60results about How to "Save primary energy" patented technology

A urban household garbage sorting and charring comprehensive treatment resource recovery method comprises the first step of garbage sorting treatment, wherein original household garbage is subjected to uniform feeding, manual large garbage sorting, coarse crushing, plate-frame pressure filtering, rolling cylinder screening, full-closed mechanical selecting by winnowing, plate-type magnetic separator treating, eddy current magnetic separator treating and fine crushing process treatment; the second step of garbage drying treatment; the third step of garbage charring treatment, wherein a rotary charring furnace is adopted, and garbage charring is carried out in a normal-pressure low-temperature and low-oxygen atmosphere so that solid carbon can be prepared; the fourth step of coke forming and cooling treatment; the fifth step of bad smell purifying treatment, wherein bad smell generated in a household garbage discharging warehouse and bad smell generated in all treatment process links are collected to a bad smell purifying system through a negative pressure induced draught system; and the sixth step of waste water purifying treatment. The urban household garbage sorting and charring comprehensive treatment resource recovery method is relatively high in automation degree, sorting efficiency and recovery utilization rate and has more sorting functions.

The invention discloses an MVR heat pump evaporation system, which comprises a water vapor compression system, an evaporator, a separator, an energy storage water tank and a waste heat recovery system. The vapor outlet of the energy storage water tank and the vapor outlet of the separator are both in connection with the vapor inlet of the water vapor compression system, the vapor outlet of which is connected to the vapor inlet of the evaporator. The vapor outlet of the evaporator is connected to the vapor inlet of the separator, and the stock solution inlet and the concentrated solution outlet of the evaporator are both in connection with the waste heat recovery system. The MVR heat pump evaporation system provided by the invention recovers low grade waste heat, i.e. makes use of the energy storage water tank to convert hot water sensible heat into low-pressure vapor latent heat for recycling during starting, thus enhancing the start-up speed of the system, avoiding the influence of non-condensable gas air circulation in the system on compressor performance, recovering all the latent heat of secondary vapor generated in a solution evaporation process, saving primary energy, greatly reducing the energy consumption during solution evaporation, and avoiding pollution.

The invention discloses a method for preparing powder active carbon by taking cow dung as a raw material. The method is as follows: by taking the cow dung as the raw material, carrying out activation for 24 hours by a composite activator formed by mixing phosphoric acid and phosphate, and then carbonizing at a high temperature. According to the invention, livestock breeding waste-cow dung is mainly utilized as the raw material, and is sufficient in source, easy to purchase and low in price; the composite activator is relatively low in price and can be recycled in different degrees; the method for using the activator to activate the cow dung and then carbonizing radically solves influences and damage of the cow dung on environment; the prepared active carbon can be directly and practically applied to satisfy various needs on active carbon, so that waste is changed into things of value, and therefore, the method has remarkable social and economic benefits, and very good commercial application prospect.

The invention discloses an elevated uniform automatic road which comprises a roadbed, a track and an elevated uniform automatic road surface, the roadbed is in a shape of the athletics field runway, the track is arranged on the roadbed in a shape of circular close structure, the elevated uniform automatic road surface is composed of a plurality of panels orderly connected from the front part to the rear part and has the same close structure with the track, a power driving wheel rolling along the track is arranged below each panel; the elevated uniform automatic road surface is driven by the power driving wheel for executing uniform automatic operation. The elevated uniform automatic road is more convenient and faster compared with the driving by oneself, the travel cost is greatly reduced for people, most people has no need to drive a car in the city, the vehicle number on the city road is greatly reduced, the unrenewable and one-off resource as the petroleum and the natural gas can be greatly saved and elevated uniform automatic road is extremely beneficial to the ecological environment and sustainable development. The elevated uniform automatic road has good practicability and higher popularization and application value, the running cost is low, the energy is saved and the consumption is reduced and the elevated uniform automatic road is worth for promoting application.

The invention discloses a process for generating combustible gas by virtue of sludge gasification. The process comprises the following steps: 1, dewatering sludge; 2, granulating the dewatered sludge, airing and drying; 3, feeding dried sludge granules into an integrated sealed pyrolysis gasification device, and gradually drying, drily distilling, carbonizing, gasifying and combusting the sludge granules from top to bottom in the integrated sealed pyrolysis gasification device; and finally discharging gas generated in the device through a pipeline, collecting the gas, combusting organic matter residues and inorganic matters at high temperature to obtain harmless molten slag, and discharging the molten slag through a slag outlet. According to the process, 200 tons of sludge with the water content of less than 60% can be treated by a monomer gasification device each day; the reduction, the harmlessness and the energization of the sludge treatment are realized; the dioxin generation conditions are avoided; the operating cost is low, namely a large quantity of manpower cost can be reduced due to automated operation and management; 1 ton of sludge with the water content of less than 30% can be averagely gasified to generate 1600Nm<3> of combustible gas.

The invention discloses a variable volume type energy-saving refrigerator. The energy-saving refrigerator consists of a separating room and a storage room, wherein the separating room is separated from the storage room by a movable separating plate, the ground of the energy-saving refrigerator is provided with ground guide rails, and a wall body of the energy-saving refrigerator is provided with wall body guide rails; the wall body guide rails are internally provided with driving belts, and two ends of the driving belts are connected with wall body guide rail pulleys; two sides of the top end of the movable separating plate are provided with movable separating plate pulleys, and the movable separating plate pulleys are connected with the driving belts in the wall body guide rails; ground guide rail rolling wheels which are located in the ground guide rails are arranged under the movable separating plate; the center of the movable separating plate is provided with a ratchet wheel, the periphery of the movable separating plate is uniformly provided with four crank connecting rods, the crank connecting rods are connected with the ratchet wheel, cranks are in contact with heat preservation strip plates which are arranged at the periphery of the movable separating plate, and the cranks are driven by the crank connecting rods to generate compressed stress on the heat preservation strip plates when the ratchet wheel moves. According to the technical scheme discloses by the invention, the consumed cooling amount of the energy-saving refrigerator can be changed along with the food storage amount, the energy consumption of the energy-saving refrigerator can be effectively reduced, and an energy-saving purpose can be achieved.

The invention relates to a preparation method of eggplant stalk activated carbon, comprising the following steps of: cleaning, drying and crushing eggplant stalks, carbonizing for 30-40 minutes at the temperature of 450-650 DEG C, activating for 80-100 minutes at the temperature of 650-700 DEG C with an activating agent, cooling to room temperature, and then taking out the eggplant stalks; then soaking the activated eggplant stalks into hydrochloric acid, stirring for 1-2 hours at the temperature of 55-65 DEG C, washing to be neutral with distilled water, drying, and screening to the size of 200 meshes, so that powdery eggplant stalk activated carbon is obtained, wherein the weight ratio of the activating agent to the eggplant stalks is (2-4): 1. The prepared method provided by the invention is simple and effective, raw materials are widely available, cost is low, corrosivity is low, pollution to the environment is less, iodine adsorption value and methylene blue adsorption value of the eggplant stalk activated carbon are far higher than the standard values of the national wood water purification primary activated carbon, and a new raw material is developed for manufacturing of the activated carbon.

The invention discloses a fuel oil additive, which comprises the following steps: mixing burning-rate accelerator, dissolvent, booster and balancing agent; stirring at normal temperature evenly; choosing one of acid oil, fatty acid and oleinic acid as burning-rate accelerator; choosing methyl alcohol or alcohol as dissolvent; choosing aminoethyl alcohol as balancing agent; choosing cetane number as booster; setting the mass percent of burning-rate accelerator, dissolvent, balancing agent and booster as 65-70%, 25-30%,4-6% and 0.4-0.5%; getting the product. This additive can be added into diesel and heavy oil and can decrease about 40% emission of CO2 and SO2, which can protect environment with low cost.

The invention relates to an additional-energy energy-saving boiler system and an energy-saving method, which belongs to the field of energy-saving and efficiency-increasing technology of boiler. According to ejecting principle, a portion of feed water can absorb heat of an environment heat source or other waste heat at low temperature and under low pressure, and the method can improve the boil efficiency by using the phase-change energy desired for vaporizing a portion of feed water from liquid state to gas state. The system comprises a boiler (1), a steam generator (2), a water separator (3), a gas-distributing cylinder (4), a heat exchanger (5), a heat source (6), a primary ejector (7), a secondary ejector (8), a tertiary ejector (9) and a valve (10). The method and the system can improve the heat efficiency of the boiler to achieve energy conservation and emission reduction.

An inner pipe, a seal body, an outer pipe, a flange and a seal valve are respectively connected integrally to form a maintenance-free vacuum heat-insulation fluid heat energy delivery pipe. The maintenance-free vacuum heat-insulation fluid heat energy delivery pipe is applied to a biomass renewable energy source environment-friendly low-carbon urban electricity generating and heat supply device or applied to traditional coal, petroleum, natural gas electricity generating and heat supply engineering. The heat supply efficiency is improved, heat loss is reduced, fuel is saved, carbon emission is reduced, and the electricity generating and heat supply cost is reduced. The heat energy loss of the pipe is reduced from 10%-30% to 1% per 10-kilometer delivery distance compared with heat energy loss of a same-class heat-insulation delivery pipe.

A water-source heat pump heating device used for oil field wellhead includes wellhead medium transmission tube, heat exchange medium output tube for connecting gathering station, water-source heat interchanger connected to water-source heat pump group, pumping submersible pump and recharge water tube which are assembled in well tube of heat collector well. The technical points includes that: the wellhead medium transmission tube and the heat exchange medium output tube connected to the gathering station are respectively connected to heat exchange medium inlet end and outlet end of the medium heater, and high temperature cycle pipeline of the heat pump group is connected to heating pipe in the medium heater, double-channel non-plug impeller comprised by main, vice impellers and automatic control powerful pollution discharge pump of fixed stirrer assembled at terminal end of motor shaft are arranged at bottom of the recharge water level in well tube of the heat collection well, outlet end of the pump is connected to sedimentation pond outside the well tube. The invention has reasonable design, easy operation, and can save primary energy and improve stability and safety of the oil well.

The invention discloses an optimal allocation method for positive and negative spinning reserve capacity among thermal power units in a system comprising a wind farm. According to the method, a spinning reserve capacity benefit model is constructed by taking the running economy and reliability of the system into account, namely, the cost of positive spinning reserve capacity, power generation benefits of negative spinning reserve capacity, obvious reduction of the situation that electric quantity is lower than an expected value after the spinning reserve capacity configuration of the system, an equivalent power function is used for describing the output of the thermal power units and wind turbine generators, and the allocation of the spinning reserve capacity among the thermal power units which are put into operation is optimized by virtue of a probabilistic production simulation calculation method. The method has certain reasonability, and a feasible reference is provided for the large-scale reliable grid-connected running of the wind turbine generators.

The invention relates to a method for preheating inflow water of a membrane method seawater softening device, belonging to the technical filed of oilfield development and seawater desalination. The method comprises the following steps of: firstly, exchanging the heat between low-temperature seawater and produced water or drained strong brine of the membrane method seawater softening device in a primary heat exchanger, recovering the waste heat of the drained strong brine, exchanging the heat between the seawater undergoing primary preheating and produced water with crude oil separated in a secondary heat exchanger, continuing to increase the temperature of the seawater, leading the seawater undergoing two stages of preheating into the membrane method seawater softening device, and separating the seawater to obtain the product water; and collecting the drained strong brine of the membrane method seawater softening device, returning the drained strong brine back to the primary heat exchanger to preheat low-temperature inlet seawater, leading the strong brine into a strong brine drainage pipeline after releasing heat and cooling down, and leading the oilfield produced water into a produced water reinjection pump station pipeline after releasing heat and cooling down so as to realize the two-stage preheating of inflow water of the membrane method seawater softening device. The method has the advantages of simple principle, convenience for operation, reliable running, energy saving, environment friendliness and practical value.

The invention discloses an MVR evaporation system for radioactive waste liquid in a nuclear power station. The MVR evaporation system comprises a preheater, an evaporation tower, a circulating pump, aheater, a steam compressor, an electric heating device and a distillation tank, wherein the heater is located out of the evaporation tower; an inlet and an outlet in one side of the heater are communicated with the evaporation tower; the evaporation tower is communicated with the steam compressor; an outlet of the steam compressor is communicated with an inlet in the other side of the heater; anoutlet in the other side of the heater is communicated with the distillation tank; and two ends of the electric heating device are respectively connected with the other-side inlets of the distillationtank and the heater. An operation method based on the evaporation system comprises the following steps: step a, starting a liquid inlet pump, and adding to-be-treated feed liquid to the evaporation tower until a specified liquid level is reached; step b, starting the circulating pump, the electric heating device and a distillation pump; step c, starting the steam compressor and a liquid sprayingpump; and step d, turning off the electric heating device and the distillation pump. According to the invention, radioactive waste liquid of the nuclear power station is efficiently treated, radioactive pollution is reduced, and latent heat of secondary steam generated by the waste liquid is recycled.

The invention discloses an energy-saving optimization method for new energy and thermal power bidirectionally supplying power for high energy carrying loads. The method comprises the steps of building a model to carry out ultra-short period power prediction on wind electric power data in a future preset time slot, adopting an existing load prediction mathematical model to carrying out ultra-short period power prediction on high energy carrying load data in the future preset time slot, judging whether wind electric power meets the demands of normal production operation of high energy carrying loads in the future preset time slot or not, adopting wind electricity to supply power for the high energy carrying loads directly if the wind electric power meets the demands of the normal production operation of the high energy carrying loads in the future preset time slot, and building an energy-saving optimization model of supplying power for the high energy carrying loads through the new energy and the thermal power bidirectionally if the wind electric power cannot meet the demands of the normal production operation of the high energy carrying loads in the future preset time slot. The energy-saving optimization method for the new energy and the thermal power bidirectionally supplying power for the high energy carrying loads has the advantages of being high in reliability and energy utilization rate, and good in energy-saving effect.

The invention relates to a condensation and reheating integration type smoke plume white-eliminating system. The system comprises a denitration device, a flue gas waste heat utilization device, an electrostatic precipitator, a wet desulphurization device, an induced draft fan, a tail flue gas heater and a chimney which are connected in series in order, wherein the flue gas waste heat utilization device is used for recovering flue gas waste heat, and the tail flue gas heater is used for raising flue gas temperature. Compared with the prior art, the system utilizes the flue gas waste heat to heat condensed water, recovers the flue gas waste heat, and reduces the salt content; the tail flue gas heater utilizes a steam turbine to extract air so as to heat flue gas and raise the flue gas temperature; at the moment, the salt content of the steam of flue gas is not high, the steam temperature is raised, and the density declines; and thus, the flue gas is beneficially diffused to higher heightafter being discharged into the atmosphere, the local concentration of the flue gas discharged into the atmosphere is reduced, and the impact of flue gas containing smoke on the environment is reduced.

The invention relates to the field of dry recycle systems, and concretely relates to an MVR heat pump sludge drying system. The MVR heat pump sludge drying system comprises a hollow blade type drying machine and a vapor compressor; wet sludge is dried by the hollow blade type drying machine to generate secondary vapor, and the secondary vapor enters the vapor compressor and is compressed to become recompressed vapor; and the recompressed vapor flows back into the hollow blade type drying machine. All latent heat of the secondary vapor generated in the sludge drying process can be recovered by the MVR heat pump sludge drying system, and can be used as a sludge recompression vapor heat source, so energy is saved, and energy consumed for the sludge drying is substantially reduced, and the pollution is avoided; and the system has the advantages of stable running, reduction of the energy loss in the operation, and increase of the work efficiency.

The invention relates to a municipal wastewater and municipal ground source cooperation type heat exchange system. According to the municipal wastewater and municipal ground source cooperation type heat exchange system, two-way use of heat energy of municipal wastewater and heat energy of a ground source can be realized, and surplus heat energy of the wastewater can be stored in soil. A novel sustainable energy supply system is realized through interaction of the heat energy of the wastewater and the heat energy of the ground source. The novel wastewater heat exchange system comprises a heat exchanger, a heat supply system, a heat supply loop, a heat user, wastewater pipelines and a blow-down tank. The service life of the municipal wastewater heat exchange system is greatly prolonged, the installation procedure is simplified, the energy utilization rate is increased, municipal carbon dioxide emission is reduced, and municipal water resources are protected. The light-weight wastewater heat exchange system saves energy, reduces emission and is free of pollution.

The invention provides a piston-type high-temperature heat pump device for waste heat recovery, and belongs to the technical field of heat pumps. The device is composed of a high-temperature heat pump unit, a high-temperature hot water loop and a low-temperature cold water loop. By the adoption of a two-stage compression and two-stage throttling piston-type refrigerating cycle, the compression ratio of the unit is reduced, the working conditions of the unit are improved under a high-temperature working mode, the efficiency of the unit is improved, and large-span temperature rise is achieved. Compared with the prior art, a high-temperature heat pump is adopted for replacing a boiler for heat supply, primary energy is saved, energy consumption is reduced, and the benefit of environmental protection is remarkable. Simultaneous heat and cold supply is adopted for the high-temperature heat pump device, so that equipment energy consumption in industrial production is further reduced, and the energy-saving effect is remarkable. Two-stage compression and two-stage throttling is adopted for a heat pump cycle system, so that the compression ratio is reduced, the working efficiency is improved, the working environment of the unit is improved under the high-temperature working mode, and the service life of the unit is prolonged.

The invention discloses a solar energy powered indoor air exchange device. The air exchange device comprises a photovoltaic module, a direct current (DC) / DC unit, a storage battery drive circuit, an air exchange fan, an oxygen concentration detection unit and a controller; the photovoltaic module is connected with the DC / DC unit; an output interface of the DC / DC unit is connected with an input interface of the drive circuit; an output interface of the drive circuit is connected with the air exchange fan; a storage battery is connected in parallel between the DC / DC unit and the drive circuit; the oxygen concentration detection unit is connected with the controller; and the controller is connected with the DC / DC unit, the storage battery and the drive circuit respectively. The solar energy powered indoor air exchange device can ensure effective ventilation when the oxygen concentration in a room is too low and guarantee the health of a human body, and also can prevent energy waste and the wearing of the air exchange fan.

The invention discloses a summer and winter cold and hot water supply method for a cultivation farm. In winter, firstly, acquired seawater and fresh water pumped from a fresh water well are mixed into mixed water; and secondly, after heat exchange, mixed water flows into condensers of two single-screw water source heat pump units in parallel and is turned into cultivation hot water after absorbing heat, after waste water formed by high-temperature water after heat exchange is mixed with fresh water pumped from the fresh water well, mixture of the waste water and the fresh water flows into a heat exchanger to indirectly exchange heat with water on evaporator sides of the two heat pump units, and circulating water in independent water systems of the evaporator sides flows into evaporators of the heat pump units in parallel after heat exchange to discharge heat. In summer, acquired seawater is mixed with fresh water pumped from the fresh water well, and then flows into the evaporators of the two heat pump units in parallel, and required cultivation cold water can be obtained after mixture of the seawater and the fresh water realizes heat discharge and is cooled; and a second channel of seawater directly flows into the condensers of the two heat pump units in parallel after being pressurized by a cooling water circulating water pump, and is drained after heat is absorbed. The method is efficient and energy-saving and is low in running expense.

The invention discloses a heat pump system of a sewage source. The heat pump system consists of a water source heat pump unit, an air-conditioning system and an outdoor sewage source system, wherein the outdoor sewage source system comprises a sewage pool, a plurality of groups of heat-exchange drain pipes, two sewage taking wells, two sewage feed pumps and two sewage drain pumps. Urban raw sewage serves as a cold and heat source of the heat pump system, can be up to the water temperature of about 12 DEG C in winter and is not high in water temperature in summer, so that the urban sewage is the very ideal cold and heat source of the water source heat pump unit, primary energy can be greatly saved, the exhaustion of harmful air can also be reduced, the operation cost is low, and the economic benefic is obvious.

The invention discloses a method for preparing a titanium dioxide / active carbon electrode material from waste cotton textiles. A KOH chemical activation method is adopted, active carbon is prepared through a tube type resistance furnace at the nitrogen atmosphere in a high-temperature carbonization and activation manner, and a titanium dioxide loaded active carbon electrode material is prepared through a sol-gel method and a calcination method. The method is implemented specially according to the following steps that firstly, raw materials are pretreated; secondly, carbonization materials are prepared; thirdly, the active carbon is prepared; and fourthly, the TiO2 / active carbon electrode material is prepared. By means of the method, the high-performance active carbon with high specific area is obtained, the electrode material prepared from the active carbon loaded with titanium dioxide has excellent electrochemical performance, and efficient recycling of the waste cotton textiles is achieved.

A synthetic fuel gas for stove is prepared from alcohol as primary component and gasoline as secondary one through evaporating them respectively and proportional mixing. Its apparatus is a novel gas stove which is composed of primary alcohol evaporating tank, secondary alcohol tank, heater, primary gasoline gasifying tank, secondary gasoline tank, circulating pump, stove and automatic controller for controlling the proportion and pressure of fuel gas. Its advantages are low cost, and high environmental protection effect.

The invention relates to the field of water pollution treatment, and discloses an in-situ treatment and purification device for polluted water, which includes a floating platform of a device frame, a platform support, and a water grid cylinder. The bottom is provided with a porous sieve plate, the bottom of the isolation outer cylinder is connected with the water inlet grid cylinder, and the isolation outer cylinder is filled with suspended fillers. A water flow lifting device into the water. The present invention can adopt single cylinder or double cylinder structure. And can utilize wind power or solar energy or both to convert into electric energy function, also can directly adopt wind power.

The invention relates to a lithium-bromide deep terrestrial heat driving device. Existing electric energy and fuel are replaced by fully utilizing natural energy, a large quantity of primary energy and secondary energy are saved, reasonable and effective utilization of terrestrial heat energy is achieved, and heat efficiency is high. The lithium-bromide deep terrestrial heat driving device comprises an evaporator which is connected with an absorber, a generator and a condenser in sequence to form a closed loop, and a solution pump is arranged between the absorber and the generator.

A fuel gas weak blast wave ash-cleaning duster, comprises a box body (6), a filter element (62) and a spraying and blowing device (61). A weak blast wave reactor (1) is disposed on the top or lateral part of the box body (6). The weak blast wave reactor (1) is connected with the spraying and blowing device (61) on the box body (6). An air inlet pipe is disposed on the weak blast wave reactor (1). An igniting device (2) is disposed on the weak blast wave reactor (1). The weak blast wave reactor (1) is connected with a fuel gas conduit (4) equipped with a pressure-reducing valve (4a), a speed control valve (4b) and a fuel gas solenoid valve (4c). Both the igniting device (2) and the fuel gas solenoid valve (4c) are connected with a control box (5).

A water treatment system (100) for a recirculation aquaculture facility, related method and uses thereof are provided. The water treatment system (100) comprises a water pre-treatment facility (120) and a groundwater recharge arrangement (130), wherein said water treatment system forms a primary recirculation flow pathway (111) when integrated with the recirculation aquaculture facility (140), thereupon effluent (111B) discharged from the recirculation aquaculture facility is sequentially directed through (120) and (130) back into the recirculation aquaculture facility via a water collecting circuit network (151) to enter the recirculation aquaculture facility as an influent (111A). The secondary recirculation flow pathway (141) is formed internally within the recirculation aquaculture facility.

The invention discloses an energy-saving industrial energy station utilizing waste heat recovery and clean energy. The energy-saving industrial energy station comprises a sewage source heat pump system, an auxiliary system, an energy storage system and a solar auxiliary heating system. The invention further discloses an operation control method of the energy-saving industrial energy station. The energy storage water tank is used for providing energy (cold energy is provided in summer and heat energy is provided in winter) for an air conditioner user, on one hand, the influence of load fluctuation of the air conditioner user on heat pump units (a sewage source heat pump unit and an air cooling source heat pump unit) can be reduced, and the heat pump units are always in an efficient working interval; and on the other hand, the heat pump unit can utilize off-peak electricity to refrigerate or heat and store the off-peak electricity in the energy storage water tank, so that the electricity utilization cost is reduced.

The invention discloses photovoltaic vehicle Chinese handwriting search player with a USB port and a movable cover and relates to a vehicle Chinese handwriting search liquid crystal player with a USB port. The player comprises a Chinese handwriting search system, the USB port, a liquid crystal player and a power supply plug, and is characterized in that: the Chinese handwriting search system is connected with a power supply circuit electrically; the USB port is electrically connected with the liquid crystal player and a power supply plug circuit; a photovoltaic cell component is connected with a power supply plug and the liquid crystal player; the liquid crystal player is mechanically connected with a universal adjustment device; the liquid crystal player is connected with a self-tightening hinge, the a cover board and a self-tapping screw machine mechanically; and a cover board is connected with the photovoltaic cell component mechanically. The player allows a vice driver to see liquid crystal images clearly when arranged on an instrument board in front of the vice driver. Electricity generated by a photovoltaic device is supplied to the liquid crystal player. Therefore, non-renewable energy resources are saved. Electricity of a storage battery in the vehicle is not used and the service life of the storage battery is prolonged.