A comprehensive energy supply system and method for waste pressure and waste heat utilization and energy storage

Abstract

The present invention relates to a waste heat utilization and energy storage integrated energy supply system and method, wherein a gas turbine provides high-temperature gas to a waste heat boiler so that the waste heat boiler generates medium-pressure steam and low-pressure steam; the medium-pressure steam generated by the waste heat boiler is divided into four parts for transportation, the first part is transported to a medium-pressure steam storage device, the second part is transported to the first medium-pressure steam user side, the third part is transported to a waste pressure power generation device, the waste pressure power generation device is connected to a waste heat power generation and storage device, and the fourth part is transported to a steam turbine; the low-pressure steam generated by the waste heat boiler is divided into four parts for transportation, the first part is transported to the first low-pressure steam user side, the second part is transported to a waste heat power generation system, the waste heat power generation system is connected to a waste heat power generation and storage device, the third part is transported to a waste heat cooling / heating device, and the fourth part is transported to a low-pressure steam storage device. The present application achieves safe and efficient energy supply by setting different low-pressure steam supply pipelines and medium-pressure steam transmission pipelines.

Description

Technical Field

[0001] The present invention relates to the field of energy, and in particular to a system and method for comprehensive energy supply by utilizing waste pressure and waste heat and storing energy. Background Art

[0002] Energy is one of the basic issues for the healthy development of my country's economy and society, and is an important indicator for measuring a country's comprehensive national strength and the degree of civilization. It is not only related to the improvement of people's living standards, but also the driving force for the development of the national economy. With the rapid growth of my country's economy, the problem of energy shortage has become more and more obvious. Due to the sharp increase in energy demand, the contradiction between energy supply and demand has been aroused, and the production and consumption of energy has also changed continuously. There is still a big gap between the comprehensive efficiency of energy utilization in my country and that in developed countries. One of the important reasons is that a lot of energy is not reasonably utilized as waste heat and is discharged into the atmosphere, resulting in a huge waste of energy. The gas-fired combined supply system with gas turbines as the prime mover is an energy system that can achieve substantial energy conservation and emission reduction. It outputs a variety of energy products such as electricity, cooling and heat to users nearby, which is of great strategic significance to the construction of a clean, low-carbon and sustainable energy system in the country.

[0003] The users of the integrated energy supply system are often fluctuating, and the types and quality of energy they need are different. Currently, there is a lack of an efficient energy supply system that can effectively solve the fluctuations in energy consumption and meet the needs of different types of energy consumption. For example, the patent with patent number 2016211549515 and application number 2019104646294 proposes several ways to utilize waste heat, but there are certain deficiencies and limitations in terms of utilization and adjustment methods. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a comprehensive energy supply system and method for waste pressure and waste heat utilization and energy storage, which can flexibly adjust the energy supply and quality of the comprehensive energy supply system, and at the same time achieve efficient energy supply and efficient utilization of energy when user demand fluctuates.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a waste pressure and waste heat utilization and energy storage integrated energy supply system, including a gas turbine and a waste heat boiler, the gas turbine and the waste heat boiler are connected, the gas turbine provides high-temperature gas to the waste heat boiler so that the waste heat boiler generates medium-pressure steam and low-pressure steam; it is characterized in that: the medium-pressure steam generated by the waste heat boiler is divided into four parts for transmission, the first part is transmitted to the medium-pressure steam storage device, the second part is transmitted to the first medium-pressure steam user side, the third part is transmitted to the waste pressure power generation device, and the medium-pressure steam after being utilized by the waste pressure power generation device is transmitted to the second medium-pressure steam user side, the waste pressure power generation device is connected to the waste pressure generator The medium-pressure steam is converted into low-pressure steam after being used by the steam turbine and is transported to the first low-pressure steam user side; the low-pressure steam generated by the waste heat boiler is divided into four for transportation, the first route is transported to the first low-pressure steam user side, the second route is transported to the waste heat power generation system and the low-pressure steam after being used by the waste heat power generation system is transported to the second low-pressure steam user side, the waste heat power generation system is connected with a waste heat power generation and storage device, the third route is transported to the waste heat cooling / heating device and the low-pressure steam after being used by the waste heat cooling / heating device is transported to the third low-pressure steam user side, and the fourth route is transported to the low-pressure steam storage device.

[0006] Preferably, during the transportation process, the medium-pressure steam generated by the waste heat boiler is first transported outward through a medium-pressure steam main transportation pipeline connected to the waste heat boiler, and the end of the medium-pressure steam main transportation pipeline is divided into four, so that the medium-pressure steam is transported in four ways; during the transportation process, the low-pressure steam generated by the waste heat boiler is first transported outward through a low-pressure steam main transportation pipeline connected to the waste heat boiler, and the end of the low-pressure steam main transportation pipeline is divided into four, so that the low-pressure steam is transported in four ways.

[0007] Preferably, the medium-pressure steam main transmission pipeline and the low-pressure steam main transmission pipeline are connected through a No. 1 bypass.

[0008] Preferably, the medium-pressure steam is sprayed with water for cooling before being transported to the first medium-pressure steam user side and the second medium-pressure steam user side, and the low-pressure steam is sprayed with water for cooling before being transported to the first low-pressure steam user side.

[0009] Preferably, the steam turbine is connected to the first low-pressure steam user side via pipeline 1, the excess pressure power generation device is connected to the second medium-pressure steam user side via pipeline 2, and pipeline 1 and pipeline 2 are connected via a No. 2 bypass.

[0010] The present invention also provides an energy supply method for a waste pressure and waste heat utilization and energy storage integrated energy supply system, which is characterized by:

[0011] Two different pressure levels of steam are generated through waste heat boilers: medium pressure steam and low pressure steam;

[0012] The utilization of medium-pressure steam is divided into four routes: the first route is transported to the medium-pressure steam storage device for storage, the second route is transported to the first medium-pressure steam user side after being adjusted to the appropriate pressure and temperature on the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling, the third route is transported to the residual pressure power generation device, and the medium-pressure steam after being utilized by the residual pressure power generation device is adjusted to the appropriate pressure and temperature on the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling, and then transported to the second medium-pressure steam user side, the residual pressure power generation device is connected to the residual pressure power generation and storage device, the fourth route is transported to the steam turbine, the medium-pressure steam is converted into low-pressure steam after being utilized by the steam turbine and transported to the first low-pressure steam user side;

[0013] The utilization of low-pressure steam is divided into four routes: the first route is transported to the first low-pressure steam user side, the second route is transported to the waste heat power generation system and the low-pressure steam after being utilized by the waste heat power generation system is transported to the second low-pressure steam user side, the waste heat power generation system is connected to a waste heat power generation storage device, the third route is transported to the waste heat cooling / heating device and the low-pressure steam after being utilized by the waste heat cooling / heating device is transported to the third low-pressure steam user side, and the fourth route is transported to the low-pressure steam storage device;

[0014] The medium-pressure steam storage device and the low-pressure steam storage device flexibly adjust the supply and storage of medium-pressure steam and low-pressure steam when the energy on the user side and the energy supply system do not match; the waste pressure power generation and storage device and the waste heat power generation and storage device flexibly adjust the balance between the user side demand and the energy supply system supply.

[0015] Compared with the prior art, the present invention has the following advantages and effects:

[0016] 1. By setting up different low-pressure steam supply pipelines and medium-pressure steam transmission pipelines, the energy supply is safe and efficient;

[0017] 2. By setting up waste pressure power generation equipment, waste heat power generation system, and waste heat cooling / heating equipment, the energy of steam can be efficiently utilized step by step, thus improving the energy efficiency of the comprehensive energy supply system;

[0018] 3. By setting up medium-pressure steam and low-pressure steam storage devices, when the energy on the user side and the energy supply system do not match, the supply and storage of low-pressure steam and high-pressure steam can be flexibly adjusted, so that the comprehensive energy supply system and the user are more matched, and the problem of unstable energy supply and efficient utilization caused by fluctuations on the user side can be effectively solved;

[0019] 4. By setting up waste pressure power generation and storage devices and waste heat power generation and storage devices, the balance between user demand and energy supply system supply can be flexibly adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0022] Explanation of the reference numerals in the accompanying drawings: gas turbine 1, waste heat boiler 2, medium-pressure steam storage device 3, waste pressure power generation device 4, steam turbine 5, first medium-pressure steam user side 6, second medium-pressure steam user side 7, waste pressure power generation and storage device 8, first low-pressure steam user side 9, waste heat power generation system 10, second low-pressure steam user side 11, waste heat cooling / heating device 12, third low-pressure steam user side 13, low-pressure steam storage device 14, waste heat power generation and storage device 15, medium-pressure steam main transmission pipeline 16, low-pressure steam main transmission pipeline 17, bypass No. 1 18, bypass No. 2 19. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0024] Example

[0025] See also Figure 1 .

[0026] This embodiment discloses a waste pressure and waste heat utilization and energy storage integrated energy supply system, including a gas turbine 1 and a waste heat boiler 2. The gas turbine 1 and the waste heat boiler 2 are connected, and the gas turbine 1 provides high-temperature gas to the waste heat boiler 2 so that the waste heat boiler 2 generates medium-pressure steam and low-pressure steam.

[0027] In this embodiment, during the transportation process, the medium-pressure steam generated by the waste heat boiler 2 is first transported outward by a medium-pressure steam main transportation pipeline 16 connected to the waste heat boiler 2, and the end of the medium-pressure steam main transportation pipeline 16 is divided into four, and the medium-pressure steam is transported in four ways; specifically, the first way is transported to the medium-pressure steam storage device 3, the second way is transported to the first medium-pressure steam user side 6, the third way is transported to the waste pressure power generation device 4 and the medium-pressure steam after being used by the waste pressure power generation device 4 is transported to the second medium-pressure steam user side 7, the waste pressure power generation device 4 is connected to the waste pressure power generation and storage device 8, and the fourth way is transported to the steam turbine 5, and the medium-pressure steam is converted into low-pressure steam after being used by the steam turbine 5 and is transported to the first low-pressure steam user side 9.

[0028] In this embodiment, during the transportation process, the low-pressure steam generated by the waste heat boiler 2 is first transported outward by a low-pressure steam main transportation pipeline 17 connected to the waste heat boiler 2, and the end of the low-pressure steam main transportation pipeline 17 is divided into four, and the low-pressure steam is transported in four routes; specifically, the first route is transported to the first low-pressure steam user side 9, the second route is transported to the waste heat power generation system 10, and the low-pressure steam after being utilized by the waste heat power generation system 10 is transported to the second low-pressure steam user side 11, the waste heat power generation system 10 is connected to a waste heat power generation storage device 15, the third route is transported to the waste heat cooling / heating device 12, and the low-pressure steam after being utilized by the waste heat cooling / heating device 12 is transported to the third low-pressure steam user side 13, and the fourth route is transported to the low-pressure steam storage device 14.

[0029] In this embodiment, the medium-pressure steam main transmission pipeline 16 and the low-pressure steam main transmission pipeline 17 are connected through a No. 1 bypass 18. The medium-pressure steam is sprayed with water for cooling before being transported to the first medium-pressure steam user side 6 and the second medium-pressure steam user side 7, and the low-pressure steam is sprayed with water for cooling before being transported to the first low-pressure steam user side 9. The steam turbine 5 is connected to the first low-pressure steam user side 9 through a pipeline 1, the residual pressure power generation device 4 is connected to the second medium-pressure steam user side 7 through a pipeline 2, and the pipelines 1 and 2 are connected through a No. 2 bypass 19.

[0030] In this embodiment, medium-pressure steam is flexibly utilized in stages, specifically: the medium-pressure steam energy is utilized in stages through the waste pressure power generation device to achieve the effect of efficient cascade utilization of energy; through the medium-pressure steam storage device, the supply and storage of medium-pressure steam can be flexibly adjusted when the energy on the user side and the energy supply system do not match.

[0031] In this embodiment, low-pressure steam is flexibly utilized in stages, specifically: low-grade low-pressure waste heat is converted into high-grade electrical energy through a waste heat power generation system; low-pressure steam energy is converted into cold / heat through a waste heat cooling / heating device to meet the user's cold / heat needs, thereby achieving energy conversion and matching supply; and low-pressure steam storage devices are used to flexibly adjust the supply and storage of low-pressure steam when the energy on the user side and the energy supply system do not match.

[0032] In this embodiment, the energy supply method of the waste pressure and waste heat utilization and energy storage integrated energy supply system is:

[0033] (1) Produce steam of two different pressure levels through the waste heat boiler 2: medium-pressure steam and low-pressure steam;

[0034] (2) The utilization of medium-pressure steam is divided into four routes: the first route is transported to the medium-pressure steam storage device 3 for storage; the second route is transported to the first medium-pressure steam user side 6 after being adjusted to a suitable pressure and temperature at the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling; the third route is transported to the residual pressure power generation device 4, and the medium-pressure steam after being utilized by the residual pressure power generation device 4 is transported to the second medium-pressure steam user side 7 after being adjusted to a suitable pressure and temperature at the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling; the residual pressure power generation device 4 is connected to a residual pressure power generation and storage device 8; the fourth route is transported to the steam turbine 5, and the medium-pressure steam is converted into low-pressure steam after being utilized by the steam turbine 5 and is transported to the first low-pressure steam user side 9;

[0035] (3) The utilization of low-pressure steam is divided into four routes: the first route is transported to the first low-pressure steam user side 9, the second route is transported to the waste heat power generation system 10 and the low-pressure steam after being utilized by the waste heat power generation system 10 is transported to the second low-pressure steam user side 11, the waste heat power generation system 10 is connected to the waste heat power generation storage device 15, the third route is transported to the waste heat cooling / heating device 12 and the low-pressure steam after being utilized by the waste heat cooling / heating device 12 is transported to the third low-pressure steam user side 13, and the fourth route is transported to the low-pressure steam storage device 14;

[0036] (4) When there is a mismatch between the energy on the user side and the energy supply system, the medium-pressure steam storage device 3 and the low-pressure steam storage device 14 flexibly adjust the supply and storage of medium-pressure steam and low-pressure steam; the waste pressure power generation and storage device 8 and the waste heat power generation and storage device 15 flexibly adjust the balance between the user side demand and the energy supply system supply.

[0037] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A waste heat utilization and energy storage integrated energy supply system, comprising a gas turbine (1) and a waste heat boiler (2), wherein the gas turbine (1) and the waste heat boiler (2) are connected, and the gas turbine (1) provides high-temperature gas to the waste heat boiler (2) so that the waste heat boiler (2) generates medium-pressure steam and low-pressure steam; characterized in that: The medium-pressure steam generated by the waste heat boiler (2) is divided into four parts for transmission. The first part is transmitted to the medium-pressure steam storage device (3), the second part is transmitted to the first medium-pressure steam user side (6), the third part is transmitted to the waste pressure power generation device (4), and the medium-pressure steam after being used by the waste pressure power generation device (4) is transmitted to the second medium-pressure steam user side (7), the waste pressure power generation device (4) is connected to the waste pressure power generation and storage device (8), and the fourth part is transmitted to the steam turbine (5), and the medium-pressure steam is converted into low-pressure steam after being used by the steam turbine (5) and is transmitted to the first low-pressure steam user side (9); The low-pressure steam generated by the waste heat boiler (2) is divided into four parts for transmission. The first part is transmitted to a first low-pressure steam user side (9). The second part is transmitted to a waste heat power generation system (10) and the low-pressure steam after being used by the waste heat power generation system (10) is transmitted to a second low-pressure steam user side (11). The waste heat power generation system (10) is connected to a waste heat power generation and storage device (15). The third part is transmitted to a waste heat cooling / heating device (12) and the low-pressure steam after being used by the waste heat cooling / heating device (12) is transmitted to a third low-pressure steam user side (13). The fourth part is transmitted to a low-pressure steam storage device (14). During the transportation process, the medium-pressure steam generated by the waste heat boiler (2) is first transported outwards through a medium-pressure steam main transport pipeline (16) connected to the waste heat boiler (2), and the end of the medium-pressure steam main transport pipeline (16) is divided into four parts, so that the medium-pressure steam is transported in four ways; During the transportation process, the low-pressure steam generated by the waste heat boiler (2) is firstly transported outwards through a low-pressure steam main transport pipeline (17) connected to the waste heat boiler (2), and the end of the low-pressure steam main transport pipeline (17) is divided into four parts, so that the low-pressure steam is transported in four ways; The medium-pressure steam main transmission pipeline (16) and the low-pressure steam main transmission pipeline (17) are connected via a No. 1 bypass (18); The steam turbine (5) is connected to the first low-pressure steam user side (9) via pipeline 1, the residual pressure power generation device (4) is connected to the second medium-pressure steam user side (7) via pipeline 2, and pipeline 1 and pipeline 2 are connected via a second bypass (19).

2. The waste pressure and waste heat utilization and energy storage integrated energy supply system according to claim 1 is characterized in that: The medium-pressure steam is sprayed with water for cooling before being transported to the first medium-pressure steam user side (6) and the second medium-pressure steam user side (7), and the low-pressure steam is sprayed with water for cooling before being transported to the first low-pressure steam user side (9).

3. An energy supply method for the waste pressure and waste heat utilization and energy storage integrated energy supply system as claimed in claim 1 or 2, characterized in that: generating steam of two different pressure levels through a waste heat boiler (2): medium-pressure steam and low-pressure steam; The utilization of the medium-pressure steam is divided into four routes: the first route is transported to the medium-pressure steam storage device (3) for storage; the second route is transported to the first medium-pressure steam user side (6) after being adjusted to a suitable pressure and temperature on the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling; the third route is transported to the residual pressure power generation device (4) and the medium-pressure steam after being utilized by the residual pressure power generation device (4) is transported to the second medium-pressure steam user side (7) after being adjusted to a suitable pressure and temperature on the medium-pressure steam user side by a pressure reducing valve and water spraying for cooling; the residual pressure power generation device (4) is connected to a residual pressure power generation and storage device (8); the fourth route is transported to the steam turbine (5), and the medium-pressure steam is converted into low-pressure steam after being utilized by the steam turbine (5) and is transported to the first low-pressure steam user side (9); The utilization of low-pressure steam is divided into four routes: the first route is transported to a first low-pressure steam user side (9), the second route is transported to a waste heat power generation system (10) and the low-pressure steam after being utilized by the waste heat power generation system (10) is transported to a second low-pressure steam user side (11), the waste heat power generation system (10) is connected to a waste heat power generation storage device (15), the third route is transported to a waste heat cooling / heating device (12) and the low-pressure steam after being utilized by the waste heat cooling / heating device (12) is transported to a third low-pressure steam user side (13), and the fourth route is transported to a low-pressure steam storage device (14); The medium-pressure steam storage device (3) and the low-pressure steam storage device (14) flexibly adjust the supply and storage of medium-pressure steam and low-pressure steam when the energy on the user side and the energy supply system do not match; the waste pressure power generation and storage device (8) and the waste heat power generation and storage device (15) flexibly adjust the balance between the demand on the user side and the supply of the energy supply system.

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