144results about How to "Reduce plant power consumption" patented technology

The invention relates to a storage-type super-low nitric oxide system in a coal fired boiler coal mill. On the basis of the existing low-nitrogen burning technology, the superfine coal powder preparation technology and the smoke circulating technology are adopted. The smoke circulating technology adopts cold furnace smoke to be mixed with primary air to be supercharged by a primary fan, the heating and powder feeding technology of an air preheater and the hot air and high-temperature furnace smoke drying technology of the powder production system are adopted, i.e. superfine coal powder can be prepared, the hot furnace smoke enters a primary air large air bellow, the hot furnace smoke is mixed with superfine coal powder prepared by a superfine coal powder preparation device in a coal powder blender and supplied by a powder supply machine from a coal powder cabin to be heated, and the air-powder mixture is fed into a low-nitrogen burner through a primary air pipe. In the main burning area of the boiler, since the air content of the furnace smoke is little, a lower residual air coefficient can be realized, the emission of the nitric oxide can be reduced.

The invention discloses an automatic control SCR flue gas denitrification urea pyrolysis system. The system is characterized in that a gas-gas heat exchanger is arranged in an inlet flue of an electric precipitator so as to form an air heating unit; a set of flue gas heating tube bundles are arranged in a boiler, so as to form an air reheating unit; after heated by the gas-gas heat exchanger and reheated by the flue gas heating tube bundles, air becomes high-temperature air at the temperature of heat resource required by urea pyrolysis; the high-temperature air is fed into a urea pyrolysis furnace and is mixed with a sprayed atomized urea solution, and then the pyrolysis is performed and an ammonia/air mixture is generated; the ammonia/air mixture is sprayed into an inlet flue of an SCR denitrification reactor through an AIG ammonia injection grating. The automatic control SCR flue gas denitrification urea pyrolysis system has the advantages that the technical structure is simple; the system can be widely applied to an SCR denitrification device of a coal-fired power plant; the urea atomizing pyrolysis efficiency can be effectively increased and the crystal plugging problem can be thoroughly solved; the waste-heat utilization of flue gas can be realized and the electrostatic precipitation efficiency can be increased; water used by a desulfurization system can be reduced.

The invention discloses a seal structure between a wind chamber and the lower part of a sintering ring cold machine trolley of a steel and iron plant, which mainly comprises an outer seal piece, a seal contact plate and inner-side seal rubber, wherein the outer seal piece consists of a seal piece strut member, an outer limit plate, an inner limit plate, an elastic rubber cylinder, rubber in the shape of a seal groove, a support plate and an adjustable connection screw rod, the support plate is arranged in the rubber in the shape of a seal groove and is connected with the seal piece strut member through the adjustable connection screw rod in an adjustable way, outer seal is realized through the rubber in the shape of a seal groove and the seal contact plate, and inner seal is realized through the inner-side seal rubber. The invention improves the efficiency of smoke recycle and the quality of smoke utilization, fully recycles smoke, effeciently uses cold residual heat of sintering rings, decreases maintenance cost of the seal piece and shortens service life.

The invention discloses a condensate pump frequency conversion control method and device, which are applied to a condensate pump frequency conversion control system. The system comprises a condensate pump frequency converter, a motor, a condensate pump and a deaerator. The method comprises the following steps: acquiring a deaerator water level signal of the deaerator, outputting a frequency converter instruction by a PID (Proportion Integration Differentiation) controller according to the deaerator water level signal and outputting the frequency converter instruction to the condensate pump frequency converter; outputting corresponding frequency by the condensate pump frequency converter according to the frequency converter instruction and outputting the frequency to a motor; and rotating the motor according to the frequency to control the condensate pump to convey condensate water into the deaerator. The conventional condensate pump frequency conversion adjustment is realized according to three impulses of the water level of the deaerator. According to the method provided by the invention, the three-impulse adjustment is changed into single-impulse adjustment, i.e., only the deaerator water level signal is acquired, and the frequency converter instruction is output by the PID controller according to the deaerator water level signal, so that the adjustment disturbance increased by a feed water flow and a condensate water flow can be reduced, the energy consumption of the condensate pump is reduced, and the station service power consumption rate is reduced.

The invention discloses a full-load molten salt steam generating system and a control method thereof. The system is composed of a preheater, an evaporator, a steam drum, a superheater, a high-temperature molten salt tank, an intermediate-temperature molten salt tank, a low-temperature molten salt tank, a molten salt pump, a valve, a temperature measuring device and a flow measuring device. A water working medium passes through the preheater, the evaporator, the steam drum and the superheater in sequence to become overheated steam. High-temperature molten salt is subjected to heat exchange through the superheater and returns to the intermediate-temperature molten salt tank. Intermediate-temperature molten salt is divided into two paths and enters the evaporator or the preheater. Evaporator outlet molten salt is also divided into two paths and enters the low-temperature molten salt tank or the preheater. According to the system, the heat exchange process in the superheater, the evaporator and the preheater is decoupled, the molten salt flow passing through the superheater, the evaporator and the preheater can be controlled correspondingly by adjusting the opening degree of the valve when the load changes, and the solidification risk of the molten salt in the preheater is greatly reduced while stable steam parameter output is achieved.

The invention provides a water-heat-power cogeneration system and method based on seawater desalination and cascade energy consumption, and relates to the field of water-heat-power cogeneration. The system comprises a seawater desalination system, a gradient utilization system, an energy storage frequency modulation system and a station service system. The seawater desalination system is configured to desalinate drainage water of a secondary circulation cooling tower through desalination equipment to obtain desalted water and output the desalted water, and the desalination equipment takes power from the station service system; the gradient utilization system is configured to obtain steam output by a steam turbine generator unit for gradient utilization and output high-pressure industrial steam, medium-pressure industrial steam and low-pressure industrial steam respectively; and the station service system comprises working sections of two units and is connected with a back pressure machine and the energy storage frequency modulation system, and the back pressure machine and the energy storage frequency modulation system are merged into a station service network. Fresh water is prepared through seawater desalination, and the water supplementing requirement of the back pressure machine and a temperature and pressure reduction bypass system for supplying industrial steam to the outside is met. Power generated by a backpressure generator has access to the station service system, so that station service power is saved; the power for seawater desalination is from the station service system; and co-production of water, heat and power is realized.

The invention discloses an online pipe anti-blocking method for a utility boiler primary air pipe. The method comprises the steps that firstly, leveling is carried out on the air speed of primary air and pulverized coal concentration of each coal mill; secondly, a coal pulverizing system test is carried out on the coal mill, and a pulverized coal grain size database is established; thirdly, a mathematic model is established, according to parameters in operation collected in real time and the pulverized coal grain size database, the minimum fluidizing velocity of pulverized coal conveying under the theory state is calculated, a theoretical value is corrected according to the actual operation condition, the corrected minimum fluidizing air velocity is compared with the primary air speed measured online, and guiding opinions of the primary air speed are given. The online pipe anti-blocking method for the utility boiler primary air pipe can avoid the defects brought by too high primary air speed that pulverized coal ignition is delayed, the electric current of a primary air fan is too large, and air leakage of an air preheater is increased, and achieve energy saving and consumption reducing under the condition that the primary air pipe is not blocked.

The invention discloses a method for preventing blockage of a heat storage element of a rotary air preheater of a coal-fired power plant boiler. When the resistance of the air preheater is increased by 15%-20% than a design value, the rotational speed of the air preheater is adjusted according to the unit load and the exhaust gas temperature of an outlet of the air preheater to increase the temperature of the cold end of the air preheater; the air preheater runs continuously at a low speed, and when the resistance decreases to the required level, the normal operation of the air preheater is resumed; by reducing the rotational speed of the air preheater, the exhaust gas temperature is increased; and when the rotational speed of the air preheater is reduced, the heat storage capacity of theheat storage element is increased, the exhaust gas temperature can be greatly increased, the cold end integrated temperature of the air preheater is increased, and the flue gas temperature in the middle portion of the heat storage element reaches 250 DEG C, so that ammonium hydrogen sulfate is sublimated. The method has the advantages that the purposes of removing ammonium hydrogen sulfate originally attached to the surface of the heat storage element and reducing the resistance of the air preheater are achieved, the boiler efficiency is improved, the power consumption rate of a plant is lowered, and hidden dangers of lowering output or even halt of a power station are eliminated.

The invention discloses an equipment arrangement structure provided with a single-row induced draft fan behind a dust catcher and a flue gas system. The equipment arrangement structure provided with a single-row induced draft fan behind the dust catcher comprises the single-row induced draft fan, a desulfurization absorption tower and a chimney, wherein the single-row induced draft fan, the desulfurization absorption tower and the chimney are successively connected by flues; the center lines of the single-row induced draft fan, the desulfurization absorption tower and the chimney are positioned on the same plane; the desulfurization absorption tower and the chimney are both vertically arranged; the single-row induced draft fan is laterally arranged on the outer side of the desulfurization absorption tower; the outlet of the single-row induced draft fan is back onto the desulfurization absorption tower; an outlet flue is connected by directly facing the inlet of the desulfurization absorption tower after slowly rotating. All pieces of equipment behind the dust catcher are subjected to spatial combined arrangement of a horizontal straight line shape, so that the arrangement among all pieces of equipment is more compact, occupied lands are reduced, the length of connection flues is reduced so as to save the materials of the flues, all pieces of equipment behind the dust catcher are reasonably arranged, and a stereo space behind the dust catcher is effectively utilized.

The invention discloses an auxiliary engine tracking power source system for a power plant. The auxiliary engine tracking power source system comprises a high-voltage station transformer, station auxiliary engines and a tracking power source generator, wherein a turbine-drive tracking power source generator is adopted to supply power to the station auxiliary engines; the rotary speeds of the auxiliary engines, such as a draught fan and a water pump are adjusted to the optimal working condition according to requirements of different loads for air volume and water volume, so that energy loss caused by air door baffle cut-off can be avoided. The auxiliary engine tracking power source system adopts a novel energy-saving and consumption-reducing technology for the power plant, so that the station service power consumption rate of the power plant can be substantially lowered.

The invention discloses a brown coal drying power generating system capable of recycling water in coal and an implementation method of the brown coal drying power generating system. The brown coal drying power generating system comprises a boiler, a steam turbine, a water feed pump, a condenser, a coal mil, a brown coal drying device, a device for recycling the water in the coal, a raw coal bunker, a low-pressure heater, a deaerator, a high-pressure heater, a condensate pump and a steam-water mixer. The brown coal drying device is connected with the device for recycling the water in the coal, the raw coal bunker, the low-pressure heater, the deaerator, the high-pressure heater, the condensate pump, the steam-water mixer, the boiler, the steam turbine, the water feed pump, the condenser and the coal mill. Operation of a large-capacity brown coal power generating set is achieved by integral design of the brown coal drying device and the boiler and combination of the device for recycling the water in the coal and the steam turbine.

The invention provides a heliostat and photovoltaic panel combined heliostat system for tower-type photothermal power generation. The system comprises a heliostat field provided with several rows of heliostats, a heliostat control subsystem for controlling an azimuth and a horizontal angle of the heliostat, and a photovoltaic power generation subsystem for providing power for the heliostat controlsubsystem; the heliostat comprises a heliostat mirror surface main body and a heliostat support column; the photovoltaic power generation subsystem comprises a photovoltaic panel, a storage battery pack and a charging and discharging controller; the photovoltaic panel is arranged at the back of the heliostat mirror surface main body; and the photovoltaic panel at the back of the heliostat mirrorsurface main body at a front row is used for receiving sunlight reflected by the front of the heliostat mirror surface main body at a rear row sheltered by the back of the heliostat mirror surface main body at the front row. The system provided by the invention can effectively reduce sheltering efficiency loss of the heliostat field, improve power generation efficiency of a photothermal power generation station and effectively reduce power generation cost.

The invention relates to a small turbine control system based on asynchronous motor full power converter speed regulation and a control method of the small turbine control system. The small turbine control system comprises a full power converter, an asynchronous generator, a small turbine and a controller. The asynchronous generator and the small turbine are connected so as to match rotation speedparameters; the asynchronous generator and the full power converter are connected to conduct voltage and current level matching; and the full power converter and a power grid are connected to conductvoltage level matching, the asynchronous generator conducts rotation speed control through the full power converter and generates power on a grid through the surplus small turbine power, and the controller controls rotation speed control of the asynchronous generator through control over the full power converter. The small turbine control system based on asynchronous motor full power converter speed regulation and the control method of the small turbine control system have the beneficial effects that according to the technical scheme that the heat regeneration small turbine is provided with the generator, the heat efficiency of a heat regeneration system can be greatly improved, and unit losses are reduced. The electric quantity generated by the generator can be used for reducing the auxiliary power ratio, and the electricity selling incomings are increased.

The invention discloses a dust removal environment-friendly purification device which comprises a plurality of dust removal cavities. The dust removal cavities are communicated in sequence. Each dust removal cavity is provided with an air inlet and an air outlet. The air inlet and the air outlet are each provided with a filter net. Each dust removal cavity comprises a hollow dust removal device body and a hollow dust removal hopper, wherein the dust removal device body is fixedly connected to the dust removal hopper, and a sensing device is installed on the dust removal hopper. Each sensing device comprises a temperature sensor and a display device, wherein the temperature sensor is inserted into the corresponding dust removal hopper, one end of the temperature sensor is arranged in the dust removal hopper, and the other end of the temperature sensor is connected with the display device. A plurality of dust removal cloth bags are arranged inside each dust removal device body and suspended inside the corresponding dust removal device body. The dust removal environment-friendly purification device is simple in structure.

An electric energy conversion and switching system and method applied to a thermal power plant, through which the frequency and/or voltage of at least one connection terminal can be adjusted, and the electric energy can be controlled to flow between plant buses of different frequencies, or both Controlling electric energy at different frequencies can also control electric energy flowing between plant buses of the same frequency, reduce or even eliminate throttling loss, give full play to the performance of variable frequency generator sets, improve the overall efficiency of the system, thereby reducing energy consumption and creating greater economy At the same time, it improves the method of starting and switching the electric motor of the factory auxiliary machine, and improves the flexibility of the overall operation mode of the system.