摘要:
A geothermal energy installation and system, in which the field of potable water is utilized by a secondary conduit system to route potable water from an inlet in the user's line coming from the potable water field but upstream of the user's meter, through the heat exchanger equipment of a user, and back to the field at a point upstream of the final treatment processing stage of the field. Thus, the thermal energy of the water of the field is utilized without adding the cost of the volume of potable water use by the user, and is re-processed if somehow contaminated in the secondary conduit systems; and although the secondary conduit system delivers water back to the field at a changed temperature, depending upon the heat exchanger effect, the relatively large volume of water of the potable water field assures that the returned water does not even substantially alter the temperature of the potable water field.
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 preferably 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:
The invention concerns low molecular weight copolymers of acrylic acid or at least partially salified acrylic acid and acrylamide, their process of manufacture and their use. These copolymers may be used to prevent the formation of deposits on the walls of oil or geothermal equipment from aqueous systems containing dissolved salts. The copolymer is characterized in that it comprises recurrent units deriving from acrylic acid and acrylamide in a proportion by weight from 95:5 to 25:75. Furthermore, the distribution of the molecular weights of the copolymer, as determined by exclusion analytic chromatography, is such that at least 60% of the weight molecular weights are lower than 500.
摘要:
Process and system for recovery of energy from geothermal brines and other hot water sources, by direct contact heat exchange between the brine or hot water, and an immiscible working fluid, e.g. a hydrocarbon such as isobutane, in a heat exchange column, the brine or hot water therein flowing countercurrent to the flow of the working fluid. The column can be operated at subcritical, critical or above the critical pressure of the working fluid. Preferably, the column is provided with a plurality of sieve plates, and the heat exchange process and column, e.g. with respect to the design of such plates, number of plates employed, spacing between plates, area thereof, column diameter, and the like, are designed to achieve maximum throughput of brine or hot water and reduction in temperature differential at the respective stages or plates between the brine or hot water and the working fluid, and so minimize lost work and maximize efficiency, and minimize scale deposition from hot water containing fluid including salts, such as brine. Maximum throughput approximates minimum cost of electricity which can be produced by conversion of the recovered thermal energy to electrical energy.
摘要:
Water is thermochemically decomposed to produce hydrogen by the following sequence of reactions: KI, NH.sub.3, CO.sub. 2 and water in an organic solvent such as ethyl or propyl alcohol are reacted to produce KHCO 3 and NH.sub.4 I. The KHCO.sub.3 is thermally decomposed to K.sub.2 CO.sub.3, H.sub.2 O and CO.sub.2, while the NH.sub.4 I is reacted with Hg to produce HgI.sub.2, NH.sub.3 and H.sub.2. The K.sub.2 CO.sub.3 obtained by calcining KHCO.sub.3 is then reacted with HgI.sub.2 to produce Hg, KI, CO and O.sub.2. All products of the reaction are recycled except hydrogen and oxygen.
摘要:
The invention provides an evaporation process and apparatus for an aqueous solution containing dissolved solids, such as mineral salts, without adherence of the solids to any surface contacting the aqueous solution. Heated immiscible oil is used as the heat transfer liquid which makes liquid/liquid contact with the solution, preferably in the form of a highly dispersed mixture of the solution and oil from a cooler part of the system in a mixing chamber whereby the solution droplets are vaporized by intimate contact with the hot oil. The mixture of hot oil and aqueous solution is fed from the mixing chamber into an evaporation chamber wherein all or a portion of remaining aqueous solution is converted to vapor by cascading downward over baffles, and the solids and liquid components of the mixture are separated into strata in the lower portion of the evaporating chamber. The oil stratum is continuously withdrawn, most of it being re-cycled to the heating and evaporation zones. The aqueous solution stratum is continuously withdrawn and re-cycled to the original evaporation step or on to a second stage evaporation step if so desired. The solids slurry is removed separately for separation of solids from liquids in a suitable solids-liquid separator. Apparatus surfaces exposed to the aqueous solution including particularly the mixing chamber, the heating elements in the oil heating chamber, and the evaporation chamber and parts therein are coated with a material which is preferentially oil wettable and zero water adsorbent. The immiscible oil circulating through the mixing chamber and evaporation chamber wets the surfaces therein, preventing adherence of solids and acting as a flushing agent to prevent sedimentation of solids thereon. All contacting apparatus surface is exposed to the aqueous solution should be smooth and free from sharp edges and should, preferably, be preferentially oil wettable. Multiple stage evaporators (details not shown) utilizing the methods herein disclosed may be used in order to conserve heat and selectively separate mineral components where feasible.
摘要:
A "DX" heat pump is provided herein which is based on the principle of providing optimal heat exchange in the heating mode through at least two, but up to five or more parallel ground loops, all but one of which respectively can be cut off from the system and evacuated of refrigerant in the cooling mode, and selectively reintroduced as required in the cooling mode. The loops are designed in terms of volume so that the refrigerant charge is correct in the heating mode when split in the selected number of loops and also correct in the cooling mode when one or more loops are used, whereby it/they contain the full system refrigerant charge. The headers are provided with solenoid valves which can be individually operated to provide a staged cooling system.
摘要:
A "DX" heat pump is provided herein which is based on the principle of providing optimal heat exchange in the heating mode through three parallel ground loops, two of which can be cut off from the system and evacuated of refrigerant in the cooling mode. The loops are designed in terms of volume so that the refrigerant charge is correct in the heating mode when split in three loops and also correct in the cooling mode when only one loop is used, but it contains the full system refrigerant charge. The loops are provided with "TX" metering valves which can be individually operated to provide a staged cooling system.
摘要:
A thermosyphon for use in frozen or unfrozen soil includes an evaporator tion embedded in the soil, a condenser section exposed to ambient air, an intermediate section connecting the two sections and a heat exchanger connected to a mechanical refrigeration source and operable to cool either the condenser or the intermediate section of the thermosyphon during periods when the ambient temperature is higher than that at which passive thermosyphonic cooling occurs.
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.