Energy gradient configuration and utilization method adopting differential pressure power generation and ejector combination

Abstract

The invention discloses an energy gradient configuration and utilization method adopting the combination of differential pressure power generation and an ejector, which comprises the following steps: configuring a front steam source, a pipeline valve, a differential pressure power generation device, a steam ejector, configuring a rear steam source and a steam using device, after power is generated in the differential pressure power generation device, the configured steam source I with lower pressure is discharged, and one part of the configured steam source enters the next process; and part of the pre-configured steam source enters the steam ejector through the pipeline valve and sucks the first configured steam source to form a new second configured steam source, the pressure of the second configured steam source is lower than that of the pre-configured steam source but higher than that of the first configured steam source, and then the second configured steam source enters the next procedure. Under the condition that a new steam source is not introduced, multiple steam sources are formed through differential pressure power generation and application of the steam ejector, the new steam source presents different gradients, and the problem that energy is wasted due to the fact that a gradient means is lacked for a simple or single steam source is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy gradient utilization and pressure difference power generation, and particularly to a method for utilizing energy gradient configuration by combining pressure difference power generation and an ejector. Background Art

[0002] Currently, people's utilization of energy has become more economical and refined. As a carrier of traditional energy, steam, how to utilize energy in a cascaded manner has become an important task and challenge. In many industries, in order to obtain stable heat energy, steam is used as a heat source to heat other working fluids in the process for various productions. The heat energy utilization of the steam system needs to make full use of the energy grade step by step, with high-energy used for high-level applications, low-energy used for low-level applications, and temperature and pressure matching. Energy cascaded utilization, comprehensive utilization, and refined division are used in different working scenarios. In order to more effectively utilize steam in a cascaded manner during production, most enterprises improve their equipment to further enhance their market competitiveness and energy conservation and emission reduction work.

[0003] There are many scenarios in industry that require the use of steam, but the steam source is always not fully configured according to the application scenarios. Even sometimes there is only one steam source provided for different application scenarios. Even for one application scenario, its requirements for the steam source also have a gradient span. For example, when steam heats air, the temperature of the air may range from 30°C to 200°C, and the corresponding steam saturation pressure at this temperature is approximately 0.004 MPa to 1.55 MPa. In actual industry, if there is no combination and optimization of other gradient energies, only steam sources above 1.55 MPa can be used. And if other application scenarios require higher steam pressure, steam supply equipment such as boilers will provide higher pressure steam sources. Although the phase change saturation enthalpy values of steam sources with different pressures are not very different, or rather, their heat release capabilities are comparable, their work capabilities are very different. When steam is divided into cascades, the pressure difference between different cascades has the ability to generate electricity and do work.

[0004] In practical applications, different steam sources are configured only when the energy gradient is particularly large. Especially for small and medium-sized industrial enterprises, which do not have the ability to invest in multiple steam sources themselves, using a single steam source for steam supply results in waste of the work ability of energy. The main reason is the lack of means to gradientize energy, especially the means to gradientize a single energy source. In today's world where energy is becoming increasingly precious and the dual-carbon goal is a long and arduous task, how to rationally utilize energy in a gradient manner is particularly important. How to solve the method of gradientizing a steam energy, especially a single-parameter steam energy, and apply it to actual engineering products has become very precious. Therefore, based on the above background, this technology proposes a solution and strives to achieve good regulation and cost-effectiveness. Summary of the Invention

[0005] The object of the present invention is to provide a method for utilizing the energy gradient configuration by combining pressure difference power generation and ejectors, so as to solve the problem of energy waste caused by the lack of gradient means for simple or single steam sources in the prior art.

[0006] The technical solution of the present invention is as follows: A method for utilizing the energy gradient configuration by combining pressure difference power generation and ejectors, characterized in that it includes a pre-configuration steam source, pipeline valves, a pressure difference power generation device, a steam ejector, a post-configuration steam source, and a steam-consuming device. Among them, the pre-configuration steam source enters the pressure difference power generation device through the pipeline valves, generates electricity in the pressure difference power generation device, and then forms a post-configuration steam source one with a lower pressure and discharges it. The post-configuration steam source one enters the next process; a part of the pre-configuration steam source enters the steam ejector through the pipeline valves, sucks in the post-configuration steam source one, and forms a new post-configuration steam source two. The pressure of the post-configuration steam source two is lower than that of the pre-configuration steam source but higher than that of the post-configuration steam source one, and then enters the next process.

[0007] The pre-configuration steam source is divided into many parts, and further through the pressure difference power generation device or the steam ejector or a combination of the two, further synthesize or form post-configuration steam sources with different parameters such as pressure after configuration.

[0008] Among the formed post-configuration steam sources with different parameters such as pressure after configuration, the steam ejector or the pressure difference power generation device or a combination of the two are used again to form a steam source with new pressure parameters, whether in series or parallel or series-parallel until the use requirements are met.

[0009] There are multiple pre-configuration steam sources. The multiple post-configuration steam sources formed by each pre-configuration steam source are combined with the post-configuration steam sources formed by other pre-configuration steam sources, through the steam ejector or the pressure difference power generation device or a combination of the two, until the energy gradient distribution and use requirements are met.

[0010] Generate electricity for a single steam through at least 1 pressure difference power generation device, and generate step-down steam. Then, by connecting at least one steam ejector in parallel, generate at least 3 different gradient steam sources including the original steam source. We call this the "basic fission unit" of the steam source. In practical applications, based on this basic fission unit, we can generate more types of steam sources according to the energy gradient requirements, which will be described in detail in combination with the accompanying drawings in the subsequent inventive concept.

[0011] The pipeline in the pipeline valves is an industrial steam or other-purpose pipeline and its accessory pipe fittings, and the valves are steam stop valves, various types of valves selected according to the working conditions such as pressure, temperature, and flow regulating valves.

[0012] The described pressure difference power generation includes axial turbines, radial turbines, screw expanders and other fluid prime movers that use the pressure difference of steam (gas) to perform work and generate electricity. The steam that has performed work and reduced pressure enters the next process to meet the use requirements of the next process. The steam source before configuration is the steam source in actual application. After the pressure reduction, it becomes steam with a lower pressure. Due to the singularity of the steam source at the application site, the steam flow rate meets the requirements of the subsequent process, that is, the energy is sufficient, but its gradient diversity (including temperature and pressure) does not meet the requirements of refined use. For example, although the high-pressure steam meets the heating requirements, during the heating process on the cold side, the high-temperature section of the corresponding heating equipment is satisfied, but the energy gradient of the low-temperature section is too high. The steam can be completely depressurized to do work and then used to heat the low-temperature section.

[0013] The present invention has the following beneficial effects compared with the prior art: The present invention provides a method for configuring and utilizing energy gradients by combining pressure difference power generation and ejectors. Without introducing a new steam source, by applying pressure difference power generation and steam ejectors, multiple steam sources can be formed. The new steam sources exhibit different gradients, thereby meeting the energy gradients that cannot be satisfied in actual applications due to the lack of multiple steam sources, and solving the problem of energy waste.

[0014] The method for configuring and utilizing energy gradients by combining pressure difference power generation and ejectors in the present invention uses pressure difference power generation to convert the excessive energy in the energy gradient into work and generate electricity, thereby differentiating the energy gradient into different gradients to serve different energy utilization gradients, and the excess gradient energy is used to generate electricity by doing work.

[0015] The present invention solves the problems of excessive use and investment in pressure difference power generation. The low-gradient steam generated by pressure difference power generation is recombined through ejectors. Since the investment in steam ejectors is much smaller than that of pressure difference power generation equipment, but still has the function of adjusting the steam pressure gradient, a good cost performance with multiple gradients and less investment is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 is a schematic diagram of a basic fission unit of the present invention.

[0019] Figure 3 is a schematic diagram of another basic fission unit of the present invention.

[0020] Figure 4 is a schematic structural diagram of a steam ejector. DETAILED DESCRIPTION OF THE INVENTION

[0021] A method for utilizing an energy gradient configuration using a combination of pressure difference power generation and an ejector.

[0022] Including: 1. Configuration of pre-steam source, 2.1-2.6, pipeline valves, 3. Pressure difference power generation device, 4.1-4.5, steam ejector, 5.1-5.6, configuration of post-steam source, 6.1-6.7, cascade steam equipment.

[0023] Usually, it is a single parameter pre-configuration steam source 1, wherein the pre-configuration steam source 1 enters the pressure difference power generation device 3 through the pipeline valve 2.1, and the steam is depressurized after generating power to become the post-configuration steam source 5.1; Another part of the pre-configuration steam source 1 is sucked into the post-configuration steam source 5.1 through the steam ejector 4.1 to form the post-configuration steam source 5.2. The pressure of 5.2 is lower than that of the pre-configuration steam source 1, but higher than that of the post-configuration steam source 5.1. Another part of the pre-configuration steam source 1 is sucked into the post-configuration steam source 5.2 through the steam ejector 4.2 to form the post-configuration steam source 5.3. The pressure of the post-configuration steam source 5.3 is lower than that of the pre-configuration steam source 1, but higher than that of the post-configuration steam source 5.2; Another part of the pre-configuration steam source 1 is sucked into the post-configuration steam source 5.3 through the steam ejector 4.3 to form the post-configuration steam source 5.4. The pressure of the post-configuration steam source 5.4 after configuration is lower than that of the pre-configuration steam source 1, but higher than that of the post-configuration steam source 5.3. The partially configured steam source 5.4 is sucked into the configured steam source 5.1 through the steam ejector 4.4 to form a configured steam source 5.5, the pressure of which is lower than that of the configured steam source 5.4 but higher than that of the configured steam source 5.1; Part of the rear steam source 5.4 is then sucked into the rear steam source 5.2 through the steam ejector 4.5 to form the rear steam source 5.6. The pressure of the rear steam source 5.6 is lower than that of 5.4 but higher than that of the rear steam source 5.2.

[0024] The basic composition and working mode of the steam ejector are as follows: the motive steam A enters from the steam chamber 11, and the pumped steam B is sucked into the suction chamber 13 through the motive steam nozzle 12. The steam is mixed at the diffuser inlet section 14 (mixing chamber), and ejected from the diffuser outlet section 15 to form mixed steam C. The motive steam A has the highest pressure, the pumped steam B has the lowest pressure, and the mixed steam C has a pressure between A and B. It should be noted that the pressure of C can be adjusted by controlling the flow of A and B, as well as other related means.

[0025] Steam-consuming equipment for different gradients refers to equipment that uses steam at different gradients. The most typical example is a heat exchanger, which uses steam to heat working fluids such as air and water. Due to the working principle of the steam ejector, the pressure of C can be adjusted by controlling the flow rates of steam A and B and other related means. Therefore, even if the pressure of another motive steam A1 is lower than that of A, and the pressure of the sucked steam B1 whose suction pressure is lower than or equal to B, the pressure of the newly generated mixed steam pressure C1 may still be higher than C. Therefore, the classification of subsequent steam-consuming equipment for different gradients is based on the parameters of the newly generated steam source in actuality, rather than the parameters of the motive steam or sucked steam before synthesis. The steam-consuming equipment for different gradients can adopt new supporting equipment or be added and modified based on the original equipment to utilize the method of the present invention for steam consumption in different gradients.

[0026] As described above, a single steam is used to generate electricity through at least 1 pressure difference power generation device, and the depressurized steam is generated. Then, by paralleling at least one steam ejector, steam sources with at least 3 different gradients including the original steam source are generated. Further, this method can adopt series connection, parallel connection or both to further use steam ejectors, pressure difference power generation devices or both to obtain a variety of new steam sources generated by more diverse configurations. These new steam sources and the steam sources before configuration can meet the steam gradient requirements of gradient steam-consuming equipment, and at the same time generate electricity or do work to achieve the purpose of energy gradient configuration and utilization, and the integration of power generation and work.

[0027] It should be noted that due to the adjustable output of the steam ejector, the cascade ranking of steam-consuming equipment is based on the parameters of the actually supplied steam source, rather than the parameters of the high-pressure or low-pressure steam before synthesis.

[0028] Furthermore, the steam is water vapor, or it can be other working fluids with the same or similar physical properties.

[0029] Furthermore, the ejector is a steam ejector, the flow rates of its motive steam and sucked steam are adjustable, and parameters such as the pressure of its discharged steam are adjustable. The steam ejector can also be an ejector of other working fluids with the same or similar physical properties.

[0030] Furthermore, in actual applications, the pressure difference power generation device is mostly an axial turbine, a mirror turbine, a screw expander, a steam turbine, etc. However, it is not limited to the several types of fluid prime movers listed.

[0031] Furthermore, the basic fission unit can be continuously combined and differentiated in the form of series connection, parallel connection or both series and parallel connection. After the diversity of steam sources, the steam ejector can be used for series and parallel configuration. They are not listed one by one here. No matter how complex the final diversity is, it ultimately originates from the basic fission unit.

[0032] Another situation is as follows: In the basic fission unit, before configuration, the steam source completely enters the parallel pressure difference power generation device and steam ejector through pipeline valves. After generating electricity in the pressure difference power generation device, the post-configuration steam source one with a lower pressure is completely sucked into the steam ejector and mixed with the remaining pre-configuration steam source after entering the pressure difference power generation device, forming the post-configuration steam source two. At this time, only the post-configuration steam source two is discharged, and its pressure is lower than the pre-configuration steam source but higher than the post-configuration steam source one, and then it enters the next process. Through this method, a new stepped new steam source is formed, and there is also a good equipment cost performance.

[0033] The above has described the implementation manner of a method for utilizing energy gradient configuration by combining pressure difference power generation and ejector of the present invention. The specific features such as shape, size and position of a method for utilizing energy gradient configuration by combining pressure difference power generation and ejector of the present invention can be specifically designed according to the functions of the features disclosed above, and these designs can all be achieved by those skilled in the art. Moreover, the disclosed technical features are not limited to the combinations with other disclosed features. Those skilled in the art can also make other combinations among the technical features according to the purpose of the present invention, taking the achievement of the purpose of the present invention as the criterion.

Claims

1. An energy gradient configuration and utilization method using a combination of pressure difference power generation and an ejector, characterized in that: It includes a pre-configuration steam source, a pipeline valve, a pressure difference power generation device, a steam ejector, a post-configuration steam source, and steam-using equipment, wherein the pre-configuration steam source enters the pressure difference power generation device through the pipeline valve, generates electricity in the pressure difference power generation device, forms a post-configuration steam source 1 with a lower pressure and is discharged, and the post-configuration steam source 1 enters the next process; a part of the pre-configuration steam source enters the steam ejector through the pipeline valve, and sucks in the post-configuration steam source 1 to form a new post-configuration steam source 2, and the post-configuration steam source 2 has a pressure lower than that of the pre-configuration steam source but higher than that of the post-configuration steam source 1, and then enters the next process.

2. The energy gradient configuration and utilization method using pressure difference power generation and ejector combination according to claim 1 is characterized by: The steam source before configuration is divided into many parts, which are further synthesized or formed into a new configured steam source with different pressure parameters through a pressure difference power generation device or a steam ejector or a combination of the two.

3. The energy gradient configuration and utilization method using pressure difference power generation and ejector combination according to claim 2 is characterized by: In the newly configured steam source with different pressure parameters, steam ejectors or pressure difference power generation devices or a combination of both are used again to form a steam source with new pressure parameters, whether in series or parallel or series and parallel until the use requirements are met.

4. The energy gradient configuration utilization method using pressure difference power generation and ejector combination according to claim 1, 2 or 3, characterized in that: There are multiple front-configuration steam sources, and multiple rear-configuration steam sources formed by each front-configuration steam source are combined with rear-configuration steam sources formed by other front-configuration steam sources, through steam ejectors or pressure difference power generation devices or a combination of the two, until the distribution and use requirements of the energy gradient are met.

5. The energy gradient configuration and utilization method using pressure difference power generation and ejector combination according to claim 1 is characterized by: The steam source before configuration enters the pressure difference power generation device through the pipeline valve, and forms a configured steam source 1 with lower pressure after generating electricity in the pressure difference power generation device and is discharged; in addition, all the remaining steam source before configuration enters the steam ejector through the pipeline valve, and absorbs the configured steam source 1 discharged from all the pressure difference power generation devices to form a new configured steam source 2. The pressure of the configured steam source 2 is lower than that of the steam source before configuration, but higher than that of the configured steam source 1, and then enters the next process.

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