Steam power generation system utilizing terrestrial heat

Abstract

The utility model discloses a steam power generation system utilizing terrestrial heat, which comprises a flash evaporator communicated with a mining well, a primary power generation assembly and a secondary power generation assembly, and the primary power generation assembly comprises a primary steam turbine generator unit and a primary condenser. The second-stage power generation assembly comprises a preheater, an evaporator, a second-stage steam turbine generator unit and a second-stage condenser which are sequentially connected end to end; a heat absorption pipe is inserted into the preheater in a penetrating mode, one end of the heat absorption pipe is communicated with the second-stage condenser, the other end of the heat absorption pipe is communicated with the evaporator, a heat exchange pipe is spirally wound on the heat absorption pipe, one end of the heat exchange pipe is communicated with the recharge well, and the other end of the heat exchange pipe is connected with a mixer. The first pipeline is communicated with the water outlet end of the first-stage condenser, the second pipeline is communicated with the water outlet end of the flash evaporator, and at least two groups of mixing units for enabling fluid to generate turbulent flow are arranged in the mixer.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the geothermal energy application technical field, specifically relates to a steam power generation system using geothermal energy. BACKGROUND

[0002] Geothermal steam, as an important renewable energy, is widely used in the world due to its clean and environmentally friendly characteristics.

[0003] The steam turbine generator set in the geothermal power generation system usually relies on high-pressure steam to generate electricity. When the steam pressure is reduced, using these low-pressure steam to drive the steam turbine generator set to generate electricity will greatly reduce its power generation efficiency. After the steam in the geothermal power generation system drives the steam turbine generator set to run, it will enter the condenser for condensation. At this time, there will be some low-pressure and low-heat steam that cannot complete condensation and cannot be delivered to the steam turbine generator set for power generation. Therefore, most of the time, it can only be emptied and treated, which not only wastes water resources in the geothermal power generation system, but also causes heat loss, affecting the overall system efficiency and resource utilization effect. SUMMARY

[0004] To solve the problems in the prior art, the utility model provides a steam power generation system using geothermal energy, which optimizes the processing process of geothermal steam and hot water, solves the efficiency problem in the prior art, and realizes the maximum utilization of resources and the overall improvement of system performance.

[0005] The utility model adopts the following technical solutions.

[0006] A steam power generation system using geothermal energy, comprising a flash evaporator connected to an exploitation well, wherein the gas outlet end of the flash evaporator is connected to a first power generation assembly, the water outlet end of the flash evaporator is connected to a second power generation assembly, the first power generation assembly comprises a first steam turbine generator set and a first condenser, and the second power generation assembly comprises a preheater, an evaporator, a second steam turbine generator set and a second condenser connected in sequence.

[0007] The heat absorption pipe is provided in the preheater, one end of the heat absorption pipe is connected to the second condenser, the other end of the heat absorption pipe is connected to the evaporator, the heat absorption pipe is spirally provided with a heat exchange pipe, one end of the heat exchange pipe is connected to the recharge well, the other end of the heat exchange pipe is connected to a mixer, the mixer is provided with a first pipe and a second pipe at the end away from the heat exchange pipe, the first pipe is connected to the water outlet end of the first condenser, the second pipe is connected to the water outlet end of the flash evaporator, and the mixer is provided with at least two groups of mixing units for generating turbulent flow of fluid.

[0008] Further, the water outlet end of the flash evaporator is connected to a flow valve, the first valve port of the flow valve is connected to the second pipe, and the second valve port of the flow valve is connected to the evaporator through a pipe.

[0009] Further, the second pipeline is communicated with the mixer through a flared pipe, and the first pipeline is arranged in the side wall of the mixer and is close to one end of the second pipeline.

[0010] Further, the heat absorption pipe is arranged with a heat absorption ring pipe in the preheater, and the heat absorption ring pipe is arranged in double helix with the heat exchange pipe.

[0011] Further, the low-boiling-point working medium is arranged in the secondary power generation assembly.

[0012] Further, the mixer is arranged with a shaft rod, the mixing unit is arranged on the shaft rod, each group of mixing units comprises two guide vanes which are arranged in central symmetry with the shaft rod as the symmetry axis, an included angle is arranged between the two guide vanes, and the arrangement directions of the guide vanes of adjacent two groups of mixing units are opposite.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. Energy utilization efficiency is improved: the overall layout is optimized, the waste heat of the primary power generation assembly is used to preheat the secondary power generation assembly, the heat of the low-pressure low-heat-value water vapor discharged from the primary condenser is recovered, water loss caused by steam discharge is reduced, energy utilization efficiency is improved, and the overall energy conversion capacity of the system is enhanced.

[0015] 2. Hot water recovery is optimized: the saturated liquid water discharged from the flash evaporator can be used as water for public facilities such as warm pools after heat exchange is completed in the evaporator, and can also be injected into a recharge well to supplement system water, thereby reducing resource waste. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The figure is a flow structure schematic diagram of the utility model;

[0017] Fig. 2 The figure is an internal structure schematic diagram of the preheater;

[0018] Fig. 3 The figure is a structure schematic diagram of the heat exchange pipe, the heat exchange ring pipe and the heat absorption pipe combination.

[0019] In the figure: 1, flash evaporator; 2, primary steam turbine generator set; 3, primary condenser; 4, flow valve; 5, mixer; 51, shaft rod; 52, guide vane; 53, flared pipe; 6, preheater; 61, heat exchange pipe; 62, heat absorption ring pipe; 63, heat absorption pipe; 7, secondary condenser; 8, secondary steam turbine generator set; 9, evaporator. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings in the utility model embodiments. The embodiments described in the application are only a part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by those skilled in the art without creative labor based on the spirit of the utility model belong to the protection scope of the utility model.

[0021] Embodiment 1

[0022] Please refer to Figs. 1-3 A steam power generation system using geothermal energy, comprising a flash evaporator 1 connected with a mining well, so as to draw high-temperature and high-pressure water in the mining well into the flash evaporator 1, to obtain saturated water vapor and saturated water, and the saturated water vapor and the saturated water are filtered separately, a first power generation assembly is connected to an air outlet end of the flash evaporator 1, and a second power generation assembly is connected to a water outlet end of the flash evaporator 1, the first power generation assembly comprises a first steam turbine generator set 2 and a first condenser 3, and the working medium in the first power generation assembly is steam flowing out of the air outlet end of the flash evaporator 1, so as to drive the first steam turbine generator set 2 to operate, and the working medium is condensed into liquid water after passing through the first condenser 3 and is discharged from a water outlet of the first condenser 3, the second power generation assembly comprises a preheater 6, an evaporator 9, a second steam turbine generator set 8 and a second condenser 7 connected in sequence, and the working medium in the second power generation assembly is a low-boiling-point working medium, which is used to absorb the temperature of the liquid water discharged from the first condenser 3 and the saturated water discharged from the water outlet end of the flash evaporator 1;

[0023] A cavity is formed in the preheater 6, and the heat absorption pipe 63 and the mixer 5 are installed in the cavity, the heat absorption pipe 63 is inserted through the preheater 6, one end of the heat absorption pipe 63 is communicated with the second condenser 7, and the other end is communicated with the evaporator 9, the low-boiling-point working medium condensed into liquid by the second condenser 7 is transported to the evaporator 9 through the heat absorption pipe 63, the preheater 6 preheats the low-boiling-point working medium in the heat absorption pipe 63, the heat absorption pipe 63 is spirally wound with a heat exchange pipe 61, one end of the heat exchange pipe 61 is communicated with a recharging well, and the other end is connected with the mixer 5, a first pipe and a second pipe are inserted into an end of the mixer 5 away from the heat exchange pipe 61, the first pipe is communicated with the water outlet end of the first condenser 3, and is used to receive the liquid water discharged from the first condenser 3 and the low-pressure and low-heat steam that is not condensed into liquid water, the second pipe is communicated with the water outlet end of the flash evaporator 1, and is used to receive the saturated liquid water discharged from the flash evaporator 1, at least two groups of mixing units for generating turbulent flow of fluid are arranged in the mixer 5, the mixer 5 is used to receive the saturated liquid water from the flash evaporator 1, the liquid water from the first condenser 3 and the steam that is not condensed into liquid water, and completely mixes and uniformly distributes the saturated liquid water, the steam and the liquid water.

[0024] The saturated liquid water discharged from the flash evaporator 1 is higher in temperature than the liquid water discharged from the primary condenser 3, and can directly enter the evaporator 9, in order to facilitate preheating according to the temperature of the liquid discharged from the primary condenser 3, in the embodiment, the water outlet of the flash evaporator 1 is communicated with a flow valve 4, a first valve port of the flow valve 4 is communicated with the second pipeline, and a second valve port of the flow valve 4 is communicated with the evaporator 9 through a pipeline.

[0025] In order to facilitate mixing, in the embodiment, the second pipeline is communicated with the mixer 5 through the flared pipe 53, and the first pipeline is inserted into one end of the side wall of the mixer 5 close to the second pipeline. The first pipeline can be obliquely inserted into the side wall of the mixer 5, and the first pipeline and the second pipeline are arranged at an acute angle.

[0026] In order to improve the heat exchange between the heat absorption pipe 63 and the heat exchange pipe 61, in the embodiment, the heat absorption pipe 63 is provided with a heat absorption ring pipe 62 in the preheater 6, and the heat absorption ring pipe 62 and the heat exchange pipe 61 are arranged in a double helix.

[0027] In the embodiment, the low-boiling-point working medium is in the secondary power generation assembly.

[0028] In the embodiment, the mixer 5 is provided with a shaft 51, and the mixing unit is arranged on the shaft 51. Each group of mixing units includes two center-symmetrically arranged guide vanes 52 with the shaft 51 as the symmetric axis, and an included angle is arranged between the two guide vanes 52. The guide vanes 52 of adjacent two mixing units are arranged in opposite directions. The guide vanes 52 in the plurality of mixing units can disturb the flow direction of the fluid, so that the fluid generates turbulent flow and vortex flow, is fully mixed and uniform, and the liquid water and the low-pressure low-heat steam are fully contacted and adsorbed in the mixing process.

[0029] The entire system can appropriately increase the pump and the exhaust valve.

[0030] The working principle of the utility model is as follows: high-temperature and high-pressure underground water is pumped from a mining well into a flash evaporator 1, steam enters a primary power generation assembly from the gas outlet end of the flash evaporator 1, drives a primary steam turbine generator set 2 to operate and generate power, and then enters a primary condenser 3 to condense into liquid water and enter a mixer 5. Part of the steam that has not condensed into liquid water also enters the mixer 5. By adjusting a flow valve 4, a part of the saturated liquid water discharged from the water outlet end of the flash evaporator 1 enters the mixer 5 through the second pipeline, mixes with the liquid water and steam discharged from the primary condenser 3, and makes the steam be completely adsorbed and then enter a heat exchange pipe 61 to preheat a low-boiling-point working medium in a heat absorption pipe 63. Finally, the low-boiling-point working medium is injected into a recharge well. Another part of the saturated liquid water discharged from the water outlet end of the flash evaporator 1 enters the evaporator 9 through a pipeline, completes heat exchange with the low-boiling-point working medium, and can be used as warm pool water or injected into the recharge well, so that the resource is maximized and the system performance is comprehensively improved.

[0031] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that the present application can be implemented in other embodiments without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0032] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A geothermal steam power generation system, comprising a flash evaporator (1) connected to a mining well, characterized in that: The flash evaporator (1) is connected to a primary power generation unit at its outlet and to a secondary power generation unit at its outlet. The primary power generation unit includes a primary steam turbine generator set (2) and a primary condenser (3). The secondary power generation unit includes a preheater (6), an evaporator (9), a secondary steam turbine generator set (8), and a secondary condenser (7) connected in sequence. A heat absorption tube (63) is inserted through the preheater (6). One end of the heat absorption tube (63) is connected to the secondary condenser (7), and the other end is connected to the evaporator (9). A heat exchange tube (61) is spirally wound on the heat absorption tube (63). One end of the heat exchange tube (61) is connected to the reinjection well, and the other end is connected to a mixer (5). A first pipe and a second pipe are inserted at the end of the mixer (5) away from the heat exchange tube (61). The first pipe is connected to the outlet of the primary condenser (3), and the second pipe is connected to the outlet of the flash evaporator (1). At least two sets of mixing units for generating turbulence in the fluid are provided in the mixer (5).

2. A geothermal steam power generation system according to claim 1, characterized in that: The outlet of the flash evaporator (1) is connected to a flow valve (4). The first valve port of the flow valve (4) is connected to a second pipe, and the second valve port of the flow valve (4) is connected to the evaporator (9) through a pipe.

3. A geothermal steam power generation system according to claim 1, characterized in that: The second pipe is connected to the mixer (5) through a flared pipe (53), and the first pipe is inserted into the side wall of the mixer (5) near the end of the second pipe.

4. A geothermal steam power generation system according to claim 1, characterized in that: The heat absorption tube (63) is located inside the preheater (6) and is provided with a heat absorption ring tube (62). The heat absorption ring tube (62) and the heat exchange tube (61) are arranged in a double spiral.

5. A geothermal steam power generation system according to claim 1, characterized in that: The secondary power generation component contains a low-boiling-point working fluid.

6. A geothermal steam power generation system according to claim 1, characterized in that: The mixer (5) is provided with a shaft (51), and the mixing unit is provided on the shaft (51). Each mixing unit includes two guide vanes (52) arranged symmetrically with the shaft (51) as the axis of symmetry. The two guide vanes (52) are provided with an included angle, and the guide vanes (52) of two adjacent mixing units are arranged in opposite directions.

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