280 results about "Coal power plant" patented technology

A method to integrate collected solar thermal energy into the feedwater system of a Rankine cycle power plant is disclosed. This novelty uses a closed loop, single phase fluid system to collect both the solar heat and to provide the heat input into the feedwater stream of a regenerative Rankine cycle. One embodiment of this method of integrating solar energy into a regenerative Rankine power plant cycle, such as a coal power plant, allows for automatic balancing of the steam extraction flows and does not change the temperature of the feedwater to the boiler. The concept, depending on the application, allows for the spare turbine capacity normally available in a coal plant to be used to produce incremental capacity and energy that is powered by solar thermal energy. By “piggybacking” on the available components and infrastructure of the host Rankine cycle power plant, considerable cost savings are achieved resulting in lower solar produced electricity costs.

The invention provides a composite smoke denitration catalyst capable of oxidizing zero-valence mercury. The catalyst is composite oxide V2O5-CeO2-WO3/TiO2 or V2O5-CeO2-MoO3/TiO2 based on TiO2 as a carrier, wherein the weight proportion is as follows: the weight percent of TiO2 is 75-100, the weight percent of V is 1-1.5, the weight percent of Ce is 1-5, and the weight percent of W or Mo is 7.5-8.5. The preparation method comprises the following steps: depositing Ce(OH)3 on nano TiO2; dipping ammonium vanadate/ammonium molybdate; and drying and roasting so as to obtain the catalyst; or dipping a commercial SCR (selective catalytic reduction) catalyst in a cerous nitrate aqueous solution, and then drying and roasting. The catalyst provided by the invention maintains the denitraiton efficiency of the original SCR catalyst and simultaneously the oxidation rate of zero-valence mercury is obviously improved, and divalent mercury ions are captured in subsequent dedusting equipment and wet desulphurization system; and the application temperature range of the catalyst is wide, the combination control of emission amounts of nitrogen oxides and mercury in smoke of a fuel coal power plant can be achieved on the promise that the smoke purification facility of the fuel coal power plant is not added.

A method is provided for converting organic material from domestic refuse into fuel for use in a pulverized coal power plant, comprising of mixing the organic material with at least one flammable material while adding binder, and pressing the mixture to form hard, relatively brittle agglomerates. Further provided is an installation for converting organic material from domestic refuse into fuel, comprising a device for mixing the organic material with at least one flammable material while adding binder, and device for pressing the mixture to form hard, relatively brittle agglomerates.

Methods and apparatus for pollution control which are well suited for use in a coal power plant are described. Ash is collected and injected into the flue gas stream at a location upstream of a cooling module. The ash acts as an absorbent and/or reactant material onto which condensate may condense. By re-introducing ash to keep the condensation forming wet areas within the system, lower cost materials which are less corrosion resistant than needed for wet operating conditions can be used. Mercury recovery and SO3 removal is facilitated by the cooling process and re-introduction of collected ash. Activated carbon and/or an alkali absorbent material may be added. Use of a dry ESP and/or fabric filter as opposed to a wet ESP for particulate collection leads to cost benefits. Energy recovered by the cooling of the flue gas may be re-used to heat turbine condensate leading to improved energy efficiency.

The invention relates to solid electrolyte direct carbon fuel cell. In the invention, tube-type batteries serve as the electrochemical reaction device, the inner layer of the batteries is anode, the intermediate layer is the electrolyte and the outer layer is cathode, carbon fuel is filled in the tube-type batteries. The carbon fuel cell of the invention features high energy efficiency, sound environmental protection property, a theoretic efficiency being 2-3 times of the generating efficiency of the existing coal power plants, reduction of discharge of greenhouse gas CO2, no generation of acidic gases such as nitrogen oxide and sulfide, no possible danger of liquid leakage and gas explosion and fine electrochemistry property.

The invention relates to a preparation method of a nanocrystalline Ce-Ti composite oxide catalyst used for the selective catalytic reduction of nitric oxide by utilizing ammonia and an application thereof. The preparation method of the catalyst is the homogeneous precipitation method, namely, the required cerium salt and titanium salt are prepared to mixed solution, and the molar ratio of cerium and titanium is 0.1-1.0; the solution is continuously stirred for 6-10h at the temperature of 90-95 DEG C by taking excessive urea as the precipitator and then is pumped, filtered, washed and dried; and finally, the catalyst is obtained by roasting the processed solution for 4-6h in the air at the temperature of 400-500 DEG C. In the invention, the nanocrystalline Ce-Ti composite oxide catalyst is prepared by taking non-toxic and harmless raw materials and adopting the simple and easy method, which has the characteristics of high catalytic activity, good N2 selection, wide temperature window, good adaptability of high airspeed condition, good SO2 intoxication resistance and the like. The catalyst is applicable to various tail gas sources including fixed combustion devices in an engine of a diesel vehicle, a coal-fired power plant and the like.

The invention discloses a method for preparing alumina by using power plant fly ash, characterized by: grinding the fly ash, leaching with concentrated sulfuric acid to obtain an aluminum sulfate solution, precipitating aluminum sulfate crystals by concentrating and cooling, dissolving the aluminum sulfate crystals with hydrochloric acid, then letting an HCl gas in the solution to saturate the solution to precipitate AlCl3-6H2O crystals, reacting the AlCl3-6H2O crystals with an ammonium hydroxide solution or liquid ammonia or an ammonium bicarbonate solution or an ammonium carbonate solution to obtain an aluminium hydroxide and ammonium chloride solution, calcining aluminium hydroxide to obtain alumina, displacing ammonium chloride by using magnesium oxide to obtain ammonia gas and magnesium chloride, and hydrolyzing magnesium chloride to obtain magnesium oxide and hydrochloric acid for recycling.

A process to convert carbon dioxide into a stable substance with electrolytically activated seawater and use this process to sequester carbon dioxide from coal power plants (82) and similar carbon dioxide producing equipment, and capture and sequester carbon dioxide from the atmosphere. Electrolytically activated seawater (92) is produced using a unipolar electrolytic cell (91) and is sprayed into a contacting tower (93) or into the air.

The invention relates to a SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and a preparation method thereof, belonging to the field of environment-friendly catalytic materials. Different from the traditional impregnation method, the method provided by the invention is implemented by carrying out a one-step chemical solvent thermal method on carbon nanotubes (CNTs), manganese salt and cerium salt to obtain the MnOx/CeO2@CNTs nano core-shell structure with high dispersity and high surface area of active components. The catalyst comprises a carrier CeO2@CNTs core-shell composite nano structure, and active components MnO2 and CeO2, wherein the CeO2 is used both as a carrier for further enriching the valence state of MnOx and enhancing the sulfur resistance of MnOx, and as an active component for reinforcing the conversion from NO to NO2 and enhancing the denitrification catalytic activity. The catalyst provided in the invention has excellent oxynitride removal efficiency and high N2 selectivity in fume at 120-250 DEG C. The catalyst provided by the invention can be used for SCR removal of ammonia in oxynitrides in fume discharged by coal-fired power plants, refuse incinerators, boilers and the like.

The invention discloses a method and device for achieving desulfurization wastewater zero discharging with full flue gas. The method includes the steps that desulfurization wastewater discharged froma coal-fired power plant slurry dewatering system is directly fed into a bypass bubble tower in front of a desulfurizing tower, and then is subjected to reducing concentration with hot flue gas in front of the desulfurizing tower; desulfurization wastewater concentrated water is fed into three connection tanks for charging treatment; settled supernatant liquid is fed into a wastewater tank to be buffered and stored; part of waste heat flue gas is led out behind an electrostatic dust collector and is further pressurized through a high-pressure fan to be fed into an inlet of a Venturi atomizingtube; the desulfurization wastewater stored in the wastewater tank is led into the Venturi tube through negative pressure at a pipe opening of the Venturi tube, high-speed airflow at the throat position of the Venturi tube can impact and atomize the led-in desulfurization wastewater, and meanwhile the waste heat flue gas and liquid drops are subjected to forceful heat transfer so that the pre-evaporation effect on the liquid drops can be achieved; and solid evaporated products are captured by the follow-up electrostatic dust collector or a bag-type dust remover, and therefore low-cost zero discharging of the desulfurization wastewater can be realized.

The invention relates to a monitoring method for a power plant water system and a full-digitalized self-balance water affair system, wherein the method and the system are applicable to an industrial project with a waste water pollution discharge circulation and environment-friendly water utilization system, for example, a coal power plant in an industrial zone. The method includes the steps that first, a water utilization system comprising a control system, a water supply system and a water discharge system is established through a field bus technology, and water quantity balance instruments are arranged on water inlets and water outlets of all water utilization points of the water utilization system; second, the water quantity balance instruments are connected into the control system so as to monitor water inflow and discharge conditions in all places in real time, output data of the water quantity balance instruments are calculated in the control system so as to obtain water utilization volumes and water discharge volumes in all the places, and water inflow and utilization balance is achieved through control of the control system; third, intelligent equipment with field bus connectors are adopted for all kinds of transmitters and analysis instruments related to the power plant water utilization system, and thus full-digitalized real-time monitoring is achieved. The invention further discloses the self-balance water affair system for full-digitalized monitoring on water for power plants. The self-balance water affair system achieves water quantity self-balance and waste water zero discharge.

The invention discloses a method and system for efficiently controlling mercury pollution of a coal-fired power plant at low cost. The system comprises a primary hot air duct, a secondary hot air duct and a liquid storing tank, wherein the primary hot air duct and the secondary hot air duct are communicated with an air preheater and a hearth; a coal conveying system is communicated with a coal grinding system through a coal feeder; the liquid storing tank is filled with a halide additive solution; and the liquid storing tank is communicated with at least one of the coal conveying system, the coal feeder, the primary hot air duct and the secondary hot air duct. According to the system, the halide additive solution enters a boiler body and participates in a combustion reaction, the oxidation of the mercury in flue gas is promoted and the ratio of mercury oxide in the flue gas is increased, so that the synergetic demercuration effect of flue gas purifying equipment such as denitration equipment, desulfurization equipment, dedusting equipment and the like in a tail flue of a boiler is improved, and the mercury content of flue gas in a chimney is greatly lowered. A mercury pollutant control system has the advantages of small investment and low running cost while the mercury pollutant emission level of the coal-fired power plant can meet stricter environmental standard requirements.

The invention relates to a ceramic composite pipe used for conveying stack gas desulphurization slurry from electric power plants. An inner layer of the composite pipe is a ceramic pipe and an outer layer is a metal pipe; the interface layer between the inner layer and the outer layer is a plastic pipe; the inner diameter of the composite pipe ranges from 80mm to 450mm. The ceramic composite pipe is characterized by having anti-corrosion and anti-wearing property and long service life.

Disclosed is a gaseous fossil fuel fired, indirectly heated, Brayton closed cycle comprising an alkali metal seeded noble gases that is rendered non-equilibrium, electrically conducting in a magnetohydrodynamic (MHD) electric power generator with zero emissions from the combustion products, including physical separation and sequestration of the carbon dioxide (CO₂) what is emitted from the fossil fuel, with said cycle combined with a Rankine steam turbine bottoming cycle to compress the noble gas, while another optional new or existing Rankine steam cycle is placed in parallel and separate from the MHD cycle, and it is fired by the solid char remaining if the MHD cycle is fired with the devolatilized coal, and/or with solid coal culm, and/or unburned carbon in coal power plant waste ash, in order to achieve high efficiency at low capital, low operating, and low fuel costs.

The invention relates to a preparation method of a copper-foam-based hierarchical composite oxide monolithic denitrification catalyst, and belongs to the field of environment-friendly nano catalyst materials. The catalyst includes main active components of CuO and Fe2O3. The hierarchical composite oxide monolithic denitrification catalyst is prepared by the steps of promoting in-situ growth on the surface of copper foam which is taken as a support carrier through oxidization to form a CuO nano line; under a hydrothermal condition, promoting in-situ deposition on the CuO nano line through hydrolysis of ferrous ions, and washing, drying and calcining to obtain the monolithic denitrification catalyst. The catalyst disclosed by the invention has the advantages of being simple in preparation method, free from molding, uniform in active component distribution, rapid in thermal response speed, good in denitrification performance and the like. The synthesized catalyst is applicable to treatment of nitrogen oxides in tail gas discharged from coal-fired power plants, garbage incinerators, steel mills and the like.

The invention discloses a method for recycling water and heat in flue gas discharged by a coal-fired power plant and a system thereof. The method is realized by two systems, namely a hollow fiber membrane water vapor trapping system and a heat pump system. The hollow fiber membrane water vapor trapping system comprises a membrane assembly, a condenser A, a vacuum pump, a condensate water pump andwater purification equipment; the heat pump system comprises an evaporator, a compressor, a condenser B and an expansion valve connected end to end by a heat exchange circulating pipeline A so as to form a circulation loop, and provides a cold source for the hollow fiber membrane water vapor trapping system by condensing the trapped water vapor into water so as to realize water recovery; the hollow fiber membrane water vapor trapping system provides a heat source for the heat pump system for heating boiler circulating water so as to realize heat recovery. According to the method disclosed by the invention, 20-40% of water and heat in the flue gas discharged by the coal-fired power plant can be recycled, and the aims of saving water and energy can be achieved; meanwhile, the parameters of the flue gas discharged by the power plant are improved, and the white smoke phenomenon and gypsum rain problem can be avoided.

The invention discloses a method for accurate measurement of carbon emission from a coal-fired power plant. The method is used for measuring the carbon emission Wg generated from raw coal in preset consumption Wcoal consumed in a fire coal life cycle by the coal-fired power plant, and comprises the following steps: step S10, measuring the carbon emission W3 produced in the early combustion stage of the fire coal from the coal-fired power plant; step S20, measuring the carbon emission Wgr generated in the middle combustion stage of the fire coal from the coal-fired power plant; step S30, measuring the carbon emission generated in the later combustion stage of the fire coal from the coal-fired power plant, wherein the carbon emission includes carbon emission Ws produced in the desulfurization process, carbon emission Wn produced in the denitrification process and carbon emission Wc generated in the decarburization process; and step S40, calculating the carbon emission (Wg= W3+Wgr+Ws+Wn+Wc) generated from raw coal in preset consumption Wcoal consumed in a fire coal life cycle by the coal-fired power plant. The invention adopts the carbon emission calculation range suitable for coal-fired power plants in China and optimal calculation method for measurement of carbon emission from coal-fired power plants, and has the advantage of high accuracy of measurement.

The invention provides a process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater, and belongs to the technical field of sewage treatment. The process involves a desulfurization wastewater treatment unit, a landfill leachate treatment unit, a phosphorus-containing wastewater treatment unit and a calcium magnesium ammonium phosphate generation unit; the desulfurization wastewater treatment unit is used for treating desulfurization wastewater of a coal-fired power plant to obtain a calcium-containing solution; the landfill leachate treatment unit takes ammonia nitrogen escaped from landfill leachate in a steam stripping deamination process as an ammonia nitrogen source; the phosphorus-containing wastewater treatment unit is used for treating phosphating wastewater or phosphogypsum slag field leakage liquid to obtain a phosphorus-containing solution; the calcium magnesium ammonium phosphate generation unit is used for mixing a calcium/magnesium solution, the ammonia nitrogen and the phosphorus-containing solution, adjusting the pH value and then performing a reaction to obtain calcium phosphate,calcium fluoride, calcium hydrophosphate and magnesium ammonium phosphate precipitate. Industrial wastewater is comprehensively treated, and calcium and magnesium ions in desulfurization wastewater, nitrogen and ammonia in the landfill leachate and phosphorus in the phosphorus-containing wastewater are used for preparing a compound fertilizer raw material calcium magnesium ammonium phosphate.