54results about How to "Improved heat recovery" patented technology

The present invention is a closed loop system of heat recovery in hot dry rock or in water-containing formations for generation of electrical power. Recovery of heat from such formations is accomplished by way of multiple horizontal levels of generally radially drilled bores from a central shaft. Heat transfer is accomplished either by way of terminal end heat exchangers or by way of heat transfer to conduits extending from the central shaft.

The invention relates to an ascending pipe waste heat insertion-type temperature control thermal expansion decoking heat pipe guiding-out method and device, and belongs to the technical field of coking furnace ascending pipe raw gas waste heat recycling. According to the technical scheme, a steam outlet pipe (13) and a water inlet pipe (14) are bent together to be of an L-type structure (1), the end of the horizontal segment of the L-type structure is provided with a detachable connector (22), the end of the perpendicular segment is provided with an anti-coking head (24), the steam outlet pipe is connected with a steam pocket (9), the water inlet pipe is connected with a water inlet system, raw gas and the water inlet pipe are isolated through the steam outlet pipe, the temperature of the exterior of the steam outlet pipe is not lower than the coking temperature, and meanwhile steam ascends gradually to heat inflowing water, so that the inflowing water is completely gasified. According to the ascending pipe waste heat insertion-type temperature control thermal expansion decoking heat pipe guiding-out method and device, the temperature is detected through a high-temperature thermocouple in the heat exchange process, the water yield of the inflowing water is controlled, and therefore coking of the exterior of the device is avoided; raw gas waste heat can be recycled, completely independent installation is achieved, the problems that a heat exchange device inside an ascending pipe is prone to coking, the ascending pipe is prone to explosion, installation is difficult, and the replacement and maintenance cost is high are solved, and the heat exchange amount is large.

The invention provides an aromatic hydrocarbon purification apparatus and process used in hydrofining of coking crude benzene. The apparatus comprises an extractive distillation tower, a liquid-liquid extraction tower, an aromatic hydrocarbon stripping tower, a crude benzene preheater, a hydrogenated oil preheater, a cooler, an air cooler, a raw material mixer, a discharging mixer and a distributor. The process comprises the following steps: allowing raw hydrogenated oil and a poor solvent N-formyl morpholine to enter into the extractive distillation tower, coupling a gas phase and a liquid phase in the extractive distillation tower and the liquid-liquid extraction tower, extracting a gas phase at a side line of a distillation section of the extractive distillation tower, mixing the gas phase with a tower top discharge, cooling an obtained mixture and allowing the mixture to enter into the liquid-liquid extraction tower for separation into two phases; re-introducing an aromatic hydrocarbon-rich heavy phase into the top of the extractive distillation tower as reflux, with an aromatic hydrocarbon-poor light phase mainly being non-aromatic hydrocarbons; and allowing a rich solvent at the bottom of the extractive distillation tower to enter into the aromatic hydrocarbon stripping tower for separation, wherein pure aromatic hydrocarbon is obtained at the top of the aromatic hydrocarbon stripping tower, and the poor solvent N-formyl morpholine is obtained at the bottom of the aromatic hydrocarbon stripping tower and is recycled. In the flow path of the process, process system engineering methodology is employed for realizing integration of mass and heat and optimization of a comprehensive heat exchange network, thereby realizing recovery of waste heat, improvement of a separation effect of aromatic hydrocarbon and reduction in operating cost.

The invention belongs to the field of urea preparation, and particularly relates to an energy-saving urea production system and a production process thereof. The system comprises a CO2 compressor, an ammonium carbamate pump, a liquid ammonia pump and a urea synthesizer. The system is characterized in that the CO2 compressor is connected with the ammonium carbamate pump and the liquid ammonia pump, the liquid ammonia pump is connected with the urea synthesizer, a falling-film countercurrent medium-pressure decomposing tower and a heater, an ammonium carbamate condenser, an ammonium carbamate separator, a three-stage medium-pressure absorption tower and an evaporative ammonia refrigeration recoverer, a liquid ammonia buffer tank, an inert gas scrubber, a tail-gas ammonia cleaning fine purifier, a low-pressure decomposing tower and a heater, a dimethyl liquid preheater, a horizontal low-pressure absorber, a falling film type pre-evaporator, a one-stage evaporator and a one-stage evaporative condenser, a two-stage evaporator and a two-stage evaporative condenser, and a process wastewater desorption and hydrolysis tower are sequentially connected behind the urea synthesizer in sequence. The energy-saving urea production system has the advantages of low investment, low energy consumption, simple operation, high elasticity and the like, thereby the process technology has considerable economic benefit and social benefit.

The invention relates to a fully dry process purification recovery method for converter gas heat energy and a device. The device is characterized by comprising a dust collecting gas collecting hood, an evaporative cooling flue, a primary dust collecting device, a heat energy recovery device, an anti-explosive wear-resistant variable frequency fan, a silencer, a coal gas analyzer and a switching station communicated successively through a pipeline, wherein an ash outlet of the primary dust collecting device corresponds to a first coarse ash conveying system, an ash outlet of the heat energy recovery device corresponds to a second coarse ash conveying system, and ash outlets of the first and second coarse ash conveying systems correspond to an ash storage bin. The method and the device provided by the invention have the advantages that high-temperature sensible heat of the converter gas is utilized deeply; the temperature of flue gas is continuously cooled 600-700 DEG C from 1000 DEG C in a radiation heat transfer section of the evaporative cooling flue, so that the recovered waste heat quantity and the like are increased.

The invention discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation method which comprises the following steps: respectively reheating fresh synthesis gas and recycle gas, mixing the fresh synthesis gas with the recycle gas, introducing the mixed gas into a first reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the first reactor, guiding the mixture to flow to a first methyl alcohol separator, separating out methyl alcohol, pressurizing the separated gas, preheating, then introducing into a second reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the second reactor, guiding the mixture to flow to a second methyl alcohol separator, separating out methyl alcohol, preheating the separated gas which separately serves as the recycle gas and fresh synthesis gas, mixing the recycle gas and the fresh synthesis gas, and feeding the mixture into the first reactor so as to perform next round of circulating preparation of methyl alcohol. The invention further discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation device. The method is relatively high in single-pass alcohol net value and relatively small in circulation ratio, achieves a ton-alcohol steam yield as high as 1.2-1.3 ton, and is high in energy heat recovery amount.

A system using hybrid Rankine cycles is provided. The system includes a first Rankine cycle system using a first working fluid, the first system producing exergy loss and residual energy from at least one of turbine extraction, turbine condensation and boiler flue gas; and a second Rankine cycle system using a second working fluid to recover the exergy loss and residual energy. The second working fluid comprises a first stream and a second stream, wherein the first stream exchanges heat with the first system via at least one first heat exchanger, and the second stream exchanges heat with the first system via the at least one first heat exchanger and at least one second heat exchanger. A turbine of the first system is configured to allow the first working fluid to exit at a sufficiently high pressure and temperature to provide heat to the second system instead of expanding to a low pressure and temperature and discharging heat to ambient using a condenser.

The present invention relates to a process and a process plant for the production of sulfuric acid from a gas comprising H 2 S and HCN characterized by the following steps; directing said gas to an alkaline absorber containing a liquid ammonia absorbent solution and a material catalytically active in oxidation of H 2 S to elemental sulfur providing a liquid slurry comprising sulfur and coke oven gas absorber liquid, separating at least a portion of said elemental sulfur from coke oven gas absorber liquid by mechanical means of separation as a sulfur sludge, combining said sulfur sludge with a support fuel and a first gas comprising oxygen in or upstream an incinerator, incinerating said mixture, providing an incinerated gas comprising SO 2 and NO x , optionally adding a second gas comprising oxygen to said incinerated gas, selectively removing the formed NO x by chemical reduction with NH 3 , contacting said process gas with a material active in oxidation of SO 2 to SO 3 providing an oxidized process gas, optionally adding water to said oxidized process gas and condensing concentrated sulfuric acid formed in said oxidized process gas.

Disclosed is a converter on-line diagnosis energy-saving and consumption-reducing SADS system. The system solves the problems that in the existing converter steelmaking process, the heat recovery rateof converter gas is low, the energy consumption of converter steelmaking is high, and the gas generated by a converter cannot be effectively utilized. The system is based on a multi-signal-source process analysis means, depends on a metallurgical physicochemical model algorithm in the converter steelmaking process, and guarantees that the converter gas recovery amount and the converter gas heat value are always in an ideal state in the converter steelmaking process through self-adaptive calculation and intelligent analysis, and the converter gas recovery heat is made maximum. Moreover, the optimal converter steelmaking production process rhythm is provided, and the process rhythm not only ensures smooth operation of the steelmaking process but also ensures the maximization of gas recoveryheat. Under the condition that the use amount of the gas consumption end is kept unchanged, more gas can be used for gas-fired boiler power generation, and greater economic benefits can be created for a steel mill.

The invention discloses a nine-stage regenerative extraction steam system of a 1000MW thermal power generating unit turbine. The nine-stage regenerative extraction steam system comprises a condenser, a turbine low-pressure cylinder, a turbine intermediate-pressure cylinder, a turbine high-pressure cylinder and a boiler. The turbine high-pressure cylinder is correspondingly connected with a first high-pressure heater and a second high-pressure heater. The turbine intermediate-pressure cylinder is correspondingly connected with a third high-pressure heater, a deaerator and a fifth low-pressure heater. The turbine low-pressure cylinder is correspondingly connected with a sixth low-pressure heater, a seventh low-pressure heater, an eighth low-pressure heater and a ninth low-pressure heater. Low-pressure drainage pumps are arranged on the seventh low-pressure heater. The eighth low-pressure heater and the ninth low-pressure heater directly drain water to the condenser through an eighth drainage pipe and a ninth drainage pipe respectively. The nine-stage regenerative extraction steam system of the 1000MW thermal power generating unit turbine has the advantages that the number of regeneration stages is increased by one, and therefore thermal efficiency is improved; the problem that because steam pressure is low, unsmooth drainage is probably caused in the low-load operation process is solved; although the number of devices is increased, operating cost is reduced, and accordingly the nine-stage regenerative extraction steam system is more economical.

The invention provides a micro gas turbine plate-fin heat regenerator which comprises an outer casing, a fin assembly and a heat insulation casing. A shell cavity is formed in the outer casing, and the heat insulation casing is coated with the outer casing. The fin assembly is arranged in the shell cavity and comprises a plurality of fins. Each fin is of a hollow structure provided with a fin cavity. A first air inlet communicated with the shell cavity is formed in the inner bottom of the shell. A first air outlet communicated with the shell cavity is formed in the top of the shell. A second air inlet communicated with a fin cavity is formed in the end, close to the top of the shell, of the inner side wall of the shell. A second air outlet communicated with a fin cavity is formed in the other end, close to the bottom of the shell, of the inner side wall of the shell. The plate-fin heat regenerator is provided with an efficient heat transfer surface, larger in heat transfer area per unit volume, light in weight, small in volume, convenient to maintain, high in heat regeneration degree, small in resistance and low in price.

The invention provides a 10kW-level space nuclear energy closed type Brayton cycle thermoelectric conversion system, which is applied to spacecraft power and and is used for converting heat energy generated by an isotope heat source into electric energy and providing electric power for loads such as an electric thruster. The power generation power of the 10kW-level space nuclear energy closed typeBrayton cycle thermoelectric conversion system provided by the invention is 10 kW; a working medium loop is designed according to a closed Brayton cycle; and a working medium is sequentially subjected to a thermodynamic process including adiabatic compression in an air compressor, constant-pressure heating with an isotope source as a heat source, adiabatic expansion in a turbine and constant-pressure cooling. According to the system, the physical properties of the used inert gas working medium are fully considered; the advantages of each component gas in the working medium gas in the aspectsof thermal conductivity, thermal capacity and the like are comprehensively utilized; and by a repeated iteration design, the system has the characteristics of compact layout, high conversion efficiency, high power density, high environmental adaptability and the like and is also suitable for a power system of an underwater vehicle.

The invention discloses a working method of a heat-recovery multi-connected air conditioning unit. When a wind-side heat exchanger works and two water-side heat exchangers do not work, a four-way valve can control refrigerating fluid to pass through the wind-side heat exchanger so as to realize the refrigeration or heat production of the unit; when a first water-side heat exchanger and the wind-side heat exchanger do not work and a second water side heat exchanger works, the four-way valve can control the refrigerating fluid to pass through the second water-side heat exchanger so as to realize whole heat recovery; and when the wind-side heat exchanger does not work and the two water-side heat exchangers work, the four-way valve can control the refrigerating fluid to pass through the two water-side heat exchangers so as to realize whole heat recovery and partial heat recovery. Because of varied selectivity, the invention can choose to operate refrigeration or heat production, or add whole heat recovery or add whole heat recovery or partial heat recovery. The invention has varied selectivity, convenient use and energy saving.

The invention discloses an efficient total heat recovery central air conditioner which comprises a heat recovery and exchange system, a compression motor, a chilled water temperature sensor, a pressure water pump, a condenser, a temperature and humidity sensor and an integrated chip. The heat recovery and exchange system comprises a heat exchanger and a fan arranged on one side of the heat exchanger, and the heat exchanger is provided with a water inlet and a water outlet. According to a refrigerant control method of the efficient total heat recovery central air conditioner, refrigerants in the efficient total heat recovery central air conditioner is automatically adjusted, the phenomena that condensate depression does not exist at the upstream position of a throttling device of the efficient total heat recovery central air conditioner, and low-pressure protection of part of a heat recovery and exchange unit occurs when the ambient temperature is high and the water inlet temperature of the heat-recovery heat exchanger is low are avoided, and the operation range of the efficient total heat recovery central air conditioner is obviously expanded. Moreover, when the water inlet temperature of the heat-recovery heat exchanger is low and the ambient temperature is low, the condensing temperature and exhaust temperature of the efficient total heat recovery central air conditioner are increased forcedly, the heat exchange capacity of the heat-recovery heat exchanger is enhanced, and it is guaranteed that the efficient total heat recovery central air conditioner has high heat recovery quantity and high heat-recovery water outlet temperature.

The invention belongs to the technical field of energy and environment protection, and particularly relates to a high-temperature catalytic combustion device and method for liquid nitrogen washing tail gas. The high-temperature catalytic combustion device for the liquid nitrogen washing tail gas can achieve high-temperature combustion of the liquid nitrogen washing tail gas, recycled heat is high, the recycled heat can be fully utilized, the using range of the heat is widened, and energy saving and emission reducing are achieved. The high-temperature catalytic combustion device is small in equipment number, small in investment cost, low in running cost, small in energy consumption, and easy, convenient and safe to operate. The high-temperature catalytic combustion device is wide in application range of heat recycled for treating the liquid nitrogen washing tail gas, direct conveying to a pulverized coal drying device is achieved, and drying for pulverized coal is achieved; and conveying to sites needing steam heat supplying is also achieved.