Factory power supply and distribution system

Abstract

The invention provides a factory power supply and distribution system which comprises a power utilization module, a power generation module, a power supply and distribution module and an intelligent power distribution module. The power supply and distribution module is electrically connected with an external power grid, the power generation module transmits electric energy to the power supply and distribution module, and the power supply and distribution module has a power distribution module for transmitting electric energy to the power utilization module. The power generation module comprises a coal gas power generation module and a waste heat and waste energy power generation module, a coal gas collecting pipeline and a coal gas conveying pipeline are arranged between the coal gas power generation module and the coal gas power generation module, and the coal gas conveying pipeline conveys from the coal gas power generation module to the coking power utilization module, the sintering power utilization module and the steelmaking power utilization module. According to the system, gas, solid and liquid waste heat energy can be recycled, meanwhile, the energy conversion cost in the process of converting coal gas into electric energy is effectively reduced, the input cost of the factory power distribution system is reduced, and meanwhile manpower consumption is reduced through intelligent power distribution management.

Description

Technical Field

[0001] The present invention relates to the technical field of factory power supply and distribution, and in particular to a factory power supply and distribution system. Background Art

[0002] The power distribution system of a steel plant is a high-voltage power distribution system, so it has high requirements for the stability of power distribution. Compared with ordinary power transmission systems, the power distribution system of a steel plant has more high-power and high-voltage electrical equipment. In addition to common electrical equipment, there are also high-power metallurgical electrical equipment such as oxygen generators and heating furnaces. In the power distribution design, the voltage needs to be designed in a hierarchical manner, and different power protection devices are set up. Different protection methods are adopted for different equipment. Such a design increases the workload of relevant staff and requires the addition of an electronic monitoring system to monitor the operation of each distribution system.

[0003] In addition, during the steel production process, the electricity consumption density of equipment is relatively concentrated, and the power load of the equipment started at the same time is concentrated. Since a large number of equipment need to be connected to the power supply to be used normally, many of which are large-scale industrial equipment, the energy consumption is even greater.

[0004] In the prior art, in order to make full use of energy, waste heat collection is used to collect waste heat from various processes in steel plants. However, due to the imperfections of different processes and energy conversion processes, various losses such as combustion losses, heat transfer losses, and transmission losses are easily generated during the collection process. In addition, the limitations on power generation equipment for the collected energy increase the cost of energy collection, making it impossible to truly achieve the goal of reducing enterprise costs by collecting and reusing energy.

[0005] Secondly, the safety requirements of electrical equipment are high. Since there are a large number of high-density, continuously working devices in the power supply equipment used in steel mills that are directly connected to high-temperature furnaces, rolling mills, ship unloaders and other equipment, once a sudden power outage occurs, the performance of the equipment will be affected or even damaged, which is undoubtedly a huge economic loss for the enterprise. The problem of power supply quality and load electromagnetic compatibility. Most of the large and medium-sized metallurgical equipment used in steel mills have nonlinear impact loads. Electric furnaces, ship unloaders, rolling mills, etc. will generate harmonic currents, voltage fluctuations, flicker, power factor and other power quality indicators during operation. Harmonic currents can cause cable overheating, equipment overvoltage, computer control errors, etc., and this current is very large. Due to the negative sequence current in the power supply and distribution system, it is easy to cause safety accidents. The power supply quality is incompatible with the load electromagnetics. Electrical equipment is susceptible to load impact during work, resulting in performance and durability being affected at the same time, and problems such as increased ground line loss and deviation of power data occur.

[0006] In addition, the existing power distribution system needs to be managed through intelligent upgrades to facilitate advance prediction by the grid control center and reduce the workload of power supply maintenance personnel. Summary of the invention

[0007] In view of this, the present invention aims to propose a factory power supply and distribution system, which can realize the recycling and utilization of gas, solid and liquid waste heat energy, effectively reduce the energy conversion cost in the process of converting gas into electrical energy, and reduce the investment cost of the power distribution system of the project. At the same time, it can realize information collection and fault prediction of power distribution, and can plan the work of power supply staff in advance, making the power supply work more orderly and reducing manpower consumption.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A factory power supply and distribution system comprises a power consumption module, a power generation module, and a power supply and distribution module;

[0010] The power supply and distribution module is electrically connected to the external power grid, the power generation module transmits electric energy to the power supply and distribution module, and the power supply and distribution module has a distribution module that transmits electric energy to the power consumption module;

[0011] The power modules include a coking power module, a sintering power module, a steelmaking power module, a rolling power module, and other power modules;

[0012] The power generation module includes a coal gas power generation module and a waste heat and waste energy power generation module. A coal gas collection pipeline and a coal gas transmission pipeline are arranged between the coal gas power generation module and the coal gas power generation module. The coal gas transmission pipeline transmits gas from the coal gas power generation module to the coking power module, the sintering power module, and the steelmaking power module.

[0013] The waste heat and waste energy power generation module includes a gas waste heat collection module and a liquid waste heat collection module, and a solid waste heat collection module arranged between the power consumption module;

[0014] It also includes a smart power distribution module for remote smart power distribution and monitoring;

[0015] The smart power distribution module is also provided with an environmental monitoring component, which includes an environmental controller, a water immersion sensor, a thermometer and a regulator;

[0016] The smart power distribution module is also provided with an electronic display, and the main control terminal is connected to the electronic display signal. The main control terminal can display the current parameters of the high-voltage end of the factory through the electronic display, so as to intuitively display the operation status of the smart substation power distribution system.

[0017] Furthermore, the coal gas power generation module includes a blast furnace gas power generation module and a boiler steam power generation module.

[0018] Furthermore, the gas waste heat collection module is used to collect steam and combustible gas in each process of the power module;

[0019] The liquid waste heat collection module collects molten iron and molten steel before final rolling into products;

[0020] The solid waste heat collection module collects the sintered ore and pelletized ore in the sintering power module, and collects the blast furnace slag and steel slag in the steelmaking power module.

[0021] Furthermore, the coal gas power generation module includes a filtering and dust removal device, a gearbox, a steam turbine, a generator, a gas turbine, a waste heat boiler and a condenser which are arranged in sequence;

[0022] The flue gas of the gas turbine is connected to the waste heat boiler, and the superheated steam in the waste heat boiler is connected to the air inlet of the steam turbine;

[0023] The steam in the steam turbine is communicated with the condenser through a steam channel, the condenser is used to condense the steam into cooling water, the cooling water is transported to the waste heat boiler, and the condenser is provided with a first connecting gas path for transporting cooling gas;

[0024] The gas collection pipeline is provided with a pressure part, the pressure part is connected to the gas delivery pipeline through a connecting pipeline, and the outlet of the pressure part is communicated with the inlet of the gas delivery pipeline.

[0025] The outlet of the pressure part is also connected to the coal gas power generation module, and a connecting pipeline is provided between the first connecting gas path and the pressure part.

[0026] Furthermore, the pressure part includes a pressure tank, the pressure tank is provided with an air inlet for inputting the collected coal gas, and an air outlet for flowing out the coal gas, the air inlet and the air outlet are arranged on the same side, and the air outlet is provided with a relief valve;

[0027] A pressure chamber is provided in the pressure tank, and the pressure chamber includes a working chamber and a pressure regulating chamber at one end away from the air inlet;

[0028] The pressure tank is provided with a connection port communicating with the first connecting gas path, and the connection port is correspondingly arranged in the pressure regulating chamber.

[0029] Furthermore, the pressure regulating chamber is provided with a flow port, and the flow port leads to the working chamber;

[0030] The flow port is provided with a first pressure regulating valve, and the connection port is provided with a second pressure regulating valve.

[0031] Furthermore, a pressure sensor is provided on the first connecting gas path.

[0032] Furthermore, the gas delivery pipeline further includes at least one first gas delivery path, and a second gas delivery path connected to the first gas delivery path;

[0033] The first gas delivery path is used to deliver the collected mixed coal gas, and the second gas delivery path is used to deliver compressed gas;

[0034] The first delivery gas path and the second delivery gas path are mixed to form a first mixed gas path;

[0035] The first mixed gas path is communicated with the air inlet.

[0036] Furthermore, the first gas delivery path and the second gas delivery path are mixed to form a second mixed gas path, and the second mixed gas path is connected to the steelmaking power module;

[0037] The first mixed gas path and the second mixed gas path are arranged in parallel.

[0038] Furthermore, a ring-shaped optical fiber current transformer is provided on the connection line between the power generation module and the power supply and distribution module;

[0039] The power supply and distribution module is provided with a compensation circuit inductively connected to the optical fiber current transformer.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] The factory power distribution system described in the present invention arranges a gas power generation module and a waste heat and waste energy power generation module in the power generation module, respectively collects the coal gas in the steelmaking power module, and then applies it to the coking power module, the sintering power module and the steelmaking power module through the gas transmission pipeline to provide part of the energy required for combustion, thereby avoiding the need to generate electricity after the coal gas is collected and then use the electric energy to provide energy for the power modules. Instead, the coal gas is directly collected and used, which effectively reduces the energy conversion cost in the process of converting the coal gas into electric energy and reduces the investment cost of the power distribution system of the project.

[0042] In addition, by setting up a gas waste heat collection module, a liquid waste heat collection module and a solid waste heat collection module in the waste heat and waste energy power generation module, comprehensive energy collection is achieved on the power consumption module, further improving energy utilization and realizing energy recycling.

[0043] In addition, after the mixed coal gas of the present application is recovered, the mixed coal gas enters the filtering and dust removal equipment for filtration, and then is pressurized by the pressure section set on the connecting pipeline and burned to be divided into two branches, one of which enters the gas turbine and generates high-temperature flue gas through combustion to drive the gas turbine to do work. The exhaust gas of the gas turbine enters the waste heat boiler to heat the feed water, and the steam is generated and sent to the steam turbine to do work, thereby achieving the purpose of combined cycle, in which the pressure section can pre-pressurize the mixed coal gas, so that the high-temperature flue gas has a greater pressure, reduce the working power of the gas compressor, or cancel the investment of the gas compressor if the requirements are met. The other branch is pressurized and then burned by the pressure section to provide part of the energy required for combustion in the coking power module, the sintering power module and the steelmaking power module, so as to facilitate more efficient use of the collected mixed coal gas.

[0044] At the same time, the present invention can realize information collection and fault prediction of power distribution through intelligent management, and can plan the work of power supply staff in advance, making the power supply work more orderly and reducing manpower consumption; and the power distribution system improves the efficiency of factory power distribution, reduces errors by directly collecting information, and improves the accuracy of power distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0046] Figure 1 A schematic diagram of a flow chart of a factory power supply and distribution system according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the process of using the mixed coal gas for the coal gas power generation module according to an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of the connection between the pressure unit and the power generation module, the coking power module, the sintering power module and the steelmaking power module according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the pressure unit according to an embodiment of the present invention;

[0050] Description of reference numerals:

[0051] 1. Power consumption module; 2. Power generation module; 3. Power supply and distribution module; 4. Pressure unit; 5. Connecting pipeline; 6. First connecting gas path; 7. Connecting pipeline; 8. Pressure sensor; 9. First transmission gas path; 10. Second transmission gas path; 11. First mixing gas path; 12. Second mixing gas path, 13. Ring-shaped fiber optic current transformer.

[0052] 401, air inlet; 402, air outlet; 403, overflow valve; 404, working chamber; 405, pressure regulating chamber; 406, connecting port; 407, flow port; 408, first pressure regulating valve; 409, second pressure regulating valve. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0054] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0057] The electricity consumption of traditional Chinese medicine processes in steel enterprises is 27% for energy system, 19% for iron making, 16% for hot rolling, 12% for cold rolling, 11% for steel making, and 15% for others. Among them, the energy system consumes the most electricity, and the main power-consuming equipment is concentrated on high-power motors in the oxygen production system, the blast system, and the air compressor system. The electricity consumption of cold rolling and hot rolling processes is mainly consumed by the main rolling mill. There are also a large number of high-power motors and large-capacity power-consuming equipment, such as electric furnaces, rolling mills, blowers, and conveyor belts.

[0058] The waste heat generated in the steelmaking process mainly includes slag waste heat, waste heat and cooling water waste heat. These waste heats are characterized by high temperature, large quantity and strong sustainability.

[0059]

[0060] According to the characteristics of waste heat generated in the above steelmaking process, such as Figure 1As shown, this embodiment relates to a factory power supply and distribution system, which includes a power consumption module 1, a power generation module 2, and a power supply and distribution module 3. The power supply and distribution module 3 is electrically connected to the external power grid, the power generation module 2 transmits electric energy to the power supply and distribution module 3, and the power supply and distribution module 3 has a distribution module for transmitting electric energy to the power consumption module 1.

[0061] Among them, the power module 1 includes a coking power module, a sintering power module, a steelmaking power module, a rolling power module, and other power modules. The power generation module 2 includes a gas power generation module and a waste heat and waste energy power generation module. A gas collection pipeline and a gas transmission pipeline are arranged between the gas power generation modules. The gas transmission pipeline is transported from the gas power generation module to the coking power module, the sintering power module, and the steelmaking power module. The waste heat and waste energy power generation module includes a gas collection waste heat module and a liquid collection waste heat module, as well as a solid collection waste heat module, which are arranged between the power module 1.

[0062] The system also includes an intelligent power distribution module for remote intelligent power distribution and monitoring. The intelligent power distribution module is also provided with an environmental monitoring component, which includes an environmental controller, a water immersion sensor, a thermometer and a regulator. The present invention can realize information collection and fault prediction of power distribution through intelligent management, and can plan the work of power supply staff in advance, making the power supply work more orderly and reducing manpower consumption. In addition, the power distribution system improves the efficiency of factory power distribution, reduces errors by directly collecting information, and improves the accuracy of power distribution.

[0063] The smart power distribution module includes an integrated intelligent transformer and a power distribution component. The integrated intelligent transformer includes a high-voltage receiving device and a transformer component. The high-voltage receiving device is connected to the power distribution component based on the transformer component.

[0064] The smart power distribution module is also provided with an electronic display, and the main control terminal is connected to the electronic display signal. The main control terminal can display the current parameters of the high-voltage end of the factory through the electronic display, so as to intuitively display the operation status of the smart substation power distribution system.

[0065] The factory power distribution system described in this embodiment sets a gas power generation module and a waste heat and waste energy power generation module in the power generation module 2, respectively collects the coal gas in the steelmaking power module, and then uses it in the coking power module, sintering power module and steelmaking power module through the gas transmission pipeline to provide part of the energy required for combustion, thereby avoiding the need to generate electricity after the coal gas is collected and then use the electric energy to provide energy for the power module 1. Instead, the coal gas is directly collected and used, which effectively reduces the energy conversion cost in the process of converting coal gas into electric energy and reduces the investment cost of the power distribution system of the project.

[0066] In addition, by setting up the gas waste heat collection module, the liquid waste heat collection module and the solid waste heat collection module in the waste heat and waste energy power generation module, all-round energy collection is achieved on the power consumption module 1, further improving the energy utilization rate and realizing the recycling of energy.

[0067] In general, air recovery is preheated and recovered through heat pipe heat exchangers or ceramic heat exchangers, and the heat in the exhaust gas from processes such as sintering machines, steel rolling heating furnaces, blast furnace hot blast furnaces, dry coke quenching, and coke ovens is transferred to the heat exchange medium, and then further converted into electrical energy or thermal energy. The exhaust gas in the gas turbine enters the waste heat boiler to heat the feed water, generating steam that is sent to the steam turbine to do work. Liquid recovery uses heat pump technology to extract the heat from the cooling water, and then further converts it into electrical energy or thermal energy.

[0068] As a preferred implementation mode, Figure 1 As shown, the coal gas power generation module includes a blast furnace gas power generation module and a boiler steam power generation module. By combining the blast furnace gas module and the boiler steam power generation module, both gas energy and steam energy can be collected, and the steam generated by gas combustion can be used for boiler steam power generation.

[0069] Preferably, still as Figure 1 As shown, the gas waste heat collection module is used to collect steam and combustible gas in each process of the power module. The liquid waste heat collection module collects molten iron and molten steel before final rolling. The solid waste heat collection module collects sintered ore and pelletized ore in the sintering power module, as well as blast furnace slag and steel slag in the steelmaking power module.

[0070] Furthermore, combined with Figure 1 and Figure 2 As shown, the coal gas power generation module includes a filtering and dust removal device, a gearbox, a steam turbine, a generator, a gas turbine, a waste heat boiler and a condenser arranged in sequence. The flue gas of the gas turbine is connected to the waste heat boiler, and the superheated steam in the waste heat boiler is connected to the air inlet of the steam turbine.

[0071] The steam in the steam turbine is connected to the condenser through a steam channel. The condenser is used to condense the steam into cooling water, which is then transported to the waste heat boiler. The condenser is provided with a first connecting gas path 6 for transporting cooling gas.

[0072] A pressure part 4 is provided on the gas collection pipeline, and the pressure part 4 is connected to the gas transmission pipeline through a connecting pipeline 5. The outlet of the pressure part 4 is connected to the inlet of the gas transmission pipeline. The outlet of the pressure part 4 is also connected to the gas power generation module. A connecting pipeline 7 is provided between the first connecting gas path 6 and the pressure part 4.

[0073] In this embodiment, the mixed coal gas enters the filtering and dust removal equipment for filtration, and then is combusted after being pressurized by the pressure section 4 set on the connecting pipeline 5, and is divided into two branches, one of which enters the gas turbine, generates high-temperature flue gas through combustion, and drives the gas turbine to work. The exhaust gas of the gas turbine enters the waste heat boiler to heat the feed water, and the steam is generated and sent to the steam turbine to work, thereby achieving the purpose of combined cycle, wherein the pressure section 4 can pre-pressurize the mixed coal gas, so that the high-temperature flue gas has a greater pressure, reduce the working power of the gas compressor, or cancel the investment of the gas compressor if the requirements are met. The other branch is combusted after being pressurized by the pressure section 4 to provide part of the energy required for combustion in the coking power module, the sintering power module, and the steelmaking power module, so as to facilitate more effective use of the collected mixed coal gas.

[0074] Preferably, combined Figure 1 and Figure 3 As shown, the pressure part 4 includes a pressure tank, which is provided with an air inlet 401 for inputting the collected gas and an air outlet 402 for the gas to flow out. The air inlet 401 and the air outlet 402 are arranged on the same side, and the air outlet 402 is provided with a relief valve 403. A pressure chamber is provided in the pressure tank, and the pressure chamber includes a working chamber 404 and a pressure regulating chamber 405 at one end away from the air inlet 401. The pressure tank is provided with a connection port 406 connected with the first connecting gas path 6, and the connection port 406 is correspondingly arranged in the pressure regulating chamber 405.

[0075] like Figures 1 to 3 As shown, by setting up the first connecting gas line 6, the cooled gas in the condenser can be passed into the pressure tank, and the pressure of the pressure regulating chamber 405 can be adjusted through the first connecting gas line 6 to meet the needs of blast furnace gas power generation and the energy needs of the corresponding processes in the power module 1.

[0076] As Figure 3 As shown in , a relief valve 403 is provided at the gas outlet 402, which can ensure that the gas pressure at the output port of the pressure tank is stable, and the gas in the gas output pipeline and the connecting pipeline 5 is kept at the same pressure value, thereby improving the gas use effect. By also providing the pressure part 4 as a pressure tank, the continuously collected gas can be collected and cached, so as to ensure uniform output during the subsequent gas use process and ensure the gas use effect.

[0077] like Figure 3 and Figure 4 As shown, the pressure regulating chamber 405 is provided with a flow port 407, and the flow port 407 leads to the working chamber 404. The flow port 407 is provided with a first pressure regulating valve 408, and the connecting port 406 is provided with a second pressure regulating valve 409.

[0078] Preferably, if Figure 3 and Figure 4As shown, a pressure sensor 8 is provided on the first connecting gas path 6. By setting the pressure sensor 8, the pressure value of the first connecting gas path 6 can be monitored at all times, so as to control the pressure value in the pressure regulating chamber 405. By setting the connecting port 406, the pressure in the pressure regulating chamber 405 and the pressure in the working chamber 404 are gradually equalized, so as to adjust the gas pressure of the gas outlet 402 of the pressure tank.

[0079] In addition, by providing a first pressure regulating valve 408 at the flow port 407, the gas flow rate entering the first connecting gas path 6 can be controlled to ensure the stable entry of the cooling gas. And by providing a second pressure regulating valve 409 at the connecting port 406, the gas flow rate between the pressure regulating chamber 405 and the working chamber 404 is adjusted, thereby ensuring that the gas in the working chamber 404 gradually becomes stable when the pressure is adjusted.

[0080] Preferably, if Figure 3 As shown, the gas delivery pipeline of this embodiment also includes at least one first delivery gas path 9, and a second delivery gas path 10 connected to the first delivery gas path 9. The first delivery gas path 9 is used to deliver the collected mixed gas, and the second delivery gas path 10 is used to deliver compressed gas. The first delivery gas path 9 and the second delivery gas path 10 are mixed to form a first mixed gas path 11. The first mixed gas path 11 is connected to the air inlet 401.

[0081] Still Figure 3 As shown, the first gas delivery path 9 of this embodiment is the collected coal gas. In this embodiment, multiple second gas delivery paths 10 are arranged to use compressed air or combustion-supporting gas. By mixing the coal gas with compressed air or combustion-supporting gas, the mixed coal gas can be burned more completely in the subsequent combustion process, thereby improving the utilization of the coal gas combustion application.

[0082] Furthermore, the first gas delivery path 9 and the second gas delivery path 10 are mixed to form a second mixed gas path 12, and the second mixed gas path 12 is connected to the steelmaking power module 1. The first mixed gas path 11 and the second mixed gas path 12 are arranged in parallel. In this embodiment, by setting the second mixed gas path 12, the second mixed gas path 12 directly leads to the steelmaking power module without passing through the pressure tank, which meets the production requirements of the steelmaking module.

[0083] As Figure 3 As shown in the figure, the coal gas collected in the steelmaking step of this embodiment is also provided with a shutoff valve and a pressure regulating valve on the pipeline for conveying coal gas in the first gas conveying path 9. A shutoff valve and a flow regulating valve are provided on the second gas conveying path 10. In addition, a control box is also provided on the first gas conveying path 9, and the opening and closing of the shutoff valve and the flow regulating valve are controlled by the control box to prevent gas leakage after flameout.

[0084] In addition, Figure 3As shown, the air inlet 401 of the pressure tank is a mixed gas path of the first gas delivery path 9 and the second gas delivery path 10. The gas path contains a mixed gas of coal gas and compressed air. A one-way valve is arranged on the gas path to prevent the gas in the pressure tank from flowing back into the first gas delivery path 9 and the second gas delivery path 10. Pressure regulating valves are respectively arranged on the gas paths from the outlet of the pressure tank to the coking power module, the sintering power module, and the power generation module 2 to meet the pressure requirements of the mixed gas in different processes. Each valve body in this embodiment is electrically connected to the above-mentioned control box. The control box in this embodiment is, for example, a PLC control system in the prior art. For details, please refer to the prior art and will not be repeated here.

[0085] Existing technology uses molten salt heat storage system to collect intermittent and periodic waste heat, improve the parameter value and stability of recovered steam, thereby improving the efficiency and leading performance of waste heat power generation. It can also be coupled with gas generator sets, combined with peak and valley electricity prices, energy digitization, production power load control and other measures to increase the self-generation rate and enhance the regulation capacity of the energy system. In addition to gas units, heat storage technology can also be used for waste heat power generation peak regulation, such as dry quenching heat storage peak regulation system and sintering waste heat power generation heat storage peak regulation system. By configuring the heat storage peak regulation system, it is possible to stabilize the waste heat and waste energy with large fluctuations, improve the power generation efficiency of the waste heat generator set, and use the peak and valley electricity price difference to create benefits, reduce the production costs of enterprises, and promote the consumption of renewable energy to achieve low-carbon operation of the steel production process.

[0086] In order to prevent power fluctuations when the power generation module 2 of this embodiment transmits power to the power supply and distribution module 3, a ring-shaped optical fiber current transformer 13 is provided on the connection line between the power generation module 2 and the power supply and distribution module 3. A compensation circuit connected to the optical fiber current transformer is provided in the power supply and distribution module 3. Figure 1 As shown, by providing the annular optical fiber current transformer 13, it is possible to prevent the formation of a barrier during current transmission and avoid interference. By providing a compensation circuit, the current transmission is made more stable.

[0087] In the solid waste heat collection module, during the slag transmission process, the thermal energy of the slag is collected by heat exchange, and the smelting slag that is continuously undergoing hot slag treatment is heated to a temperature at which the hot slag process can be implemented. The reducing substances in the smelting slag are used to reduce the oxides in the liquid slag of the converter, and the thermal energy is transferred to the chemical energy of the reaction.

[0088] After the modification reaction, the oxides SiO2, MnO, Al2O3, etc., may also react with f-CaO and f-MgO in the slag to form slag under the right temperature, which is beneficial to the improvement of the stability of the steel slag after treatment. The heat energy required for the slag formation reaction still comes from the sensible heat of the steel slag. The main equation of the slag formation reaction of the steel slag is:

[0089] SiO2+2f-CaO→C2S-Q

[0090] SiO2+3f-CaO→C3S-Q

[0091] Al2O3+f-CaO→CmAn-Q

[0092] f-CaO+SiO2+2f-MgO→CMS-Q

[0093] By using the above-mentioned steel slag waste heat to bake moist alloys and slag auxiliary materials, the raw materials for steelmaking, such as fluorite, limestone, dolomite, etc., will have a certain humidity during transportation. In the steelmaking process, the moisture in the raw materials will absorb the heat energy of steelmaking and increase energy consumption. On the other hand, when used in the steelmaking process, the moisture will come into contact with the high-temperature molten steel and a decomposition reaction will occur, posing a potential safety hazard of explosion accidents.

[0094] In the gas collection waste heat module of converter steelmaking, when the converter steelmaking, due to the oxygen blown into the furnace, the carbon element in the iron or steel reacts with the oxygen blown in by the oxygen lance to produce coal gas. Metallurgical coal gas includes coke oven gas, blast furnace gas, converter gas and coke oven gas. The above coal gas is purified and pressurized to produce high-temperature flue gas, which drives the gas turbine to do work.

[0095] In case of fluctuations in sintering flue gas parameters and poor waste heat power generation, a part of the coal gas can be supplemented in the flue gas to produce 1000°C high-temperature flue gas, which is mixed with part of the 400°C flue gas. The flue gas temperature in the air-supplementing combustion chamber reaches above 700°C, and the saturated steam is heated to become 450°C superheated steam, which can maximize the efficiency of the neutralization system and improve the power generation efficiency.

[0096] In view of the impact of steelmaking flue gas fluctuations on the steam production of waste heat boilers, a certain amount of coal gas can be supplemented, and the integrated system can achieve comprehensive ladder-shaped utilization of different waste heat and waste energy.

[0097] In order to solve the problem that the exhaust gas temperature is low due to the mixing of cold air into the reversing valves of coke ovens and heating furnaces, low-pressure steam is used to heat the intake air first to increase the exhaust gas temperature, and then blast furnace gas is supplemented for high-temperature combustion to achieve high- and low-level flue gas complementarity to improve power generation efficiency.

[0098] In order to deal with the large amount of low-temperature cooling water at 40-50 degrees Celsius in the venue, heat pump technology is used, supplemented by a small amount of steam, to increase the temperature of the circulating water before it is supplied.

[0099] In addition, in the coking process, the utilization of the latent heat of coke oven gas, namely the gas utilization technology, has been popularized; the sensible heat of coke oven gas has not yet been recovered. The methods currently under research include recovery using ammonia water, recovery using a primary cooler, recovery using a riser vaporization cooler, recovery using a riser heat pipe, and direct thermal cracking or reforming; the sensible heat of coke is recovered using dry quenching technology.

[0100] In the sintering process, most steel mills have recovered the sensible heat of sintered ore through direct utilization (hot air sintering, hot air ignition and combustion support, and sintering mixture drying) or waste heat power generation. The current research direction is the sintered ore waste heat tank recovery power generation process and the sensible heat of sintering flue gas. Most steel mills have not recovered it, and their recovery method is mainly sintering flue gas circulation technology, which is currently in the research stage.

[0101] In the iron-making process, the latent heat of blast furnace gas, i.e., gas utilization technology, has been popularized; except for a small part of the sensible heat of blast furnace gas that is recovered through TRT conversion, it is basically not recovered, and the sensible heat recovery technology of blast furnace gas has yet to be developed; the recovery of sensible heat of blast furnace slag is mostly achieved through slag water heating, which has been applied in production practice by some northern enterprises. The current research focuses on recovery methods such as dry granulation recovery method, wind quenching method, and centrifugal method; the residual pressure on the blast furnace top can be recovered using TRT technology, and all 1000m 3 The above blast furnaces and some small blast furnaces have achieved this. The method currently being studied is the dry TRT recovery method. For the recovery and utilization of sensible heat of hot blast furnace flue gas, domestic steel mills achieve it through dual preheating of coal gas and air. The current research focus is on the development of high-performance heat exchangers with high temperature resistance, corrosion resistance and good air tightness.

[0102] In the steelmaking process, the utilization of coal gas latent heat, that is, coal gas utilization has become popular; the sensible heat of converter flue gas is recovered and utilized through vaporization cooling. The ongoing research focuses on steam power generation and heat recovery and storage of thermal conductive phase change materials; the sensible heat of electric furnace flue gas is not recovered, and the electric furnace flue gas vaporization cooling system is being studied at the research center; the sensible heat of slag is not recovered either, and the technology needs to be developed; the sensible heat of steel billets is recovered through hot charging and hot delivery of continuous casting billets. This technology has matured and become popular. The current research focuses on the recovery and utilization of superheated steel and solidification latent heat and physical sensible heat of continuous casting billets.

[0103] In actual production, among all waste heat and waste energy resources, by-product gas accounts for the largest proportion, about 74.6%, of which coke oven gas accounts for 22.29%, blast furnace gas accounts for 43.66%, and converter gas accounts for 9.02%. The gas is collected in the gas pipeline network and supplied to each process or burned to be converted into electrical energy. The technology is mature and fully recycled. The factory power supply and distribution system of this embodiment, through the power consumption module 1, power generation module 2, and power supply and distribution module 3 set as above, can realize the recycling and utilization of gas, solid, and liquid waste heat energy, while effectively reducing the energy conversion cost in the process of converting gas into electrical energy, and reducing the investment cost of the power distribution system of the project.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A factory power supply and distribution system, characterized in that: It comprises a power consumption module (1), a power generation module (2), and a power supply and distribution module (3); The power supply and distribution module (3) is electrically connected to an external power grid, the power generation module (2) transmits electric energy to the power supply and distribution module (3), and the power supply and distribution module (3) has a power distribution module that transmits electric energy to the power consumption module (1); The power modules (1) include a coking power module, a sintering power module, a steelmaking power module, a rolling power module, and other power modules; The power generation module (2) comprises a coal gas power generation module and a waste heat and waste energy power generation module, wherein a coal gas collection pipeline and a coal gas transmission pipeline are arranged between the coal gas power generation modules, and the coal gas transmission pipeline transmits gas from the coal gas power generation module to the coking power module, the sintering power module, and the steelmaking power module; The waste heat and waste energy power generation module comprises a gas waste heat collection module and a liquid waste heat collection module, as well as a solid waste heat collection module, which are arranged between the power consumption module (1); It also includes a smart power distribution module for remote smart power distribution and monitoring; The smart power distribution module is also provided with an environmental monitoring component, which includes an environmental controller, a water immersion sensor, a thermometer and a regulator; The smart power distribution module is also provided with an electronic display, and the main control terminal is connected to the electronic display signal. The main control terminal can display the current parameters of the high-voltage end of the factory through the electronic display, so as to intuitively display the operation status of the smart substation power distribution system.

2. The factory power supply and distribution system according to claim 1, characterized in that: The coal gas power generation module includes a blast furnace gas power generation module and a boiler steam power generation module.

3. The factory power supply and distribution system according to claim 2, characterized in that: The gas waste heat collection module is used to collect steam and combustible gas in each process of the power module (1); The liquid waste heat collection module collects molten iron and molten steel before final rolling into products; The solid waste heat collection module collects the sintered ore and pelletized ore in the sintering power module, and collects the blast furnace slag and steel slag in the steelmaking power module.

4. The factory power supply and distribution system according to claim 3, characterized in that: The coal gas power generation module includes a filtering and dust removal device, a gearbox, a steam turbine, a generator, a gas turbine, a waste heat boiler and a condenser which are arranged in sequence; The flue gas of the gas turbine is connected to the waste heat boiler, and the superheated steam in the waste heat boiler is connected to the air inlet of the steam turbine; The steam in the steam turbine is connected to the condenser through a steam channel, and the condenser is used to condense the steam into cooling water, and the cooling water is transported to the waste heat boiler. The condenser is provided with a first connecting gas path (6) for transporting cooling gas; The coal gas collection pipeline is provided with a pressure part (4), the pressure part (4) is connected to the coal gas delivery pipeline via a connecting pipeline (5), and the outlet of the pressure part (4) is communicated with the inlet of the coal gas delivery pipeline. The outlet of the pressure part (4) is also connected to the coal gas power generation module (2), and a connecting pipeline (7) is provided between the first connecting gas path (6) and the pressure part (4).

5. The factory power supply and distribution system according to claim 4, characterized in that: The pressure part (4) comprises a pressure tank, the pressure tank is provided with an air inlet (401) for inputting collected coal gas, and an air outlet (402) for outflowing coal gas, the air inlet (401) and the air outlet (402) are arranged on the same side, and the air outlet (402) is provided with a relief valve (403); A pressure chamber is provided in the pressure tank, and the pressure chamber includes a working chamber (404) and a pressure regulating chamber (405) at one end away from the air inlet (401); The pressure tank is provided with a connection port (406) which is in communication with the first connecting gas path (6), and the connection port (406) is arranged correspondingly to the pressure regulating chamber (405).

6. The factory power supply and distribution system according to claim 5, characterized in that: The pressure regulating chamber (405) is provided with a flow port (407), and the flow port (407) leads to the working chamber (404); The circulation port (407) is provided with a first pressure regulating valve (408), and the connection port (406) is provided with a second pressure regulating valve (409).

7. The factory power supply and distribution system according to claim 5, characterized in that: A pressure sensor (8) is provided on the first connecting gas path (6).

8. The factory power supply and distribution system according to claim 4, characterized in that: The coal gas delivery pipeline further comprises at least one first delivery gas path (9), and a second delivery gas path (10) connected to the first delivery gas path (9); The first gas delivery path (9) is used to deliver the collected mixed coal gas, and the second gas delivery path (10) is used to deliver compressed gas; The first delivery gas path (9) and the second delivery gas path (10) are mixed to form a first mixed gas path (11); The first mixed gas path (11) is in communication with the air inlet (401).

9. The factory power supply and distribution system according to claim 8, characterized in that: The first conveying gas path (9) and the second conveying gas path (10) are mixed to form a second mixed gas path (12), and the second mixed gas path (12) is connected to the steelmaking electrical module; The first mixed gas path (11) and the second mixed gas path (12) are arranged in parallel.

10. The factory power supply and distribution system according to claim 1, characterized in that: A ring-shaped optical fiber current transformer (13) is provided on the connection line between the power generation module (2) and the power supply and distribution module (3); The power supply and distribution module (3) is provided with a compensation circuit inductively connected to the optical fiber current transformer.

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