CN109610622B - Filling, protecting and water storing system with strip-type structure for coal mining area - Google Patents
Filling, protecting and water storing system with strip-type structure for coal mining area Download PDFInfo
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- CN109610622B CN109610622B CN201811305499.1A CN201811305499A CN109610622B CN 109610622 B CN109610622 B CN 109610622B CN 201811305499 A CN201811305499 A CN 201811305499A CN 109610622 B CN109610622 B CN 109610622B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/30—Flood prevention; Flood or storm water management, e.g. using flood barriers
Abstract
A strip-structured filling, protecting and water storing system for a coal mining area belongs to the technical field of water resource protection and utilization of the coal mining area in coal mining, and can solve the problems of underground water loss and waste of water resources of the coal mining area caused by mining breakage of a water-proof rock stratum of the existing coal mining area. The invention realizes water-retaining coal mining in coal mining areas and full recycling of water resources.
Description
Technical Field
The invention belongs to the technical field of water resource protection and utilization in a mining area in coal mining, and particularly relates to a filling, protecting and water storing system with a strip-type structure in the mining area.
Background
70 percent of coal mine areas in China are short of water resources, 40 percent of coal mines are seriously lack of water, and the water shortage of the coal mines in China reaches 69.86 ten thousand meters3(d) domestic water shortage of 3.3 ten thousand meters3And d. Northeast, northwest, Shanxi, inner Mongolia and Yuxi are main coal producing areas of China, water consumption of coal mines in the areas is very tight, and water supply in some mining areas is insufficient every day4h, the coal mine production is severely restricted and the daily life of coal workers is influenced, and the coal mine production and coal production development are the key factors influencing the life of coal workers and restricting the development of coal production.
In the coal mining process, the rock stratum is disturbed to cause fracture and damage, the underground water-containing layer is easily damaged to cause the loss of underground water, the ground surface is sunk, the house is damaged, the fertile farmland is damaged, and the vegetation on the ground surface is destructively damaged; most of China coal mines are concentrated in the north and the west, the evaporation capacity is basically 6-7 times of rainfall, the rainfall capacity is very little in most of time, the China coal mines belong to seasonal rainfall, when a large amount of rainfall occurs in rainy season, rainwater cannot be collected and efficiently stored, and the rainwater is evaporated, so that water for mining areas is very short; mine water discharged by only national mines reaches 22 hundred million tons in China every year, about 2 tons of waste water are discharged when one ton of coal is mined, and if the waste water is discharged randomly, the environment is polluted and a large amount of water resources are wasted; the domestic sewage discharge amount of a mining area is an extremely huge number, and if the domestic sewage discharge amount cannot be well recycled, the domestic sewage discharge amount is discharged at will and evaporated, so that the environment is polluted, and a large amount of water resources are wasted.
Disclosure of Invention
The invention provides a strip-structured filling, protecting and water storing system for a coal mining area, aiming at the problems of underground water loss and water resource waste of the coal mining area caused by mining fracture of a water-proof rock stratum of the existing coal mining area.
The invention adopts the following technical scheme:
a strip-structured filling, protecting and water storing system for a coal mining area comprises a rainwater collecting system, a domestic sewage collecting system and a mine water collecting system, wherein the rainwater collecting system comprises four subsystems of a rainwater ground collecting system, a rainwater underground gangue filtering system, a rainwater underground secondary purifying system and a purified rainwater underground reservoir system which are connected in sequence, the domestic sewage collecting system comprises five subsystems of a domestic sewage ground collecting system, a domestic sewage underground gangue filtering system, a domestic sewage underground primary sedimentation system, a domestic sewage underground secondary purifying system and a purified domestic sewage underground reservoir system which are connected in sequence, the mine water collecting system comprises four subsystems of a mine water underground gangue filtering system, a mine water underground primary sedimentation system, a mine water underground secondary purifying system and a purified mine water underground reservoir system which are connected in sequence, the rainwater collection system, the domestic sewage collection system and the mine water collection system are all provided with strip filling body bearing structures which bear the acting force of an overlying strata, control the movement deformation and the structural damage of the overlying strata, achieve the purpose of water retention and coal mining, and form a stable water storage space in an underground goaf, wherein the strip filling body bearing structures are strip-structured filling bodies which are 1-5m wide strips arranged at intervals in the goaf of a coal mining area and form a 'filling strip-direct roof' structural control system along with mining and filling.
Rainwater ground collection system is including according to a plurality of inlet channels, catch basin and retaining well, the catch well includes that rainwater holds well and domestic sewage and holds the well, and rainwater holds and is equipped with the partition door between well and the domestic sewage holds the well, and the inlet channel is connected with the catch basin, and the catch basin is connected with the rainwater catch well in holding the well, and wherein, inlet channel evenly distributed is in coal mining area, and the inlet channel is umbelliform collect with the catch basin, and the main trunk both sides of inlet channel are equipped with a plurality of branches.
The domestic sewage ground collection system comprises a sewage discharge pipe and a sedimentation tank, wherein the sewage discharge pipe is connected with the sedimentation tank, and the sedimentation tank is connected with a biological sewage storage well in a water storage well.
And a generator-storage motor set is arranged at the position of the water storage well, close to the goaf bottom plate of the coal mining area, wherein the generator is a mixed flow type hydroelectric generator, the power is 150-500kw, the voltage is 380V, and the storage motor is a lead-acid battery.
The cross section of the well mouth of the water storage well is circular, the cross section of the part below the generator-storage battery unit is a rectangular cross section, and the rectangular cross section is 2-5m long, 2-5m wide and 30-40cm thick.
Waste rocks in the rainwater underground waste rock filtering system, the domestic sewage underground waste rock filtering system and the mine water underground waste rock filtering system all comprise waste rocks with different particle sizes, wherein the content of the waste rocks with the particle sizes of 0.8-1.2m is 45-55%, the content of the waste rocks with the particle sizes of 0.5-0.8m is 25-32%, the content of the waste rocks with the particle sizes of 0.2-0.5m is 15-25%, and the waste rocks with the particle sizes are coal gangue and volcanic rock which are mixed according to the mass ratio of 4-5: 2.
Flocculating agents are arranged in the domestic sewage underground primary sedimentation system and the mine water underground primary sedimentation system.
The domestic sewage underground primary sedimentation system and the mine water underground primary sedimentation system are internally provided with a fast filter or a gravity type valveless filter, and the fast filter or the gravity type valveless filter is internally provided with filter materials comprising anthracite and quartz sand.
Active carbon, a precision filter and an electrodialysis device are sequentially arranged in the rainwater underground secondary purification system, the domestic sewage underground secondary purification system and the mine water underground secondary purification system.
The strip filling body bearing structure comprises a filling body, a waterproof layer positioned on the surface of the filling body and a cement mortar layer positioned on the surface of the waterproof layer, wherein the filling body comprises the following components in unit volume mass: coal gangue: 950kg/m3Fly ash: 380kg/m3Cement: 350kg/m3380kg/m of water3Rubber powder: 50kg/m3And naphthalene-based superplasticizer: 6kg/m3Carboxylate type early strength agent: 4kg/m3And an accelerator: 4kg/m3Barium chloride: 6kg/m3The thickness of the cement mortar layer is 20cm, the interval of the filling bodies is 2-6m, and the width is 1-5 m.
The invention realizes the purposes of water retention, water storage and water purification by filling in a strip structure. The sewage discharge pipe is buried 5m below the ground surface, and the open cut method is adopted for construction.
The rainwater ground collection system and the domestic sewage ground collection system are both arranged on the ground and are not far away, the rainwater collecting tank can be used for relieving drainage pressure in the domestic sewage drainage peak period, and the domestic sewage collecting tank can also be used for relieving drainage pressure in the rainy season during the rainy peak period.
The generator-accumulator unit of the invention is mainly aimed at preventing emergency electricity utilization when the water discharge is small.
The partition door is made of stainless steel, and the partition door is controlled by a motor, and the size of the partition door is consistent with that of the water storage well.
The bearing structure of the strip filling body is characterized in that 1-5m wide strip structured filling bodies are arranged at intervals of 2-6m in a goaf, and the filling is carried out along with mining, so that the purpose of water-retaining coal mining is achieved; a 'filling strip-direct roof' structure control system is formed by strip filling, a stable water storage space is formed in an underground goaf, seasonal precipitation and clean mine water (meeting the drinking water standard after inspection) in a mining area are safely and efficiently stored, and surface water is prevented from evaporating; furthermore, a plurality of spaces with different independent functions are formed in the coal seam goaf through narrow-strip (namely wall type) filling bodies.
In the gangue filtering system, the selected gangue and the volcanic rock have the characteristics of high porosity and high strength, and the main purpose of the gangue filtering system is to remove suspended particulate matters in domestic sewage and coal dust particles, rock powder, clay and the like in mine water. A gangue crushing system is arranged underground, and a jaw crusher is used, so that the gangue needs to be updated every two years.
The ground is provided with a primary water pump system and a secondary water pump system, and the water in the reservoir is pumped to the ground for use in life, industrial and agricultural production and coal mining on a coal face.
The flow of water in the underground filtering system is self-flowing, a common working mode of self-flowing and a water pump is adopted at a position where the water enters a storage reservoir, the gradient of a bottom plate is designed, the gradient of 3% of the water flow direction is along, and the flow is not limited.
After advanced treatment, the domestic sewage is mainly used for circulating cooling water of a power plant and water of a boiler water supply, and the water quality requirement of the domestic sewage meets the requirement of GB50050-2007 design Specification for circulating cooling water treatment, namely the pH value is 7.0-8.5; SS <5 mg/L; turbidity <5 NTU; CODcr <30 mg/L; BOD5 is less than 5 mg/L, NH3-N is less than 5 mg/L, and the water quality of the supplementary water source water of the power plant boiler is required to be less than 10 mg/L; after the mine water is purified, the water quality is odorless, odorless and visible, the pH value is 6.5-8.5, the turbidity is less than 3NTU, the CODcr is less than 20mg/L, and the total number of bacteria is less than 100/mL; the total coliform group is less than 3 per liter, and can meet the requirement of low water consumption of coal preparation plants in mining areas, plant flushing, dust prevention, underground grouting and the like.
The rainwater purified by the rainwater collection system reaches the standard of domestic water, the sanitary standard of domestic drinking water (GB 5749-2006) and the rainwater well underground reservoir system refer to that when a rainy season of a mining area comes, rainwater passes through the gangue filtering system and the secondary purification system through the water storage well and then is stored in a reservoir, part of mine water can reach the standard of the domestic drinking water only through simple disinfection treatment after being detected underground, and the part of clean mine water can be stored in the reservoir after being treated by the secondary purification system and is mainly used for the domestic water of the mining area.
The invention has the following beneficial effects:
1. according to coal bed distribution, surrounding rocks and hydrogeological conditions (positions of underground aquifers), strip-type structure filling is adopted, so that an overlying water-resisting rock layer is not broken by mining, water resources in the aquifers are protected, and the purpose of water-retaining coal mining is achieved; through strip-type structural filling, the ground surface subsidence can be well controlled, and the ecological environment of ground surface buildings, structures and mining areas is protected; solid pollutants such as coal gangue and fly ash are consumed through the structural filling, and the pollution to the environment is reduced.
2. The device is filled in an underground goaf to form a stable water storage space through a strip structure, the capacity of the underground reservoir water storage space is easily calculated according to the distance between filling bodies and the distance between an upper top plate and a lower top plate, rainwater is introduced into an underground rainwater gangue filtering system by a water storage well through a water inlet channel and a water collecting tank arranged on the ground, and is finally discharged into a reservoir through a rainwater secondary purification tank, so that the seasonal rainfall in a mining area can be safely, efficiently and reliably stored, and the evaporation of surface water is prevented; storing the water resource which is detected to be clean mine water (the simple disinfection treatment reaches the standard of domestic drinking water) so as to meet the domestic water in the dry season of the whole mining area.
3. A plurality of independent spaces are formed in a coal seam goaf through narrow-strip (namely wall type) filling bodies, and water resources (mine area domestic sewage and mine water) from different sources are respectively treated by a gangue filtering system, a primary sedimentation tank, a secondary purification tank, isolation, storage and the like, so that the water demand of industrial and agricultural production and coal mining working faces in the dry period of the mine area is met.
4. A hydroelectric generator is arranged at the bottom of the water storage well, an underground energy storage power station chamber is built, the gravitational potential energy of surface water is converted into electric energy to be stored and utilized, the underground sewage treatment and the power consumption of a water pump are met, and the domestic power consumption of a mining area or the power consumption of a coal mining working face can be supplied.
Drawings
FIG. 1 is a schematic view of the overall arrangement of the present invention;
FIG. 2 is a schematic view of a water storage system with a strip structure according to the present invention;
FIG. 3 is a schematic diagram of the configuration of the impoundment well and the generator-storage cluster of the present invention;
wherein: 1-a water collecting tank; 2-water storage well; 3-a sedimentation tank; 4-generator-accumulator group; 5-a strip infill carrying structure; 6-rainwater underground gangue filtering system; 7-a rainwater downhole secondary purification system; 8-a purified catch basin lower reservoir system; 9-a domestic sewage underground gangue filtering system; 10-a domestic sewage underground primary sedimentation system; 11-a domestic sewage underground secondary purification system; 12-a purified domestic sewage underground reservoir system; 13-mine water underground gangue filtering system; 14-mine water down-hole primary sedimentation system; 15-mine water underground secondary purification system; 16-a purified mine water underground water storage system; 17-a rainwater storage well; 18-domestic sewage water storage well; 19-a separation door; 20-an accumulator; 21-a generator; 22-generator shaft.
Detailed Description
Example 1 was designed in accordance with the present invention against the background of the tunny ore.
The great Tun mining area is located in Peipi county of Jiangsu province, and the total area is about 245km 24 coal mines, 4 coal washery and 1 power plant (power plant containing gangue) are built. Before the mine water and domestic sewage are not treated and utilized, the production and domestic water in the whole mining area is extracted from underground deep well water except the surface water of the Weishan lake taken by a power plant. At present, the actual water intake amount is about 3900 ten thousand meters3A, pumping underground water in a long-term overload way,the stable sedimentation funnel is formed in partial area of the mining area, large-area ground surface sedimentation is generated, the threat to mine shafts and industrial square buildings is formed, and a water supply source must be searched for so as to reduce the extraction amount of underground water. The most direct and effective method for solving the water shortage problem in the mining area is to treat and utilize mine water and domestic sewage discharged from the mining area. The mine water discharge amount of the big tunning mine area is 800 ten thousand meters3A is about, and the discharge amount of domestic sewage is 1000 ten thousand meters3And a is about.
The Peixian county belongs to a warm temperate zone and semi-humid monsoon climate, is cold and dry in winter, has less rainfall, has high temperature and much rain in summer and much rainfall, has annual average sunshine of 2307.9 hours, has an annual sunshine rate of 54 percent, has an average annual frost-free period of about 201 days, and has an average annual rainfall of 816.4 millimeters.
In conclusion, the tunny mining area is suitable for adopting a comprehensive coal mining method of strip structured filling of 'water retention-storage-purified water', rainwater is stored in rainy seasons in summer, the recycling of domestic sewage and mine water is realized all the year round, and domestic water is supplemented by the stored rainwater and clean mine water in winter.
According to the rainfall in rainy season in the great tunning mining area, a ground rainwater collection system is designed to meet the requirement of rainwater collection in heavy rain.
According to the discharge amount of domestic sewage in a great-tunning mining area, a sewage ground collecting tank is designed, and mainly used for removing large-volume impurities in the domestic sewage.
The size of the water storage well is designed according to rainfall and domestic sewage discharge in rainy season, and the design diameter is 2.5 m.
The power of the generator is selected according to the rainfall and the domestic sewage discharge in rainy season, the mixed-flow alternating-current generator is selected at this time, the power is 200kw, and the storage battery is a common lead-acid battery.
The domestic sewage and rainwater division door is selected according to the size of the water storage well, and the size is 2.5m multiplied by 3m multiplied by 0.2m (width multiplied by length multiplied by thickness).
According to the depth of the tunny coal seam and the thickness of the coal seam, the selected filling material is a gangue aggregate cemented filling material, the raw materials are coal gangue, fly ash, cement, water and an additive, and the mixture ratio of the components isComprises the following steps: coal gangue 950kg/m3380kg/m of fly ash3Cement 350kg/m3380kg/m of water3The 28-day uniaxial compressive strength of the filling material can reach 15MPa, as mine water contains more sulfate ions, iron ions and other metal ions, rubber powder is added into the gangue aggregate cemented filling material to resist the corrosion of the sulfate ions, a naphthalene-based high-efficiency water reducing agent, a carboxylate early strength agent, an accelerating agent and barium chloride are additionally used, and 20cm of cement mortar is poured on the surface of a filling body in order to prevent domestic sewage and mine water from corroding the filling body for a long time.
According to the depth of the tunny mineral coal layer and the thickness of the coal layer, the width of the strip-shaped filling body is 5m, the distance between the strip-shaped filling bodies is 6m, and in order to prevent the storage reservoir from leaking water, 30cm of gangue aggregate cemented filling material is poured on the floor of the reservoir.
The gangue used by the gangue filtering system is gangue generated in a rock stratum and volcanic rock transported from the outside, the ratio of the gangue generated in a coal mine to the volcanic rock transported from the outside is 5:1, and the gangue gradation is as follows: 50% of the particles with the particle diameter of 1-1.5m, 30% of the particles with the particle diameter of 0.5-1m and 20% of the particles with the particle diameter of 0.2-0.5 m.
The method comprises the steps of using a polyaluminium chloride (PAC) flocculant in a primary sedimentation tank, and using an activated carbon adsorption, microfiltration and electrodialysis device in a secondary purification tank.
The first-stage water pump and the second-stage water pump adopt a U.S. Pentair Binttel stainless steel horizontal centrifugal booster water pump PWT100-65-315 DS.
And all underground lines are connected by adopting waterproof treatment.
When the rainy season comes, all rainwater is stored in an underground reservoir, domestic sewage is discharged into a water storage well after being precipitated on the ground at ordinary times, the rainwater is filtered by waste rocks, is subjected to primary precipitation and secondary purification and is stored in the reservoir, the stored rainwater and clean mine water are mainly used as domestic water for a mining area, and the purified domestic water and mine water are mainly used for coal preparation plant water, coal face water, domestic miscellaneous water, boiler ash flushing water, car washing water, toilet flushing of office buildings, plant greening and the like.
Example 2 was designed in accordance with the present invention against Daizhuang mine.
The Daizhuang coal mine is a second large mine constructed by Zibo mining group Limited in Ji (Ning) North mining area, the Yuanyue is built in 1998, the production is handed over in 1/26/2000, and the design production capacity is 150 ten thousand t/a. In a water-rich area of a Daizhuang coal mine, the water volume of mine water is large, and the maximum water inflow volume of the mine is 530m3Per h, the current normal water inflow is 450m3And d, the water resource cost also increases year by year, so that the economic burden of enterprises is increased while the water resource is seriously wasted.
The Jining city is located in a seasonal climate region of east Asia, belongs to a seasonal climate of warm temperature zone, mostly deviates south wind in summer, is influenced by heat zone ocean air masses or modified tropical ocean air masses, and is high in temperature and rainy; the north wind is affected by the polar continental air mass in winter, the annual average air temperature of the Shandong cold weather Jining city is 13.3-14.1 ℃, and the average frost-free period is 199 days. The average annual precipitation is about 597-820 mm.
In conclusion, the area where Daizhuang mine is located belongs to seasonal rainfall, is severely deficient in water in winter, has abundant mine water, and needs to purify and recycle the mine water and domestic water.
According to the practical situation of the Daizhuang mine, the comprehensive coal mining mode of 'water retention-water storage-purified water' is realized by adopting strip structured filling, the high-efficiency and safe storage of rainwater in summer and the purification and reutilization of domestic water and mine water are realized, and the strip structured filling protects the coal rock layer from being damaged by a water-resisting layer due to disturbance in the coal mining process and protects underground water resources.
Considering the rainfall of the Daizhuang mine in rainy season and the water consumption of the population, production and the like of the mining area, the diameter of the designed water storage well is 2m, the cross section is circular, and the cross section is rectangular at the position below the generator.
The power of the generator is selected according to the rainfall and the domestic sewage discharge in rainy season, the mixed-flow alternating-current generator is selected at this time, the power is 150kw, and the storage battery is a common lead-acid battery.
The domestic sewage and rainwater division door is selected according to the size of the water storage well, and the size is 2m multiplied by 2.5m multiplied by 0.2 m.
According to the depth of a Daizhuang mine coal layer and the thickness of the coal layer, the selected filling material is a gangue aggregate cemented filling material, the raw materials consist of gangue, fly ash, cement, water and an additive, and the mixture ratio of the components is as follows:
coal gangue 950kg/m3380kg/m of fly ash3Cement 350kg/m3380kg/m of water3The 28-day uniaxial compressive strength of the filling material can reach 15MPa, as mine water contains more metal ions such as chloride ions, sulfate ions, iron ions and the like, rubber powder is added into the gangue aggregate cemented filling material to resist the corrosion of the sulfate ions, a naphthalene-based high-efficiency water reducing agent, a carboxylate early strength agent, a setting accelerator and barium chloride are additionally used, and 20cm of cement mortar is poured on the surface of a filling body in order to prevent domestic sewage and mine water from corroding the filling body for a long time.
According to the actual situation of the Daizhuang mine coal bed, the elastic foundation beam theory is adopted for the design of the strip-type structured filling body, the strip-type structured filling body is optimally selected according to the existing data, the width of the strip-type structured filling body is 4m, the height of the strip-type structured filling body is consistent with the height of the coal bed, the interval is 5m, in order to better control the overlying strata and achieve the effect of water retention mining, the design is widened below the aquifer, and the width of the filling body is 5 m.
Because the rock stratum condition of the bottom plate under the Daizhuang mine is good, the floor does not need to be poured again in the reservoir, but the repair of part of the bottom plate is needed because a part of the floor is damaged in the coal mining process, the repaired material still selects the gangue aggregate cemented filling material, and the stirring is carried out according to the proportion.
The gangue used by the gangue filtering system is gangue generated in the coal mining process and volcanic rock transported from the outside, the ratio of the gangue generated in the coal mine to the volcanic rock transported from the outside is 4:1, and the gangue gradation is as follows: 48 percent of grain diameter of 1-1.5m, 29 percent of grain diameter of 0.5-1m and 23 percent of grain diameter of 0.2-0.5 m.
The method comprises the steps of using a polyaluminium chloride (PAC) flocculant in a primary sedimentation tank, and using an activated carbon adsorption, microfiltration and electrodialysis device in a secondary purification tank.
The power of the water pump is selected from a horizontal centrifugal booster water pump PWT80-65-315DS of Pentair Bintte stainless steel in America.
And all underground lines are connected by adopting waterproof treatment.
When the rainy season comes, all rainwater is stored in an underground reservoir, domestic sewage is discharged into a water storage well after being precipitated on the ground at ordinary times, the rainwater is filtered by waste rocks, is subjected to primary precipitation and secondary purification and is stored in the reservoir, the stored rainwater and clean mine water are mainly used as domestic water for a mining area, and the purified domestic water and mine water are mainly used for coal preparation plant water, coal face water, domestic miscellaneous water, boiler ash flushing water, car washing water, toilet flushing of office buildings, plant greening and the like.
Claims (7)
1. A strip-structured filling, protecting and water storing system for a coal mining area is characterized in that: the bearing structure (5) comprises a strip filling body bearing structure (5), wherein the strip filling body bearing structure (5) is formed by arranging 1-5m wide strip type structure filling bodies at intervals in a goaf, forming a 'filling strip-direct roof' structure control system along with mining and filling, bearing the acting force of an overlying rock stratum and a bottom plate, controlling the movement deformation and the structural damage of the overlying rock stratum and the bottom plate, protecting the overlying hydrous rock stratum and the underlying hydrous rock stratum of the goaf, achieving the purpose of water retention and coal mining, and forming a stable water purification-storage space in the underground goaf; the rainwater collecting system comprises four subsystems of a rainwater ground collecting system, a rainwater underground gangue filtering system (6), a rainwater underground secondary purifying system (7) and a purified rainwater underground reservoir system (8) which are connected in sequence, the domestic sewage collecting system comprises five subsystems of a domestic sewage ground collecting system, a domestic sewage underground gangue filtering system (9), a domestic sewage underground primary sedimentation system (10), a domestic sewage underground secondary purifying system (11) and a purified domestic sewage underground reservoir system (12) which are connected in sequence, the mine water collecting system comprises four subsystems of a mine water underground gangue filtering system (13), a mine water underground primary sedimentation system (14), a mine water underground secondary purification system (15) and a purified mine water underground water storage system (16) which are sequentially connected;
the strip filling body bearing structure comprises filling bodies, a waterproof layer and a cement mortar layer, wherein the waterproof layer is positioned on the surface of the filling bodies, the cement mortar layer is positioned on the surface of the waterproof layer, the spacing of the filling bodies is 2-6m, and the width of the filling bodies is 1-5 m;
the rainwater ground collection system comprises a plurality of diversion channels, a water collecting pool (1) and a water storage well (2), wherein the water storage well (2) comprises a rainwater storage well (17) and a domestic sewage storage well (18), a partition door (19) is arranged between the rainwater storage well (17) and the domestic sewage storage well (18), the diversion channels are connected with the water collecting pool (1), the water collecting pool (1) is connected with the rainwater storage well (17) in the water storage well (2), the diversion channels are uniformly distributed in a coal mining area, the diversion channels are collected in the water collecting pool (1) in an umbrella shape, and a plurality of branches are arranged on two sides of a main trunk of the diversion channels;
the domestic sewage ground collection system comprises a sewage discharge pipe and a sedimentation tank (3), wherein the sewage discharge pipe is connected with the sedimentation tank (3), and the sedimentation tank (3) is connected with a domestic sewage storage well (18) in the storage well (2);
waste rocks in the rainwater underground waste rock filtering system (6), the domestic sewage underground waste rock filtering system (9) and the mine water underground waste rock filtering system (13) all comprise waste rocks with different particle sizes, wherein the content of the waste rocks with the particle sizes of 0.8-1.2m is 45-55%, the content of the waste rocks with the particle sizes of 0.5-0.8m is 25-32%, the content of the waste rocks with the particle sizes of 0.2-0.5m is 15-25%, and the waste rocks with the particle sizes are coal gangue and volcanic rock which are mixed in a mass ratio of 4-5: 2;
the bearing structure of the strip filling body is filled along with mining, so that the purpose of water-retaining coal mining is achieved; a 'filling strip-direct roof' structure control system is formed by strip filling, a stable water storage space is formed in an underground goaf, seasonal precipitation and clean mine water in a mining area are safely and efficiently stored, and surface water is prevented from evaporating; forming a plurality of spaces with different independent functions in the coal seam goaf through narrow-strip filling bodies; the method comprises the steps that a stable water storage space is formed in an underground goaf by filling a strip structure, the capacity of the water storage space of an underground reservoir is calculated according to the distance between filling bodies and the distance between an upper top plate and a lower top plate, a water diversion channel and a water collection tank are arranged on the ground, rainwater is introduced into an underground rainwater and gangue filtering system by using a water storage well, passes through a rainwater secondary purification tank and is finally discharged into the reservoir, and the seasonal rainfall in a mining area is safely, efficiently and reliably stored to prevent surface water from evaporating; storing water resources which are detected to be clean mine water so as to meet domestic water in a dry season of the whole mining area; a plurality of independent spaces are formed in a coal seam goaf through narrow-strip filling bodies, and water resources from different sources are respectively subjected to gangue filtering systems, primary sedimentation systems, secondary purification systems, isolation and storage treatment, so that the water demand of industrial and agricultural production and coal mining working faces in the dry season of a mining area is met.
2. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: a generator-storage generator set (4) is arranged at the position, close to a goaf bottom plate of the coal mining area, of the water storage well (2), wherein a mixed-flow hydroelectric generator is selected as the generator (21), the power is 150-K and 500kw, the voltage is 380V, and a lead-acid battery is used as a storage motor (20).
3. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: the cross section of the well mouth of the water storage well (2) is circular, the cross section of the part below the generator-power storage unit (4) is a rectangular cross section, and the rectangular cross section is 2-5m long, 2-5m wide and 30-40cm thick.
4. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: flocculating agents are arranged in the domestic sewage underground primary sedimentation system (10) and the mine water underground primary sedimentation system (14).
5. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: a fast filter or a gravity type valveless filter is arranged in the domestic sewage underground primary sedimentation system (10) and the mine water underground primary sedimentation system (14), and filter materials comprising anthracite and quartz sand are arranged in the fast filter or the gravity type valveless filter.
6. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: activated carbon, a precision filter and an electrodialysis device are sequentially arranged in the rainwater underground secondary purification system (7), the domestic sewage underground secondary purification system (11) and the mine water underground secondary purification system (15).
7. The fill-and-hold-water storage system with strip-structured coal mining area according to claim 1, characterized in that: the strip filling body bearing structure (5) comprises a filling body, a waterproof layer positioned on the surface of the filling body and a cement mortar layer positioned on the surface of the waterproof layer, wherein the filling body comprises the following components in unit volume and mass: coal gangue: 950kg/m3Fly ash: 380kg/m3Cement: 350kg/m3380kg/m of water3Rubber powder: 50kg/m3And naphthalene-based superplasticizer: 6kg/m3Carboxylate type early strength agent: 4kg/m3And an accelerator: 4kg/m3Barium chloride: 6kg/m3The thickness of the cement mortar layer is 20cm, the interval of the filling bodies is 2-6m, and the width is 1-5 m.
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| CN110107351B (en) * | 2019-04-29 | 2020-12-11 | 中国煤炭地质总局勘查研究总院 | Method for transferring and storing mine water |
| CN113336346A (en) * | 2021-05-24 | 2021-09-03 | 国电建投内蒙古能源有限公司 | Communication roadway type underground transfer sewage treatment system and construction method thereof |
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