31results about How to "Improve the efficiency of waste heat recovery and utilization" patented technology

A method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide, the method is: mixing carbon dioxide and water vapor; the mixed gas is sprayed into a fluidized bed heat exchanger through an injection system, and enters a gas circulation pipeline through a waste heat boiler; Part of the gas is returned to the gas injection system, and the rest is passed into the air distribution plate; the molten metallurgical steel slag is introduced into the fluidized bed heat exchanger for gas quenching, and the generated steel slag particles are suspended under the action of the air flow; the high-temperature gas enters the waste heat boiler for heat exchange to form low-temperature gas Enter the gas circulation pipeline; when the steel slag particles are below 800°C, an exothermic reaction occurs; when the temperature of the high-temperature gas is 450±5°C, supplement CO 2 ; When the material temperature is below 150°C, close the gas injection system; the device includes a steel slag chute, a fluidized bed heat exchanger and a gas injection system. The method of the invention has high utilization efficiency of steel slag waste heat recovery, good steel slag stability, small occupied area, short treatment cycle and low gas consumption.

The invention provides a waste heat comprehensive utilization power generation system for a sintering production line, which is characterized in that: a blanking port hood is arranged between a discharge port of a sintering machine and a feed port of a cooling machine, and an evaporator D is arranged in the blanking port hood; a hood A and a hood B are arranged at the feed port of the cooling machine, and the hood A is communicated with a heat exchanger A; the hood B is communicated with a heat exchanger B, and a hood C is arranged at the discharge port of the sintering machine; the hood C iscommunicated with a heat exchanger C, and water in a waste heat boiler continuously flows into an evaporator A, an evaporator B, an evaporator C and the evaporator D to be heated into hot water; and hot steam drives a generator through a steam turbine to generate power. The waste heat comprehensive utilization power generation system reasonably utilizes the waste heat resources of the whole sintering production line and the heat of a lot of flue gas generated when a sintering ore is cooled by the cooling machine, thereby greatly improving the waste heat recovery utilization efficiency of the sintering process, and increasing generating capacity.

The invention aims at providing a ship low-speed diesel engine waste heat comprehensive recycling system control method based on the rotation speed. An exhaust pipe of a ship low-speed diesel engine is connected with a power turbine and a turbine of a turbocharger. The turbine of the turbocharger is connected with a waste heat boiler, and the waste heat boiler is connected with a steam turbine and an organic working medium steam turbine. The power turbine, the organic working medium steam turbine and the steam turbine are connected with a power generator. The turbocharger is further connected with a bypass channel. A startup or shutdown control signal is output to a waste heat boiler control device, an organic working medium power generation unit control device, a steam turbine power generation unit control device and a power turbine power generation unit control device according to the rotation speed of the ship low-speed diesel engine so that control over startup and shutdown of the corresponding devices can be achieved. By adoption of the section control mode, different utilization measures can be adopted according to exhaust gas parameters generated when the diesel engine runs at different rotation speed sections, and the waste heat recycling efficiency is improved.

The invention discloses a waste heat cascade recovery and utilization device and a working method. The device includes: an absorption heat pump system and a thermal power conversion system. The device is coupled with absorption heat pump and heat engine technology, driven by waste heat working fluid, which flows through the heater, high-pressure generator, low-pressure generator and waste heat recovery device in sequence, and the high-temperature and high-pressure steam generated by the high-pressure generator of the device is superheated The turbine expands and outputs mechanical power to generate electricity. The exhaust steam discharged from the turbine and the low-pressure generator produce high-temperature and high-pressure water vapor, which enters the condenser to condense and release heat for heating in winter. The evaporative generator generates cold energy for cooling. , to achieve the effect of cogeneration of heat and power in winter and cogeneration of cooling and power in summer. The device fully recovers the waste heat energy of the working medium in the way of waste heat cascade recycling, making the most economical use of waste heat and energy. While improving the energy utilization rate, it effectively reduces atmospheric heat pollution. It has energy saving and emission reduction, economical operation and wide application range. many advantages.

The invention provides a cement kiln waste heat comprehensive utilization power generation system which comprises a rotary cement kiln, a grate cooler, an AQC (air quenching cooler) waste heat boiler, an SP waste heat boiler, a steam turbine and a power generator, wherein the AQC waste heat boiler comprises a first heat exchanger, a second heat exchanger and a first boiler barrel, the first heat exchanger is internally provided with a first economizer, the second heat exchanger is internally provided with a second economizer and a first evaporator; the SP waste heat boiler comprises a third heat exchanger and a second boiler barrel, the third heat exchanger is internally provided with a second evaporator; water in the first economizer is heated and then flows into the second economizer and continuously flows to a water supply collection tank and respectively flows into the first boiler barrel and the second boiler barrel; and water in the first boiler barrel is heated circularly in the first evaporator, water in the second boiler barrel is circularly heated in the second evaporator, and heat steam is collected to a steam collection tank, and enters into a fourth evaporator for being continuously heated, and finally enters into the steam turbine to drive the power generator to generate electricity. According to the invention, the recycling efficiency of waste heat of the cement kiln is increased and electric energy production is increased.

The invention provides a cement kiln waste-heat utilization system and a method for directly driving rotating equipment by a turbine. The system and the method belong to the technical field of cement kiln waste-heat utilization. The waste-heat utilization system comprises a waste-heat recovery device, a high-temperature fan turbine drive device, a kiln tail exhaust fan turbine drive device, a cement grinding mill turbine drive device and a circulating cooling water device. According to the system and the method, superheated steam generated by the cement kiln waste heat is utilized to directly drive rotating equipment such as a high-temperature fan, a kiln tail exhaust fan and a cement grinding mill, the energy loss during the multistep energy transformation process from heat energy to electric energy to kinetic energy of waste heat power generation is avoided, and the cement kiln waste heat recovery and utilization efficiency is effectively improved.

The invention discloses a system and method for power generating by jointly recovering the waste heat of a flue gas of a sintering machine and an exhaust gas of a cooling machine, belonging to the technical field of power generation by using waste sintering heat of a steel and iron plant. The power generating system comprises a sintering machine flue gas waste heat utilizing system, a cooling machine exhaust gas waste heat utilizing system, a turbine generating system and a relevant auxiliary system, wherein a main waste heat discharging boiler is utilized to recover the waste heat of the flue gas of a high-temperature segment of the tail part of the sintering machine; a cooling machine waste heat boiler is utilized to recover the waste heat of the high-temperature exhaust gas of the cooling machine; and a high-temperature electric butterfly valve is arranged between the high-temperature segment and a low-temperature segment of a large flue positioned on the tail part of the sinteringmachine to prevent the wind pickup temperature of the flue gas from being reduced because a low-temperature flue gas and a high-temperature flue gas are directly mixed so as to ensure the high-temperature flue gas to enter the main waste heat discharging boiler for waste heat recovery. The system and method effectively utilizes the waste heat resources of the high-temperature flue gas of the machine tail of the sintering machine and a hot gas of the high-temperature segment of the cooling machine, enhances the waste heat recovery and utilization efficiency of a sintering process and increasesthe power generation capacity of the waste heat power generating system.