CN112856446A - Landfill leachate odor mixed burning process and system - Google Patents
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 31
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 39
- 230000023556 desulfurization Effects 0.000 claims abstract description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 11
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
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- 238000010521 absorption reaction Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 230000009615 deamination Effects 0.000 claims description 4
- 238000006481 deamination reaction Methods 0.000 claims description 4
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- 231100000719 pollutant Toxicity 0.000 claims description 4
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical group O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
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- 229910052799 carbon Inorganic materials 0.000 description 2
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- 239000003463 adsorbent Substances 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/008—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for liquid waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/08—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/70—Blending
- F23G2201/702—Blending with other waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/10—Liquid waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
Abstract
The invention provides a landfill leachate odor mixed combustion process and system, wherein the landfill leachate odor mixed combustion system comprises a methane pretreatment system, an odor pretreatment system and an odor mixed combustion system; the outlet of the methane steam-water separation tank is communicated with the inlet of the methane desulfurizing tower; the outlet of the biogas desulfurization tower is communicated with the inlet of the biogas water-sealed tank through a biogas fan; a heating medium outlet of the condenser is communicated with an inlet of the odor steam-water separation tank; the odor gas-water separation tank is respectively communicated with the first odor desulfurization tower and the second odor desulfurization tower; the outlet of the spray tower is communicated with the inlet of the odor water seal tank through an odor fan; the blending combustion burner is arranged at the bottom side of the inside of the incinerator; the outlet of the methane water-sealed tank and the outlet of the odor water-sealed tank are communicated with the inlet of the blending combustion burner; the incinerator is communicated with the chimney, and smoke generated by the incinerator is discharged from the chimney. The system has the advantages of strong impact resistance, simple operation, high effluvium removal efficiency, stable treatment effect and the like.
Description
Technical Field
The invention relates to a landfill leachate odor treatment technology, in particular to a landfill leachate odor mixed burning process and system.
Background
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. Has the characteristics of complex components, high organic matter concentration, high ammonia nitrogen concentration, high heavy metal content, large water quality fluctuation and the like. Along with the prolonging of the landfill time, the organic components in the garbage generate anaerobic decomposition reaction in the landfill to generate odor, and the main component of the odor is H2S and NH3In addition, the volatile of the organic gases such as methyl mercaptan, methylamine and methyl sulfide is large, and part of the gases are toxic and smelly and have large pungent odor.
In the process of treating the landfill leachate, odor in the leachate can be emitted, so that the damage to the surrounding environment and workers is large. The method is characterized in that a certain amount of malodorous gas with pungent smell can be generated in the process of treating the landfill leachate by adopting a core process technology of 'pretreatment + MVR (mechanical vapor recompression) + VP (acid-base scrubbing)', and the method mainly comprises the steps of pretreating odor emitted by the leachate in a water pool and a small amount of high-temperature non-condensable gas generated by an evaporator. The main component of the odor is H2S and NH3And VOCs, which have different odor components and concentrations due to different waste water quality and generation reasons. Currently, the deodorizing processes commonly used include physical, chemical and biological deodorizing methods.
The physical deodorization method is mainly an adsorption method, mainly depends on active carbon and other adsorbents to adsorb odor, and has the advantages of few process units, simple operation, good treatment effect and the like. The main disadvantages are that the active carbon has saturation, needs to be replaced regularly and has high operation cost.
The chemical deodorizing method utilizes the irreversible chemical reaction between the odor components and the main components of the chemical liquid medicine to generate new odorless substances so as to achieve the aim of deodorization, and the main methods comprise a chemical washing method, an ion deodorizing method and the like because the odor components need to be selected correspondingly. The chemical washing method has the advantages of strong impact load resistance, simple operation, convenient maintenance, high absorption rate and the like. The main disadvantages of the process are high consumption of chemicals, high running cost, large amount of generated slurry and secondary treatment for middle and high concentration odor. The ion deodorization method is suitable for treating odor with small scale and medium and low concentration, has low efficiency when treating odor with higher concentration, and has unstable treatment effect and weak impact load resistance.
The biological deodorization method is a process of degrading or converting organic pollutants in odorous gas into harmless or low-harmful substances by using microorganisms. Its main advantage is: the treatment effect is good, and the strict environmental protection requirements all over the world can be met; no secondary pollution is caused; the operation is stable, and the impact load is resisted; the maintenance quantity is small; the energy consumption is low, and the operating cost is low; the assembled tank body is convenient for increasing the treatment capacity when the scale is enlarged in a staged implementation system. The main disadvantages are: high investment, single treatment gas, large occupied area and unstable treatment effect.
Disclosure of Invention
The invention aims to provide a landfill leachate odor mixed combustion system aiming at various problems existing in the existing landfill leachate odor treatment, and the system has the advantages of strong impact resistance, simplicity in operation, high odor removal efficiency, stable treatment effect and the like.
In order to achieve the purpose, the invention adopts the technical scheme that: a landfill leachate odor mixed combustion system comprises a biogas pretreatment system, an odor pretreatment system and an odor mixed combustion system;
the biogas pretreatment system comprises a biogas steam-water separation tank, a biogas desulfurization tower, a biogas fan and a biogas water seal tank, wherein the outlet of the biogas steam-water separation tank is communicated with the inlet of the biogas desulfurization tower (bottom); the outlet of the biogas desulfurization tower (top) is communicated with the inlet of the biogas water-sealed tank through a biogas fan;
the odor pretreatment system comprises a condenser, an odor steam-water separation tank, a first odor desulfurization tower, a second odor desulfurization tower, a spray tower, an odor fan and an odor water seal tank, wherein a heating medium outlet of the condenser is communicated with an inlet of the odor steam-water separation tank; the outlet of the odor gas-water separation tank is communicated with the inlet of a first odor desulfurization tower (bottom); the outlet of the first odor desulfurization tower is communicated with the inlet of a second odor desulfurization tower (bottom); the outlet of the second odor desulfurization tower is communicated with the inlet of the spray tower; the outlet of the spray tower is communicated with the inlet of the odor water-sealed tank through an odor fan;
the odor mixed combustion system comprises a mixed combustion burner, an incinerator and a chimney, wherein the mixed combustion burner is arranged at the bottom side in the incinerator; the outlet of the methane water-sealed tank and the outlet of the odor water-sealed tank are communicated with the inlet of the blending combustion burner; the incinerator is communicated with the chimney, and smoke generated by the incinerator is discharged from the chimney.
Further, the condenser is a plate heat exchanger.
Further, the co-combustion burner is a premixed jet burner.
Further, the incinerator is a vertical incinerator.
The invention also provides a landfill leachate odor mixed burning process, which comprises the following steps: conveying desulfurized biogas to the blending combustion burner through a biogas fan, starting an ignition system to ignite the biogas, conveying desulfurized and deaminated odor to the interior of flame of the blending combustion burner through an odor fan after the biogas is stably combusted, and conveying H2S and NH3And VOCSO in pollutants and odors2The flame is fully mixed with the methane and then combusted, the stink in the stink is removed, and the flue gas generated by the incinerator is discharged through a chimney.
Further, the biogas source is landfill gas in a refuse landfill or biogas generated by a leachate anaerobic treatment process section.
Further, dry desulfurization is adopted for biogas desulfurization and odor desulfurization, and the used desulfurizer is ferric oxide.
Further, the odor deamination adopts a chemical washing method, the used absorption liquid is 1-5% (wt%) of dilute sulfuric acid, and the pH value of the absorption liquid is controlled to be 2-3.
Further, the methane concentration in the biogas ranges from 40-60% (v%).
Further, H in the odor2S content of 200-3，NH3The content is as follows: 100-500mg/m3Methyl mercaptan: 1-10mg/m3Malodor, malodor: 5000-.
Further, the biogas and the odor are mixed in a co-combustion burner, and the co-combustion ratio of the biogas to the odor is 1:1-1:2(v: v).
Further, the flame temperature in the combustion flame is 900-.
The landfill leachate odor blending combustion process and system have the advantages of strong impact resistance, simplicity in operation, high odor removal efficiency, stable treatment effect and the like, the process flow is scientific and reasonable, and compared with the prior art, the landfill leachate odor blending combustion process and system have the following advantages:
1) the landfill leachate odor mixed burning process firstly puts forward the mixed burning technology of high calorific value biogas and low calorific value odor of a landfill to remove odor pollutants, thereby not only eliminating the potential safety hazard caused by the biogas, but also achieving the purpose of removing the odor.
2) The landfill leachate odor blending combustion process removes odor pollutants by using a combustion method, and has the advantages of strong impact capacity of pollution-resistant substance concentration change, thorough reaction and high odor removal rate.
3) The landfill leachate odor mixed combustion system is specially designed for the mixed combustion burner, methane and odor mixed combustion processing is achieved in the burner, the mixed combustion process is generated inside flame, safety of the combustion process is guaranteed, and malodorous components in the odor pass through a high-temperature zone of flame outer flame after participating in combustion reaction, so that the removal rate with higher efficiency is achieved.
4) The front end of the incinerator is desulfurized and deaminated, the reaction condition is mild, and the equipment investment cost is low.
In conclusion, the landfill leachate odor blending combustion process has the advantages of wide application range, strong impact load resistance, strong impact resistance, simple operation, high odor removal efficiency and stable treatment effect, and is suitable for treating landfill leachate odor.
Drawings
Fig. 1 is a schematic view of a landfill leachate odor co-combustion system.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a landfill leachate odor mixed combustion system, the structure of which is shown in fig. 1, and the landfill leachate odor mixed combustion system comprises a biogas pretreatment system, an odor pretreatment system and an odor mixed combustion system, wherein the biogas pretreatment system and the odor pretreatment system are respectively communicated with the odor mixed combustion system.
The biogas pretreatment system comprises a biogas steam-water separation tank 1, a biogas desulfurization tower 2, a biogas fan 3 and a biogas water seal tank 4, wherein the outlet of the biogas steam-water separation tank 1 is communicated with the inlet of the biogas desulfurization tower 2; the outlet of the biogas desulfurization tower 2 is communicated with the inlet of a biogas water seal tank 4 through a biogas fan 3;
the odor pretreatment system comprises a condenser 5, an odor steam-water separation tank 6, a first odor desulfurization tower 7, a second odor desulfurization tower 8, a spray tower 9, an odor fan 10 and an odor water seal tank 11, wherein a heat medium outlet of the condenser 5 is communicated with an inlet of the odor steam-water separation tank 6; an outlet of the odor gas-water separation tank 6 is communicated with an inlet of a first odor desulfurization tower 7; the outlet of the first odor desulfurization tower 7 is communicated with the inlet of a second odor desulfurization tower 8; the outlet of the second odor desulfurization tower 8 is communicated with the inlet of the spray tower 9; the outlet of the spray tower 9 is communicated with the inlet of an odor water seal tank 11 through an odor fan 10;
the odor mixed combustion system comprises a mixed combustion burner 12, an incinerator 13 and a chimney 14, wherein the mixed combustion burner 12 is arranged at the bottom side of the inside of the incinerator 13; the outlet of the methane water-sealed tank 4 and the outlet of the odor water-sealed tank 11 are communicated with the inlet of the blending combustion burner 12; the flue gases produced by the incinerator 13 are discharged through a stack 14.
Example 2
The biogas inlet parameters are as follows: air volume: 800m3/h，CH4The content is as follows: 50% of H2And (2) S content: 100mg/m3Methyl mercaptan: 10mg/m3
Odor gas inlet parameters: air volume: 1200m3/h，H2And (2) S content: 800mg/m3，NH3The content is as follows: 400mg/m3Methyl mercaptan: 5mg/m3Malodor, malodor: 10000 (dimensionless)
By adopting the system, the mixed burning treatment of the odor and the methane comprises the following steps:
the biogas is dehydrated by a biogas steam-water separation tank and then enters a biogas desulfurization tower, the desulfurized biogas enters a biogas fan, the biogas pressurized by the biogas fan is conveyed to an odor water-sealed tank, the biogas after breaking the water seal suddenly enters an blending combustion burner in an incinerator, an ignition system is started to ignite the biogas, and after the biogas is stably combusted, the odor is conveyed to the interior of the flame of the blending combustion burner by the odor fan.
Condensing the high-temperature non-condensable gas at 90 ℃ generated by the evaporation device to 30 ℃ by a condenser, and introducing the condensed gas into an odor steam-water separation tank for dehydration; the odor that non-condensable gas after the dehydration and pretreatment water pool were collected loops through first odor desulfurizing tower and second odor desulfurizing tower and spray column, carry out the desulfurization to the odor in the desulfurizing tower, carry out the deamination to the odor in the spray column, circulation liquid pH control is at 2.5 in the spray column, the odor after desulfurization and deamination gets into the odor fan, the odor after the odor fan pressure boost is carried to odor water seal tank, the odor entering after breaking water seal suddenly mixes the burning combustor and mixes the burning with marsh gas, burn the high temperature flue gas that the burning furnace produced and discharge through 30m chimney. The content of nitrogen oxide in the flue gas discharged from the chimney is 60mg/m3，SO2The content is 70mg/m3The malodor is 500 (dimensionless).
Example 3
The biogas inlet parameters are as follows: air volume: 800m3/h，CH4The content is as follows: 50% of H2And (2) S content: 100mg/m3Methyl mercaptan: 10mg/m3
Odor gas inlet parameters: air volume: 1600m3/h，H2And (2) S content: 400mg/m3，NH3The content is as follows: 200mg/m3Methyl mercaptan: 3mg/m3Malodor, malodor: 8500 (dimensionless)
The method is adopted to mix and burn odor and methane, and the content of nitrogen oxide in the flue gas discharged from a chimney is 40mg/m3，SO2The content is 50mg/m3The malodor is 450 (dimensionless).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A landfill leachate odor mixed combustion system is characterized by comprising a biogas pretreatment system, an odor pretreatment system and an odor mixed combustion system;
the biogas pretreatment system comprises a biogas steam-water separation tank (1), a biogas desulfurization tower (2), a biogas fan (3) and a biogas water seal tank (4), wherein the outlet of the biogas steam-water separation tank (1) is communicated with the inlet of the biogas desulfurization tower (2); the outlet of the biogas desulfurization tower (2) is communicated with the inlet of a biogas water seal tank (4) through a biogas fan (3);
the odor pretreatment system comprises a condenser (5), an odor steam-water separation tank (6), a first odor desulfurization tower (7), a second odor desulfurization tower (8), a spray tower (9), an odor fan (10) and an odor water seal tank (11), wherein a heat medium outlet of the condenser (5) is communicated with an inlet of the odor steam-water separation tank (6); the outlet of the odor gas-water separation tank (6) is communicated with the inlet of a first odor desulfurization tower (7); the outlet of the first odor desulfurization tower (7) is communicated with the inlet of the second odor desulfurization tower (8); the outlet of the second odor desulfurization tower (8) is communicated with the inlet of the spray tower (9); the outlet of the spray tower (9) is communicated with the inlet of an odor water seal tank (11) through an odor fan (10);
the odor mixed combustion system comprises a mixed combustion burner (12), an incinerator (13) and a chimney (14), wherein the mixed combustion burner (12) is arranged at the bottom side of the inside of the incinerator (13); the outlet of the methane water-sealed tank (4) and the outlet of the odor water-sealed tank (11) are communicated with the inlet of the blending combustion burner (12); the incinerator (13) is communicated with the chimney.
2. The landfill leachate odor blending combustion system of claim 1, wherein the condenser is a plate heat exchanger.
3. The landfill leachate odor blending combustion system of claim 1, wherein the blending combustion burner is a premixed jet burner.
4. The landfill leachate odor mixed burning process is characterized by comprising the following steps of: conveying desulfurized biogas to the blending combustion burner through a biogas fan, starting an ignition system to ignite the biogas, conveying desulfurized and deaminated odor to the interior of flame of the blending combustion burner through an odor fan after the biogas is stably combusted, and conveying H2S and NH3And VOCSO in pollutants and odors2The flame is fully mixed with the methane and then combusted, the stink in the stink is removed, and the flue gas generated by the incinerator is discharged through a chimney.
5. The landfill leachate odor blending combustion process of claim 4, wherein the biogas source is landfill gas in a landfill site or biogas generated by a leachate anaerobic treatment process section.
6. The landfill leachate odor blending combustion process as claimed in claim 4, wherein the biogas desulfurization and the odor desulfurization adopt dry desulfurization, and the used desulfurizer is ferric oxide.
7. The landfill leachate odor blending combustion process as claimed in claim 4, wherein the odor deamination is performed by a chemical washing method, the used absorption liquid is 1-5% dilute sulfuric acid, and the pH of the absorption liquid is controlled to be 2-3.
8. The landfill leachate odor blending combustion process according to claim 4, wherein the methane concentration in the biogas is in the range of 40-60%; h in the odor2S content of 200-3，NH3The content is as follows: 100-500mg/m3Methyl mercaptan: 1-10mg/m3Malodor, malodor: 5000-15000.
9. The landfill leachate odor blending combustion process according to claim 4, wherein the biogas and the odor are mixed in a blending combustion burner, and the blending combustion ratio of the biogas and the odor is 1:1-1: 2.
10. The landfill leachate odor blending combustion process as claimed in claim 4, wherein the combustion flame inner flame temperature is 900-.
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| CN114110626A (en) * | 2021-10-15 | 2022-03-01 | 中创水务科技环保(广东)有限公司 | Method for treating landfill leachate MVR non-condensable gas by ground torch co-firing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005028211A (en) * | 2003-07-07 | 2005-02-03 | Gifu Prefecture | Method and apparatus for treating malodorous gas |
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