RU2529769C2 - Petrothermal power plant and mounting device for heat takeoff system of petrothermal power plant - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to the field of power engineering, in particular to power plants using the energy of deep heat of the Earth. Petrothermal power plant comprises a well, drilled down to the depth with the bottomhole temperature no less than 600° C, the heat take-off system located in the well, containing the steam boiler, two connected pipelines, each of which consists of separate parts, and the parts of the water injection pipeline are connected with the parts of the steam removal conduit with rigid bars forming the sections, while a part of the well near the steam boiler with coverage of its heating zone, is filled with a water-proof material, the other part of the well is filled with rock lifted to the surface during well drilling with observance of its location in earth crust in the place of drilling. The mounting device of heat take-off system of petrothermal power plant includes a mounting derrick with the hydrolift, bench, made as a sliding welding table with chamfers forming at the centre of the table, when these parts are connected, an opening with the possibility of advancement through it into the well of sections of the heat take-off device.

EFFECT: reliable operation of petrothermal power plant, power increase is ensured.

5 cl, 4 dwg

Description

The invention relates to the field of energy, in particular to installations of autonomous electric and heat supply based on the deep heat of the Earth.

A device is known that implements a method of extracting geothermal heat (RU No. 2288413, MPK7 F24J 3/08, 11/27/2006), comprising a heat pump, a heat consumer, a cold consumer, and a well with a casing located inside it, inside which a lifting pipe is installed.

The disadvantage of this device is that the device does not allow the generation of electrical energy, that is, it has limited functionality.

A known system for capturing the deep heat of the earth and releasing heat during exothermic reactions to convert to electrical energy containing a well having a wellhead and a bottom, said well being drilled to a sufficient depth to capture energy from the deep heat of the Earth when the initial reagents are introduced into said well to cause reactions of these reagents; a device located in the bottom of the specified well, and the specified device captures the deep heat of the Earth to receive and separate output products; first and second pipelines for transporting said output products to the mouth of said well; and means connected to said first and second pipelines and intended for using output products to generate exothermic reactions for generating electricity (RU 2162991 C2 F24J 3/08, 02/10/2001).

The disadvantage of this system for converting geothermal energy is the complexity of its design, in particular the need to install a large number of reaction chambers, pumps, valves and other equipment to implement the mechanism of transportation of chemical compounds obtained in the process of endothermic and exothermic reactions.

A known method of generating electricity using geothermal energy and kinetic energy of falling water (GR 1005512, F03G 7/04, 05/08/2007).

The disadvantage of this method is its binding to a specific geographical landscape - mountainous terrain, with the possibility of placing at a given height a refrigerator, a water tank and other equipment, the complexity of installation of equipment associated with combining a geothermal installation with a system located on the ground and with a system located at high altitude.

Closest to the claimed invention is a geothermal installation of energy supply to consumers, selected as a prototype, containing a circuit for removing the heat of the Earth, a circuit for evaporating and condensing the working fluid of the turbine, a condenser cooling circuit and a consumer heating circuit. From the Earth’s heat removal circuit, heat is transferred to the evaporation and condensation circuit of the turbine’s working fluid, as well as directly to the consumer’s heat supply circuit connected to the condenser cooling circuit through a heat pump (RU 2330219 C1, F24J 3/08, 07/27/2008).

This geothermal installation, due to its design features, in particular the location of the lifting pipe of the Earth's heat removal circuit inside a hermetically sealed lowering pipe, cannot have high power, due to the fact that the coaxiality of the pipe arrangement is technically difficult to ensure with a large depth of the well, as is known from literary sources (Nikolai Gnatus, Alexander Nekrasov, Svetlana Voronina. The heat of the Earth will warm small towns. World Energy magazine No. 1 (60), January 2009), the temperature of deep soil and in wells with a depth of less than 4-6 km, it reaches 100-200 ° C, which is not enough to generate electrical energy. In addition, the known installation will not allow to deliver heat from great depths, due to the inability to provide sufficient lifting force (pressure) in the lifting pipe.

The present invention is directed to solving the problem of ensuring reliable performance and increasing the power of a power plant using the heat of petrothermal energy sources (heat of dry hot rock, heated by magma) from any depth of the earth's crust.

The technical result is achieved due to the design features of the claimed petrothermal power plant and device for its installation, allowing to use energy from great depths equal to the depths of deep and superdeep wells, as well as wells with a depth determined in each case by the temperature required for generating the electric well bottomhole .

The problem is achieved in that a petrothermal power plant containing a well drilled to a depth sufficient to capture the energy of the Earth’s deep heat; a heat removal system located in the bottom of this well, containing two pipelines; ground equipment, including a separator, condenser, cooling and condensate return systems, according to the claimed invention includes a well drilled to a depth determined by a bottom temperature of at least 600 ° C, in the bottom of which there is a steam boiler with heat-transfer system pipelines connected to it - a discharge pipe water into the steam boiler and the steam pipe for the removal of steam from the steam boiler, located parallel to each other and consisting of separate parts, and parts of the pipeline for pumped water is connected to the parts of the steam pipe for the removal of steam by hard bridges with the formation of sections, while part of the well in the area of the steam boiler with the capture of the heating zone is filled with waterproof material, the rest of the well is filled with rock raised to the surface while drilling the well in accordance with the order of its location in the earth’s crust at the drilling site

The junction of the pipe sections can be equipped with reinforcing belts.

The junction of parts of the water injection pipe may further comprise a protective coating layer.

The junction of parts of the steam line can be protected by a layer of thermal insulation.

The task to which the invention is directed is also achieved by the fact that the mounting device of the heat-extraction system of the petrothermal power plant includes a mounting tower with a hydraulic lift, a mounting table made in the form of a welding table, sliding, with recesses forming an opening in the center of the table when connecting these parts with the possibility of advancement through it into the borehole sections of the heat removal device.

Distinctive essential features of the claimed invention are:

- well completion to a depth with a bottom temperature of at least 600 ° C;

- the implementation of pipelines of the heat removal device, consisting of separate parts interconnected by hard bridges to form sections and connected to a steam boiler located in the bottom of the well;

- filling part of the well in the area of the steam boiler with the capture of its heating zone with waterproof material, and the rest of the well with rock raised to the surface while drilling the well in compliance with the order in the earth's crust at the drilling site.

The inventive device for mounting a heat-extraction system of a petrothermal power plant will allow for quick and reliable installation, ensuring the operability of the entire power plant.

Both of the claimed device is a petrothermal power plant and a device for mounting a heat-extraction system of a petrothermal power plant are connected by one inventive concept, ensuring the unity of the claimed invention.

The invention is illustrated by drawings, where figure 1 shows a General diagram of a petrothermal power plant; figure 2 - heat removal system in the bottom of the well; figure 3 - a device for mounting a heat removal system; figure 4 - installation diagram of the heat removal system.

The possibility of drilling wells with a depth significantly exceeding the depth of an ultra-deep well with a diameter of up to 4 and more meters, at high temperatures, was declared by the author of the present invention to obtain the patent of the Russian Federation No. 2372466, publ. November 10, 2009

The inventive petrothermal power plant contains a well 1, having a bottom 2 and a mouth 3, a heat removal system 4 lowered into the well, comprising a pipe for pumping water 5 with shutoff valves 6 and a steam pipe 7 with shutoff valves 8. The individual parts of the pipeline for pumping water 5 and steam pipe 7 are connected interconnected by rigid jumpers 9 with the formation of sections 10. The junction of the sections of the pipelines can be equipped with reinforcing belts 11, the junction of the sections of the pipeline for pumping water has a layer of protective coating Testing 12, the junction of the steam pipe sections is protected by a heat insulation layer 13. Pipelines 5 and 7 are connected to the steam boiler 14. Part of the well in the area of the steam boiler with the capture of its heating zone is filled with waterproof material 15, the rest of the well 16 is filled with rock raised to the surface when drilling a well in compliance with the order of its location in the earth's crust at the drilling site.

Ground equipment includes a storage tank 17, a separator 18, a turbine 19, a current generator 20, a capacitor 21, an energy block 22.

The inventive device for mounting the heat removal system of a petrothermal power plant includes a mounting tower 23 with a hydraulic lift 24 and a rod 25 with a mounting hook 26 suspended thereon, a sliding mounting (welding) table 27 with an opening 28, a unit with an electric motor and an oil pump 29.

Petrothermal power plant operates as follows. From the storage tank 17, water is supplied under pressure to a steam boiler 14 located in the bottomhole 2 of well 1 under pressure from the earth’s deep heat. Water is heated and, in the form of an overheated steam-water mixture, is supplied to the separator 18 through the steam line 7. After separation steam is supplied to the turbine 19, which rotates the current generator 20, water enters the storage tank 17. Exhaust steam is supplied to the condenser 21, the condensate formed also enters the storage tank 17. Electric current is supplied on power equipment in power unit 22.

The installation of the heat removal system of the petrothermal power plant is carried out using the inventive device for installation as follows.

At the wellhead 3 of the well 1, above which the mounting (welding) table 27 is installed in the extended state, a steam boiler 14 is lowered using a truck crane (not shown in the drawings) with the first parts of the pipeline 5 for water injection welded to it 5 and steam pipe 7 connected by hard jumpers 9, for which they hook the crane hook. As soon as the upper jumper reaches a level just above the welding table, the descent is stopped. Parts of the table are connected to the formations in the center of the opening 28 with pipelines passing through it. The connected parts of the sliding mounting table are bolted, and under the upper jumper connecting the piping sections, metal bars 30 are placed on the table. The jumper is lowered onto them, the mounting hook is disconnected from the jumper. The truck crane is being cleaned. Install a mounting tower 23 with a hydraulic jack 24 over the mouth. To the mounting hook 26 connected to the rod of the hydraulic cylinder 25, the next piping sections 10 connected by jumpers are connected until their lower ends come into contact with the upper ends of the pipelines of the first sections. The connected pipelines are welded, reinforcing belts are applied to the weld seam 11. The place of welding on the steam line is closed with a heat insulation layer 13, on the pipeline for water injection with a layer of protective coating 12. The welded part of the heat removal system is lifted, the metal bars are removed and the system is lowered back to the upper bridge. The entire sequence of securing the sections is repeated until the entire heat removal system is welded and the boiler is lowered into the bottom of the well. After the installation of the heat removal system, the well is filled with rock raised to the surface while drilling the well in compliance with the order of its location in the earth's crust at the drilling site, while part 15 of the well in the zone of the steam boiler with the capture of its heating zone is filled with waterproof material, for example, dense clay rocks.

Each jumper connecting the sections of pipelines and steam pipelines rests on backfill material and, thus, the weight of the heat removal system is evenly distributed over its entire height. At the same time, the stress of the pipes caused by stretching is significantly reduced, and the pressure of the pipes on the steam boiler is eliminated.

The claimed device with its inherent set of essential features will allow you to create a petrothermal power plant of high power, which allows you to extract the energy of the deep heat of the Earth, converting it into electricity, from wells of any depth, due to the reliable design of the heat removal system, consisting of interconnected separate parts of the pipeline and steam pipeline, connected in sections by means of rigid jumpers, which act as hooks during installation of the system, add rigidity to the system and play a supporting function tion in the buried well. Each jumper connecting the sections of pipelines and steam pipelines rests on backfill material and, thus, the weight of the heat removal system is evenly distributed over its entire height. At the same time, the stress of the pipes caused by stretching is significantly reduced, and the pressure of the pipes on the steam boiler is eliminated. The sectional design of the heat removal system facilitates its installation and descent into the well.

The claimed filling of part of the well with waterproof material allows you to protect the heating zone of the steam boiler from the penetration of water into it. Filling the rest of the well with rock raised to the surface while drilling the well in compliance with the order of its location in the earth’s crust at the drilling site will ensure the reliability of the system at relatively low cost, since the cost of filling material is eliminated and transportation of a large amount of material will be inexpensive.

The inventive device for mounting a heat-extraction system of a petrothermal power plant will allow quick and reliable installation of a heat-removing system consisting of a steam boiler and pipelines connected to it, lowering this system into the bottom of a well of any maximum depth with a temperature in the bottom that ensures the operability of the entire power plant.

Claims (5)

1. Petrothermal power plant containing a well drilled to a depth sufficient to capture the energy of the Earth's deep heat; a heat removal system located in the bottom of this well, containing two pipelines; ground equipment, including a separator, condenser, cooling and condensate return systems, characterized in that the well is drilled to a depth determined by a bottom temperature of at least 600 ° C, a steam boiler is installed in the bottom with heat-transfer system pipelines connected to it - a pipe for pumping water into a steam boiler and a steam line for removing steam from the steam boiler, arranged parallel to each other and consisting of separate parts, and parts of the pipeline for pumping water are connected to the parts of the steam the wire for the removal of steam by rigid bridges with the formation of sections, while part of the well in the area of the steam boiler with the capture of its heating zone is filled with waterproof material, the rest of the well is filled with rock raised to the surface while drilling the well in accordance with the order of its location in the earth's crust. 2. Petrothermal power plant according to claim 1, characterized in that the junction of the pipe sections is equipped with reinforcing belts. 3. Petrothermal power station according to claim 1, characterized in that the junction of the parts of the pipeline for pumping water further comprises a layer of protective coating. 4. Petrothermal power plant according to claim 1, characterized in that the junction of the parts of the steam pipe is protected by a layer of thermal insulation. 5. The mounting device of the heat-extraction system of the petrothermal power plant, made in accordance with claim 1, includes an assembly tower with a hydraulic lift, an assembly table made in the form of a welding table, the welding table is made sliding, with recesses forming in the center of the table when these parts are connected aperture, with the possibility of advancing through it into the well sections of the heat removal device.

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