摘要:
A process and apparatus for improving the thermal efficiency of a steam turbine power generating plant while simultaneously desalinating seawater or brine and purifying water which contains minerals, salts, and other dissolved solids. Exhaust gases from a power plant is heat exchanged against water in a secondary ecomomizer which circulates water at a temperature near, or slightly above the dewpoint of the combustion exhaust of the high-pressure boiler. The heated water is flashed to produce low-pressure steam. The low-pressure steam is condensed against the last effect of a multi-effect desalinization unit. Steam from the first effect of the desalination unit is condensed against steam condensate from the power plant turbine to preheat the condensate and thereby recover heat from the power plant's exhaust gas. Salinous water is fed to the multi-effect desalinization unit to produce fresh water and a concentrated brine. The low-pressure steam is used to replace high-pressure steam that is used for preheating and deareation of feedwater for the boiler.
摘要:
A process and apparatus for desalinating seawater or brine and purifying water which contains minerals, salts, and other dissolved solids while simultaneously generating power. The salinous water is heated in a boiler to form steam and a concentrated brine. The concentrated brine is removed from the boiler, the steam produced in the boiler is washed with fresh water to remove trace salts and inorganic materials, and water bearing trace salts and inorganic materials are returned to the boiler. The washed steam is expanded across a turbine to generate electrical or mechanical power which is utilized as a product. The steam exhausted from the turbine is collected and condensed, and one portion of the condensed water is utilized as a fresh water product and another portion of the condensed water is used as the wash water to wash the steam produced in the boiler. Energy efficiency is improved by heat exchanging the hot concentrated brine against the salinous feed water or by flashing the brine to produce steam. Boiler scaling and corrosion may be controlled by feed water pretreatment. By utilizing distillation combined with power generation, demand for fresh water and power can be satisfied simultaneously. Efficiency is further improved by utilizing a low pressure boiler at lower temperatures for desalination in conjunction with a high pressure boiler for producing power.
摘要:
A process for producing liquid carbon dioxide. A process stream which comprises carbon dioxide, balance substantially nitrogen and water, is cooled so that a minor amount of the water is condensed out. The process stream is compressed so that substantially all of the water but trace amounts is condensed out. Next, the process stream is cleaned to remove the trace amounts of water, any long-chain hydrocarbons present and any particulates present. The process stream is then separated into a nitrogen-rich gaseous stream and a carbon dioxide-rich gaseous stream. The carbon dioxide-rich gaseous stream is then compressed and the nitrogen-rich gaseous stream is expanded to produce an expanded nitrogen-rich gaseous stream. The energy of the expanding is used to compress the carbon dioxide-rich gaseous stream. The compressed carbon dioxide-rich gaseous stream is cooled to liquefy the carbon dioxide in the stream and reduce the temperature of the gaseous nitrogen in the stream. The liquefied carbon dioxide is withdrawn as product. The liquefying of the carbon dioxide-rich gaseous stream is by using the expanded nitrogen-rich gaseous stream. After the liquefying, the nitrogen-rich gaseous stream is used to perform at least part of the first cooling. In a preferred form, the process stream results from combusting a mixture of fuel and oxygen in a heat engine to drive an electrical generator with the product of the heat engine to produce electricity and also yielding the process stream. Apparatus for the production of liquid carbon dioxide which includes devices to perform each of the process steps.
摘要:
A system for concentration of waste cooling tower blowdown in a steam turbine power plant. The cooling tower blowdown feed is withdrawn from a main power plant condenser and is recirculated through an auxiliary cooling tower and an auxiliary condenser. The auxiliary condenser utilizes waste heat steam drawn from the main condenser as an energy source. Evaporation continuously takes place in the auxiliary cooling tower concentrating the cooling tower blowdown so that it may be withdrawn and sent to a concentrating pond or other slurry handling station for final disposal.
摘要:
The aqueous substance, for example sea water, is boiled, the steam produced is fed under pressure into a turbo-alternator turbine producing electricity, the residual steam is reduced into soft water and the residue of evaporation, for example sea salt, is recovered as a by-product.The steam is fed directly or on leaving the turbine onto iron heated to about 800.degree. C., which supplies hydrogen and as a by-product ferric oxide. The initial source of energy is, besides solar energy, any known source of energy, such as coal situated at great depths. The starting aqueous substance is, apart from sea water, waste sludges, a rock salt solution or a mixture of sludges and salt solution. In the case of sludges, the by-product is a dry and sterilized fertilizer transformable into fuel bricks. The salt residue is transformable by electrolysis into hydrogen and sodium chlorate, which is a fuel. The sludge-salt residue supplies a combustible mixture. Dried sludges-sodium chlorate, is mixable with household waste for promoting the combustibility thereof. The sodium chlorate can be transformed into potassium chlorate and the steam under pressure may be condensed in distant reservoirs and its heat recovered. The energies produced in the turbo alternator or fuel-by products are usable in the process.
摘要:
Steam is produced from aqueous brine, by a process that employs hot fluid, nozzle means and rotary separator means. Process steps include:(a) transferring heat from said hot fluid to said brine,(b) passing the heated brine in pressurized state to the nozzle means for flow therethrough, and expanding the flow therein thereby to form steam and liquid droplets, and(c) causing said expanded flow to rotate the rotary separator means for forming a layer of said brine on the separator means and accompanied by steam separation and for subsequent removal.The liquid from the rotating layer and/or the separated steam may be used to drive turbine means; the hot fluid may comprise combustion products from a combustion source; and several stages of separators may be employed.
摘要:
In a chemical processing plant such as a petroleum refinery, provision is made for steam boilers and heating furnaces in which the energy consumed by the boilers for generating steam exceeds the energy consumed by the heating furnaces. The steam is produced at a pressure level which is sufficient to operate at least one back-pressure turbo-alternator, then to heat the chemical process stream to a sufficiently high temperature by heat exchange with the steam recovered at the outlet of the turbo-alternator.
摘要:
A steam condensation plant comprising a plurality of condensers incorporates a flash distillation apparatus which includes an instantaneous vaporization and condensation chamber associated with at least one of the condensers. Impure feed water for the apparatus comprises cooling water from the plant and is derived from downstream of said one of the condensers.
摘要:
The invention described herein relates to an improved water and power plant system. The system consists of a means for producing steam which is used for a steam turbine prime mover driving an electrical generator. Steam is extracted from the steam expansion cycle to operate the water plant. High efficiency is achieved by operating the turbine at pressures and temperatures similar to a power-only plant. Thermal economy for the water plant is gained by using the exhaust steam of the turbine to preheat the water plant feed. Additional thermal economy is gained by recovering energy from the water plant discharged concentrated impure water and product water.
摘要:
1,169,263. Evaporators, flash type; desalination of sea water. AMERICAN MACHINE & FOUNDRY CO. 11 April, 1967 [18 April, 1966], No. 16440/67. Heading B1.B. [Also in Division F1] Heated sea water is passed from line 22 serially through the flash chambers of a multi-stage flash evaporator which are maintained at successively lower pressures, the vapour flashed off from the sea water in the chambers of the stages 106 e , 106 f at lowest pressure, preferably in excess of atmospheric pressure, is passed through lines 124, 126 to a low-pressure turbine 38 which is coupled to a generator 40 for producing electric power, and the vapours produced in the other flash stages are condensed directly on the condenser tubes associated with these flash stages. The condensate is. withdrawn from the evaporator to cooler 70. The exhaust steam from turbine 38 is passed to condenser 44, from which the condensate mixes in line 50 with the distillate from cooler 70, thus collecting the desired product, i.e. desalinated water, which is withdrawn from the system. As shown, the evaporator has two sets of flash stages 100, 102, associated with a heater 20 supplied with steam from turbine 128 which is itself supplied with high-pressure steam from nuclear reactor 10. The sea water to be distilled is used as cooling-medium in condenser 44, and is then pumped through either distillate-cooler 70 or a brine-cooler 72. The sea water is then treated with acid and is introduced into deaerator 78 from which carbon dioxide and air are withdrawn by eductor 80, operated by a stream of sea water. The de-aerated sea water is pumped through the condenser tubes 108, 110 of the evaporator, and then flows through heater 20 where the temperature of the water is raised to about 260‹-290‹F. The heated sea water then enters the first flash stage 104a. A portion of the brine from stage 104f is mixed with the feed sea water in the condenser tube of stage 104d, and the remaining brine is fed to the first flash stage 106a of the second set 102. Part of the brine is pumped from the last flash stage 106f through heat-exchange tubes 120, 122 and then mixed in line 116 with the brine flowing into flash stage 106a. The remainder of the brine from stage 106f is discharged from the system through cooler 72. After treatment in deaerator 78, the feed may be preheated by heat-exchange with waste heat from nuclear reactor 10, or bleed steam from turbine 38.