115results about How to "Small volume flow" patented technology

The invention belongs to the technical field of gas liquefaction and relates to a mixed refrigerant circulation and nitrogen expansion circulation combinational refrigeration type natural gas liquefying method. The method comprises the following steps of: allowing natural gas subjected to pretreatments such as acid gas removal, dehydration and the like to enter a natural gas liquefying section cooling box; performing refrigeration by vaporizing the mixed refrigerant in the liquefying section cooling box and controlling the pressure to be 4 to 10 Mpa so as to liquefy the natural gas under high pressure, wherein the temperature of the liquefied natural gas (LNG) departing from the liquefying section cooling box is between -75 and -110 DEG C; cooling the LNG to about -150 DEG C after the LNGenters a supercooling section cooling box; reducing pressure to be the pressure of a storage tank by using a liquid expander and further cooling to about -160 DEG C; and then compressing the LNG to serve as fuel gas. The method has the advantages of simple technical process, high reliability, high liquefaction rate and suitability for industrialized production.

A valve arrangement (16) for a geothermal steam turbine generator (10) comprises first and second steam control valves (18, 20) for regulating the supply of steam to the steam turbine generator (10). The first and second steam control valves are arranged in parallel in a steam supply line (24) and the first steam control valve (18) has a smaller fully-open diameter than the second steam control valve (20). The first steam control valve (18) is arranged to regulate the volume flow rate of steam supplied to the steam turbine generator (10) during a speed-control phase, until the steam turbine generator (10) attains a predetermined rotational speed at which it can be connected to an ac electrical system. The second steam control valve (20) is arranged to regulate the volume flow rate of steam supplied to the steam turbine generator (10) during a load-control phase, after the end of the speed-control phase, once the steam turbine generator (10) has attained the predetermined rotational speed and is connected to the ac electrical system.

The invention discloses a full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling comprises a ground manifold connecting structure and a drilling assembly structure connected with the ground manifold connecting structure; and the ground manifold connecting structure comprises a gas injection unit, a pressure relief unit, a flowmeter, a ground gas injection manifold, a high-pressure gas injection hose, an erosion-resistant gooseneck, a high-pressure reverse circulation sand discharging hose, a ground reverse circulation sand discharging pipeline and a normal circulation gas drilling sand discharging pipeline. Double-wall drilling rigs are used in a full well section, conventional tools such as single-wall drilling rigs and gas and water mixing joints are omitted, air serves as a circulatory medium in the full well section, and reverse circulation can be implemented without mud or other drilling fluid. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling is particularly suitable for well sections with serious water shortage, serious well leakage or incapability of implementing air lift reverse circulation drilling.

The invention discloses a flue gas electric dust remover. The flue gas electric dust remover comprises an inlet flue gas box, an outlet flue gas box, a high-pressure electrostatic dust collection electric field positioned between the inlet flue gas box and the outlet flue gas box, and a heat exchange device arranged in the inlet flue gas box. The flue gas electric dust remover can reduce the temperature of flue gas before the flue gas enters the high-pressure electrostatic dust collection electric field, so the volume flow rate of the flue gas to be treated which enters the electric field is reduced, and the flow velocity of the flue gas in a flue gas channel of the electric field is correspondingly reduced; meanwhile, the flue gas temperature is reduced, so the dust specific resistance of the flue gas is reduced, and the dust removal efficiency of the electric dust remover is improved; in addition, the heat exchange device is arranged at the inlet flue gas box, so the inner space of the inlet flue gas box on the conventional electric dust remover can be fully utilized, and additional occupied space is not increased while the dust removal efficiency is improved, namely the flue gas electric dust remover has the advantages of compact structure and contribution to system and process arrangement. The invention also discloses a flue gas dust removal system with the flue gas electric dust remover.

The invention provides a heat pump type hot water supply apparatus, comprising a cascade circulation unit, comprising: a cascade circulation heat exchanger making a first coolant of a low temperature refrigeration circulation perform heat exchange with a second coolant of a high temperature refrigeration circulation, the water coolant heat exchanger heating water during condensation of the secondcoolant of the high temperature refrigeration circulation is connected with a position requiring heat supply and a water circulating path. The heat pump type hot water supply apparatus comprises a coolant injection path and a gaseous coolant adjustment valve. The coolant injection path may be split between a cascade heat exchanger and an evaporator of a low temperature refrigeration cycle to inject coolant into a low pressure side compressor, or between a water coolant heat exchanger and a cascade heat exchanger to inject coolant into a high pressure side compressor of a high temperature refrigeration cycle. The gaseous coolant adjustment valve may be provided in the coolant injection path and is adjusted to correspond to a load of a destination. Via the above structure, high temperature water can be effectively supplied to places requiring hot water supply, reduction of heating efficiency due to outdoor low temperature in cold zones can also be effectively prevented.

The invention provides a steam secondary heating system. The system comprises a steam turbine and a secondary reheater, wherein the steam turbine comprises a high-pressure cylinder, intermediate-pressure cylinders and a low-pressure cylinder which are connected in sequence; the secondary reheater is arranged on the exterior of a boiler, and is connected with the exhaust port of one intermediate-pressure cylinder of the steam turbine and the air inlet of the other intermediate-pressure cylinder or the low-pressure cylinder of the steam turbine; the secondary reheater produces high-temperature reheated steam, and introduces the high-temperature reheated steam into the other intermediate-pressure cylinder or the low-pressure cylinder. According to the steam secondary reheating system provided by the invention, the investment on the secondary reheating system is greatly reduced while the efficiency is improved, so that the steam secondary reheating system has the advantages of excellent investment income and technique economical efficiency.

The invention relates to a hydrostatic drive system, having a conveying volume flow adjustable pump, wherein the pump is set to supply for at least one consumption unit; a conveying volume flow adjusting device for the pump controls toward the direction of increasing the conveying volume flow by means of the preset signal and controls towards the direction of reducing the conveying volume flow according to the hydraulic reset signal of the volume flow which is conveyed excessively; a circulating pressure balance is set to generate a reset signal at the reset signal generating position; a pressure adjusting valve is set to control the conveying volume flow adjusting device of the pump, and can be loaded by a preset signal. The pressure adjusting valve is made as a pre-control pressure adjusting valve, and is provided with a first control position towards the direction of reducing the conveying volume flow and a second control position towards the direction of increasing the conveying volume flow; and a pre-control valve is set and is controlled by a hydraulic pressure reset signal, and can excessively control the load of the preset signal through the pressure adjusting valve according to the hydraulic reset signal.

The invention discloses a compressed air cold conveying cooling system for a mine and a compressed air cold conveying cooling method. The compressed air cold conveying cooling system is formed by sequentially connecting an air compressor, a natural cold source subsystem, a manual cold source subsystem, a compressed air injection and air supply device through a compressed air conveying pipeline, wherein the air compressor, the natural cold source subsystem and the manual cold source subsystem are arranged on the ground, and the compressed air injection and air supply device is arranged on an underground mine working surface. The natural cold source subsystem is a water cycle cooling passage connected by a first level cooling tower and a first level cooling sprinkling chamber through a pipeline for pre-cooling compressed air. The manual cold source subsystem is water cycle cooling passage sequentially connected by a second level cooling tower, a second level sprinkling chamber and a refrigerating unit through the pipeline through the pipeline for manually cooling the compressed air. Due to the fact that natural cold source is utilized to conduct pre-cooling on the compressed air, refrigeration load of manual refrigeration equipment is greatly reduced, in winter or a transition season, the manual cooling system does not even need to be operated, and then operating cost of the compressed air cold conveying cooling system is greatly reduced.

The invention relates to a part control phase change air preheating system and an air preheating method. The part control phase change air preheating system and the air preheating method well solve the coupling problem of traditional air preheater low temperature corrosion and heat efficiency, an operating method of the air preheating system can be timely adjusted according to actual operation parameters, adjusting capability is greatly increased, and not only is economy and high efficiency of a thermal circulation system guaranteed, but also security and adaptability of the air preheating system can be improved.

The invention discloses a gas drilling ground manifold connecting structure. The gas drilling ground manifold connecting structure comprises a gas injection unit, a pressure relief unit, a flowmeter, a ground gas injection manifold, a high-pressure gas injection hose, an erosion-resistant gooseneck tube, a high-pressure reverse circulation sand discharging hose, a ground reverse circulation sand discharging pipeline and a normal circulation gas drilling sand discharging pipeline. The ground manifold connecting structure is used in a full-well-section self-suction type reverse circulation gas drilling system, conventional tools such as single-wall drilling tools and gas and water mixing joints are omitted, air serves as a circulatory medium in a full well section, and reverse circulation can be implemented without mud or other drilling fluid. The gas drilling ground manifold connecting structure is particularly suitable for well sections with serious water shortage, serious well leakage or incapability of implementing air lift reverse circulation drilling.

The invention discloses a device and a method for comprehensively carrying out desulfurization, denitration and dioxin removing on steel sintering flue gas. The device mainly comprises a GGH (Gas Gas Heater), a flue gas heating furnace, an ammonia injection grid, an SCR (Selective Catalytic Reduction) reactor, a flue gas-water heat exchanger, a booster fan, a circulating water pump, a desulfurization tower, a chimney and the like. The method adopts a technology of desulfurizing after denitrating and is characterized by firstly accessing sintering flue gas after dust removing to an SCR flue gas denitration device after passing through a main exhaust fan, thus removing NOX and the dioxin; then enabling the sintering flue gas to enter a wet desulfurization tower to desulfurizing, and finally enabling the sintering flue gas to be subjected to standardized emission through the chimney. According to the device and the method, disclosed by the invention, in one hand, the sintering flue gas can be subjected to standardized emission, and the phenomenon that white smoke is discharged by the chimney is removed; meanwhile, on the other hand, the heating energy consumption of the flue gas is reduced, and the energy source is saved.

The invention relates to an external heat radiation regenerative oil shale dry distillation furnace. The furnace is provided with a plurality rows of alternately arranged dry distillation chambers and combustion chambers; each row of combustion chambers is formed by a plurality layers of independent combustion channels; heat generated by combustion is transferred to oil shale in the dry distillation chambers with heat radiation and heat conduction manners with lattice-wall-structured heat conduction walls. With a gasification section, a cooling section, cooling water jackets and steam nozzle devices on the lower part of the dry distillation furnace, carbon residue in semicoke can be fully recycled, and semicoke and ash residual heat can be recycled. Water gas generated by the reaction of semicoke and steam is used as a medium for bringing out oil shale pyrolysis oil gas, such that outlet gas amount is low, dry distillation gas purity is high, and dry distillation gas heat value is high. The daily processing capacity of the dry distillation furnace can by higher tan 500t, and an oil yield can be higher than 90%. Water and electricity consumptions are low, and an auxiliary recovery system is small. With existing external heat dry distillation technologies, semicoke carbon residue cannot be utilized, thermal efficiency is low, maintenance is difficult, and yield is low. With the dry distillation furnace, the above problems are solved. The dry distillation furnace is especially suitable for water-deficient areas.

The invention discloses an oil shale external heat radiation type retort. Under the condition that the cost is not increased remarkably, a combustion chamber is added on a retort body, a combustion gas pipe and a combustion-supporting air pipe are connected onto the combustion chamber, gas and air are combusted in the combustion chamber through a combustor, and heat is transferred to an oil shale in a destructive distillation chamber through a combustion chamber furnace wall in a heat radiation mode, namely the heat required by oil shale temperature destructive distillation is provided by the external heat radiation instead of an original gas heat carrier. Therefore, the temperature in the combustion chamber is ensured to be stable, and heat quantity is utilized fully. Produced net retorting gas is high-calorific-value retorting gas produced through shale low-temperature destructive distillation, retorting gas amount of a furnace outlet per ton of shale is about 40Nm<3>, and the volume ratio of H2 content in the retorting gas is not smaller than 50%. The volume flow rate of the retorting gas is reduced, accordingly the load of a follow-up oil recovery workshop section is lightened, and public and auxiliary facilities are decreased.

The present invention relates to a self-propelled surface milling machine, preferably in the form of an asphalt-milling machine, snow-milling machine or Surface Miner, having a mill roll which is drivable about a rotational axis, and a mill roll drive comprising an electrical motor which is accommodated within the mill roll, wherein stator and rotor of the electrical motor are accommodated within a dust and air-tightly sealed motor housing. It will be suggested to associate a cooling device comprising a closed circuit liquid cooling system to the electrical motor located within the milling roll body. Due to the high heat capacity of a suitable coolant, such as oil or mixed water and glycol small volume flows and hence small conduit cross sections will be sufficient. On the other hand, any incorporation of dust into the mill-roll drive as well as any formation of dust by discharge air can be avoided by the closed form of the circuit liquid cooling system.