Waste heat utilization system for steelmaking steam power generation

Abstract

The utility model discloses a waste heat utilization system for steelmaking steam power generation, which is characterized in that a steam inlet of a heat accumulator station group is connected with a steelmaking steam outlet, a steam outlet of the heat accumulator station group is respectively connected with a steam inlet of a steam header entering a production pipe network and a steam inlet of a steam-water separator, and a steam outlet of the steam-water separator is connected with a steam inlet of an overheating furnace; a steam outlet of the superheater is connected with one end of the main steam inlet pipeline and one end of the steam supplement pipeline, the other end of the main steam inlet pipeline is connected with a main steam inlet of the turbine, and the other end of the steam supplement pipeline is connected with a steam supplement inlet of the turbine. According to the utility model, steel-making steam with certain fluctuation of pressure and temperature can be superheated by the superheating furnace and then can be used for sintering waste heat power generation main steam to efficiently generate power and sintering waste heat power generation steam supplement to generate power, so that all the steel-making steam can be converted into electric energy, the cost is saved, and huge economic benefits are generated at the same time.

Description

Technical Field

[0001] The utility model relates to a waste heat utilization system, in particular to a waste heat utilization system for generating electricity with steelmaking steam, belonging to the technical field of steelmaking. Background Art

[0002] In the process of converter steelmaking, a large amount of steam is generated by the steelmaking vaporization waste heat boiler. Due to the discontinuity of the converter steelmaking process, the operation of the converter changes periodically, and the steam generated by using the sensible heat of converter gas is also discontinuous. At the same time, the parameters of this steam, such as pressure and temperature, have certain fluctuations. These steams meet the steam requirements for the smelting process in iron and steel enterprises, but there is still excess steam that is discharged. These discharged steams cause huge waste. If this steam can be used for power generation, not only the self-generation rate of metallurgical enterprises can be increased, but also the steam can be condensed and recycled, saving the costs of iron and steel enterprises. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a waste heat utilization system for generating electricity with steelmaking steam to fully utilize the steelmaking steam.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0005] A waste heat utilization system for generating electricity with steelmaking steam includes a heat accumulator station group, a steam header for entering the production pipeline network, a steam-water separator, and a superheater. The steam inlet of the heat accumulator station group is connected to the steelmaking steam outlet. The steam outlets of the heat accumulator station group are respectively connected to the steam inlet of the steam header for entering the production pipeline network and the steam inlet of the steam-water separator. The steam outlet of the steam-water separator is connected to the steam inlet of the superheater. The steam outlet of the superheater is connected to one end of the main steam pipeline and one end of the supplementary steam pipeline. The other end of the main steam pipeline is connected to the main steam inlet of the steam turbine, and the other end of the supplementary steam pipeline is connected to the supplementary steam inlet of the steam turbine.

[0006] Further, the heat accumulator station group is composed of multiple heat accumulator stations connected in parallel. The steam inlet of each heat accumulator station is connected to the steelmaking steam outlet pipeline through a heat accumulator station steam inlet pipeline. Each heat accumulator station is provided with a heat accumulator inlet valve group, and the steelmaking steam outlet pipeline is provided with a steelmaking steam outlet valve group.

[0007] Further, the steam outlet of each heat accumulator station is connected to the steam inlet of the steam header for entering the production pipeline network through a pipeline for entering the production pipeline network. One end of the pipeline for entering the production pipeline network connected to the heat accumulator station is provided with a heat accumulator outlet valve group, and one end of the pipeline for entering the production pipeline network connected to the steam header for entering the production pipeline network is provided with a valve group for entering the production pipeline network.

[0008] Further, the heat accumulator station group is connected to the steam inlet of the steam-water separator through the steelmaking steam pipe network. A heat accumulator outlet flowmeter is provided at one end of the steelmaking steam pipe network connected to the heat accumulator station group, and a superheater inlet flowmeter and a superheater inlet valve group are provided at one end of the steelmaking steam pipe network connected to the steam-water separator.

[0009] Further, the steam outlet of the superheater is connected to one end of the superheater steam outlet pipe, and the other end of the superheater steam outlet pipe is connected to one end of the main steam inlet pipe and one end of the supplementary steam inlet pipe.

[0010] Further, a superheater steam outlet valve group is provided at one end of the superheater steam outlet pipe connected to the superheater, and a superheater steam outlet flowmeter is provided at one end of the superheater steam outlet pipe connected to the main steam inlet pipe and the supplementary steam inlet pipe.

[0011] Further, a main steam inlet valve group and a main steam inlet flowmeter are sequentially provided on the main steam inlet pipe.

[0012] Further, a supplementary steam inlet valve group and a supplementary steam inlet flowmeter are sequentially provided on the supplementary steam inlet pipe.

[0013] Compared with the prior art, the present utility model has the following advantages and effects:

[0014] 1. The present utility model can superheat the steelmaking steam with certain pressure and temperature fluctuations through the superheater, and then the superheated steam can enter the main steam of the sintering waste heat power generation for efficient power generation, and can also enter the supplementary steam of the sintering waste heat power generation for power generation, so that all the steam can be converted into electric energy; at the same time, it can be combined with the sintering waste heat power generation system, make full use of the remaining load of the sintering waste heat power generation, save costs and generate huge economic benefits.

[0015] 2. The present utility model can control the pressure loss of the 3-kilometer pipe network within 0.2 MPa; control the resistance loss of the superheater equipment within 0.1 MPa, and realize the power generation of the steelmaking entering the main steam system of the sintering waste heat power generation.

[0016] 3. The present utility model can share a waste heat power generation unit for the steelmaking steam and the sintering waste heat steam, realizing investment savings, cost reduction and efficiency increase.

[0017] 4. After the steelmaking discharged steam is used for waste heat power generation, the present utility model can turn the steam into condensed water for reuse, realizing the circular utilization of steam - condensed water - steam, reducing costs and increasing efficiency. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a waste heat utilization system for steelmaking steam power generation of the present utility model.

[0019] Figure 2 is a partial schematic diagram of a waste heat utilization system for steelmaking steam power generation of the present utility model. Detailed implementation mode

[0020] In order to elaborate in detail the technical solutions adopted by the present utility model to achieve the predetermined technical purpose, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only partial embodiments of the present utility model, rather than all embodiments. And, without creative efforts, the technical means or technical features in the embodiments of the present utility model can be replaced. The following will refer to the drawings and combine with the embodiments to detail the present utility model.

[0021] As Figure 1 shown, a waste heat utilization system for steelmaking steam power generation of the present utility model includes a heat accumulator station group 1, a steam distribution header 2 for entering the production pipe network, a steam-water separator 3, and a superheater 4. The steam inlet of the heat accumulator station group 1 is connected to the steelmaking steam outlet. The steam outlet of the heat accumulator station group 1 is respectively connected to the steam inlet of the steam distribution header 2 for entering the production pipe network and the steam inlet of the steam-water separator 3. The steam outlet of the steam-water separator 3 is connected to the steam inlet of the superheater 4. The steam outlet of the superheater 4 is connected to one end of the main steam inlet pipe 5 and one end of the supplementary steam inlet pipe 6. The other end of the main steam inlet pipe 5 is connected to the main steam inlet of the steam turbine, and the other end of the supplementary steam inlet pipe 6 is connected to the supplementary steam inlet of the steam turbine. The steam at the steam outlet of the heat accumulator station group 1 is divided into two paths. One path enters the steam distribution header 2 for entering the production pipe network for pressure regulation, and after meeting the steam usage requirements of the steam production pipe network, it is distributed to each production user. The other path passes through the steam-water separator 3 to separate the saturated steelmaking steam. The steam after steam-water separation enters the superheater 4 for superheating. The superheated steam is divided into two paths. One path enters the main steam inlet of the steam turbine, and the other path enters the supplementary steam inlet of the steam turbine.

[0022] As Figure 2 shown, the heat accumulator station group 1 is composed of a plurality of heat accumulator stations 7 connected in parallel. The steam inlet of each heat accumulator station 7 is connected to the steelmaking steam outlet pipe 9 through the heat accumulator station steam inlet pipe 8. Each heat accumulator station 7 is provided with a heat accumulator steam inlet valve group 10, and the steelmaking steam outlet pipe 9 is provided with a steelmaking steam outlet valve group 11.

[0023] The steam outlet of each heat accumulator station 7 is connected to the steam inlet of the steam distribution header 2 for entering the production pipe network through the production pipe network inlet pipe 12. One end of the production pipe network inlet pipe 12 connected to the heat accumulator station 1 is provided with a heat accumulator steam outlet valve group 13, and one end of the production pipe network inlet pipe 12 connected to the steam distribution header 2 for entering the production pipe network is provided with a production pipe network inlet valve group 14.

[0024] The accumulator station group 1 is connected to the steam inlet of the steam-water separator 3 through the steelmaking steam pipe network 15. An accumulator outlet flowmeter 16 is provided at one end of the steelmaking steam pipe network 15 connected to the accumulator station group 1. An overheating furnace inlet flowmeter 17 and an overheating furnace inlet valve group 18 are provided at one end of the steelmaking steam pipe network 15 connected to the steam-water separator 3.

[0025] The steam outlet of the overheating furnace 4 is connected to one end of the overheating furnace steam outlet pipe 19. The other end of the overheating furnace steam outlet pipe 19 is connected to one end of the main steam inlet pipe 5 and one end of the supplementary steam inlet pipe 6.

[0026] An overheating furnace steam outlet valve group 20 is provided at one end of the overheating furnace steam outlet pipe 19 connected to the overheating furnace 4. An overheating furnace steam outlet flowmeter 21 is provided at one end of the overheating furnace steam outlet pipe 19 connected to the main steam inlet pipe 5 and the supplementary steam inlet pipe 6.

[0027] A main steam inlet valve group 22 and a main steam inlet flowmeter 23 are sequentially provided on the main steam inlet pipe 5.

[0028] A supplementary steam inlet valve group 24 and a supplementary steam inlet flowmeter 25 are sequentially provided on the supplementary steam inlet pipe 6.

[0029] The working principle of a waste heat utilization system for steelmaking steam power generation of the present utility model is as follows: The steam at the outlet of the accumulator station group is saturated steam with a pressure of 1.6 - 2.1 MPa. The pressure requirement for the main steam entering the sintering waste heat power generation is 1.6 - 1.9 MPa, and the temperature requirement is 330 - 360 °C. The pressure requirement for the supplementary steam entering the sintering waste heat power generation is 0.4 - 0.6 MPa, and the temperature requirement is 190 - 220 °C. After the steelmaking steam is stabilized by the accumulator, part of it is sent to the production system steam main pipe network through the desuperheating and pressure reducing valve group, and the other part is sent to the overheating furnace through the steelmaking steam pipe network (which is a different pipe network from the steam main pipe network). After the overheating furnace heats it to the sintering waste heat power generation main steam temperature of 330 - 360 °C using blast furnace gas, it enters the sintering waste heat power generation main steam or supplementary steam power generation according to the fluctuation of the steelmaking steam pressure. When the steelmaking steam reaches the overheating furnace inlet after overcoming the resistance losses of equipment such as the pipe network and the overheating furnace, if the pressure is controlled at 1.6 - 1.9 MPa, the steam at the outlet of the overheating furnace preferentially enters the main steam power generation. After the main steam is fully loaded for power generation, the remaining part of the steam enters the supplementary steam power generation after passing through the desuperheating and pressure reducing valve; when the steelmaking steam reaches the overheating furnace inlet after overcoming the resistance losses of equipment such as the pipe network and the overheating furnace, if the pressure is controlled below 1.6 MPa, the steam at the outlet of the overheating furnace directly becomes slightly superheated and then enters the supplementary steam power generation.

[0030] The utility model can superheat the steel-making steam with certain fluctuations in pressure and temperature through a superheater, and then the superheated steam can be used for high-efficiency power generation in the main steam of the sintering waste heat power generation system and also for supplementary steam power generation in the sintering waste heat power generation system, so that all of it can be converted into electric energy. At the same time, it can be combined with the sintering waste heat power generation system to make full use of the remaining load of the sintering waste heat power generation, saving costs and generating huge economic benefits. The utility model can control the pipeline pressure loss within 3 kilometers within 0.2 MPa; control the resistance loss of the superheater equipment within 0.1 MPa, and realize the power generation of the steel-making steam entering the main steam system of the sintering waste heat power generation. The utility model can share a waste heat power generation unit for the steel-making steam and the sintering waste heat steam, realizing investment savings, cost reduction and efficiency increase. After the steel-making discharged steam is used for waste heat power generation, the steam can be turned into condensate water for reuse, realizing the circular utilization of steam - condensate water - steam, reducing costs and increasing efficiency.

[0031] The above are only the preferred embodiments of the utility model, and do not impose any form of limitation on the utility model. Although the utility model has been disclosed above with the preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments with equivalent changes within the scope of the technical solution of the utility model. However, as long as it does not depart from the content of the technical solution of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiments according to the technical essence of the utility model within the spirit and principle of the utility model still fall within the protection scope of the technical solution of the utility model.

Claims

1. A waste heat utilization system for steelmaking steam power generation, characterized in that: It includes a heat accumulator station group, a steam cylinder entering the production pipeline network, a steam-water separator and a superheater. The steam inlet of the heat accumulator station group is connected to the steelmaking steam outlet, the steam outlet of the heat accumulator station group is respectively connected to the steam inlet of the steam cylinder entering the production pipeline network and the steam inlet of the steam-water separator, the steam outlet of the steam-water separator is connected to the steam inlet of the superheater, the steam outlet of the superheater is connected to one end of the main steam inlet pipeline and one end of the supplementary steam inlet pipeline, the other end of the main steam inlet pipeline is connected to the main steam inlet of the steam turbine, and the other end of the supplementary steam inlet pipeline is connected to the supplementary steam inlet of the steam turbine.

2. The waste heat utilization system for steelmaking steam power generation according to claim 1, characterized in that: The heat accumulator station group is composed of multiple heat accumulator stations in parallel. The steam inlet of each heat accumulator station is connected to the steelmaking steam outlet pipeline through the heat accumulator station steam inlet pipeline. Each heat accumulator station is provided with a heat accumulator steam inlet valve group, and the steelmaking steam outlet pipeline is provided with a steelmaking steam outlet valve group.

3. The waste heat utilization system for steelmaking steam power generation according to claim 2, characterized in that: The steam outlet of each heat accumulator station is connected to the steam inlet of the production network cylinder through the production network pipeline. The end where the production network pipeline is connected to the heat accumulator station is provided with a heat accumulator steam outlet valve group, and the end where the production network pipeline is connected to the production network cylinder is provided with a production network valve group.

4. The waste heat utilization system for steelmaking steam power generation according to claim 1, characterized in that: The regenerator station group is connected to the steam inlet of the steam-water separator through the steelmaking steam pipeline network. The end where the steelmaking steam pipeline network is connected to the regenerator station group is provided with a regenerator outlet flowmeter, and the end where the steelmaking steam pipeline network is connected to the steam-water separator is provided with a superheater steam inlet flowmeter and a superheater steam inlet valve group.

5. The waste heat utilization system for steelmaking steam power generation according to claim 1, characterized in that: The steam outlet of the superheater is connected to one end of the superheater steam outlet pipeline, and the other end of the superheater steam outlet pipeline is connected to one end of the main steam inlet pipeline and one end of the supplementary steam inlet pipeline.

6. The waste heat utilization system for steelmaking steam power generation according to claim 5, characterized in that: The end of the superheater steam outlet pipe connected to the superheater is provided with a superheater steam outlet valve group, and the end of the superheater steam outlet pipe connected to the main steam inlet pipe and the supplementary steam inlet pipe is provided with a superheater steam outlet flowmeter.

7. The waste heat utilization system for steelmaking steam power generation according to claim 1, characterized in that: The main steam inlet pipeline is sequentially provided with a main steam inlet valve group and a main steam inlet flow meter.

8. The waste heat utilization system for steelmaking steam power generation according to claim 1, characterized in that: The inlet and supplementary steam pipeline is sequentially provided with an inlet and supplementary steam valve group and an inlet and supplementary steam flow meter.

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