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INVENTION
Russian Federation Patent RU2100588

PRODUCING ELECTRICITY IN shaftless UGLEGAZIFIKATSII METHOD AND / OR UNDERGROUND UGLESZHIGANII

PRODUCING ELECTRICITY IN shaftless UGLEGAZIFIKATSII METHOD AND / OR UNDERGROUND UGLESZHIGANII

Name of the inventor: Vasyuchkov YF .; BM Vorobiev
The name of the patentee: Vasyuchkov Yury Fedorovich; Boris Vorobyov
Address for correspondence:
Starting date of the patent: 1995.10.31

The invention relates to the mining industry and can be used for direct, in situ coal seams, producing electrical energy in the operation of coal field methane by co metanodrenazha and coal gasification in an array. It provides more efficient producing electricity and / or thermal energy by sharing the heat content of methane gas generator. Is achieved and increase the coefficient of thermal coal energy. Carry out the formation of coal-block panels. What is new is the fact that simultaneously with the gasification and / or combustion of coal on some panels at other nearby panels is carried out with suction degassing of methane. Thus obtained is mixed with methane gas generator before entering the gas turbine with an electric generator. coal panel array sequentially subjected first degassed and then gasification.

DESCRIPTION OF THE INVENTION

The invention relates to the mining industry and can be used to generate electricity. The method can be efficiently applied during operation with conditioned coal deposits and substandard inventory at a sufficiently high gas content (8 and 10 m 3 / t) of coal seams.

There are two ways to technologically related shaftless metanodrenazha by drilling wells from the surface and shaftless underground gasification of coal in the array. In the first case, the resulting methane from wells, is used as a gaseous fuel, and in the second gas generator for domestic purposes and for power generation of thermal power plants.

Disadvantages of known methods are the high costs and low productivity (high labor input and therefore high energy cost). Moreover, both the known method are characterized by low efficiency of obtaining and using the energy contained in coal beds, since in the first case, only the energy of the methane is used for drainage of methane, and in the second case is only the energy of methane, and in the second case is not used methane gas as an energy carrier. A gas generator is a low-calorie, which requires a large capital outlay.

The proposed method can be used in a wide range of geological conditions:

  • seams with energy coal;
  • coal seams with medium and high gas content;
  • layers capacity of 0.5 m and 0.4 above;
  • moderate watering of fields;
  • moderate disturbance field, especially undesirable disjunctive problems (discharges, emissions);
  • sufficiently dense strata of overburden;
  • embers of high-;
  • coals with a high sulfur content;
  • Lots of coal deposits; unintended health to processing by conventional methods (mines and quarries);
  • the remaining coal reserves at closed mines (safety pillars, unearned plots mine fields, areas of mine fields with substandard reserves).

Thus, the proposed combined method can be applied to the seams of medium and high gas content (methane), working out which, for whatever reasons, can not be produced by conventional methods due to insufficient capacity of coal seams, high sulfur, high ash content and others. in other words, this method can be used for testing off-balance coal, which currently can not be fulfilled by traditional methods with sufficient economic benefit.

A method of producing electrical energy at an underground coal gasification, which is closest to the applicant and, therefore, taken as a prototype, consisting in drilling wells into the coal array, applying blast and coal gasification in an array of suction productive gasification gas and supplying it to a gas turbine, resulting in an electrical generator.

The disadvantages of this method are the low efficiency (low completeness of extraction of energy from a gas-bearing strata and its use), the high cost of electricity production and low labor productivity, resulting in a high cost of electricity produced.

The invention aims to improve the efficiency of obtaining and using energy contained in coal seams conditioned and unconditioned stocks by increasing the fullness of extracting energy from coal-bearing strata, while reducing costs.

This is achieved in that two energy carrier used at the same time methane coal-bearing strata, and producer gas, which is an additional heat carrier; In addition, a combined cycle power generation, in which the combined gas (methane based gas and generator) and steam (heat from the working gas) turbine operating on a common generator.

The essence of the method lies in the organic and the technological unification of technology degassing of coal seams on the surface and underground coal gasification in an array. Both processes are carried out continuously and aligned in time; degassing coal gasification array precedes it.

Drainage of methane through wells drilled from the surface and then using these wells for coal gasification in an array. Thus, it is proposed shaftless technology is the use of energy, contained in coal and host rocks.

As a result, the degassing (the first stage) of coal is pumped methane array and the second array of coal gasification is carried out to obtain gas energy. Both methane and generating a product gas - are used in the mixture to generate power for a thermal power plant.

The first step of the integrated process of methane drainage is carried out through the surface of the borehole (vertical, inclined or horizontal) using metanootdachi stimulation by various methods (hydraulic fracturing, acidizing, etc.).

The second stage is conducted on the coal gasification method using a flow as possible to the previously drilled boreholes methano-catchment for ignition and for connecting sboyka channel for supplying and gasifying and blowing gas generator outlet.

Flow charts

The combined technology is formed of three basic technological solutions: metanootsos surface, underground uglegazifikatsiya and underground coal. Possible combinations of the combination are presented in the table.

Technological Scheme II is offered as a core, as the components of the basic technological solutions metanodrenazh surface and underground uglegazifikatsiya are each on their own in most tried out in industry. Therefore, the patent application shall be considered mainly for these combined technological scheme. The process parameters and sequence of activities is for the II combined technological scheme for use dipping seams (October 25 o) average power, and the whole complex of works is carried out only through wells drilled from the surface (shaftless method).

PRODUCING ELECTRICITY IN shaftless UGLEGAZIFIKATSII METHOD AND / OR UNDERGROUND UGLESZHIGANII

Schematic diagram of the cutting mine field and testing of the panels in the mine field is shown in FIG. 1. As the borders of panels taken along the strike coal pillars width of 3 to 5 m (in FIG. 1, not shown) or disjunctive disorders (discharges, reverse faults, shifts). panel width along strike can vary between 50 to 80 m, and in the fall of 100 150 m. These dimensions should be specified in each case depending on the specific geological conditions.

The initial period of development works in the floor / wing of the mine field is shown in FIG. 2. During this period, 1st panel degassed through wells drilled from the surface. Methane from coal strata and is sucked through the pipeline is used in a gas turbine to generate electricity. The first panel is fully prepared to suck methane by hydrofracturing or physico-chemical treatment of coal seam to intensify metanootdachi. After completion of the degassing 1st panel starts here preparation of underground gas generator, and the 2nd panel in the same manner metanootsos will be conducted.

Scheme preparation and testing of the panels during normal development work is shown in FIG. 3, where

1 blow hole gasified panel;

2 vapor wells (gas) gasified panel;

3 metanootvodyaschaya well degassed prepares the panels;

4 sboyka rozzhigovy initial channel;

5 colliding face sboyka rozzhigovogo channel;

6 borehole during drilling;

7 fire slaughter of underground gas generator;

8 slag, ash;

9 of the blow pipe;

10 gas exhaust pipe;

11-methane drainage pipeline;

12 main pipeline mixed gas (methane + gas). After degasification n-uglegazifikatsii panel 2 is produced in the process n-1 bar. Blowing in the slaughter of 7 fire fed by the blow hole 1 and the gasification gas is withdrawn through the borehole 2. The coal gasification process panel n-1 is produced by the traditional technology of continuous shaftless coal gasification in an array.

In the adjacent n-th panel is conducted through two inclined metanootsos metanootvodyaschie hole 3. It uses the traditional technology of methane drainage by slanted wells drilled from the surface. Drained methane enters the collecting main 11. The same goes methane pipeline of n + 1 panel, which produces education rozzhigovogo channel colliding face 5. The n + 2 panel drilled two inclined hole 6 coal seam.

In synchronous (time) n-degasification panel 1 and panel coal degassing n the time of completion of gasification panels n-1 ends coal degassing n-th panel; This ideal case will allow to have a panel in the gasification process and one adjacent panel during the degassing. Otherwise it is necessary to calculate the number of panels that are in simultaneous gasification and appropriate amount of degassed panels.

Metanootvodyaschie drainage hole 3 after completion may be used as a panel gasified and the vapor dutevoy- that will significantly reduce the costs of drilling and completion of wells. Thus, the underground gasification of coal in the array and the surface of the well through metanodrenazh tested and utilized on an industrial scale, which guarantees the successful application of the invention.

PRODUCING ELECTRICITY IN shaftless UGLEGAZIFIKATSII METHOD AND / OR UNDERGROUND UGLESZHIGANII

Process flow diagram of shaftless co-methane drainage and uglegazifikatsii in the array shown in FIG. 4, where

2 equipment for mechanical purification of gas;

3 equipment chemical cleaning gas;

4 gas turbine;

5 steam turbine;

6 generator;

7 exhauster;

8 Blower;

9 drilling rig (directional drilling);

10 original rozzhigovy channel (sboyka);

11 fire slaughter of underground gas generator;

12 colliding face rozzhigovogo channel;

13 of the blow hole;

14 venting wells;

15 metanootvodyaschaya well;

16 deviated wells for drilling in the formation period;

17 deviated wells prepares the panel;

18 bulkhead rear sight;

19 transmission line (to the consumer);

20 supply line blast from the blower;

21 pipe for the removal of the product gas;

Conduit 22 to the steam turbine;

23 Pipeline (methane + regenerative al);

24 cold water pipe;

25 pipe for the removal of the captured methane.

Scheme (. Figure 4) are: n-2 and degassed uglegazifitsirovana panel; n-1 bar in the gasification step; the n-th panel degassing stage (captured methane drainage); n + 1 rozzhigovogo channel to form a fire slaughter of underground gas generator; in the degassing period sboyka this allows to provide a deeper level of degassing panel; n + 2 in step panel drilling wells with two inclined surfaces.

Underground coal gasification in the n-1 is carried out according to traditional techniques. Blast from blower 20 through conduit 8 is supplied through the blowing hole 13 in firing slaughtering 11. The product gas is withdrawn via hole 14 and then through line 21 to heat exchanger 1. The cooled gas is mixed with the captured methane coming through the pipeline 25. Draining takes place simultaneously in methane n-th and n + 1 panels. The mixed gas (product gas + methane) passes first mechanical cleaning device 2, and then chemically cleaned in 3. Refined thus mixed gas is fed through the pipeline 23 to the gas turbine 4, which together with the steam turbine 5 drives the electric generator 6. Electricity alternator power line 19 is delivered to consumers. The chimney is carried by the gas turbine exhaust fan 7. Water supplied to the heat exchanger 1 through conduit 24. The vapor formed in the heat exchanger through conduit 22 is fed to the steam turbine 5.

The process is carried out by simultaneously metanootsosa and underground coal gasification in an array; the thus obtained mixed gas (methane + gas) with a high calorific value is used in the gas turbine. Heat extracted from the gas generator is used to generate steam, which is used in a steam turbine operating in tandem with a gas turbine. The principle of a two-stage processing of panels (Stage 1 metanootsos and 2nd stage of underground uglegazifikatsiya) will significantly improve the efficiency of electricity generation shaftless manner by the proposed technology; this creates an opportunity to significantly reduce the cost of electric power unit. In addition, the proposed technology for producing electricity is environmentally friendly. The social effect is the lack of people working underground (shaftless method).

CLAIM

1. A method of producing electricity with shaftless uglegazifikatsii and / or underground ugleszhiganii comprising a gasification and / or combustion of coal in the array and outlet gas generator to a gas turbine with an electric generator, characterized in that simultaneously with the gasification and / or combustion in Underground operated alone uchastkah- coal array panels, the panels at other nearby performed with suction degassing methane, with the resulting mixed with methane gas generator before entering the gas turbine and coal panel array sequentially subjected first degassed and then gasification.

2. The method of claim 1, wherein the heat generator gas obtained from cooling of the latter after the output of the array of coal is discharged and the steam turbine power generation is performed by using a combined cycle gas and steam turbine operating at a power generator.

3. A method according to claim 1, characterized in that the array of coal is drilled from the surface and used as a first suction degassing methane, and then for supplying a fire blast slaughtering and underground gas generator generating gas discharge.

4. The method according to claim 1, characterized in that the suck methane and gasification are subjected to substandard coal reserves to increase the degree of utilization of coal deposits as a source of non-renewable energy.

print version
Publication date 14.02.2007gg