China
- Prior art keywords
- pipe
- injection
- flue gas
- percolate
- pulping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/02—Separation 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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation 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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
- B01D2258/0291—Flue gases from waste incineration plants
-
- 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
- C02F2103/06—Contaminated groundwater or leachate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method for zero discharge of waste water of a whole plant of a waste incineration power plant, which relates to the technical field of treatment of landfill leachate, and adopts the technical scheme that: s1, reverse osmosis, namely performing reverse osmosis treatment on the percolate; s2, pulping, namely mixing and stirring slaked lime powder in a slaked lime pulping powder bin and percolate concentrated water to prepare slaked lime slurry; s3, flue gas treatment, namely carrying out contact reaction on the atomized slaked lime slurry and high-temperature flue gas to form mixed flue gas; s4, absorbing, namely mixing and contacting the mixed flue gas with an absorbent to neutralize acidic substances in the mixed flue gas and absorb particle pollution in the mixed flue gas; and S5, removing dust by using a bag-type dust remover to obtain clean tail gas. Compared with the prior art, the method reduces the discharge of waste water, applies the percolate to a subsequent flue gas purification treatment system of the waste incineration power plant, achieves the zero discharge of waste water of the whole waste incineration power plant, and saves the use of process water of the plant area.
Description
Technical Field
The invention relates to the technical field of landfill leachate treatment, in particular to a method for realizing zero discharge of waste water of a whole plant of a waste incineration power plant.
Background
At present, municipal refuse treatment begins to go on through the mode of msw incineration electricity generation, can burn on the one hand and generate heat and obtain partly electric energy, and on the other hand can also dwindle the volume of rubbish greatly through burning, utilizes subsequent landfill, reaches to burn completely even idealistically and need not the landfill, has better treatment effect for traditional direct landfill mode.
The water content and the organic component content of the municipal solid waste are high, and in the process of carrying out waste incineration power generation treatment, the organic components in the waste pile are subjected to complex organic degradation and are gathered with the water in the waste pile to form a large amount of percolate. The landfill leachate has high ammonia nitrogen content, chemical oxygen demand and various toxic and harmful components, contains a large amount of organic components and toxic and harmful impurities, and can be discharged in the environment only after being further treated to reach the standard. After the leachate of the partial waste incineration power plant is treated by the traditional waste water treatment system, 15% -30% of leachate concentrated water is generated, the part of wastewater needs to be discharged outside the plant, the natural environment is still polluted and damaged greatly, and the treatment of the part of leachate becomes pain points and difficulties in the waste treatment industry.
The Chinese patent application with the publication number of CN110397940A discloses a process for treating landfill leachate by high-temperature incineration, which comprises a preheating system, an evaporative crystallization system, a phase-change heat storage system and an incineration system, and is characterized in that the process comprises a starting stage S1, a feeding stage S2 and a circulating stage S3, a large amount of latent heat and sensible heat in evaporative moisture discharged by evaporation are recovered by the combined use of phase-change heat storage and sensible heat storage, the recovered heat energy is continuously returned to the system for treating the leachate, and the effect of heat recovery and utilization in the whole treatment process can be improved. However, in the treatment process of the percolate, the percolate needs to be additionally heated and incinerated by an incinerator, and the incineration process generates large incineration pollution and energy consumption.
Therefore, a new solution is needed to solve this problem.
Disclosure of Invention
The invention aims to solve the problems and provide a method for realizing the zero discharge of the wastewater of the whole waste incineration power plant.
The technical purpose of the invention is realized by the following technical scheme: a method for realizing zero discharge of waste water of a whole waste incineration power plant comprises the following steps:
s1, in a reverse osmosis stage, the landfill leachate is permeated through a reverse osmosis membrane to obtain leachate concentrated water with the quality of 15-30% of the raw water;
s2, in the pulping stage, pulping is carried out through a pulping system, and slaked lime powder in a slaked lime pulping powder bin and percolate concentrated water are mixed and stirred to prepare slaked lime slurry;
s3, in a flue gas treatment stage, atomizing the slaked lime slurry by using a rotary atomizer, introducing atomized liquid drops into a reaction system, enabling the atomized liquid drops to be in contact with high-temperature flue gas, cooling the high-temperature flue gas, and heating and evaporating penetration liquid in the atomized liquid drops to form mixed flue gas;
s4, an absorption stage, namely mixing and contacting the mixed flue gas with slaked lime powder and activated carbon powder, neutralizing acidic substances in the mixed flue gas, and absorbing particle pollution in the mixed flue gas;
and S5, in the dust removal stage, the mixed flue gas is subjected to dust removal through a bag-type dust remover, and particulate matter impurities in the mixed flue gas are captured.
The invention is further set that before the S1 reverse osmosis stage, the garbage percolate is treated with wastewater; the reverse osmosis membrane is a DTRO reverse osmosis membrane, and the obtained leachate concentrated water is stored through a leachate storage system.
The invention is further configured that the percolate storage system comprises a percolate storage tank, a percolate pipe is connected to the percolate storage tank, a percolate pumping device is arranged on the percolate pipe, and the percolate pumping device comprises a percolate delivery pump.
The invention is further arranged that in the S2 pulping stage, the concentration of the slaked lime slurry is between 10% and 20%.
The invention is further set that the pulping system comprises a pulping powder bin, a pulping tank and a pulp storage tank, wherein the pulping tank and the pulp storage tank are both protected against corrosion by carbon steel lining glass flakes; the pulping tank is communicated with the leachate storage tank through a leachate pipe, the pulp storage tank is communicated with the pulping tank, the pulping tank is connected with a slurry pipe, a lime slurry pumping device is arranged on the slurry pipe and comprises at least two lime slurry pumps connected in parallel, impellers of the lime slurry pumps are made of high-chromium alloy, stirring paddles are arranged in the pulping tank and the pulp storage tank, and the stirring paddles are made of carbon steel lining glue and are corrosion-resistant.
The invention is further arranged in that the reaction system comprises a reaction tower and a rotary atomizer, the rotary atomizer is arranged at the top of the reaction tower, the spraying end of the rotary atomizer extends into the reaction tower, the inlet end of the rotary atomizer is connected with a slurry storage tank through a slurry pipe, and the contact part of the rotary atomizer and the slurry adopts Hastelloy.
The invention is further provided that the rotating speed of the rotary atomizer is 13500rpm, and the atomized particle size is 20-50 μm.
The invention is further provided that the inner cavity of the reaction tower is provided with a spraying device which is communicated with the percolate storage tank through a percolate pipe.
The invention is further set that the dust removal system comprises a bag-type dust remover, the inlet end of the bag-type dust remover is communicated with the flue gas outlet of the reaction tower through a flue pipe, and the outlet end of the bag-type dust remover is communicated with a chimney through an induced draft fan.
The invention is further arranged that in the S4 absorption stage, the mixed flue gas is mixed and contacted with the slaked lime powder and the activated carbon powder through two groups of absorbent injection systems, and the two groups of absorbent injection systems are connected to the smoke tube and are respectively used for injecting the activated carbon and the slaked lime into the smoke tube; the two groups of absorbent injection systems respectively comprise an injection device, an injection pipe, an injection fan and an injection storage bin, one end of the injection pipe is connected with the smoke pipe, the other end of the injection pipe is connected with the injection fan, the injection device is connected into the injection pipe, and the injection storage bin is communicated with the injection pipe through the injection device.
In conclusion, the invention has the following beneficial effects:
the concentrated leachate is applied to a subsequent flue gas purification treatment system of a waste incineration power plant, and the leachate is heated and evaporated by high-temperature flue gas; compared with the existing percolate concentrated water treatment technology, the method reduces the discharge of the whole waste water, applies percolate concentrated solution to a subsequent flue gas purification treatment system of a waste incineration power plant, achieves the zero discharge of the whole waste water of the waste incineration power plant, and saves the use of plant area process water.
Drawings
FIG. 1 is a schematic structural diagram of a method for zero discharge of wastewater from a whole waste incineration power plant according to the present invention;
fig. 2 is a schematic structural diagram of a spraying device of the spraying system of the invention.
Reference numerals: 1. rotating the atomizer; 2. a reaction tower; 3. a pulping powder bin; 4. a pulping tank; 5. a slurry storage tank; 6. a lime slurry pump; 7. a percolate storage tank; 8. a percolate delivery pump; 9. a bag-type dust collector; 10. activated carbon injection storage; 11. an activated carbon injection fan; 12. an activated carbon injection device; 13. slaked lime injection storage; 14. a slaked lime injection fan; 15. a slaked lime injection device; 16. an induced draft fan; 17. a chimney; 18. a spraying device; 19. a percolate tube; 20. a slurry pipe; 21. a smoke pipe; 22. an injection pipe; 200. a second regulating valve; 201. an outer tube; 202. a necking pipe; 203. an ejection chamber; 204. a material pipe; 205. an injection hole; 206. a balance tube; 207. a balance hole; 208. adjusting a valve I; 209. and (4) branch pipes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
The embodiment discloses a waste water zero discharge system of a whole plant of a waste incineration power plant, please refer to fig. 1 and fig. 2, which includes a leachate storage system, a pulping system, a reaction system, a dust removal system and an absorbent injection system, wherein leachate concentrated water is supplied to the pulping system through the leachate storage system for pulping without consuming process water, the prepared slaked lime slurry is atomized to form slurry fog drops, the slurry fog drops are sprayed to the reaction system, water in the slurry is dried through high temperature of smoke in the reaction system to form solid particles, slaked lime and an active carbon absorbent are injected through the injection system to neutralize and adsorb impurities such as acid pollution in the dried smoke, the dust removal system is used for filtering to finally obtain clean tail gas, leachate is completely evaporated, and acid substances in the smoke are removed, so that the waste water zero discharge of the whole plant of the waste water of the waste incineration power plant is realized.
The percolate storage system comprises a percolate storage tank 7, a percolate pipe 19 is connected to the percolate storage tank 7, a percolate pumping device is arranged on the percolate pipe 19 and comprises at least two percolate conveying pumps 8 connected in parallel, and the two percolate conveying pumps 8 can ensure stable pumping of percolate and continuous and stable work of equipment;
the pulping system comprises a pulping powder bin 3, a pulping tank 4 and a pulp storage tank 5, wherein the pulping powder bin 3 can store slaked lime and is periodically conveyed into the pulping powder bin 3 through a vehicle; the slurry powder bin and the slurry making tank 4 are connected through a spiral feeder for conveying; the pulping tank 4 is communicated with the percolate storage tank 7 through a percolate pipe 19, percolate can be conveyed into the pulping tank 4 through the pumping of the percolate conveying pump 8 to replace process water which is originally required to be used, and the slaked lime slurry with the concentration of 10-20% is formed through stirring by the stirring slurry in the pulping tank 4;
the pulping tank 4 and the pulp storage tank 5 are protected against corrosion by carbon steel lining glass flakes, and the stirring pulp is protected against corrosion by carbon steel lining rubber.
The pulp storage tank 5 is communicated with the pulping tank 4, the pulp flows into the pulp storage tank 5 through the self weight of the pulp to be stored, and the pulp storage tank 5 is also provided with a stirring paddle, so that the pulp can be kept uniform and stable through stirring; the slurry making tank 4 is connected with a slurry pipe 20, a lime slurry pumping device is installed on the slurry pipe 20, the slurry pipe 20 is corrosion-resistant by adopting carbon steel lining rubber, the lime slurry pumping device adopts two lime slurry pumps 6 which are connected in parallel, impellers of the lime slurry pumps 6 adopt high-chromium alloy, the two lime slurry pumps 6 can work respectively, and the lime slurry can be transported stably and reliably.
The reaction system is mainly used for contact reaction of high-temperature flue gas and lime slurry, and mainly comprises a reaction tower 2 and a rotary atomizer 1, wherein the top of the reaction tower 2 is provided with a flue gas inlet, the lower part of the reaction tower 2 is provided with a flue gas outlet, and the flue gas forms upward and downward circulation in the reaction tower 2; the bottom of the reaction tower 2 is connected with an emptying pipe, and the emptying pipe continuously operates when the equipment operates, so that accumulated liquid and dust possibly remained at the bottom of the reaction tower 2 are discharged, and the maintenance and the cleaning are facilitated.
The inlet end of the rotary atomizer 1 is connected with a slurry pipe 20 and is also communicated with a percolate storage tank 7 through a percolate pipe 19, the slurry pipe 20 can convey lime slurry to the atomizing rotator, the contact part of the rotary atomizer 1 and the slurry adopts Hastelloy for corrosion prevention, a certain amount of percolate is added through the percolate pipe 19 according to the running condition of the atomizing rotator and the thick condition of the lime slurry, and stable atomization of the lime slurry is ensured; the atomizing rotator can rotate at high speed, slurry is stretched into a film or drawn into filaments under the action of centrifugal force, the thin film or the filaments are broken and dispersed into droplets at the edge of the atomizing disc, the rotating speed of the atomizer is 13500rpm, and the atomized particle size is 20-50 microns.
The rotary atomizer 1 is arranged at the top of the reaction tower 2, the spraying end of the rotary atomizer extends into the reaction tower 2, atomized liquid drops can be sprayed into the reaction tower 2 and are contacted with high-temperature flue gas, percolate in the lime slurry liquid drops can be completely evaporated under the action of high temperature, and acidic substances in the flue gas are neutralized by the lime slurry and are dried to form solid particles.
In order to facilitate the adjustment of the reaction condition in the reaction tower 2, a spraying device 18 is arranged in the middle of an inner cavity of the reaction tower 2, the spraying device 18 can be a plurality of nozzles, the spraying device 18 is communicated with a percolate storage tank 7 through a percolate pipe 19, a filter, a valve and other accessory equipment are arranged, certain percolate is sprayed into the reaction tower 2 through a pump, the flue gas can be sprayed, the reaction temperature in the reaction tower 2 is adjusted, the percolate can be properly sprayed when the temperature is higher, and the drying treatment of the percolate is accelerated.
The dust removal system comprises a bag-type dust remover 9, and can be constructed by adopting a mode of connecting and combining a plurality of groups of bag-type dust removers 9 according to the dust removal requirement, the inlet end of the bag-type dust remover 9 is communicated with the flue gas outlet of the reaction tower 2 through a flue pipe 21, and the outlet end of the bag-type dust remover 9 is communicated with a chimney 17 through an induced draft fan 16 to discharge the cleaned tail gas.
The waste water zero discharge system also comprises two groups of absorbent injection systems, wherein the two groups of absorbent injection systems are connected to the smoke tube 21 and are respectively used for injecting activated carbon and slaked lime into the smoke tube 21, possible acidic pollutants in the smoke tube 21 can be absorbed and neutralized through slaked lime powder, and the activated carbon powder can absorb pollutants such as peculiar smell, small particle impurities, dust and the like in the smoke and is attached to and absorbed on the activated powder, so that the subsequent cloth bag dust removal is facilitated;
the active carbon has a large specific surface area, and when the active carbon is sprayed and adsorbed, the pollutants and the slaked lime powder can be adsorbed on the surface of active carbon particles, so that the pollutants in the slaked lime powder and the flue gas can be supplied to a larger and more stable contact reaction area, the adsorption and neutralization of the slaked lime powder on the impurities such as acid pollutants in the pollutants are improved, and the effect of accelerating the reaction absorption efficiency is achieved.
The two groups of absorbent injection systems respectively comprise an injection device, an injection pipe 22, an injection fan and an injection storage bin, the two groups of absorbent injection systems are respectively a slaked lime injection system and an active carbon injection system according to different injection objects of the two groups of absorbent injection systems, the slaked lime injection system comprises a slaked lime injection device 15, a slaked lime injection pipe 22, a slaked lime injection fan 14 and a slaked lime injection storage bin 13, and the active carbon injection system comprises an active carbon injection device 12, an active carbon injection pipe 22, an active carbon injection fan 11 and an active carbon injection storage bin 10.
The two groups of injection systems have basically the same structure, one end of the injection pipe 22 is connected with the smoke pipe 21, the other end of the injection pipe is connected with the injection fan, the injection device is connected into the injection pipe 22, the injection storage bin is communicated with the injection pipe 22 through the injection device, the injection device is a Venturi injection structure, and the absorbent is mixed into the airflow of the injection pipe 22 through Venturi effect adsorption and is injected;
the injection device specifically comprises an outer pipe 201, a reducing pipe 202 and a material pipe 204, wherein the two ends of the outer pipe 201 are connected with the injection pipes 22, the reducing pipe 202 is of a structure with two large ends and a small middle, the outer diameters of the two ends of the reducing pipe 202 are consistent with the inner diameter of the outer pipe 201, and the reducing pipe is arranged inside the outer pipe 201, so that an annular injection cavity 203 is formed between the outer wall of the middle section of the reducing pipe 202 and the inner wall of the outer pipe 201, and the narrow pipe wall in the middle of the reducing pipe 202 is provided with an injection hole 205 which is communicated with the injection cavity 203 and the inner cavity of the reducing pipe 202; a material pipe 204 is connected to the position of the outer pipe 201 corresponding to the injection cavity 203, and the other end of the material pipe 204 is connected with the injection storage bin; when the airflow of the injection fan flows through the outer pipe 201 and the throat pipe 202, because the caliber of the throat pipe 202 is reduced, a venturi effect is generated at the throat pipe 202, the flow rate of the flue gas at the throat section of the throat pipe 202 is increased, the pressure is reduced, the absorbent enters the throat pipe 202 from the injection storage bin along the material pipe 204, the injection cavity 203 and the injection holes 205 through negative pressure, and then enters the smoke pipe 21 to perform contact reaction with the flue gas in the smoke pipe 21 along with the circulation of the airflow of the injection fan.
In order to adjust the adsorption injection amount of the absorbent, a balance pipe 206 is arranged in the venturi mechanism, the balance pipe 206 is installed in the outer pipe 201 through a bracket, one end of the balance pipe 206 extends into the inner cavity of the throat section of the throat pipe 202, the other end extends towards the air inlet end of the injection fan, and balance holes 207 are formed in the side walls of the two ends of the balance pipe 206, so that when the venturi mechanism generates a venturi effect, the airflow velocity at the two ends of the balance pipe 206 has a certain difference to form a pressure difference, a part of the airflow circulates through the balance pipe 206 and enters the throat pipe 202, the pressure balance adjustment can be performed in the balance pipe 206, the balance pipe 206 in the throat pipe 202 can eject the balance airflow outwards to generate an opposite impact with absorbent powder ejected from the injection hole 205, and the contact mixing of the balance pipe 206 and the absorbent powder is intensified;
the first adjusting valve 208 can be installed on the balance pipe 206, and the first adjusting valve 208 can adjust the flow of the balance pipe 206 and adjust the pressure balancing effect of the balance pipe 206, so as to adjust the proportion of the amount of the flue gas and the material absorbed by the venturi effect in the throat pipe 202.
In order to further increase the balance effect of the balance pipe 206, a branch pipe 209 can be connected to the middle section of the balance pipe 206, the branch pipe 209 is communicated with an external pressure air source, a second regulating valve 200 is mounted on the branch pipe 209 to regulate and control the flow of the branch pipe 209, so that the supplementary pressure in the balance pipe 206 can be further increased, the internal pressure of the balance pipe 206 can be increased or negative pressure can be regulated, and under the condition that the first regulating valve 208 is closed, the pressure control of the balance pipe 206 in the necking pipe 202 can be actively regulated through the branch pipe 209, so that the absorbent sprayed in the spraying hole 205 can be regulated, and the material spraying condition of a venturi structure can be increased; in order to avoid the absorbent from entering the balance pipe 206 by mistake, a filter screen may be disposed on the balance hole 207 to block the absorbent particles, and high-pressure gas is periodically introduced into the balance pipe 206 to blow off and remove the absorbent particles attached to the filter screen, thereby maintaining the smoothness of the balance hole 207.
The concentrated leachate water is recycled, so that process water required in flue gas treatment is saved, lime slurry is prepared, the leachate is completely evaporated by adopting the processes of rotary atomization, a semi-dry method, cloth bag dust removal and the like, the solidified pollutants are absorbed, neutralized and removed by an absorbent and captured and collected by a subsequent cloth bag dust remover 9, relatively clean tail gas is obtained, and the zero emission of the wastewater of the whole plant of the waste incineration power plant is realized.
Example two
The embodiment discloses a method for zero discharge of waste water of a whole waste incineration power plant, which is implemented by adopting a waste water zero discharge system of the whole waste incineration power plant in the first embodiment and comprises the following steps:
s1, performing reverse osmosis, namely performing wastewater treatment on the landfill leachate, performing osmosis through a DTRO reverse osmosis membrane to obtain leachate concentrated water with the raw water mass of 15-30%, and storing the obtained leachate concentrated water in a leachate storage tank 7;
s2, in the pulping stage, pulping is carried out through a pulping system, and slaked lime powder is transported to a slaked lime pulping powder bin 3 by a sealed tank car for temporary storage; during pulping, adding slaked lime powder in a slaked lime pulping powder bin 3 and percolate concentrated water into a lime slurry preparation tank, mixing and stirring to prepare slaked lime slurry with the concentration of 10-20%; after stirring and mixing evenly, conveying the slaked lime slurry into a practical slurry storage tank for storage for later use;
s3, in the flue gas treatment stage, mixing and reacting the high-temperature flue gas and the slaked lime slurry through a reaction system; the slaked lime slurry pump 6 conveys the slaked lime slurry into the rotary atomizer 1 rotating at high speed, the rotating speed of the atomizer is 13500rpm, the slurry is extended into a film or pulled into filaments under the action of centrifugal force, the film or the filaments are broken and dispersed into droplets at the edge of an atomizing disc of the rotary atomizer 1, and the atomizing particle size is between 20 and 50 mu m;
introducing the atomized liquid drops into the reaction tower 2, so that the atomized liquid drops are contacted with the high-temperature flue gas, the high-temperature flue gas is cooled, the penetration liquid in the atomized liquid drops is completely evaporated by heating, and solid particles are formed and mixed in the flue gas to form mixed flue gas; acidic substances in the flue gas are neutralized and removed by the atomized liquid drops;
spraying the percolate into the reaction tower 2 according to the temperature of the flue gas reaction, adjusting the temperature in the reaction tower 2, and simultaneously directly evaporating a part of percolate;
s4, an absorption stage; the mixed flue gas is mixed and contacted with slaked lime powder and activated carbon powder through an absorbent injection system, the slaked lime powder can absorb and neutralize acid pollutants possibly existing in the flue pipe 21, and the activated carbon powder can absorb pollutants such as peculiar smell, small particle impurities and dust in the flue gas and attach and absorb the pollutants on the activated powder, so that subsequent cloth bag dust removal is facilitated;
the active carbon has a larger specific surface area, and pollutants and slaked lime powder can be adsorbed on the surfaces of active carbon particles during injection adsorption, so that the pollutants in the slaked lime powder and flue gas can have a larger and more stable contact reaction area, the adsorption and neutralization of the slaked lime powder to impurities such as acid pollutants in the pollutants are improved, and the effect of accelerating the reaction absorption efficiency is achieved;
and S5, in the dust removal stage, the mixed flue gas is subjected to dust removal through a bag-type dust remover 9 in a dust removal system, particulate matter impurities in the mixed flue gas are captured, relatively clean flue gas tail gas is formed, and the flue gas tail gas is finally discharged through a chimney 17.
Compared with the existing percolate concentrated water treatment technology, the method reduces the discharge of the whole waste water, applies percolate concentrated solution to a subsequent flue gas purification treatment system of a waste incineration power plant, achieves the zero discharge of the whole waste water of the waste incineration power plant, and saves the use of plant area process water. Taking the designed value of the garbage in a certain garbage incineration power plant as 1000t/d for example, about 40% of leachate is generated in the whole plant, about 400t/d, leachate concentrated water is generated after the leachate concentrated water passes through a leachate wastewater treatment system, the leachate concentrated water is 60t/d, the part of wastewater is completely and comprehensively utilized, 60t of wastewater discharge can be reduced every day, and accordingly 60t of process water is saved every day.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A method for realizing zero discharge of waste water of a whole waste incineration power plant comprises the following steps:
s1, in a reverse osmosis stage, the landfill leachate is permeated through a reverse osmosis membrane to obtain leachate concentrated water with the quality of 15-30% of the raw water;
s2, in the pulping stage, pulping is carried out through a pulping system, and slaked lime powder in a slaked lime pulping powder bin (3) and percolate concentrated water are mixed and stirred to prepare slaked lime slurry;
s3, in a flue gas treatment stage, the slaked lime slurry is atomized through the rotary atomizer (1), atomized liquid drops are introduced into a reaction system, the atomized liquid drops are contacted with high-temperature flue gas, the high-temperature flue gas is cooled, and percolate in the atomized liquid drops is heated and evaporated to form mixed flue gas;
s4, an absorption stage, namely mixing and contacting the mixed flue gas with slaked lime powder and activated carbon powder, neutralizing acidic substances in the mixed flue gas, and absorbing particle pollution in the mixed flue gas;
s5, in the dust removal stage, the mixed flue gas is subjected to dust removal through a bag-type dust remover (9) to capture particulate impurities in the mixed flue gas;
the inlet end of the bag-type dust collector (9) is communicated with the smoke outlet of the reaction tower (2) through a smoke pipe (21), and the outlet end of the bag-type dust collector (9) is communicated with a chimney (17) through an induced draft fan (16);
in the S4 absorption stage, the mixed flue gas is mixed and contacted with slaked lime powder and activated carbon powder through two groups of absorbent injection systems, and the two groups of absorbent injection systems are connected to the smoke pipe (21) and are respectively used for injecting the activated carbon and the slaked lime into the smoke pipe (21); the two groups of absorbent injection systems respectively comprise an injection device, an injection pipe (22), an injection fan and an injection storage bin, one end of the injection pipe (22) is connected with the smoke pipe (21), the other end of the injection pipe is connected with the injection fan, the injection device is connected into the injection pipe (22), and the injection storage bin is communicated with the injection pipe (22) through the injection device;
the injection device comprises an outer pipe (201), a necking pipe (202) and a material pipe (204), wherein the two ends of the outer pipe (201) are connected into injection pipes (22), the necking pipe (202) is of a structure with two large ends and a small middle part, the outer diameters of the two ends of the necking pipe (202) are consistent with the inner diameter of the outer pipe (201) and are arranged inside the outer pipe (201), an annular injection cavity (203) is formed between the outer wall of the middle section of the necking pipe (202) and the inner wall of the outer pipe (201), an injection hole (205) is formed in the narrower pipe wall in the middle of the necking pipe (202), and the injection cavity (203) is communicated with the inner cavity of the necking pipe (202); the outer pipe (201) is connected with a material pipe (204) corresponding to the position of the injection cavity (203), and the other end of the material pipe (204) is connected with an injection storage bin;
the injection device further comprises a balance pipe (206), the balance pipe (206) is installed in the outer pipe (201) through a support, one end of the balance pipe (206) extends into the inner cavity of the necking section of the necking pipe (202), the other end of the balance pipe extends towards the air inlet end of the injection fan, and balance holes (207) are formed in the side walls of the two end positions of the balance pipe (206); when the device works, air flows at two ends of the balance pipe (206) form pressure difference, part of the air flows pass through the balance pipe (206) to flow into the reducing pipe (202), and the balance pipe (206) in the reducing pipe (202) can eject the balance air flow outwards to generate opposite impact with absorbent powder ejected from the ejection hole (205) so as to intensify contact and mixing with the powder.
2. The method for zero discharge of wastewater from a whole plant of a waste incineration power plant as claimed in claim 1, wherein the step of performing wastewater treatment on the landfill leachate before the step of performing reverse osmosis on the S1; the reverse osmosis membrane is a DTRO reverse osmosis membrane, and the obtained leachate concentrated water is stored through a leachate storage system.
3. The method for zero discharge of wastewater from a whole plant of a refuse incineration power plant according to claim 2, characterized in that the percolate storage system comprises a percolate storage tank (7), a percolate pipe (19) is connected to the percolate storage tank (7), and a percolate pumping device is arranged on the percolate pipe (19), and the percolate pumping device comprises a percolate delivery pump (8).
4. The method for zero discharge of waste water of a whole waste incineration power plant as claimed in claim 1, wherein in the S2 pulping stage, the concentration of the slaked lime slurry is 10% -20%.
5. The method for zero discharge of wastewater of a whole plant of a waste incineration power plant according to claim 4, characterized in that the pulping system comprises a pulping powder bin (3), a pulping tank (4) and a pulp storage tank (5), and the pulping tank (4) and the pulp storage tank (5) are both protected from corrosion by carbon steel lining glass flakes; the pulping tank (4) is communicated with the leachate storage tank (7) through a leachate pipe (19), the pulp storage tank (5) is communicated with the pulping tank (4), the pulping tank (4) is connected with a slurry pipe (20), a lime slurry pumping device is arranged on the slurry pipe (20), the lime slurry pumping device comprises at least two parallel lime slurry pumps (6), impellers of the lime slurry pumps (6) adopt high-chromium alloy, stirring paddles are arranged in the pulping tank (4) and the pulp storage tank (5), and the stirring paddles adopt carbon steel lining rubber for corrosion prevention.
6. The method for zero discharge of waste water in a whole plant of a waste incineration power plant according to claim 1, wherein the reaction system comprises a reaction tower (2) and a rotary atomizer (1), the rotary atomizer (1) is arranged at the top of the reaction tower (2), the spraying end of the rotary atomizer (1) extends into the reaction tower (2), the inlet end of the rotary atomizer (1) is connected with a slurry storage tank (5) through a slurry pipe (20), and the slurry contact part of the rotary atomizer (1) and the slurry adopts Hastelloy.
7. The method for zero discharge of wastewater from a whole plant of a refuse-fired power plant according to claim 6, characterized in that the rotating speed of the rotary atomizer (1) is 13500rpm, and the atomized particle size is 20-50 μm.
8. The method for realizing the zero discharge of the wastewater of the whole plant of the waste incineration power plant as claimed in claim 6, characterized in that a spraying device (18) is arranged in the inner cavity of the reaction tower (2), and the spraying device (18) is communicated with the percolate storage tank (7) through a percolate pipe (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080337.8A CN112915742B (en) | 2021-01-21 | 2021-01-21 | Method for realizing zero discharge of waste water of whole plant of waste incineration power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080337.8A CN112915742B (en) | 2021-01-21 | 2021-01-21 | Method for realizing zero discharge of waste water of whole plant of waste incineration power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112915742A CN112915742A (en) | 2021-06-08 |
| CN112915742B true CN112915742B (en) | 2022-10-18 |
Family
ID=76163826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110080337.8A Active CN112915742B (en) | 2021-01-21 | 2021-01-21 | Method for realizing zero discharge of waste water of whole plant of waste incineration power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112915742B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203373235U (en) * | 2013-04-03 | 2014-01-01 | 光大环保能源(常州)有限公司 | Thick water processing system for garbage leachate |
| CN106587225A (en) * | 2016-12-07 | 2017-04-26 | 浙江德创环保科技股份有限公司 | Zero discharge process for desulfurization wastewater |
| CN107473303B (en) * | 2017-08-16 | 2020-12-29 | 北京姚魏环保技术有限公司 | Leachate zero-discharge collaborative ultralow system and method based on waste incineration power generation |
| CN109925869A (en) * | 2019-04-12 | 2019-06-25 | 洁华控股股份有限公司 | Flue gas of refuse burning high-efficient purification processing method |
| CN110715297A (en) * | 2019-10-15 | 2020-01-21 | 武汉丰盈能源技术工程有限公司 | Harmless treatment system and method for plasma gasification furnace and waste incineration power plant |
-
2021
- 2021-01-21 CN CN202110080337.8A patent/CN112915742B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112915742A (en) | 2021-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107032428B (en) | System and method for zero emission treatment of undersaturated flue gas concentration crystallization desulfurization wastewater | |
| CN102120130B (en) | Complete set of device and method for treating tail gas from sludge incineration through semidry method | |
| CN107115967B (en) | Temperature/wet regulation more field strength Combined Electrostatic dust pelletizing system | |
| CN108006683A (en) | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas | |
| CN208008493U (en) | A kind of equipment that flue residue heat is used for Waste Water From Fire Power Plant zero discharge treatment | |
| CN109945211B (en) | Burning treatment method and system for semi-coke pyrolysis waste gas and waste liquid | |
| CN206486391U (en) | A kind of desulfurization wastewater zero-emission couples damping Improvement of dust removal system | |
| CN214693719U (en) | Device of waste water zero release of waste incineration power plant whole factory | |
| CN201899980U (en) | Complete device for treating sludge incineration tail gas in semidry method | |
| CN104001414B (en) | A kind of tail gas biochemical processing method and system | |
| CN107176742A (en) | A kind of desulfurization wastewater rotational flow dust-removing method | |
| CN110454802A (en) | The concentrate for reducing nitrous oxides concentration in furnace enters furnace and returns spray system and return spray method | |
| CN207797091U (en) | A kind of device for realizing desulfurization wastewater zero-emission using full flue gas | |
| CN112915742B (en) | Method for realizing zero discharge of waste water of whole plant of waste incineration power plant | |
| CN206810054U (en) | A kind of pre- desulfurization of coal-burning power plant's flue gas and the device of desulfurization wastewater drying crystalline | |
| CN112791559B (en) | System for waste water zero release of refuse burning power plant whole factory | |
| CN112320876A (en) | Salt-containing wastewater evaporation and concentration process and system | |
| CN114392645A (en) | High concentration organic waste gas treatment, recycling and reusing system | |
| CN206824016U (en) | A kind of Combined Electrostatic dust pelletizing system of temperature/more field strength of wet regulation and control | |
| CN116293721A (en) | Noble metal incineration and tail gas purification process | |
| CN206375693U (en) | The humidifier and flue spray evaporation device of good antiscale property | |
| CN211946337U (en) | Intelligent waste water zero discharge coupling dechlorination system utilizing waste heat of flue gas | |
| CN2467146Y (en) | Multifunction evaporation tower | |
| CN207958027U (en) | It is a kind of using spray column as the desulfurization wastewater drying energy saving emission-reducing system of feeding chamber | |
| CN108046499B (en) | Desulfurization waste water drying energy-saving and emission-reducing system with spray tower as feeding bin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |