摘要:
A geothermal power system utilizes a fluid refrigerant capable of changing phase between liquid and gaseous states. The system includes a heat exchanger exposed to a heat source such as earth, water, air, or industrial waste for vaporizing the fluid in the heat exchanger. The heat exchanger includes at least two compartmentalized heat exchanger cells. Each of the heat exchanger cells is disposed in a portion of the naturally occurring heat source, the portions being sufficiently spaced apart such that a temperature of any one portion is substantially unaffected by a temperature of any other portion. The vaporized fluid is directed to a turbine or energy extraction means wherein the gas is expanded and energy is re)eased in the form of mechanical rotation of a shaft. The turbine shaft may be coupled to a generator for converting the mechanical rotational energy to electrical power. The gas discharged from the turbine is cooled/condensed and circulated into an accumulator, with a sensor and a controller for continuously maintaining the optimum amount of refrigerant flowing in the system under particular heat source/heat sink conditions. The liquid refrigerant is then recirculated to the heat exchanger, and the process is performed continuously. A compressor and sensored and controlled accumulator may be utilized in a second and separate refrigerant heat exchange loop with compartmentalized heat exchanger cells if necessary to maintain continuous output from the geothermal power system under all temperature conditions.
摘要:
A polymer concrete pipe liner is formed from a fluidized, but substantially waterless cement containing mixture applied to the pipe interior. The mixture is composed of inorganic cement particles, a liquid styrene mixture and a minor amount of one or more poly-olefinically unsaturated co-monomers. The mixture substantially excludes acrylonitrile and acrylamide. The co-monomers are preferable selected from a group including trimethylolpropane-trimethacrylate, divinyl benzene, hexadiene, and polyvinylsiloxanes. Mixing the liquid and solid components forms a slurry which is transferred to a pipe interior. Transfer properties can be controlled by particulate gradation, dissolved polymers, and rheology control additives. The pipe is then spun to centrifugally cast the liner. The composition avoids the need for high temperature curing and toxic reactive unsaturates to co-polymerize and cross-link polystyrene. Like the current polymer concrete materials, the materials embodied in the present invention have adequate strength at geothermal operating temperatures and reduced permeability, but they achieve this result without either a significant loss of broad spectrum chemical resistance to harsh geothermal environments or a large increase in cost. Other embodiments also incorporate the use of pozzolanic solids and high alumina cement to further improve chemical resistance characteristics.
摘要:
Spent geothermal fluid from a geothermal power plant comprises geothermal vapor in the form of steam and non-condensable gases, and geothermal liquid in the form of mineral-rich brines. A silencer, which receives the spent geothermal fluid, includes a chamber for receiving the spent fluid and which has a lower outlet from which the brine flows. The chamber has an upper outlet through which the geothermal vapor flows. A heat exchanger is connected to the upper outlet, the heat exchanger having a first portion for receiving the geothermal vapor and the second portion containing a working fluid that is vaporized by the heat contained in the geothermal vapor. As a result, the cooled geothermal vapor produces a low pH condensate and non-condensable gases in the first portion. The brines exiting the silencer through the lower outlet are combined with the low pH condensate and with the non-condensable gases to form waste fluid which may be disposed of by injection into a reinjection well.
摘要:
In a geothermal electric power generating plant of the type wherein a flow stream of hot geothermal brine is partially flashed to steam for turbine motive power, a system and method for removing entrained brine droplets and particulates from the flashed steam so as to protect turbine components from being fouled and damaged, and also to protect flash vessel demisters from being clogged and corroded. The hot geothermal brine is flashed to steam in flash crystallizer vessels, each of which receives the hot geothermal brine flow stream in its lower portion and has a baffle tray system in its upper portion through which the flashed steam passes. The baffle tray system provides a sinuous path for the flashed steam which produces a series of centripetal accelerations of the steam so as to centrifugally separate the entrained materials from the steam onto surface portions of the baffle tray system and wall portions of the upper portion of the flash crystallizer vessel. These separated entrained materials are flowed back down into the brine flow stream in the lower portion of the flash crystallizer vessel.
摘要:
Apparatus is provided for treating a flow of hot, pressurized, hydrogen sulfide-containing geothermal steam, particularly a flow of high-energy, surplus steam substantially as produced from the ground. The apparatus comprises a first condenser in which most of the steam in the flow is condensed, and a first separator in which the steam condensate is separated from residual amounts of steam and non-condensable gases (including hydrogen sulfide). An after-cooler is provided for cooling the condensate to a disposal temperature of less than about 200.degree. F. before the condensate is discharged into a disposal well, the disposal temperature being such as to create a vacuum in the disposal well. A second condenser is provided in which is condensed a substantial amount of the steam in the mixture of residual steam and non-condensable gases, the condensate being separated from a mixture of residual steam and non-condensable gases in a second separator. Condensate from the second separator is combined with condensate from the after-cooler and is discharged therewith into the disposal well. The mixture of non-condensable gases and residual amounts of steam is also discharged from the second separator into the disposal well, being drawn thereinto by the vacuum in the well. A corresponding method is provided for treating a flow of geothermal steam so as to control hydrogen sulfide emissions therefrom.
摘要:
A geothermal steam turbine plant comprises a steam turbine operatively connected to a production well, an indirect-contact type main condenser into which a geothermal steam including non-condensed gas is introduced from the steam turbine, and a cooling water supply system for supplying cooling water to the main condenser. The non-condensed gas contained in the geothermal steam is ejected by a gas ejecting system comprising a geothermal steam jet ejector connected to the main condenser, a direct-contact type condensing system connected to the steam jet ejector for condensing the geothermal steam into the geothermal water including substantially no non-condensed gas by directly contacting the steam to the condensate from the main condenser, a pipe line for returning the condensed water from the condensing system to the main condenser, and a condensate water pipe line for circulating the condensate water pooled in the main condenser to the condensing system so as to be independently located from the cooling water system. The condensate water pipe line is branched from a condensate water pump assembled in a pipe line extending outwardly from the bottom of the main condenser.
摘要:
A method of collecting geothermal steam using Acoustic Emission Microseismic Activity (AE/MA) measurement includes the steps of (a) surveying an AE wave emitted in subsurface cracks to obtain the size of a water permeable geothermal reservoir by analyzing the AE wave, (b) further surveying the AE wave emitted in and around the periphery of the geothermal reservoir, (c) operating the wellhead valve of the geothermal well connected with the geothermal reservoir, thereby extending or preventing the extension of the geothermal reservoir in accordance with the information obtained in step (a) and/or step (b), thereby stably obtaining a predetermined quantity of steam of high quality. Thus, the method can stably obtain geothermal steam of high quality by accurately surveying or monitoring subsurface cracks by an AE measurement technique and propagating the subsurface cracks or suppressing the propagation of the cracks.
摘要:
An apparatus for continuous measurement of the proportion of relatively non-condensable gases in a flow of mixed gases, such as geothermal steam. The apparatus is an open system which detects the proportion of relatively non-condensable gases in a sample flow continuously. The sample flow is condensed and supplied in a tube which conditions the sample flow to consist of a series of segments of condensate and segments of uncondensed gases. The sensor senses the relative volume of the condensate and the uncondensed gases. The data processing means receives the output of the sensor and calculates the proportion of non-condensable gases in the flow of mixed gases. In the preferred embodiment, the sensor optically detects the ratio of the volume of the condensate to the volume of uncondensed gases. Also disclosed are applications of the apparatus for supplying the continuous measurement of the proportion of non-condensable gases in a flow of mixed gases for use in the monitoring of geothermal steam supplied to an end user.
摘要:
Certain impure steams, especially those from geothermal sources, are contaminated with gaseous substances such as hydrogen sulfide, ammomia, carbon dioxide, substances comprising boron, arsenic and mercury, other gases, as well as finely divided particulate solid matter in a form resembling dust or smoke. These contaminants reduce the efficiency of the steam as a heat transfer fluid and are detrimental to equipment utilizing steam as an energy source. Furthermore, discharges from the utilization of such impure steams result in pollution of the environment or necessitate expensive requirements for limiting the same. The present invention describes apparatus wherein so contaminated steam is selectively processed at superatmospheric pressure for removing one or more of said contaminants and, after reduction of its energy content by pressure reduction and/or condensation of the steam, gases substantially free of hydrogen sulfide are discharged to the atmosphere. The apparatus includes means for contacting the impure steam with an aqueous liquid containing reactant capable of reacting with at least one of said contaminants in the steam, e.g. hydrogen sulfide, to form non-gaseous reaction products including solids, e.g. metal sulfides, and for separating and removing solids from the aqueous liquid phase. Means are also described for recycling untreacted reactant and/or for regeneration of reactant from metal sulfide, and for recovering byproducts from the reaction products. By use of the described apparatus, the utility of impure steam may be improved and pollution of the environment from emission of hydrogen sulfide and other contaminants may be avoided.
摘要:
Steam from a geothermal source is usually contaminated with gaseous impurities including, inter alia, one or more substances comprising boron, arsenic and mercury. Such contaminants are detrimental to the equipment utilizing the steam as an energy source and also result in environmental pollution. Herein, a flow of geothermal steam at elevated temperature and superatmospheric pressure is processed upstream of said equipment by contacting the steam with an aqueous liquid whereby said impurities are extracted from the steam and transferred to the aqueous liquid while maintaining the steam at substantially said elevated temperature and pressure.