CN108405549B - Method and device for preventing and treating scaling blockage of refuse landfill by utilizing furnace slag and landfill gas - Google Patents
Method and device for preventing and treating scaling blockage of refuse landfill by utilizing furnace slag and landfill gas Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 58
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000011049 filling Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000010813 municipal solid waste Substances 0.000 abstract description 16
- 238000000746 purification Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 119
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 30
- 229910001424 calcium ion Inorganic materials 0.000 description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 21
- 229910002092 carbon dioxide Inorganic materials 0.000 description 17
- 238000002386 leaching Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000004056 waste incineration Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000011575 calcium Substances 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
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- KDRIEERWEFJUSB-UHFFFAOYSA-N carbon dioxide;methane Chemical compound C.O=C=O KDRIEERWEFJUSB-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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Abstract
The invention discloses a method for preventing and treating scaling blockage of a refuse landfill by utilizing slag and landfill gas, and a bagThe method comprises the following steps: 1) discharging the slag into a treatment room, and sealing the treatment room; 2) reacting the landfill gas with the slag; 3) detecting CO in the gas at the outlet2When the concentration is lower than 20%, collecting the landfill gas after reaction; 4) and transporting the reacted slag to a landfill site for landfill. The device for preventing and treating the scaling blockage of the refuse landfill comprises a treatment room, a discharge gate, an air inlet, an air outlet and a slag discharge hole, wherein the air outlet is provided with a gas monitor, the bottom of the treatment room is paved with a landfill gas inlet pipeline, and the air inlet is arranged on the inlet pipeline. Solves the problem of scaling and blocking caused by mixed filling of furnace slag and household garbage, and improves CO2The removal efficiency, the purification landfill gas quality, the utilization efficiency of the landfill gas are improved, and the resource treatment of the incinerator slag is carried out.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a method and a device for preventing and treating scaling and blockage of a garbage landfill by treating garbage incineration byproducts, namely combination of slag and byproducts of the garbage landfill and landfill gas.
Background
At present, landfill gas in China has high yield, the landfill gas refers to mixed gas with complex composition generated by microbial activity and other factors in a landfill yard, and the main component of the mixed gas is CH4And CO2The minor constituent comprises H2O、H2S、N2And the like. Wherein CH450-65% of CO2Accounting for 30 to 40 percent. CH (CH)4Has high heat value (35.9 MJ/m)3) The energy-saving device can be used as a novel renewable energy source for power generation, renewable energy source production, cogeneration and the like. But the main impurity component CO in the landfill gas2The calorific value of the landfill gas is greatly reduced, and therefore CO2The removal of (A) can result in a reduced relative density of the purified landfill gas, CH4The concentration of the landfill gas is greatly improved, the heat value is increased, and the quality of the landfill gas is improved, so that the landfill gas meets the standard requirement of being used as high-quality natural gas power generation or automobile fuel. Therefore, the landfill gas purification process is a key step and is not necessary to comprehensively utilize the landfill gasCan reduce the purification process. CO is more applied at present2The removal process mainly comprises a physical or chemical absorption process, a pressure swing adsorption process, a membrane separation process and a cryogenic separation process. If the pressure swing adsorption purification efficiency is high, the investment and operation cost is too high, the procedure is complex, and although the operation of the water washing process is simple, a large amount of water resources are consumed.
The garbage incineration is developed rapidly in recent years due to the characteristics of small occupied area and high efficiency and rapidness in solid waste treatment. At the same time, incineration of waste produces a large amount of by-products, including slag and fly ash. Wherein the slag accounts for 80% of the total amount of the incineration byproducts. The waste incineration slag refers to residue left on the fire grate and fine ash falling from the fire grate in the waste incineration process. Can be treated as common solid waste. At present, the domestic waste incineration amount exceeds 219080t/d, calculated according to the condition that the incineration fly ash amount is 16 percent of the incineration waste amount, the waste incineration generates 1279 million tons of slag every year. The treatment and disposal of slag also present a major technical difficulty.
Compared with the development of the resource utilization of the household garbage, the resource development process of the garbage incinerator slag is slow. Due to the great contradiction between the increasing slag yield and the limited resource utilization, at present, most of the slag in China still directly enters a household garbage landfill for disposal. The standard for controlling pollution of domestic refuse landfill (GBI 6889-2008) indicates that the domestic refuse incinerator slag can directly enter the domestic refuse landfill for landfill disposal. Ca in the slag is a main element and accounts for 50 to 60 percent of the content of metal elements in the slag. Once the calcium-rich waste enters the landfill, the compounds may be released into the liquid phase and then enter the leachate in ionic form. Finally, under certain conditions, Ca2+The sediment plug of calcium is gradually deposited and formed, scaling and blocking of geomembrane and pipeline system are caused, the percolate water level of the landfill can be continuously increased, the geomembrane is easily broken due to pressure increase, the landfill is easily collapsed, and the stability of the landfill is further influenced.
The Chinese patent application with publication number CN105062598B discloses a method for combined treatment inside and outside a landfill gas field, which comprises the following steps: (1) performing in-situ purification in a landfill; (2) the landfill gas enters a purification packed tower. The effects of purifying landfill gas and improving the quality of released gas are achieved. The Chinese patent application with publication number CN106284429A discloses a municipal solid waste incineration ash landfill and an anti-scaling treatment method thereof, wherein the calcium concentration in leachate is controlled by an aging pretreatment source, and the water level of a leachate collection well is controlled at the same time, so that the anti-scaling purpose is achieved. And the treatment capacity of the purification packed tower is limited, so that the purification of landfill gas is focused, and the problem of slag packing disposal is not considered. The aging pretreatment time period is long, and the occupied area is wide.
The existing slag pretreatment technology comprises weathering, water washing, curing, medicament stabilization, heat treatment and the like, and the existing method is mainly used for removing heavy metals and stabilizing the properties of slag. The prior treatment method has the problems of long required time (requiring several weeks to several months), high treatment cost, low treatment efficiency and the like. Therefore, an efficient and convenient method needs to be provided for slag treatment, and landfill gas needs to be purified, so that the scaling risk of a landfill site is reduced, and the stability of the landfill site is maintained.
Disclosure of Invention
The invention aims to provide a method for preventing and treating the scaling blockage of a refuse landfill by utilizing slag and landfill gas aiming at the discharge characteristics of the landfill gas of the refuse landfill, the scaling condition of the landfill and the physicochemical characteristics of incineration slag at present, and provides a combined treatment method for preventing and treating the scaling blockage of the refuse landfill by purifying the landfill gas, reducing the dissolution of calcium ions in the slag, preventing and treating the scaling of the landfill and recycling the incineration slag on one hand, so as to effectively reduce the risk of the scaling blockage of the mixed filling of the slag and the domestic garbage, improve the CO2The removal efficiency, the purification landfill gas quality, the utilization efficiency of the landfill gas are improved, and the resource treatment of the incinerator slag is carried out. The invention also provides a device for preventing and treating the scaling blockage of the refuse landfill by utilizing the slag and the landfill gas, the incinerator slag and the landfill gas are treated together, and the device is simple and easy to operate.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in order to achieve the purpose, the method for preventing and treating the scaling blockage of the refuse landfill by adopting the device comprises the following steps:
1) discharging the incinerated slag to a slag filling layer in the treatment room, and sealing the treatment room;
2) conveying the landfill gas into the treatment room through the gas inlet pipeline, and reacting the landfill gas with the furnace slag;
3) after reacting for a certain time, detecting CO in the gas at the gas outlet2Concentration of when CO2When the concentration is higher than 20%, the landfill gas returns to the treatment room from the pipeline to continue reacting, and when CO is generated2When the concentration is lower than 20%, collecting the landfill gas after reaction;
4) and after 3-5 days of treatment, replacing the slag in the treatment room, and transporting the reacted slag to a landfill site for landfill.
Further, the reaction temperature in the step 2) is 20-35 ℃.
Further, the reaction time in the step 3) is 7-8 h.
The invention utilizes Ca in the slag to exist mainly in an oxidation state and to react with reduced CO2The oxidation-reduction reaction is carried out, CaO in the incinerator slag can be effectively solidified, the risk of scaling of the landfill site is reduced, and the normal operation of the landfill site is maintained. Simultaneously, the landfill gas is purified, and CH is added4And the proportion improves the quality of the landfill gas. The main reaction is as follows:
CaO+CO2→CaCO3
the device for preventing and treating scaling blockage of the refuse landfill comprises a treatment room, an unloading gate, an air inlet, an air outlet and a slag discharge hole, wherein the side wall of the treatment room is provided with the unloading gate, the treatment room is a closed space when the unloading gate is closed, a slag filling layer is arranged below the unloading gate in the treatment room, the lower part of the slag filling layer in the treatment room is provided with the slag discharge hole, the air outlet is arranged above the slag filling layer, the air outlet is provided with an air monitor, a landfill gas inlet pipeline is laid at the bottom of the treatment room, and the air inlet is arranged on the air inlet pipeline.
Furthermore, valves for controlling the gas flow are arranged at the gas inlet and the gas outlet.
Furthermore, a backflow pipeline is arranged between the air inlet and the air outlet, and a backflow pump is arranged on the backflow pipeline.
Furthermore, air inlet pipelines are arranged around the slag landfill layer in the treatment room.
Further, the admission line includes transportation person in charge and transportation branch pipe, the transportation is responsible for horizontal level and is laid, the transportation is responsible for and is set up one section transportation branch pipe, all at one section distance of interval on the transportation, the vertical level of transportation branch pipe is laid.
Furthermore, the distance between every two adjacent transportation branch pipes is 1-3m, and 2-3 holes are drilled on the transportation branch pipes every 20-50 cm.
Furthermore, an unloading platform is arranged outside the unloading gate, so that the slag feeding car can conveniently unload the slag.
Further, a discharge opening is formed in the position of the discharge gate, and the discharge opening is funnel-shaped.
Further, the funnel-shaped discharge opening is a discharge opening with a closable leakage opening.
The invention has the following beneficial effects:
1. remarkably reduces the risk of scaling and blocking in the landfill site and maintains the stable operation of the landfill site
The calcium-containing substance enters the landfill to increase the risk of scaling and blocking of the landfill and seriously reduce the stability of the landfill. According to the invention, the slag is solidified by the landfill gas, and calcium ions in the slag are converted into calcium carbonate, so that the risk of calcium ion seepage is reduced. And the soil is filled into a landfill, so that the scaling possibility of the geomembrane and a percolate collecting system is reduced, and the stability of the landfill is improved.
2. Obviously reducing CO in landfill gas2Content, improving the quality of landfill gas
CH in landfill gas at present4The resource utilization rate is low, the potential energy in the landfill gas is not fully utilized, and the landfill gas needs to be purified continuously, in particular to remove the landfill gasCO in2To increase the heat value and CH in the purified gas4And (4) content. The traditional method has the disadvantages of high cost and large consumption of water resources. The landfill gas purification device is arranged in the landfill operation area, and the landfill gas is introduced into the purification device by the air inducing device, so that the energy consumption can be effectively reduced, and better CO can be obtained2The removal effect is improved, and the heat value is improved. The landfill gas is discharged to a landfill gas purifying device through a gas guide pipe, and renewable automobile fuel, natural gas pipeline transportation and the like can be produced.
3. Complete the comprehensive utilization of the garbage incinerator slag
At present, the pretreatment of the waste incineration slag before entering a landfill site mainly comprises modes of weathering, water washing, medicament stabilization, heat treatment and the like. The traditional method has the defects of high cost, low efficiency, high compatibilization rate and the like. The invention utilizes the slag to fill the landfill gas purification device, fully reduces the slag pretreatment cost and completes the slag solidification. Meanwhile, the quality of the landfill gas is improved, and the possibility of scaling of a geomembrane and a percolate collecting system of the landfill caused by the fact that furnace slag enters the landfill is reduced.
4. Realizes the comprehensive utilization of landfill gas and incineration slag of the landfill
The method utilizes the characteristics of the waste incineration slag and the discharge characteristics of the landfill gas, develops the comprehensive treatment of landfill gas purification and slag solidification, improves the quality of the landfill gas and effectively solidifies the slag. CO treated by the invention2The removal rate can reach more than 34 percent. The calcium ion exudation of the solidified incineration slag is obviously reduced. Therefore, the method has good environmental and social benefits.
1. Remarkably reduces the risk of scaling and blocking in the landfill site and maintains the stable operation of the landfill site
2. Obviously reducing CO in landfill gas2Content, improving the quality of landfill gas
3. Complete the comprehensive utilization of the garbage incinerator slag
4. Realizes the comprehensive utilization of landfill gas and incineration slag of the landfill
Drawings
The invention is described in detail below with reference to the following figures and detailed description, wherein:
FIG. 1 is a block diagram of steps of a method for preventing and treating scaling and blockage of a refuse landfill by using the device.
Fig. 2 is a schematic diagram of a device for preventing and treating scaling blockage of a refuse landfill by adopting the device.
FIG. 3 is a schematic view of the top arrangement of the inlet pipes at the bottom of the treatment room.
FIG. 4 is an XRD (X-ray diffractometer) chart of slag before reaction in example 1.
FIG. 5 is an XRD (X-ray diffractometer) chart of slag after the reaction in example 1.
Wherein: the method comprises the following steps of 1-discharging gate, 2-slag feeding car, 3-discharging platform, 4-slag discharging position, 5-slag filling layer, 6-slag discharging hole, 7-slag transport car, 8-landfill site, 9-air inlet, 10-backflow pipeline, 11-backflow pump, 12-air outlet, 13-gas detector, 14-power plant, 15-temperature sensor and 16-processing room.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1:
a method for preventing and treating the scaling and blockage of the refuse landfill by adopting the device is shown in figure 1 and comprises the following steps:
1) collecting slag (slag XRD before reaction is shown in figure 4) in a fire grate opening of the garbage incinerator, taking 50g of slag to a treatment room, and sealing the treatment room;
2) conveying landfill gas consisting of 60% methane and 40% carbon dioxide into a treatment room through an air inlet pipeline, uniformly arranging air guide pipes at the bottom and two sides of the treatment room, wherein the air inlet flow is 50mL/min, ensuring that furnace slag is fully contacted with the landfill gas for reaction, and the reaction temperature is 35 ℃;
3) gas monitor is arranged at the exhaust port to monitor CO at any time2Concentration, entering through the circulation pumpThe treatment is continued in the treatment room, and after the reaction time is 8 hours, the CO in the landfill gas2The concentration is 19.14 percent (lower than 20 percent), and the landfill gas after the reaction is collected and directly transported to a power plant for use.
4) And after 3 days of treatment, stopping gas inlet of the furnace slag in the treatment room, emptying landfill gas in the treatment room, transporting the reacted furnace slag to a landfill site for landfill, and replacing new furnace slag to the treatment room.
The processed slag (slag XRD after reaction see fig. 5) was subjected to three sets of exudation experiments simultaneously:
TCLP (American environmental protection agency 1315-toxicity characteristic leaching test), wherein the calcium ion concentration of the slag before reaction is 7386mg/L, and the calcium ion concentration of the slag after reaction is 6485 mg/L;
SPLP (environmental protection agency 1312, synthetic precipitation leaching test), wherein the calcium ion concentration of slag before reaction is 471mg/L, and the calcium ion concentration of slag after reaction is 416 mg/L;
and (3) a leachate leaching test (pH is 5.89), adding 5g of slag after reaction into 30mL of leachate, placing the leachate in a shaking table at 25 ℃ for 24h at 200r/min, standing, removing supernatant to measure the calcium ion content, wherein the calcium ion concentration of the slag before reaction is 7652mg/L, and the calcium ion concentration of the slag after reaction is 4593 mg/.
The calcium ion concentration of the slag after the reaction is obviously reduced compared with that before the reaction, and CO in the landfill gas after the reaction2The content is reduced, the methane content is improved, and the quality of the landfill gas after reaction is high, so that the landfill gas meets the standard requirement of being used as high-quality natural gas power generation or automobile fuel.
Example 2:
a method for preventing and treating the scaling and blockage of the refuse landfill by adopting the device comprises the following steps:
1) collecting slag in a fire grate opening of the garbage incinerator, filling 50g of the slag into a treatment room, and sealing the treatment room;
2) conveying landfill gas consisting of 60% methane and 40% carbon dioxide into a treatment room through an air inlet pipeline, uniformly arranging air guide pipes at the bottom and two sides of the treatment room, wherein the flow rate is 31.32mL/min, ensuring that furnace slag and the landfill gas are fully contacted for reaction, and the reaction temperature is 20 ℃;
3) gas monitor is arranged at the exhaust port to monitor CO at any time2The concentration is continuously treated in a treatment room through a circulating pump, and after 7 hours of reaction, CO in the landfill gas2The concentration is 19.14 percent (lower than 20 percent), and the landfill gas after the reaction is collected and directly transported to a power plant for use.
4) And after the slag in the treatment room is treated for 5 days, stopping air inflow, emptying landfill gas in the treatment room, and conveying the slag after reaction to a landfill site for landfill.
TCLP (method for identifying hazardous waste of the United states environmental protection agency), the calcium ion concentration of the slag before reaction is 7529mg/L, and the calcium ion concentration of the slag after reaction is 6631mg/L
SPLP (American environmental protection agency simulated acid rain leaching method), wherein the calcium ion concentration of the slag before reaction is 480mg/L, and the calcium ion concentration of the slag after reaction is 424mg/L
In a leachate leaching test (pH is 5.89), the calcium ion concentration of the slag before reaction is 7716mg/L, and the calcium ion concentration of the slag after reaction is 4645mg/L
The calcium ion concentration of the slag after the reaction is obviously reduced compared with that before the reaction, the content of CO2 in the landfill gas after the reaction is reduced, the content of methane is improved, and the quality of the landfill gas after the reaction is high, so that the landfill gas can meet the standard requirement of being used as high-quality natural gas for power generation or automobile fuel.
Example 3:
a method for preventing and treating the scaling and blockage of the refuse landfill by adopting the device comprises the following steps:
1) collecting slag in a fire grate opening of the garbage incinerator, taking 50g of slag to a treatment room, and sealing the treatment room;
2) conveying landfill gas consisting of 60% methane and 40% carbon dioxide into a treatment room through an air inlet pipeline, uniformly arranging air guide pipes at the bottom and two sides of the treatment room, wherein the air inlet flow is 50mL/min, ensuring that furnace slag is fully contacted with the landfill gas for reaction, and the reaction temperature is 30 ℃;
3) and arranging a gas monitor at the exhaust port, monitoring the concentration of CO2 at any time, entering a treatment room through a circulating pump for continuous treatment, after the reaction time is 8 hours, controlling the concentration of CO2 in the landfill gas to be 19.2 percent (lower than 20 percent), and collecting the landfill gas after the reaction and directly transporting the landfill gas to a power plant for use.
4) And after 3 days of treatment, stopping gas inlet of the furnace slag in the treatment room, emptying landfill gas in the treatment room, transporting the reacted furnace slag to a landfill site for landfill, and replacing new furnace slag to the treatment room.
The treated slag was subjected to three sets of exudation experiments simultaneously:
TCLP (American environmental protection agency 1315-toxicity characteristic leaching test), wherein the calcium ion concentration of the slag before reaction is 7673mg/L, and the calcium ion concentration of the slag after reaction is 6778 mg/L;
SPLP (environmental protection agency 1312, synthetic precipitation leaching test), wherein the calcium ion concentration of the slag before reaction is 491mg/L, and the calcium ion concentration of the slag after reaction is 432 mg/L;
and (3) a leachate leaching test (pH is 5.89), adding 5g of slag after reaction into 30mL of leachate, placing the leachate in a shaking table at 25 ℃ for 24h by shaking at 200r/min, standing, removing supernatant to measure the calcium ion content, wherein the calcium ion concentration of the slag before reaction is 7780mg/L, and the calcium ion concentration of the slag after reaction is 4697 mg/.
The calcium ion concentration of the slag after the reaction is obviously reduced compared with that before the reaction, the content of CO2 in the landfill gas after the reaction is reduced, the content of methane is improved, and the quality of the landfill gas after the reaction is high, so that the landfill gas can meet the standard requirement of being used as high-quality natural gas for power generation or automobile fuel.
Example 4:
as shown in fig. 2-3, a device for preventing and treating scaling blockage of a refuse landfill comprises a treatment room 16, a discharge gate 1, an air inlet 9, an air outlet 12 and a slag discharge port 6, wherein the discharge gate 1 is arranged on the side wall of the treatment room 16, the treatment room 16 is a closed space when the discharge gate 1 is closed, a slag filling layer 5 is arranged below the discharge gate 1 in the treatment room 16, the slag discharge port 6 is arranged at the lower part of the slag filling layer 5 in the treatment room 16, the air outlet 12 is arranged above the slag filling layer 5, the air outlet 12 is provided with an air monitor 13, a filling air inlet pipeline 17 is laid at the bottom of the treatment room 16, and the air inlet 9 is arranged on the air inlet pipeline 17.
In the embodiment, the gas inlet 9 and the gas outlet 12 are provided with valves for controlling the gas flow, the gas flow is adjusted according to the gas yield, and when the carbon dioxide content in the gas outlet is more than 30%, the gas inflow is reduced; and when the carbon dioxide content of the air outlet is lower than 20%, the air inlet amount is increased.
In this embodiment, a backflow pipeline 10 is arranged between the gas inlet 9 and the gas outlet 12, a backflow pump 11 is arranged on the backflow pipeline 10, and the backflow pump 11 provides power for gas to flow back into the processing room 16.
In this embodiment, the gas inlet pipe 17 is provided around the slag burying layer 5 in the processing room 16, and when the slag enters the processing room, different particle size layers are naturally formed according to the particle size of the particles, and the fine particle size is at the bottom, so the gas inlet pipe 17 is also provided above the burying layer to provide sufficient contact between the burying gas and the slag.
In this embodiment, the air intake duct 17 includes a main transport duct 171 and branch transport ducts 172, the main transport duct 171 is horizontally laid in the transverse direction, one branch transport duct 172 is disposed on the main transport duct 171 at intervals, and all the branch transport ducts 172 are horizontally laid in the longitudinal direction.
In this embodiment, the transportation pipeline 17 is a PVC perforated pipe, the distance between each two adjacent transportation branch pipes is 1m or 2m or 3m, the transportation pipeline 17 is uniformly provided with air inlets 9, the aperture is 1m or 2cm, the hole distance is 10m or 20cm, sufficient contact between the slag and the landfill gas is ensured, and the pipeline is provided with air inlets 9 at two sides.
In this embodiment, the discharging platform 3 is arranged outside the discharging gate 1, and a discharging opening is arranged at the discharging gate and is funnel-shaped.
Specifically, a slag feeding cart 4 is arranged on a discharging platform 3, a discharging gate 1 is opened, slag is discharged to a funnel-shaped discharging opening, the slag is made to fall to a slag burying layer 5, then the slag feeding cart 4 is moved away, the discharging gate 1 is closed, the reaction is allowed to continue, the flow of inlet gas and outlet gas is adjusted according to the yield of collected final gas in the reaction process, calcium ions in the slag are solidified after the slag in a treatment room is treated for 3-5 days, and the slag in the treatment room is conveyed to the burying field for burying; and the gas in the treatment room is exhausted through the gas outlet after the new slag is replaced, then the slag is discharged again through the slag feeding car 4, and the collected gas which is not completely treated flows back to the treatment room again through the reflux pump to be treated continuously.
As shown in fig. 2, another embodiment of the present invention, this embodiment has the whole contents of embodiment 3 above, except that: the funnel-shaped discharge opening is a discharge opening with a leakage opening capable of being closed.
Specifically, a slag feeding cart 4 is arranged on a discharging platform 3, a discharging gate 1 is opened, slag is discharged to a funnel-shaped discharging port, then the slag feeding cart 4 is moved to close the discharging gate 1, a processing room 16 is in a closed state, the funnel-shaped discharging port is opened, the slag falls to a slag burying layer 5, the reaction is continued, the flow of gas entering and exiting is adjusted according to the yield of collected final gas in the reaction process, calcium ions in the slag are solidified after the slag in the processing room is processed for 3-5 days, and the slag in the processing room is conveyed to the burying field for burying; and the gas in the treatment room is exhausted through the gas outlet after the new slag is replaced, then the slag is discharged again through the slag feeding car 4, and the collected gas which is not completely treated flows back to the treatment room again through the reflux pump to be treated continuously.
In this embodiment, the gas monitor can adopt online methane carbon dioxide detector, 24 hours uninterrupted duty, can set for the upper and lower limit alarm value, and specific model is for example: CJR4/5 type methane and carbon dioxide detector.
As shown in fig. 2, another embodiment of the present invention, this embodiment has the whole contents of embodiment 3 above, except that: a temperature sensor 16 is provided in the chamber to monitor the temperature, and the unreacted fill gas contains about 50-65% methane, with an upper explosion limit of 15.4%. The lower limit is 5% and the required ignition temperature is 538 ℃ and typically the methane content will increase as the reaction proceeds and will not be in an explosive state, but it is not excluded that the methane will be in an explosive range as a result of a change in the composition of the landfill gas produced in the landfill, so a temperature monitor 16 is added to increase the safety factor.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. The device for preventing and treating the scaling blockage of the refuse landfill by using the method for preventing and treating the scaling blockage of the refuse landfill by using the furnace slag and the landfill gas is characterized in that:
the method for preventing the scaling and blocking of the refuse landfill by utilizing the slag and the landfill gas comprises the following steps:
1) discharging the incinerated slag to a slag filling layer in the treatment room, and sealing the treatment room;
2) conveying the landfill gas into the treatment room through the gas inlet pipeline, and reacting the landfill gas with the furnace slag;
3) after reacting for a certain time, detecting CO in the gas at the gas outlet2Concentration of when CO2When the concentration is higher than 20%, the landfill gas returns to the treatment room from the pipeline to continue reacting, and when CO is generated2When the concentration is lower than 20%, collecting the landfill gas after reaction;
4) after 3-5 days of treatment, replacing the slag in the treatment room, and transporting the reacted slag to a landfill site for landfill;
the device for preventing and treating scaling blockage of the refuse landfill comprises a treatment room, a discharge gate, an air inlet, an air outlet and a slag discharge hole, wherein the side wall of the treatment room is provided with the discharge gate, the treatment room is a closed space when the discharge gate is closed, a slag buried layer is arranged below the discharge gate in the treatment room, the lower part of the slag buried layer in the treatment room is provided with the slag discharge hole, the air outlet is arranged above the slag buried layer, the air outlet is provided with a gas monitor, a buried gas inlet pipeline is laid at the bottom of the treatment room, and the air inlet is arranged on the gas inlet pipeline;
and a backflow pipeline is arranged between the air inlet and the air outlet, and a backflow pump is arranged on the backflow pipeline.
2. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: and valves for controlling the gas flow are arranged at the gas inlet and the gas outlet.
3. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: and air inlet pipelines are arranged around the slag landfill layer in the treatment room.
4. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: the air inlet pipeline comprises a transportation main pipe and transportation branch pipes, wherein the transportation main pipe is horizontally laid, one transportation branch pipe is arranged on the transportation main pipe at intervals, and all the transportation branch pipes are horizontally laid in the longitudinal direction.
5. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 4, wherein: the distance between every two adjacent transportation branch pipes is 1-3m, and 2-3 holes are drilled on the transportation branch pipes every 20-50 cm.
6. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: the discharging gate is provided with a discharging opening which is funnel-shaped.
7. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: the reaction temperature in the step 2) is 20-35 ℃.
8. The apparatus for preventing and treating scaling and clogging in a refuse landfill using slag and landfill gas as claimed in claim 1, wherein: the reaction time in the step 3) is 7-8 h.
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| CN201810108187.5A CN108405549B (en) | 2018-02-02 | 2018-02-02 | Method and device for preventing and treating scaling blockage of refuse landfill by utilizing furnace slag and landfill gas |
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| CN105062598B (en) * | 2015-08-28 | 2017-06-27 | 台州学院 | A kind of method of Combined Treatment outside landfill gas internal field |
| CN106001058B (en) * | 2016-06-16 | 2018-04-03 | 同济大学 | Utilize the method for domestic waste incineration residue process industry chemicals |
| CN106284429B (en) * | 2016-08-10 | 2018-08-24 | 同济大学 | A kind of domestic refuse incineration ash landfill yard and its good antiscale property processing method |
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