901results about How to "Lower exhaust gas temperature" patented technology

The invention discloses a coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system which comprises a low-temperature regenerator, a precooler, a main compressor, a re-compressor, a high-temperature regenerator, a boiler, a high-pressure turbine, a low-pressure turbine and an electric generator. The boiler is composed of a combustion channel, a main heat exchange channel and a tail flue in the smoke flowing direction, wherein the combustion channel, the main heat exchange channel and the tail flue are communicated in sequence; a water-cooled wall and a reheating water-cooled wall are sequentially arranged in the combustion channel in the smoke flowing direction; a high-temperature superheater and a high-temperature reheater are sequentially arranged in the main heat exchange channel in the smoke flowing direction; a baffle, a coal economizer and a low-temperature coal economizer are sequentially arranged in the tail flue in the smoke flowing direction, and a low-temperature reheater and a lower-temperature superheater are arranged on the two sides of the baffle. According to the coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system, optimal combining of the coal-fired boiler and the supercritical carbon dioxide Brayton cycle can be achieved, and the heat exchange efficiency of the high-temperature regenerator, the thermal efficiency of the boiler and the efficiency of the power generation system are high.

An exhaust system(10) for a lean-burn internal combustion engine (12) comprises a first substrate monolith (16) comprising a catalyst for oxidising nitric oxide (NO) comprising a catalytic oxidation component followed downstream by a second substrate monolith (18) which is a wall-flow filter having inlet channels and outlet channels, wherein the inlet channels comprise a NO x absorber catalyst (20) and the outlet channels comprise a catalyst for selective catalytic reduction (22) of nitrogen oxides with nitrogenous reductant.

The controller includes combustion mode switching means for decreasing an exhaust gas temperature in the spark ignition combustion immediately before the combustion mode switching based on an estimated exhaust gas temperature immediately before the combustion mode switching, or for decreasing an EGR amount in the HCCI combustion immediately after the combustion mode switching.

A greenhouse environment control system generates a CO₂-enriched air which is supplied to a greenhouse at a controlled temperature suitable for plant growth. An absorption chiller reduces temperature of a CO₂-containing stream of processed gasses from an engine. A mixing and blending unit maintains CO₂ at an acceptable concentration for enhanced plant growth and human occupation. An HVAC system modulates temperature and positively pressurizes the greenhouse with the CO₂-enriched air to reduce risk of contaminant intrusion. Misting further controls temperature. Retractable shades regulate light supplied to plants and solar gain.

The invention is an electric generator system using low temperature afterheat of large-scale dry cement production line, which has two kiln head double-pressure afterheat boilers for heating, producing the whole low pressure steam and simultaneously producing partial high-pressure steam; a kiln tail afterheat boiler mainly for producing high pressure steam; the high pressure steam produced by the two afterheat boilers are mixed and then enter through pipeline into a steam -supply and -condensing steam turbine, and the low pressure steam enters in the steam turbine through steam supply pipeline; the blast steam at the tail of the turbine enters in a condenser, the condensed water enters in a vacuum deoxygenator through a condensed water pump and pipeline, the deoxygenated water in the deoxygenator is supplied through water supply pump into the boiler; the exhaust gas produced by a kiln tail preheater of cement production line is led in the kiln tail afterheat boiler through reformed pipeline.

An exhaust system (1) is provided with an exhaust passage that allows exhaust gas discharged from an internal combustion engine to pass therethrough, an exhaust emission control unit including a catalyst (2,3) such as a three-way catalyst (27) to purify the exhaust gas, and an exhaust heat collecting unit that converts thermal energy of the exhaust gas into electric energy. The exhaust passage (25) is formed in the center of the exhaust system provided with the exhaust emission control unit. By-pass passages (26) are formed at both sides of the exhaust passage (25) through which the exhaust gas flows without passing through the exhaust emission control unit. The exhaust heat collecting unit (29) is provided on the outer side of each of the by-pass passages (26).

A fuel nozzle for use in a gas turbine combustor is provided having the capability of injecting multiple fuel types as well as steam for NOx reduction. Combustion dynamics within a combustor due to the mal-distribution of steam are controlled by the placement of a meterplate at the steam inlet, such that the meterplate reduces steam velocity and increases steam pressure drop. A higher pressure drop reduces the sensitivity of the combustion process to upstream steam supply variations. A method for providing uniform steam flow to a plurality of fuel nozzle assemblies about a gas turbine engine is also disclosed.

The invention discloses a rotary air preheater dust-blocking-prevention synergy sealing method and system. The dust-blocking-prevention synergy sealing method includes the steps that air leaked from the heat end is guided or extracted to the cold end from the heat end, and local heat exchange elements are purged and heated. The rotary air preheater dust-blocking-prevention synergy sealing system comprises a heat end primary air/smoke side sector sealing box, a heat end primary air/secondary air side sector sealing box and a cold end secondary air/smoke side sector sealing box, and further comprises a heat air leakage air flue; the heat end primary air/smoke side sector sealing box and the heat end primary air/secondary air side sector sealing box are each provided with an air inlet, one end of the heat air leakage air flue is in butt joint with the air inlets, and the other end of the heat air leakage air flue extends to a cold end secondary air highest-temperature module. By means of the rotary air preheater dust-blocking-prevention synergy sealing method and system, H2SO4 drops and liquid state NH4HSO4 are gasified while the air leaked from a preheater is reduced, and the aim of removing accumulated dust is achieved; the rotary air preheater dust-blocking-prevention synergy sealing method and system have the advantages of reducing the boiler smoke discharging temperature, restraining the accumulated dust of the preheater, reducing the air leakage rate, prolonging the service life of the heat exchange elements and the like.

The invention relates to a system for reducing discharge smoke temperature of a power station boiler and belongs to the technical field of waste heat recovery, and the system is characterized that a heat transfer pipeline is arranged in the hot primary air pipeline of the boiler, the two ends of the heat transfer pipeline are respectively connected with a water inlet pipeline and a water outlet pipeline, the other ends of the water inlet pipeline and the water outlet pipeline are connected to a heater on the secondary air inlet air flue of an air pre-heater; and simultaneously a bypass flue is additionally arranged, thus the original smoke is divided into two paths, one path of the original smoke is sent into the air pre-heater through the original flue, and the other path of the originalsmoke is sent into a low-pressure high-temperature economizer through the bypass flue. The hot primary air is utilized to heat the cold secondary air, thereby improving the air temperature of a secondary air inlet; the primary air temperature is controlled by changing the quantity of a cooling medium in the heat transfer pipeline, thereby reducing the amount of the cold primary air doped in a coal pulverizing system; and a method of increasing the amount of the smoke in the bypass flue is adopted, thereby reducing the temperature of the discharge smoke. On the premise of ensuring the temperature of the secondary air, the surplus heat of the primary air is recycled, thus the coal consumption of the boiler and the heat rate of a steam turbine are reduced, and the economical efficiency of a power plant is improved.

The invention discloses a condensing constant temperature gas water heater, comprising a gas distribution device, an inflamer unit and a flame induction system which are arranged on the upper part of the gas distribution device, a cold water inlet pipeline and a water flow sensor which is connected with the cold water inlet pipeline, a gas inlet pipeline, a hot water outlet pipeline, a condenser which is arranged on the upper part of the heater and is provided with a pipe coil and a main heat exchanger which is communicated with a mild water outlet pipe of the condenser, wherein, the lower part of the condenser is communicated with a condensed water processor through a condensed water drain pipe and is communicated with a regulation and control part for adjusting the temperature and the gas amount as well as the amount of wind; the regulation and control part comprises a computer board, a hot water temperature sensor which is in electric connection with the computer board, an over temperature controller, a frequency conversion fan and a gas proportional valve. The invention is based on a forced exhaust type heater and is provided with an independent stainless steel sylphon bellowss pipe coil type heat exchanger outside and realizes the complete separation of the primary heat exchange, the secondary heat exchange and the collection of condensed water. Moreover, the thermal efficiency is up to more than 96 percents, the exhaust temperature is reduced to about 100 DEG C, the infection of condensed water on the main heat exchanger is effectively reduced, and the service life of the heater is guaranteed.

The invention discloses a heat accumulation type oxygen-enriched combustion method and apparatus, gas and oxygen or other gases are intensively mixed at oxygen mixing showerhead of the heat accumulation type oxygen-enriched combustor, and are sprayed into a mix gas duct arranged at center of a heat accumulation chamber, the intensively mixed gas is mixed again with combustion air pre-heated to 900-1000 DEG C at the showerhead of the combustor to combust; according to the invention, the heat accumulation type oxygen-enriched combustion apparatus comprises two heat accumulation type oxygen-enriched combustors, each of which comprises a heat accumulation chamber, a heat storage, mixture gas duct and a combustor showerhead, the heat accumulation chamber communicates with an air chamber, the air chamber communicates with a four-way valve, the oxygen mixing showerheads are separately arranged on ends of gas duct and oxygen duct. The method and device, employing the invention, have compact conformation, energy conservation, also can use low-calorie fuels as combustion air, can remarkably reduce exhaust smoke level and reduce smoke discharging temperature.

The invention discloses a mixed working medium thermal circulating system and method for power and refrigeration cogeneration. In the system, an ammonia and water mixture is utilized as a working medium, and the middle/low temperature heat is utilized as a heat source. The method comprises the following steps: heating the ammonia water working medium to obtain superheated steam; introducing the superheated steam into a turbine to do work; introducing the exhaust steam of the turbine into a rectification tower to supply heat for the rectification process; introducing the ammonia generated by the rectification tower into an evaporator after condensing, undercooling and throttling; throttling a dilute solution subjected to waste heat recovery, introducing the throttled dilute solution into aabsorber, mixing with the ammonia from the evaporator and condensing; and introducing a heat source into a steam generator firstly, and then introducing the heat source into a waste heat solution heat exchanger. The steam generator adopts the ammonia water strong solution as the working medium, the variable temperature evaporation feature of the ammonia water strong solution is well matched with the temperature of the heat source, thus the irreversible loss of the heat exchange process in the steam generator is reduced; simultaneously the exhaust steam of the turbine directly enters into the rectification tower to supply the rectifying heat without condensation, thus the irreversible loss caused by the variable temperature condensation of the ammonia water working medium is avoided; and the mixed type heat transfer is adopted, thus the irreversible loss of the heat exchange process is reduced.

The invention discloses a control system and control method for outlet temperature of a novel coal mill. The control system comprises a controller, a coal mill outlet temperature detector and a coal mill hot air damper, wherein the coal mill outlet temperature detector is mutually connected with the controller; the controller is connected to the coal mill hot air damper. Compared with an existing control method, the control method disclosed by the invention can overcome the defects existing in an existing coal mill outlet temperature control method that a coal mill outlet temperature upper limit value is only set aiming at specific coal, the frequent change of the quality of coal supplied by the coal mill cannot be adapted, and a coal mill outlet temperature running value is low. According to the control system and the control method disclosed by the invention, the automatic level of coal mill operation can be improved, the outlet temperature of the coal mill is effectively improved, the power consumption generated during coal milling of the coal mill is reduced, and the carbon content of a product after pulverized coal combustion can be reduced.

The invention discloses a gas-fired boiler afterheat recovering system and a gas-fired boiler afterheat recovering method. A bypass flue is parallelly connected onto a main flue, a bypass flue butterfly valve, a boiler coal economizer, an air preheater and a condensing type heat exchanger are sequentially and serially connected onto the bypass flue, the bypass flue is communicated with a bypass chimney, a water inlet of a heat exchange pipe of the boiler coal economizer is connected with a water tank through a water supply pipeline, a water outlet of the heat exchange pipe is communicated with a boiler through a pipeline, an air inlet of a heat exchange pipe of the air preheater is communicated with a fan through a pipeline, an air outlet is communicated with a boiler combustion-supporting air inlet pipe through a pipeline, a water inlet of a heat exchange pipe of the condensing type heat exchanger is communicated with the water tank through a descending pipe, and a water outlet is communicated with the water tank through an ascending pipe. The gas-fired boiler afterheat recovering system and the gas-fired boiler afterheat recovering method have the advantages that the structure is simple and compact, the size is small, the boiler smoke discharge temperature is lowered to 40 to 50 DEG C, in addition, all recovered heat is used for a boiler system, the boiler smoke discharge temperature is greatly lowered, the boiler heat efficiency is greatly improved up to more than 100 percent, and the goal of greatly improving the utilization rate of energy sources is reached.

An internal combustion engine (1) comprises a fuel injector (9), a filter (13) which traps particulate matter in exhaust gas, and a catalyst (14) which oxidizes unburnt fuel or carbon monoxide in the exhaust gas on the upstream side of the filter (13). When regeneration of the filter (13) is required, a controller (21) determines a post-injection fuel injection timing and a post-injection fuel injection amount of the fuel injector (9) on the basis of an upstream exhaust gas temperature (Texh) and a catalyst temperature (Tcat) (S16, S17, S19, S20, S22, S23, S25, S26, S28), thereby optimizing the regeneration temperature condition of the filter (13).

The invention discloses an HY type dry distillation furnace which is characterized by comprising a plurality of dry distillation subunits, wherein each dry distillation subunit comprises a charging device, an oil gas discharge device, a dry distillation device, a heating device and a coke discharge device; materials are subjected to dry distillation by using a combined radiation heat exchange and convection heat exchange mode in the furnace; gas generated in a dry distillation process is used as a dry distillation heat source, and the dry distillation heat can be self-balanced; the materials are directly heated by virtue of radiation of a furnace wall of a combustion chamber, and a heat carrier does not need to be subjected to secondary heating and long-distance conveying; a dry distillation gas outputting device is arranged in the furnace, so that the gas in the furnace flows smoothly; coke is discharged by a dry method. The dry distillation furnace is high in heat utilization efficiency, low in outlet gas quantity, low in water consumption, high in oil yield and large in daily treatment capacity capable of being more than 6,000 tons, and is suitable for low and medium-temperature dry distillation of the materials such as oil sand, oil shale, coal and the like, and suitable for oil refining and dry distillation of large particle materials and small particle materials of less than 15mm.

A working vehicle includes a traveling machine assembly, a drive unit, a bonnet configured to cover the drive unit, and a cover provided below the bonnet and configured to be removably attached to the traveling machine assembly, including a main body portion extending in a longitudinal direction of the traveling machine assembly, a first male engagement portion provided at a front end portion of the main body portion, a second male engagement portion provided at a rear end portion of the main body portion, and a third male engagement portion provided at a lower end portion of the main body portion.

The invention relates to a branch control phase inversion heat exchange system and a branch control phase inversion heat exchange method based on a vapor-liquid heat exchanger. The system comprises a liquid storage tank (20), a heat source heat exchanger (3), a cold source heat exchanger (15) and a vapor-liquid heat exchanger (9); an upper collection tank of the heat source heat exchanger (3) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet steam pipe (8); a vapor-liquid heat exchanger outlet steam pipe (10) which is arranged on the vapor-liquid heat exchanger (9) is divided into two branches which are communicated with an upper collection tank and a lower collection tank of the cold source heat exchanger (15); the lower collection tank of the cold source heat exchanger (15) is communicated with the upper part of the liquid storage tank (20) through a cold source heat exchanger liquid outlet pipe (17); the bottom of the liquid storage tank (20) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet condensation liquid pipe (11); and the vapor-liquid heat exchanger (9) is communicated with a lower collection tank of the heat source heat exchanger (3) through a heat exchanger outlet condensation liquid pipe (6). The branch control phase inversion heat exchange system can solve the phenomena of overcooling and overheating and improve heat exchanging efficiency.

An engine blower includes a muffler (9) provided to an engine and a volute case (31) accommodating a fan driven by the engine. On a muffler main body (10) of the muffler (9), an exhaust-gas guide member (21) covering an exhaust-gas outlet port and a cover hood (22) covering the exhaust-gas guide member (21) on the side of the outlet port are provided. Between the exhaust-gas guide member (21) and the cover hood (22), an outside-air introduction gap (23) is formed, through which outside air is introduced into the cover hood (22) by ejector effects. A blow-off port (32) for blowing off a part of pressure air in the volute case (31) to the outside-air introduction port (23) is only provided at a position substantially on a back side of the outside-air introduction gap (23).

The invention relates to a system adopting a high concentration CO2 flue gas as a coal dust drying medium in a boiler and belongs to the technical field of energy technology application and CO2 capture. The flue gas which is dehydrated and heated to a certain temperature and contains over 95 percent of CO2 is used as the drying medium for coal dust pulverizing. The drying medium is an inert gas with low oxygen content so as to solve the problem of easy explosion of a coal pulverizing system when hot air is used as the drying medium and improve the operational safety of the coal pulverizing system. Meanwhile, compared with the temperature of the hot air, the initial temperature of the drying medium can be greatly improved so as to reduce the power consumption of a coal mill, improve the fineness of coal dust, improve combustion efficiency, reduce the exhaust gas temperature and improve the heat efficiency of the boiler.