阅读说明：本技术 一种天然气储气调峰的综合能源利用体系及储气调峰方法 (Comprehensive energy utilization system for natural gas storage and peak regulation and storage and peak regulation method ) 是由 梁正兴 王颂秋 王�华 苏文戟 于 2020-05-15 设计创作，主要内容包括：本发明涉及天然气能源利用领域,特别涉及一种天然气储气调峰的综合能源利用体系及储气调峰方法,体系包括依次管道连接的原油库、天然气炼制单元、天然气储气库和天然气利用单元；所述天然气利用单元包括化工生产设备、城市天然气管网和电力转换单元。与现有技术相比,本发明通过对天然气气源储存、利用的统一设计,综合管理,实现了原油、天然气、电能、热能等多种能源的交换以及综合利用,提高了能源利用效率,为分布式能源系统设计提供新方案。(The invention relates to the field of natural gas energy utilization, in particular to a comprehensive energy utilization system for natural gas storage and peak regulation and a storage and peak regulation method, wherein the system comprises a crude oil storage, a natural gas refining unit, a natural gas storage and a natural gas utilization unit which are sequentially connected through pipelines; the natural gas utilization unit comprises chemical production equipment, an urban natural gas pipe network and a power conversion unit. Compared with the prior art, the invention realizes the exchange and comprehensive utilization of various energy sources such as crude oil, natural gas, electric energy, heat energy and the like through the unified design and comprehensive management of the storage and utilization of the natural gas source, improves the energy utilization efficiency and provides a new scheme for the design of a distributed energy system.)

1. A comprehensive energy utilization system for natural gas storage and peak regulation is characterized in that: the system comprises a crude oil storage (1), a natural gas refining unit, a natural gas storage (14) and a natural gas utilization unit which are sequentially connected through pipelines; the natural gas utilization unit comprises chemical production equipment (13), an urban natural gas pipe network (20) and a power conversion unit; the natural gas refining unit comprises a crude oil refining unit and an organic matter secondary refining unit, the crude oil refining unit is respectively connected with a crude oil storage (1) and a natural gas storage (14) through pipelines, and the organic matter secondary refining unit is respectively connected with the crude oil refining unit and the natural gas storage (14) through pipelines.

2. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 1, characterized in that: the crude oil refining unit comprises distillation oil refining equipment (2), cracking oil refining equipment (3), reforming oil refining equipment (4) and first oil-gas multi-stage separation equipment (5), the crude oil reservoir (1) and the first oil-gas multi-stage separation equipment (5) are respectively connected with the distillation oil refining equipment (2), the cracking oil refining equipment (3) and the reforming oil refining equipment (4) through pipelines, and the first oil-gas multi-stage separation equipment (5) is connected with the natural gas storage reservoir (14) through a pipeline.

3. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 2, characterized in that: the organic matter secondary refining unit comprises a refined oil gas storage facility (7), an organic matter cracking device (8) and a second oil gas multistage separation device (9) which are sequentially connected through pipelines, the refined oil gas storage facility (7) is connected with the first oil gas multistage separation device (5) through a pipeline, and the second oil gas multistage separation device (9) is connected with the natural gas storage warehouse (14) through a pipeline.

4. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 1, characterized in that: the power conversion unit comprises a gas turbine (17) and a power grid (18).

5. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 1, characterized in that: the natural gas storage (14) is connected with a city natural gas pipe network (20) through a bidirectional pipeline.

6. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 1, characterized in that: natural gas storage storehouse (14) with be equipped with first natural gas valve station (11) on the pipeline between second oil gas multistage separation equipment (9), be equipped with second natural gas valve station (12) on the pipeline between natural gas storage storehouse (14) and chemical production equipment (13), natural gas storage storehouse (14) with be equipped with third natural gas valve station (15) on the pipeline between first oil gas multistage separation equipment (5), natural gas storage storehouse (14) with be equipped with fourth natural gas valve station (16) on the pipeline between gas turbine (17), natural gas storage storehouse (14) with be equipped with fifth natural gas valve station (19) on the pipeline between city natural gas pipe network (20).

7. The comprehensive energy utilization system for natural gas storage and peak shaving according to claim 1, characterized in that: the natural gas refining and storing system further comprises a central information processing center, and the central information processing center is in communication connection with the natural gas refining unit, the natural gas storing base (14) and the natural gas utilizing unit.

8. A gas storage peak regulation method is characterized by comprising the following steps:

step one, crude oil in a crude oil reservoir (1) is respectively conveyed to a distillation oil refining device (2), a cracking oil refining device (3) and a reforming oil refining device (4) for refining, refined products are separated in a first oil-gas multi-stage separation device (5), then separated methane is conveyed to a natural gas storage reservoir (14) after pressure regulation of a third natural gas gate station (15), and partial organic products which are not separated are conveyed to a refined oil-gas storage facility (7) for storage;

step two, organic matters in the refined oil gas storage facility (7) are sequentially conveyed to an organic matter cracking device (8) and a second oil gas multistage separation device (9) for cracking and separation, and methane generated by separation is conveyed to a natural gas storage warehouse (14) after being subjected to pressure regulation by a first natural gas gate station (11);

and step three, controlling the methane gas production rate of the distillation oil refining equipment (2), the cracking oil refining equipment (3), the reforming oil refining equipment (4) and the organic matter cracking equipment (8) according to the natural gas supply rate condition of the urban natural gas pipe network (20), and adjusting the gas supply conditions among the urban natural gas pipe network (20), the chemical production equipment (13), the gas turbine (17) and the natural gas storage pool (14), so that the natural gas yield, the utilization amount, the storage amount and the peak regulation function of the urban natural gas pipe network are realized.

9. The natural gas storage peak shaving method according to claim 8, characterized in that the third step is specifically: when the natural gas supply amount of the urban natural gas pipeline network (20) is sufficient, the first oil-gas multistage separation equipment (5), the second oil-gas multistage separation equipment (9) and the urban natural gas pipeline network (20) supply gas to the natural gas storage warehouse (14) normally, and meanwhile, the natural gas storage warehouse (14) is kept to be the normal gas supply amount of the chemical production equipment (13) and the gas turbine (17), so that the natural gas storage warehouse works under normal working conditions;

when the natural gas supply amount of the urban natural gas pipeline network (20) is insufficient, the natural gas storage reservoir (14) supplies gas to the urban natural gas pipeline network (20), the working conditions of the distillation oil refining equipment (2), the cracking oil refining equipment (3), the reforming oil refining equipment (4) and the organic matter cracking equipment (8) are changed, the gas supply amount of the first oil-gas multi-stage separation equipment (5) and the second oil-gas multi-stage separation equipment (9) to the natural gas storage reservoir (14) is increased, and the gas supply amount of the natural gas storage reservoir (14) to the chemical production equipment (13) and the gas turbine (17) is reduced;

when the natural gas supply amount of the urban natural gas pipe network (20) is excessive, the urban natural gas pipe network (20) supplies gas to the natural gas storage warehouse (14), the working conditions of the distillation oil refining equipment (2), the cracking oil refining equipment (3), the reforming oil refining equipment (4) and the organic matter cracking equipment (8) are adjusted according to needs, the gas supply amount of the first oil-gas multi-stage separation equipment (5) and the second oil-gas multi-stage separation equipment (9) to the natural gas storage warehouse (14) is reduced or not changed, and meanwhile, the gas supply amount of the natural gas storage warehouse (14) to the chemical production equipment (13) and the gas turbine (17) is increased.

Technical Field

The invention relates to the field of natural gas energy utilization, in particular to a comprehensive energy utilization system for natural gas storage and peak regulation and a storage and peak regulation method.

Background

Natural gas has become one of the main energy sources in China, and the safety, stability and continuity of the supply of the natural gas are related to the stateThe energy is safe. Because the external environment of the economic society has large variables, the whole situation of the China oil and gas supply safety has large uncertainty in the current and future long periods of time. In order to deal with the challenges of energy, environment, resources and climate change, the government of China is researching and promoting the revolution of four aspects of energy consumption, energy supply, energy technology and energy system, and provides a diversified, clean and efficient energy development strategy, and the development of low-carbon economy and the change of economic growth modes become necessary requirements for realizing scientific development of China. The natural gas distributed energy technology has high comprehensive energy efficiency (over 70 percent), CO₂The method has the characteristics of low emission, nearly zero pollution emission and benefit to peak shaving of a power grid and a natural gas pipe network, and becomes a strategic alternative technology for promoting energy production and consumption revolution in China.

From the view of natural gas source structure, according to the current natural gas consumption trend in China, the external dependence of natural gas is further improved, and the amount of natural gas consumed in China in 2018 is 2803 × 10⁸m³The dependence degree of the gas consumption in China exceeds 45 percent and tends to rise further, and the gas consumption in China city accounts for 50 percent of the total consumption by 2025, which is estimated to reach 2250 × 10⁸m³At the moment, if the external dependency degree exceeds 50%, domestic urban gas consumption needs foreign inlet gas to guarantee and is in an extremely unsafe state, and the supply guarantee of the urban gas has great influence on the stability of the civilian and the society, from the view of natural gas storage peak-shaving facilities, the working gas amount of the national underground gas storage is only about 3.0% of the natural gas consumption amount and is far lower than the world average level of 12% -15%, and as of 2018, China builds 26 seats of the underground gas storage, and the effective working gas amount 116 × 10⁸m³Difficult to reach 148 × 10 in 2020 of China⁸m³And (4) construction planning. The measurement and calculation results of the international gas alliance (IGU) show that when the external dependence of natural gas in one country reaches 30%, 12% of the consumption of the country is from underground gas storage, and the consumption of China is only 4.1% at present; in 2018, the natural gas import quantity in China exceeds that in Japan, the natural gas import quantity becomes the first natural gas import country in the whole world, and the dependence on the outside greatly rises45.3%, along with the continuous increase of urban population, the gradual improvement of natural gas pipe network facilities, the rapid development of distributed energy systems, the improvement of environmental pollution and the like, the demand of the domestic natural gas market is strongly increased, and the consumption of the Chinese natural gas is estimated to reach 3300 × 10 in 2020⁸m³In 2025, the technology is further promoted to 4500 × 10⁸m³Estimated to be 6000 × 10 in 2035⁸m³. The major push for the increase in natural gas demand will be city gas, which is expected to account for over 50% in 2025.

In general, the natural gas source is short, the external dependence is high, meanwhile, the matching of natural gas storage facilities is insufficient, finally, the natural gas consumption is increased year by year, and the market is gradually expanded. At present, the gas source of natural gas is mainly mined through a natural gas field and directly conveyed outwards through a pipeline, or the natural gas is liquefied and then the liquid natural gas is transported to a remote area. The natural gas source is single, the urban natural gas peak-regulating gas storage station is directly connected with the urban natural gas pipe network, the gas inlet of the peak-regulating gas storage station is obtained from the urban natural gas pipe network, and the gas outlet of the peak-regulating gas storage station is supplied to the urban natural gas pipe network.

Disclosure of Invention

In order to solve the technical problems, the invention provides a comprehensive energy utilization system for natural gas storage and peak regulation and a storage and peak regulation method, which solve the problems of how to realize dynamic balance of natural gas supply, reasonable distribution and utilization of natural gas and maximum natural gas utilization benefit.

The technical scheme adopted by the invention is as follows: a comprehensive energy utilization system for natural gas storage and peak regulation is characterized in that: the system comprises a crude oil storage, a natural gas refining unit, a natural gas storage and a natural gas utilization unit which are sequentially connected through pipelines; the natural gas utilization unit comprises chemical production equipment, an urban natural gas pipe network and a power conversion unit; the natural gas refining unit comprises a crude oil refining unit and an organic matter secondary refining unit, the crude oil refining unit is respectively connected with a crude oil storage and a natural gas storage through pipelines, and the organic matter secondary refining unit is respectively connected with the crude oil refining unit and the natural gas storage through pipelines. The effect of above scheme is according to the gas storage volume of natural gas storage storehouse, adjusts the operating mode of crude oil refining unit, organic matter secondary refining unit, chemical production equipment, city natural gas pipe network and power conversion unit, realizes different natural gas output and utilization quantity, realizes the storage of natural gas and the peak regulation function of city natural gas pipe network.

Preferably, the crude oil refining unit comprises distillation oil refining equipment, cracking oil refining equipment, reforming oil refining equipment and first oil-gas multi-stage separation equipment, the crude oil depot and the first oil-gas multi-stage separation equipment are respectively connected with the distillation oil refining equipment, the cracking oil refining equipment and the reforming oil refining equipment through pipelines, and the first oil-gas multi-stage separation equipment is connected with the natural gas storage depot through a pipeline. The scheme has the effects that crude oil is refined through distillation oil refining equipment, cracking oil refining equipment and reforming oil refining, gas rich in methane, such as topping gas, dry gas and the like, is collected, and is separated through multi-stage oil-gas separation equipment to serve as a natural gas source to convey qualified natural gas to a natural gas storage.

Preferably, the organic matter secondary refining unit comprises a refined oil gas storage facility, an organic matter cracking device and a second oil gas multistage separation device which are sequentially connected through pipelines, the refined oil gas storage facility is connected with the first oil gas multistage separation device through a pipeline, and the second oil gas multistage separation device is connected with the natural gas storage warehouse through a pipeline. The scheme has the effects that a proper organic matter product is conveyed to a refined oil gas storage facility, then the organic matter is cracked by an organic matter cracking device to obtain gases such as methane, and the gases are separated by an oil gas multistage separation device and then used as a natural gas source to convey qualified natural gas to a natural gas storage reservoir for storage.

Preferably, the power conversion unit comprises a gas turbine and a power grid. The scheme has the effects that when the gas turbine works, power is supplied to a power grid, the conversion from primary natural gas energy to secondary natural gas energy is realized, cold energy and hot energy can be provided for urban residents, and the distributed utilization of the energy is realized.

Preferably, the natural gas storage is connected with a city natural gas pipe network bidirectional pipeline. The effect of this scheme is through the two-way connection between gas storage storehouse and the pipe network, realizes the storage of natural gas and the peak regulation function of city natural gas pipe network.

Preferably, the natural gas storage with be equipped with first natural gas valve station on the pipeline between the second oil gas multistage separation equipment, be equipped with the natural gas valve station of second on the pipeline between natural gas storage and the chemical production equipment, the natural gas storage with be equipped with third natural gas valve station on the pipeline between the first oil gas multistage separation equipment, the natural gas storage with be equipped with fourth natural gas valve station on the pipeline between the gas turbine, the natural gas storage with be equipped with fifth natural gas valve station on the pipeline between the city natural gas pipe network. The effect of this scheme is under extreme condition, can cut off the connection of natural gas storage storehouse and first oil gas multistage separation equipment, second oil gas multistage separation equipment, natural gas utilization equipment, gas turbine and city natural gas pipe network respectively through each natural gas valve station.

Preferably, the system further comprises a central information processing center, and the central information processing center is in communication connection with the natural gas refining unit, the natural gas storage and the natural gas utilization unit. The scheme has the effects of receiving the gas consumption condition of natural gas of facilities at each place in real time, reasonably distributing and utilizing the natural gas and realizing the maximization of the utilization benefit of the natural gas.

The method for regulating the peak of natural gas storage is characterized by comprising the following steps:

step one, respectively conveying crude oil in a crude oil depot to distillation oil refining equipment, cracking oil refining equipment and reforming oil refining equipment for refining, separating refined products in first oil-gas multi-stage separation equipment, then conveying separated methane to a natural gas storage after pressure regulation of a third natural gas terminal, and conveying part of organic products which are not separated to a refined oil gas storage facility for storage;

step two, sequentially conveying the organic matters in the refined oil gas storage facility to an organic matter cracking device and a second oil gas multistage separation device for cracking and separation, and conveying the methane generated after separation into a natural gas storage after pressure regulation of a first natural gas gate station;

and step three, controlling the methane gas production rate of distillation oil refining equipment, cracking oil refining equipment, reforming oil refining equipment and organic matter cracking equipment according to the natural gas supply rate of the urban natural gas pipe network, and adjusting the gas supply conditions among the urban natural gas pipe network, chemical production equipment, a gas turbine and a natural gas storage reservoir, so that the natural gas yield, the utilization rate, the storage rate and the peak shaving function of the urban natural gas pipe network are realized.

Preferably, the third step is specifically: when the natural gas supply amount of the urban natural gas pipe network is sufficient, the first oil-gas multi-stage separation device, the second oil-gas multi-stage separation device and the urban natural gas pipe network all supply gas to the natural gas storage, and meanwhile, the natural gas storage is kept to be the normal gas supply amount of chemical production equipment and a gas turbine, so that the natural gas storage works under normal working conditions;

when the natural gas supply amount of the urban natural gas pipe network is insufficient, the natural gas storage reservoir supplies gas to the urban natural gas pipe network, the working conditions of distillation oil refining equipment, cracking oil refining equipment, reforming oil refining equipment and organic matter cracking equipment are changed, the gas supply amount of the first oil-gas multi-stage separation equipment and the second oil-gas multi-stage separation equipment to the natural gas storage reservoir is increased, and the gas supply amount of the natural gas storage reservoir to chemical production equipment and a gas turbine is reduced;

when the natural gas supply amount of the urban natural gas pipeline network is excessive, the urban natural gas pipeline network supplies gas to the natural gas storage, working conditions of the distillation oil refining equipment, the cracking oil refining equipment, the reforming oil refining equipment and the organic matter cracking equipment are adjusted according to needs, the gas supply amount of the first oil-gas multi-stage separation equipment and the second oil-gas multi-stage separation equipment to the natural gas storage is reduced or not changed, and meanwhile, the gas supply amount of the natural gas storage to chemical production equipment and a gas turbine is increased.

Compared with the prior art, the comprehensive energy utilization system for natural gas storage and peak regulation and the storage and peak regulation method have the following beneficial effects:

1. the invention utilizes methane generated in the crude oil refining process in the crude oil refining unit and methane generated in the organic matter cracking process in the organic matter secondary refining unit as the gas source of the natural gas storage. Meanwhile, the control of the methane yield is realized by adjusting the working conditions and raw materials in the processes of crude oil refining and chemical engineering, and the natural gas storage is scientifically supplied with gas;

2. the natural gas storage reservoir can provide natural gas for a gas turbine and chemical production equipment, and can realize the consumption of excessive natural gas. The gas turbine and the chemical production equipment can increase or reduce the consumption of natural gas by adjusting the working conditions of the gas turbine and the chemical production equipment, and match the natural gas stock in the natural gas storage.

3. The natural gas storage reservoir is connected with a natural gas source and natural gas utilization equipment, and is also connected with an urban natural gas pipeline network to participate in peak shaving work of urban natural gas; the natural gas is reasonably utilized through planned production and scientific distribution, and the reasonable utilization of the natural gas is realized.

4. The natural gas storage reservoir is in bidirectional connection with the urban natural gas pipeline, so that the natural gas storage reservoir can be used as a gas source to supply gas to the urban natural gas pipeline when the urban gas supply quantity is insufficient; meanwhile, when the city supplies sufficient gas, the natural gas pipeline can supply gas to the gas storage.

5. The invention realizes the exchange and comprehensive utilization of various energy sources such as crude oil, natural gas, electric energy, heat energy and the like by the unified design and comprehensive management of natural gas source storage and utilization, improves the energy utilization efficiency and provides a new scheme for the design of a distributed energy system.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.