6results about How to "Reduce heat consumption" patented technology

The invention provides a resonant converter parameter optimization method and system of an electric vertical take-off and landing aircraft, and relates to the technical field of aviation power electronics. The method comprises the following steps: constructing an improved equivalent circuit model containing transformer secondary side leakage inductance; deriving a voltage gain function expression of the improved equivalent circuit model and an optimization calculation formula of the excitation inductance required for realizing the soft switching; parameter optimization is carried out based on the voltage gain function expression and the excitation inductance optimization calculation formula; and building an LLC resonant converter experimental prototype according to the optimized parameters, and carrying out system verification and performance evaluation. According to the invention, the problem of performance reduction caused by neglecting secondary side leakage inductance under a high-frequency working condition in a traditional design is solved, the efficiency, the voltage stabilization precision and the power density of the converter are remarkably improved, and the high requirement of eVTOL on an airborne power supply is met.

The application belongs to the field of cellulose ethers, and embodiments provide a sodium carboxymethyl cellulose and a preparation method and a dust suppressant thereof. The method comprises the following steps: mixing cellulose, a solid base and a solid etherifying agent to obtain a first mixture; adjusting the humidity of the first mixture by using a humidity adjusting medium to obtain a flowable wet powder body; mechanically activating the wet powder body to obtain a second mixture; performing a heating treatment on the second mixture to cause the second mixture to undergo an alkalization reaction and an etherification reaction; performing a neutralization treatment on the obtained heating treatment product to obtain a neutral mixture; and sequentially performing a dissolution treatment and a purification treatment on the neutral mixture to obtain the sodium carboxymethyl cellulose. The method of the embodiments of the application does not require a large amount of organic solvents such as isopropyl alcohol, thereby reducing the generation of waste liquid and significantly reducing the environmental disposal cost and production safety risk.

The invention relates to the technical field of phased array radar power supply and distribution, in particular to an intelligent multi-stage slow start device applied to a radar power supply and distribution system, and the intelligent multi-stage slow start device is connected between an input terminal and an output terminal of the radar power supply and distribution system. The intelligent multi-stage slow start device comprises a main loop module, a state acquisition module and a decision control module, the main loop module is composed of a main relay and n slow start branches which are connected in parallel. Each slow start branch is composed of a branch relay and a current-limiting resistor which are connected in series. The state acquisition module is composed of a voltage acquisition unit used for acquiring output voltage in real time and a temperature acquisition unit used for acquiring the temperature of each current-limiting resistor in real time. The decision control module is composed of a central processing unit, a voltage reference adjusting unit, a comparison unit and a driving unit, and is used for controlling the on-off of the branch relays of the n slow start branches. According to the device, low-cost, low-heat-consumption and high-reliability slow start is realized, and higher-level system protection is provided.

This invention discloses an energy-saving multi-effect evaporation system and process based on absorption refrigeration and heat pump in the field of multi-effect evaporation technology. The system includes: a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a steam condenser, a primary feed pump, and a secondary feed pump. The multi-effect evaporation system also includes a refrigeration unit, a high-pressure evaporator, and a high-pressure absorber. This application recovers waste heat from the multi-effect evaporation process using absorption refrigeration and heat pump technology to generate circulating steam of the same grade as the source steam. This serves as a supplement to the source steam during the evaporation process, reducing both the consumption of source steam and the energy consumption of the cooling tower for cooling medium-temperature water.

The application discloses a heat work driving type refrigeration system with heat and mechanical compression in parallel and multiple heat recovery and a method thereof; an evaporator is sequentially connected with a first-stage compressor and a heat recovery device; the heat recovery device is connected with a gas-liquid separator and an absorber; the gas-liquid separator is connected with a second-stage compressor, the heat recovery device and a condenser; the condenser is connected with a first throttling valve and the gas-liquid separator; the condenser is connected with the gas-liquid separator, a second throttling valve and the evaporator; the absorber is connected with a solution pump, a heat recovery cycle side of the heat recovery device and a generator; one side of the generator is sequentially connected with a third throttling valve of the heat recovery cycle side of the heat recovery device and the absorber, and the other side of the generator is connected with the heat recovery device and the condenser. In the system, the heat and mechanical compressors have parallel connection characteristics at a high-pressure stage, and are connected in series at a low-pressure stage, and the exhaust heat of three compression processes is compactly recovered and utilized in heat compression through a multiple flow heat recovery device, so that the heat consumption is significantly reduced and the matching of the system with a small and medium-sized heat source is improved.

The invention discloses an out-of-kiln pre-decomposition system for sintering alumina clinker and an application method.The out-of-kiln pre-decomposition system comprises a smoke chamber, a decomposition furnace, a cyclone cooler, a multi-stage cyclone preheater and a fan which are sequentially connected through pipelines, and the multi-stage cyclone preheater is further connected with the decomposition furnace through a pipeline; the cyclone cooler is further connected with the smoke chamber through a pipeline, and the fan is further connected with the cyclone cooler and the outside through pipelines. The multi-stage cyclone preheater and the decomposing furnace are utilized to complete complete pre-decomposition of the raw materials, low-temperature flue gas is utilized to reduce the temperature of the materials discharged from the decomposing furnace, and the problem that the high-temperature materials crust in the preheater and a smoke chamber is solved. The process is simple, the system is stable and reliable, the pre-decomposition outside the kiln of the raw materials can be fully completed, and good economic benefits and social benefits are achieved.