A gas resource utilization balance control system and control method based on steel plant

Abstract

A gas resource utilization balance control system and control method based on a steel plant, belonging to the technical field of energy conservation and carbon reduction, solves the technical problem of gas resource waste in the existing gas pipeline network. The present invention is implemented through the following technical scheme: a gas resource utilization balance control system based on a steel plant, which is arranged in parallel with the existing energy consumption pipeline network system, and the existing energy consumption pipeline network system includes a number of user ends arranged in parallel and a gas release system arranged in parallel with the user ends; wherein: the gas resource utilization balance control system includes a gas system, a heat storage system, a power generation system and a power generation coupled with heat storage balance control device; the gas system includes a built-in boiler of a gas unit, and the heat storage system includes a heat storage device and a water supply pump. The present invention has the advantages of safety and practicality, reasonable design, environmental protection and high efficiency, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy conservation and carbon reduction, and in particular relates to a coal gas resource utilization balance control system and a control method based on a steel plant. Background Art

[0002] Steel is a process production industry, and the production process is accompanied by abundant gas resources. At present, with the development of steel energy-saving technology and the demand for energy conservation and consumption reduction of enterprises, the potential of gas resources is being tapped extensively, and the installation of self-provided gas-fired power generation units is increased to reduce the cost of purchasing electricity from outside the enterprise and reduce the cost of the enterprise. In addition, the gas resources of steel mills are also an important fuel component in the processing and production process of various production processes. Therefore, from the generation of blast furnace and steelmaking gas to the gas balance network of each user, the second function of the self-provided gas-fired generator set is to balance and adjust the gas to maximize the consumption of the gas.

[0003] However, in actual production, the generation of gas is stable, but the amount of gas consumed by users may fluctuate, which breaks the balance. The gas generators are unable to consume gas, causing the gas to be released, resulting in a waste of gas resources. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art and solve the technical problem of gas resource waste in the existing gas pipeline network, the present invention provides a gas resource utilization balance control system and control method based on a steel plant. The present invention is implemented through the following technical solutions.

[0005] A coal gas resource utilization balance control system based on a steel plant is arranged in parallel with an existing energy consumption pipe network system, wherein the existing energy consumption pipe network system comprises a plurality of user terminals arranged in parallel and a coal gas dispersing system arranged in parallel with the user terminals; Wherein: the gas resource utilization balance control system includes a gas system, a heat storage system, a power generation system and a power generation coupled with heat storage balance control device; The gas system includes a built-in boiler of the gas unit, and the heat storage system includes a heat storage device and a feed water supply pump; The outlet end of the main gas pipeline of the steel plant is connected to the gas inlet of the built-in boiler and the heat storage device of the gas unit through branch pipelines, and the steam outlet of the built-in boiler and the heat storage device of the gas unit is connected to the power generation system through connecting pipelines, and the power output end of the power generation system is connected to the power grid or the plant power system; The main gas network pipeline is provided with a system pressure gauge, the branch pipeline between the main gas network pipeline and the built-in boiler of the gas unit is provided with a gas system gas pressure gauge and a gas system gas flow control valve, and the connecting pipeline between the built-in boiler of the gas unit and the power generation system is provided with a gas system main steam shut-off valve, a gas system steam pressure gauge and a gas system steam thermometer; A gas pressure gauge of the heat storage system and a gas flow control valve of the heat storage system are provided on the branch pipeline between the main gas pipeline network and the heat storage device, and a main steam shut-off valve of the heat storage system, a steam pressure gauge of the heat storage system and a steam thermometer of the heat storage system are provided on the connecting pipeline between the heat storage device and the power generation system; the water supply device is connected to the water inlet of the water supply pump through a connecting water pipe, and the water outlet of the water supply pump is connected to the water supply port of the heat storage device through a connecting water pipe, and a water flow regulating valve is provided on the connecting water pipe between the water supply pump and the heat storage device; The balancing control device is electrically connected to the system pressure gauge, the gas system gas pressure gauge, the gas system gas flow control valve, the gas system main steam shut-off valve, the gas system steam pressure gauge, the gas system steam thermometer, the heat storage system gas pressure gauge, the heat storage system gas flow control valve, the heat storage system main steam shut-off valve, the heat storage system steam pressure gauge, the heat storage system steam thermometer, the feed water supply pump and the feed water flow regulating valve.

[0006] Furthermore, the heat storage device is a lava heat storage device, a ceramic heat storage device or a phase change composite heat storage device.

[0007] Furthermore, the power generation system includes a steam turbine and a generator.

[0008] A control method for a gas resource utilization balance control system comprises the following steps: 1) The system pressure gauge monitors the gas pressure value P in the main pipeline of the gas network, the gas pressure value P2 of the gas system and the gas pressure value P1 of the heat storage system in real time; 2) The balancing control device adjusts the gas flow control valve of the gas system and the gas flow control valve of the heat storage system according to the gas volume required by the gas system; If the gas supply in the main pipeline of the gas network is less than the gas required by the gas system, adjust the gas flow control valve of the gas system, open the main steam shut-off valve of the gas system, keep the main steam shut-off valve of the heat storage system closed, start the gas system, and supply steam to the power generation system through the gas system alone; If the gas supply in the main pipeline of the gas network is greater than the gas required by the gas system, adjust the gas flow control valve of the heat storage system, open the heat storage system, and store heat; If there is still surplus gas after the heat storage system is fully stored, the balance control device will transport the surplus gas to the original gas release system; 3) When the gas system alone supplies steam to the power generation system, if the power generation system output is greater than 100% load, the heat storage system stores heat by burning gas; When the gas system supplies steam to the power generation system alone, if the output of the power generation system is less than 100% load, the balance control device controls the feed water supply pump to start, and the feed water flow regulating valve controls the feed water amount of the heat storage system. The heat storage system releases heat and heats the feed water to produce steam. After the quality of the produced steam meets the standard, the main steam shut-off valve of the heat storage system opens to supply steam to the power generation system.

[0009] In order to make full use of the valuable secondary resource gas in the production and manufacturing of steel enterprises, the present invention constructs a new type of gas storage function in the existing gas pipeline network to achieve the economic characteristics of maximizing conversion efficiency, thus opening up a new path for the recycling of surplus energy resources of steel enterprises.

[0010] The present invention provides a new system that can coordinately consume surplus gas by coupling the existing gas-fired power generation unit of the steel plant with the newly added heat storage system, thereby reducing the emission of the enterprise gas network after the gas balance is broken; a real-time control method for surplus gas, power generation output, and heat storage and release based on energy informatization is established, and the three are coordinated to realize the transfer of gas consumption and usage time, thereby reducing the waste caused by the emission of gas resources.

[0011] Compared with the prior art, the present invention has the advantages of safety, practicality, reasonable design, environmental protection, high efficiency, and suitability for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the connection relationship of the present invention. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] like Figure 1 A gas resource utilization balance control system based on a steel plant is shown, which is arranged in parallel with an existing energy consumption pipe network system 1. The existing energy consumption pipe network system 1 includes a plurality of user terminals arranged in parallel and a gas release system arranged in parallel with the user terminals; the gas resource utilization balance control system 2 includes a gas system 3, a heat storage system 4, a power generation system 5 and a power generation coupled with heat storage balance control device; The gas system 3 includes a built-in boiler 6 of the gas unit, and the heat storage system 4 includes a heat storage device 7 and a water supply pump 8; the heat storage device 4 is a lava heat storage device, a ceramic heat storage device or a phase change composite heat storage device, and the heat storage system performs the consumption of coal gas to achieve deep coal gas balance; the power generation system 5 includes a steam turbine and a generator; The outlet end of the main gas pipeline 9 of the steel plant is connected to the gas inlet of the built-in boiler 6 of the gas unit and the heat storage device 7 through branch pipelines, and the steam outlets of the built-in boiler 6 of the gas unit and the heat storage device 7 are connected to the power generation system 5 through connecting pipelines, and the power output end of the power generation system 5 is connected to the power grid or the factory power system; The main gas network pipeline 9 is provided with a system pressure gauge 10, the branch pipeline between the main gas network pipeline 9 and the built-in boiler 6 of the gas unit is provided with a gas system gas pressure gauge 11 and a gas system gas flow control valve 12, and the connecting pipeline between the built-in boiler 6 of the gas unit and the power generation system 5 is provided with a gas system main steam shut-off valve 13, a gas system steam pressure gauge 14 and a gas system steam thermometer 15; A heat storage system gas pressure gauge 16 and a heat storage system gas flow control valve 17 are provided on the branch pipeline between the gas network main pipeline 9 and the heat storage device 7, and a heat storage system main steam shut-off valve 18, a heat storage system steam pressure gauge 19 and a heat storage system steam thermometer 2 are provided on the connecting pipeline between the heat storage device 7 and the power generation system 5; the water supply device is connected to the water inlet of the water supply pump 8 through a connecting water pipe, and the water outlet of the water supply pump 8 is connected to the water supply port of the heat storage device 7 through a connecting water pipe, and a water flow regulating valve 1 is provided on the connecting water pipe between the water supply pump 8 and the heat storage device 7; The balancing control device is electrically connected to the system pressure gauge 10, the gas system gas pressure gauge 11, the gas system gas flow control valve 12, the gas system main steam shut-off valve 13, the gas system steam pressure gauge 14, the gas system steam thermometer 15, the heat storage system gas pressure gauge 16, the heat storage system gas flow control valve 17, the heat storage system main steam shut-off valve 18, the heat storage system steam pressure gauge 19, the heat storage system steam thermometer 2, the feed water supply pump 8 and the feed water flow regulating valve 1 respectively.

[0015] A control method for a gas resource utilization balance control system comprises the following steps: 1) The system pressure gauge monitors the gas pressure value P in the main pipeline 9 of the gas network, the gas pressure value P2 of the gas system 3 and the gas pressure value P1 of the heat storage system 4 in real time; 2) The balancing control device adjusts the gas flow control valve 12 of the gas system and the gas flow control valve 17 of the heat storage system according to the gas volume required by the gas system 3; If the gas supply in the main gas network pipeline 9 is less than the gas required by the gas system 3, the gas system gas flow control valve 12 is adjusted, the main steam shut-off valve 13 of the gas system is opened, the main steam shut-off valve 18 of the heat storage system remains closed, the gas system 3 is started, and steam is supplied to the power generation system 5 alone through the gas system 3; If the gas supply in the main gas network pipeline 9 is greater than the gas required by the gas system 3, adjust the gas flow control valve 17 of the heat storage system, open the heat storage system 4, and store heat; If there is still surplus gas after the storage capacity of the heat storage system 4 is full, the balance control device will transport the surplus gas to the original gas release system; 3) When the gas system 3 supplies steam to the power generation system 5 alone, if the output of the power generation system 5 is greater than 100% load, the heat storage system 4 stores heat by burning coal gas; When the gas system 3 supplies steam to the power generation system 5 alone, if the output of the power generation system 5 is less than 100% load, the balance control device controls the water supply pump 8 to start, and the water supply flow regulating valve 1 controls the water supply amount of the heat storage system 4. The heat storage system 4 releases heat and heats the water supply to produce steam. After the quality of the produced steam meets the standard, the main steam shut-off valve 18 of the heat storage system is opened to supply steam to the power generation system 5.

[0016] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A gas resource utilization balance control system based on a steel plant, which is arranged in parallel with an existing energy consumption pipe network system, wherein the existing energy consumption pipe network system comprises a plurality of user terminals arranged in parallel and a gas dispersing system arranged in parallel with the user terminals; characterized in that: The coal gas resource utilization balance control system comprises a gas system (3), a heat storage system (4), a power generation system (5) and a power generation coupled with heat storage balance control device; The gas system (3) comprises a gas unit built-in boiler (6), and the heat storage system (4) comprises a heat storage device (7) and a feed water supply pump (8); The outlet end of the main gas pipeline (9) of the steel plant is connected to the gas inlet of the built-in boiler (6) of the gas unit and the heat storage device (7) through branch pipelines, and the steam outlets of the built-in boiler (6) of the gas unit and the heat storage device (7) are connected to the power generation system (5) through connecting pipelines, and the power output end of the power generation system (5) is connected to the power grid or the factory power system; A system pressure gauge (10) is provided on the main gas network pipeline (9), a gas system gas pressure gauge (11) and a gas system gas flow control valve (12) are provided on the branch pipeline between the main gas network pipeline (9) and the built-in boiler (6) of the gas generator set, and a gas system main steam shut-off valve (13), a gas system steam pressure gauge (14) and a gas system steam thermometer (15) are provided on the connecting pipeline between the built-in boiler (6) of the gas generator set and the power generation system (5); A heat storage system gas pressure gauge (16) and a heat storage system gas flow control valve (17) are provided on the branch pipeline between the gas network main pipeline (9) and the heat storage device (7); a heat storage system main steam shut-off valve (18), a heat storage system steam pressure gauge (19) and a heat storage system steam thermometer (2) are provided on the connecting pipeline between the heat storage device (7) and the power generation system (5); the water supply device is connected to the water inlet of the water supply pump (8) through a connecting water pipe, the water outlet of the water supply pump (8) is connected to the water supply port of the heat storage device (7) through a connecting water pipe, and a water flow regulating valve (1) is provided on the connecting water pipe between the water supply pump (8) and the heat storage device (7); The balancing control device is electrically connected to a system pressure gauge (10), a gas system gas pressure gauge (11), a gas system gas flow control valve (12), a gas system main steam shut-off valve (13), a gas system steam pressure gauge (14), a gas system steam thermometer (15), a heat storage system gas pressure gauge (16), a heat storage system gas flow control valve (17), a heat storage system main steam shut-off valve (18), a heat storage system steam pressure gauge (19), a heat storage system steam thermometer (2), a feed water supply pump (8), and a feed water flow regulating valve (1).

2. A gas resource utilization balance control system based on a steel plant according to claim 1, characterized in that: The heat storage device (4) is a lava heat storage device, a ceramic heat storage device or a phase change composite heat storage device.

3. The gas resource utilization balance control system based on a steel plant according to claim 1, characterized in that: The power generation system (5) comprises a steam turbine and a generator.

4. A control method for a gas resource utilization balance control system as claimed in claim 1, characterized in that: The following steps are involved: 1) The system pressure gauge monitors in real time the gas pressure value P in the main pipeline (9) of the gas network, the gas pressure value P2 of the gas system (3), and the gas pressure value P1 of the heat storage system (4); 2) The balancing control device adjusts the gas flow control valve (12) of the gas system and the gas flow control valve (17) of the heat storage system according to the gas volume required by the gas system (3); If the gas supply in the main gas network pipeline (9) is less than the gas required by the gas system (3), the gas system gas flow control valve (12) is adjusted, the main steam shut-off valve (13) of the gas system is opened, the main steam shut-off valve (18) of the heat storage system remains closed, the gas system (3) is started, and steam is supplied to the power generation system (5) alone through the gas system (3); If the gas supply in the main gas network pipeline (9) is greater than the gas required by the gas system (3), the gas flow control valve (17) of the heat storage system is adjusted to open the heat storage system (4) to perform heat storage; If there is still excess gas after the storage capacity of the heat storage system (4) is full, the balance control device will transport the excess gas to the original gas release system; 3) When the gas system (3) alone supplies steam to the power generation system (5), if the output of the power generation system (5) is greater than 100% load, the heat storage system (4) stores heat by burning coal gas; When the gas system (3) alone supplies steam to the power generation system (5), if the output of the power generation system (5) is less than 100% load, the balance control device controls the water supply pump (8) to start, and the water supply flow regulating valve (1) controls the water supply amount of the heat storage system (4). The heat storage system (4) releases heat and heats the water supply to produce steam. After the quality of the produced steam meets the standard, the main steam shut-off valve (18) of the heat storage system is opened to supply steam to the power generation system (5).

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