37results about How to "Guaranteed gas production" patented technology

The invention discloses an air compression method and system with a self-precooling function. According to the method, air is compressed by multi-stage compression and interstage cooling, a cooling medium is used for recycling interstage compression heat and exergy, the recycled heat is used as a heat source, and cooling capacity is generated by an absorption refrigeration method and is used for precooling to-be-compressed air before each stage. The system mainly comprises three parts, i.e., a compressor unit gas circuit subsystem, a compressor unit water route subsystem and an absorption refrigeration machine subsystem. The air compression method and system are particularly suitable for being used in summer or high temperature environment; when the air is compressed by the air compression method and system, the gas production rate of the compressed air can be ensured, the moisture content of the compressed air is reduced, the pressure ratio of a compressor in each stage is increased, and power consumption in the compression process of each stage is obviously reduced; besides, the interstage compression heat and exergy of all the stages are fully utilized, and the energy usage ratio of the system is further improved.

The invention discloses a two-stage anaerobic treatment system for cassava alcohol wastewater. The system comprises a primary heat exchanger, a high temperature anaerobic fermentation tank, a primary drum screen, a secondary drum screen, a secondary heat exchanger, a sedimentation pool, an air floatation pool, an adjustment pool and a medium temperature UASB reactor. Wastewater goes by the primary heat exchanger for cooling, enters the high temperature anaerobic fermentation tank for high temperature anaerobic fermentation, goes by the two-stage drum screen, the secondary heat exchanger, the sedimentation pool and the air floatation pool for removing suspending matters and partial COD, and enters the UASB reactor for medium temperature anaerobic fermentation. The system has the following advantages: biogas generated in the two-stage fermentation is collected and used, and wastewater enters a subsequent aerobic segment for continuous treatment; and the whole treatment process flow is concise, the management is convenient, the energy consumption of the production and the operation is low, the treatment efficiency is high, and sludge has a less output and is easy to dispose.

The invention discloses a carbon dioxide capturing compression system using flue gas and multistage compressing waste heat. The system comprises a flue gas pipeline and a heating water pipeline. The flue gas pipeline comprises a first heat exchanger and a second heat exchanger, a four-way reversing valve, a first temperature swing adsorption tower unit and a second temperature swing adsorption tower unit, a first three-way valve and a first compressor and a second compressor. The heating water pipeline comprises a water pump, a second three-way valve and a cooling tower. A multistage compressing cooling device formed by multistage of alternately connected heat exchangers and compressors can be connected between the outlet of the second compressor and the outlet of the flue gas pipeline, and the outlet of the last stage compressor is the outlet of the flue gas pipeline; and a water pump is connected in series to the low-temperature sides of all the heat exchangers. According to the system disclosed by the invention, by virtue of multistage compression and intermediate cooling, the compressing energy consumption before carbon dioxide is reduced; by combining the intermediate cooling and flue gas waste heat utilization of the compressor with temperature swing adsorption carbon capturing, the capacity of energy conservation and emission reduction of a coal-fired power plant is ensured; the two groups of temperature swing adsorption towers same in quantity ensure the industrial operating persistence so as to maintain the gas generating capacity of the system.

The invention provides a method for generating coal gas underground through air fracture and micro negative pressure, and belongs to the field of energy development. The method comprises the following steps that air inlet wells and a plurality of gas outlet wells are drilled, then a gasification tunnel is formed along drilled holes in the bottom of a coal seam to enable the air inlet wells and the gas outlet wells to be communicated, and therefore a gasification furnace is formed integrally; the coal seam is fractured through multi-level air pressure raising, igniter is added in an oxidation section between two adjacent wells, the igniter enables partial coal underground to burn, and generated mixed gas is exhausted to a ground well mouth through the gas outlet wells to obtain gas mixture of CO, H2 and CH4; in the burning process, micro negative pressure is formed in the gas outlets of the gas outlet wells and three working sections. The air fracture technology enables fractured coal to be loose, even and convenient to burn, environment pollution is not likely to happen, and gasification efficiency and gas output are guaranteed; the micro negative pressure prevents the generated gas from diffusing and escaping to other directions, and underground water pollution also can be avoided. The method can achieve the purposes of high coal recovery efficiency, low cost, environment friendliness and energy conservation.

The invention discloses a refracturing method and system, and belongs to the field of coal bed gas mining. The refracturing method and system are used for conducting refracturing on a coal bed. The refracturing method comprises the following steps that anti-swelling liquid is injected into a primary fracture system formed by primary fracturing of the coal bed; plugging agents are injected into a primary perforated interval of the coal bed so as to plug the primary fracture system, and the primary perforated interval is formed in the primary fracturing process of the coal bed; perforated operation is conducted on the coal bed and a roof of the coal bed, and a secondary perforated interval is formed; and fracturing liquid and propping agents are injected into the secondary perforated interval, and a secondary fracture system is formed in the coal bed. According to the refracturing method and system, by injecting the anti-swelling liquid into the primary fracture system formed through the primary fracturing of the coal bed and injecting the plugging agents into the primary perforated interval of the coal bed so as to plug the primary fracture system, the fracture systems formed through refracturing are easier to extend and expand to areas without fractures, and accordingly the gas production and the recovery ratio of the coal bed are guaranteed.

The invention relates to a briquette for a gas producer produced by high volatile bituminous coals and a method. The briquette can meet the requirements of the two-stage fixed bed gas producer for coal quality. The briquette is characterized in that: aiming at the characteristics of high bituminous coal forming elasticity, anthracite coal with the weight 10-20% of that of the bituminous coal is added by weight percentage and is taken as a carbon skeleton, thereby improving the cold strength of the briquette formed by the bituminous coals; modified clay with the weight 4-6% of that of the bituminous coal is added by weight percentage and is taken as a thermal intensifier, and simultaneously a sodium humate binder with the weight 4-6% of that of the bituminous coal is formed by cold pressing, thereby not only improving the cold strength of the briquette, but also not reducing the fixed carbon content of the briquette so as to ensure the heating value and gas production quantity of the briquette; and a small amount of modified clay is added to improve the thermal strength and thermal stability of the briquette, and can be used as a catalyst in the gasification process simultaneously,thereby improving the gasification activity of the briquette.

The invention discloses a shale gas production promoting method based on combination of blasting fracturing and hydraulic fracturing. The method comprises the following steps that firstly, a blasting fracturing horizontal well is punched, then a perforation fracture is formed in the blasting fracturing horizontal well, a first blasting hole packer is installed, a hole sealing section is formed, and if the value required by explosion is reached in the hole sealing section within a set time, blasting gas is triggered to conduct primary impact fracturing on the perforation fracture; if the value required by explosion is not reached, blasting gas is supplemented into the hole sealing section, then one-time blasting fracturing is completed, next, the above process is repeated, a blasting fracturing fracture network is formed around the blasting fracturing horizontal well through retreating blasting fracturing, and hole sealing is conducted; and finally, a hydraulic fracturing horizontal well is punched below the blasting fracturing horizontal well, a hydraulic fracturing fracture area is formed around the hydraulic fracturing horizontal well by adopting a retreating hydraulic fracturing method, wherein the fracture area can be in communication with the blasting fracturing fracture network, and at the moment, shale gas extraction work is conducted on a shale reservoir through the hydraulic fracturing horizontal well.

The invention relates to a method for processing hydrogen-nitrogen mixed gas with high purity and low dew point. The hydrogen-nitrogen mixed gas processed by the method has stable yield and low dew point. The method is characterized in that liquid ammonia is sent to an evaporator through a filter; after gaseous ammonia comes out from the evaporator, the pressure of the gaseous ammonia is controlled at 0.05 Mpa through an adjusting valve; heat of pyrolysis gas is absorbed through a rotor flowmeter and a heat exchanger, is preheated and enters a cracking furnace; ammonia gas is heated to a temperature between 800 and 850 DEG C and is decomposed into the hydrogen-nitrogen mixed gas under the action of nickel as a catalyst; the hydrogen-nitrogen mixed gas is cooled through the heat exchanger and a water cooler and enters a purification system; an adsorption tower of the purification system is provided with two sets of towers in parallel connection; each set of the towers is formed by two stages of the adsorption towers in serial connection; the mixed gas passes through a primary adsorption tower and a secondary adsorption tower; and moisture and residual ammonia are removed through molecular sieves in the adsorption towers.

The invention discloses a casting mold for a large-size disc type complicated-structure part. The casting mold comprises a casting mold body; the casting mold body is provided with a disc-like part cavity, a plurality of riser cavities, a plurality of air outlets and a grouting system; the grouting system comprises at least two iron inlets, at least two liquid iron main flow channels, a central flow dividing chamber, a plurality of liquid iron branch flow channels and a plurality of filters; the liquid iron main flow channels and the liquid iron branch flow channels are arranged at the bottomof the casting mold body; and the central flow dividing chamber is arranged at the central position of the bottom of the casting mold body. The grouting system is reasonably distributed, so the grouting time can be greatly shortened, and stable iron feeding is guaranteed. The riser cavities and the air outlets are arranged in a targeted manner in order to guarantee the air generation quantity of the cavities and shrinkage compensation of the riser. The invention also discloses a casting method, and the casting method adopts the casting mold which is combined with graphite chill iron and mold weight, thereby effectively solving the casting problems such as shrinkage, loosening, slag inclusion, cold shut and deformation which are easily generated in a casting process.

The invention discloses a shale gas reservoir multi-branch well detonation pressure reinforced extraction method. The shale gas reservoir multi-branch well detonation pressure reinforced extraction method comprises the following steps that firstly, a vertical well and a horizontal well are dug to extend into a shale reservoir, and a plurality of fishbone-shaped branch wells are laterally drilled at different positions of the horizontal well through a jet drill bit; then blasting materials are placed in the fishbone-shaped branch wells, and blasting hole packers are installed to form hole sealing sections; the explosive is ignited and detonated through an ignition head, and impact fracturing is carried out on shale around the fishbone-shaped branch wells by high-temperature and high-pressure gas and detonation impact waves generated by explosion, so that explosive cracks are generated around the fishbone-shaped branch wells; finally, hydraulic fracturing is adopted to enable fracturing fluid to enter the branch wells, crack expansion fracturing is carried out on the fire blast cracks around the branch wells to enable the adjacent fire blast cracks to communicate with one another, and finally a crack network is formed around each branch well; and after completion, the shale gas in the shale reservoir enters each branch well from the fracture network and reaches the horizontal well after being desorbed, and finally the shale gas extraction work is carried out on the shale reservoir through the vertical well and the horizontal well.

The invention relates to an unconventional gas reservoir horizontal well gas lift water draining gas production device. The device comprises multiple casings (1), multiple oil pipes (2), a compressor(4), a pressurizing main pipe (5), multiple pressurizing branch pipes (3) and a control main unit. One oil pipe (2) and one pressurizing branch pipe (3) are inserted in each casing (1), an annulus isformed between each oil pipe (2) and the inner wall of the corresponding casing (1), the pressurizing branch pipes (3) are connected with the compressor (4) through the pressurizing main pipe (5), a pressure sensor is mounted in each annulus, electromagnetic valves are mounted on each oil pipe (2) and each pressurizing branch pipe (3), the signal output ends of the pressure sensors are electrically connected with the control main unit, and the signal output end of the control main unit is electrically connected with multiple electromagnetic valves. The control main unit is used for carrying out circular pressurizing on the casings (1), the gas production rate of multiple gas wells on one platform can be ensured, the production cost is reduced, production efficiency can be improved, and meanwhile, progressive decreasing of formation pressure can be relieved.

A spiral flow stirring type biological fermentation device is disclosed. The device includes a biogas digester main body, a stirring body and a drive assembly. The stirring body includes a lifting bar and a spiral plate. The lifting bar is vertically disposed at the center of the biogas main body. The spiral plate is fixed to the lower end of the lifting bar. The drive assembly includes a screw thread insert and a motor. The screw thread insert sleeves the lifting bar and is rotatably connected to the biogas digester main body around the axis of itself in a unidirection manner. The screw thread insert and the lifting bar are connected through screws to form a lead screw nut pair. The lifting bar is slidingly connected to the biogas digester main body around the axis of itself in a unidirection manner. The device achieves uniform and full stirring of a material liquid through up-down floating of the spiral plate, facilitates hull breaking and ensures the gas yield of the biogas digester.

The invention discloses a die-casting release agent for an aluminum alloy structural part. According to the formula, specially-made pentaerythritol polyester is used for replacing a wax component, the demolding performance is guaranteed, meanwhile, the gas forming amount is effectively reduced, and the porosity is effectively reduced. Meanwhile, the components of the release agent and the characteristics of an application process are fully considered, the pH difference between a release agent diluent and a process waste liquid is utilized, the stability requirement of the diluent is met, meanwhile, the waste liquid treatability is improved, meanwhile, due to the combination of the organic acid and the organic amine, when the release agent waste liquid is treated, the combination can form a synergistic effect with a waste liquid treatment agent PAC, and the separation degree of the waste liquid is improved.

The invention discloses a device for heating a methane tank. The device for heating the methane tank comprises a methane wall hanging stove; a hot water outlet pipe of the methane wall hanging stove is provided with a heat exchange coil pipe; the heat exchange coil pipe is arranged in a heating water tank; a water return pipe of the heat exchange coil pipe is connected to a cold water inlet pipe of a water replenishing hopper of the wall hanging furnace; one side of the heating water tank is provided with a hot water pump; a water pipe is communicated between the water inlet of the hot water pump and the water outlet of the heating water tank; a water outlet pipe of the hot water pump is connected with a heater in the tank; a water return pipe of the heater in the tank is connected to the other side of the heating water tank through a sensor; and a water replenishing hopper of the water tank is arranged above the heating water tank. The device for heating the methane tank has a simple structure, and can be used safely and reliably, and effectively guarantee the year-round gas production rate of the methane tank.