Low-quality steam self-balancing system

Abstract

The utility model discloses a low-quality steam self-balancing system which comprises a saturated steam main pipe network, a first waste heat furnace, a second waste heat furnace, a third waste heat furnace and a steam supply end are arranged on the saturated steam main pipe network, and a heat accumulator is arranged between the saturated steam main pipe network and the first waste heat furnace; and the superheated steam main pipe network is connected with the saturated steam main pipe network through a saturated steam connection pipeline and a superheated steam connection pipeline, and a fourth waste heat furnace and a generator set are arranged on the superheated steam main pipe network. By building the saturated steam main pipe network and the superheated steam main pipe network, basic balance of production and use of saturated steam and superheated steam power generation are achieved, the defects that when the production amount of the saturated steam is larger than the use amount, steam diffusion is caused, and when the production amount of the saturated steam is smaller than the use amount, the superheated steam is used for supplementing the saturated steam are overcome; therefore, self-balance of low-quality steam is achieved, steam diffusion is reduced, and stable supply of steam is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low quality steam recycling use technical field especially relates to a low quality steam self -balancing system. BACKGROUND

[0002] In the production process of most steel enterprises, low pressure saturated steam produced by recovering waste heat of converter and heating furnace and low pressure superheated steam produced by recovering sintering waste heat, compared with medium pressure steam and high pressure steam with higher parameters, are low in parameter and poor in quality, which can be called low quality steam. Saturated steam is generally used for production and living heat supply, and superheated steam is generally used for low parameter steam power generation.

[0003] The saturated steam produced by converter fluctuates greatly in pressure, temperature and flow due to blowing period, and is difficult to meet the use demand of users because of serious water carrying. The saturated steam produced by heating furnace is stable in pressure, temperature and flow, but the output is small. The low pressure superheated steam produced by sintering machine in the process of sintering and sintering material cooling is relatively stable in pressure, temperature and flow, and is relatively high in quality, but the self consumption is small, and needs to be transported to other users for use.

[0004] Due to different steam qualities, different steam pipe networks are set, such as converter saturated steam pipe network, heating furnace saturated steam pipe network and sintering waste heat steam pipe network. However, such pipe network system is complex, and it is difficult to balance the production and use of steam. Seasonal change, production fluctuation and uneven use lead to steam dissipation or deficiency, which not only causes resource loss, but also affects production.

[0005] Therefore, the prior art should be improved. UTILITY MODEL CONTENT

[0006] The low quality steam self-balancing system of the utility model realizes the basic balance of saturated steam production and use and superheated steam power generation by constructing saturated steam main pipe network and superheated steam main pipe network, reduces steam dissipation when saturated steam production is greater than use, supplements the deficiency when saturated steam production is less than use with superheated steam, so as to realize the self-balance of low quality steam, reduce steam dissipation, and realize stable supply of steam.

[0007] According to one aspect of the utility model, a low quality steam self-balancing system is provided, which comprises:

[0008] The system includes a saturated steam main pipeline, on which are installed a first waste heat furnace, a second waste heat furnace, a third waste heat furnace capable of producing saturated steam, and a steam supply terminal for supplying steam to users. A heat accumulator is installed between the saturated steam main pipeline and the first waste heat furnace. The system also includes a superheated steam main pipeline, which is connected to the saturated steam main pipeline via saturated steam connecting pipes and superheated steam connecting pipes. A fourth waste heat furnace capable of producing superheated steam and a generator set using superheated steam are installed on the superheated steam main pipeline.

[0009] According to one embodiment of the present invention, a saturated steam connection pipe is provided with a saturated steam connection valve to enable or disable it; a superheated steam connection pipe is provided with a superheated steam connection valve to enable or disable it.

[0010] According to one embodiment of the present invention, the first waste heat furnace, the second waste heat furnace and the third waste heat furnace are respectively provided with steam venting doors; the fourth waste heat furnace is provided with a steam venting door.

[0011] According to one embodiment of the present invention, the generator set is a steam turbine generator set.

[0012] According to one embodiment of the present invention, the first waste heat furnace is a converter waste heat furnace, the second waste heat furnace is a heating furnace waste heat furnace, the third waste heat furnace is a supplementary waste heat furnace, and the fourth waste heat furnace is a sintering waste heat furnace.

[0013] According to one embodiment of the present invention, steam valves are respectively provided between the first waste heat furnace, the second waste heat furnace, the third waste heat furnace and the steam supply end and the saturated steam main network, and a steam valve is provided between the fourth waste heat furnace and the superheated steam main network.

[0014] According to one embodiment of the present invention, a steam-water separator and a steam superheater are provided on the saturated steam connecting pipeline.

[0015] According to one embodiment of the present invention, steam pressure gauges are respectively installed on the saturated steam main network and the superheated steam main network.

[0016] According to one embodiment of the present invention, a steam inlet valve and a steam inlet regulating valve are provided on the superheated steam main pipeline.

[0017] According to one embodiment of the present invention, a check valve is provided on the saturated steam connecting pipeline and the superheated steam connecting pipeline.

[0018] Through the above technical solution, this utility model achieves a basic balance between saturated steam production and use and generates electricity from superheated steam by constructing a saturated steam main network and a superheated steam main network. It reduces steam venting when saturated steam production exceeds usage and uses superheated steam to supplement the deficiency when saturated steam production is less than usage, thereby achieving self-balancing of low-quality steam, reducing steam venting, and achieving a stable steam supply. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the low-quality steam self-balancing system disclosed in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Saturated steam main pipeline; 2. Superheated steam main pipeline; 3. Saturated steam connecting pipeline; 4. Superheated steam connecting pipeline; 5. Converter waste heat furnace; 6. Heating furnace waste heat furnace; 7. Supplementary waste heat furnace; 8. Steam supply end; 9. Sintering waste heat furnace; 10. Steam turbine generator set; 11. Regenerator; 12. Steam vent valve; 13. Steam valve; 14. Steam-water separator; 15. Steam superheater; 16. Steam pressure gauge; 17. Steam inlet valve; 18. Steam inlet regulating valve; 19. Check valve; 20. Saturated steam regulating valve; 21. Superheated steam regulating valve; 22. Pressure gauge valve; 23. Saturated steam connecting valve; 24. Superheated steam connecting valve. Detailed Implementation

[0023] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this utility model by way of example, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0024] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0025] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0027] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0028] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] like Figure 1As shown, this utility model provides a low-quality steam self-balancing system, which includes a saturated steam main pipeline 1, on which a first waste heat furnace, a second waste heat furnace, a third waste heat furnace, and a steam supply end 8 for supplying steam to users are provided, and a heat accumulator 11 is provided between the saturated steam main pipeline 1 and the first waste heat furnace; and a superheated steam main pipeline 2, which is connected to the saturated steam main pipeline 1 through a saturated steam connecting pipe 3 and a superheated steam connecting pipe 4, and a fourth waste heat furnace and a generator set are provided on the superheated steam main pipeline 2.

[0031] In order to achieve the recovery of low-quality steam for heating, cooling and power generation, and to achieve self-balance between the production and use of low-quality steam, the design operating pressure of superheated steam main network 2 and saturated steam main network 1 should be the same, and fluctuations are allowed within a certain range.

[0032] By constructing a saturated steam main pipeline 1, the saturated steam from the converter, heating furnace, etc. is transported to the saturated steam main pipeline 1 and then distributed to various users through the saturated steam main pipeline 1. A steam accumulator 11 is installed on the converter saturated steam output pipeline to stabilize the flow rate, pressure and temperature of the converter saturated steam output.

[0033] A superheated steam main pipeline 2 is constructed to transport superheated steam from sintering and other processes to the superheated steam main pipeline 2, and then distribute it to the steam turbine generator set 10 through the superheated steam main pipeline 2.

[0034] The saturated steam connection pipe 3 is equipped with a saturated steam connection valve 23 to allow it to open or close; the superheated steam connection pipe 4 is equipped with a superheated steam connection valve 24 to allow it to open or close.

[0035] Construct a saturated steam main pipeline 1 to a superheated steam connecting pipeline 4. When the steam pressure in the saturated steam main pipeline 1 is high, saturated steam will be transported to the superheated steam main pipeline 2.

[0036] Construct a superheated steam main pipeline 2 to a saturated steam connecting pipeline 3. When the steam pressure of the saturated steam main pipeline 1 is low, superheated steam will be transported to the saturated steam main pipeline 1.

[0037] A saturated steam connection valve 23 is installed on the saturated steam connection pipeline 3. When the pressure of the saturated steam main pipeline 1 is high to the preset pressure range, the saturated steam connection valve 23 is automatically opened to deliver saturated steam to the superheated steam main pipeline 2. When the saturated steam pressure is lower than the preset value, the saturated steam connection valve 23 is automatically closed.

[0038] A superheated steam connection valve 24 is installed on the superheated steam connection pipeline 4. When the pressure of the saturated steam main pipeline 1 is lower than the preset pressure range, the superheated steam connection valve 24 is automatically opened to deliver superheated steam to the saturated steam main pipeline 1. When the pressure of the saturated steam main pipeline 1 is higher than the preset value, the superheated steam connection valve 24 is automatically closed.

[0039] In some specific embodiments, the first waste heat furnace, the second waste heat furnace, and the third waste heat furnace are respectively provided with steam venting doors 12. The steam venting doors 12 are used to discharge excess steam and control steam pressure.

[0040] Based on the above embodiments, a steam vent 12 is provided on the fourth waste heat furnace.

[0041] In some specific embodiments, the generator set is a steam turbine generator set 10. The steam turbine generator set 10 can reasonably achieve energy quality matching, utilize thermal energy according to quality, improve energy conversion efficiency, convert high-grade thermal energy into electrical energy, and at the same time utilize the waste heat after power generation to meet the demand for low-grade energy, thus realizing the cascade utilization of energy.

[0042] The steam turbine generator set 10 can consume all superheated steam and the maximum amount of saturated steam released throughout the year.

[0043] The steam turbine generator set 10 has a load regulation capacity of 30% to 110%.

[0044] The steam turbine generator set 10 has the ability to operate under sliding pressure, that is, the steam turbine generator set 10 can autonomously adjust the load according to changes in steam pressure.

[0045] The saturated steam main pipeline 1 can transport surplus saturated steam to the superheated steam main pipeline 2 via the saturated steam connecting pipeline 3 for power generation by the steam turbine generator set 10.

[0046] The superheated steam main pipeline 2 can transport superheated steam to the saturated steam main pipeline 1 through the superheated steam connecting pipeline 4 when the pressure of the saturated steam main pipeline 1 is low, thereby increasing the saturated steam pressure and meeting user needs.

[0047] Based on the above embodiments, the first waste heat furnace is a converter waste heat furnace 5, the second waste heat furnace is a heating furnace waste heat furnace 6, the third waste heat furnace is a supplementary waste heat furnace 7, and the fourth waste heat furnace is a sintering waste heat furnace 9.

[0048] The saturated steam generated by the converter waste heat furnace 5 is stored and stabilized by the heat accumulator 11 and then connected to the saturated steam main network 1. The saturated steam generated by the heating furnace waste heat furnace 6 and the supplementary waste heat furnace 7 is connected to the saturated steam main network 1 and then distributed by the saturated steam main network 1 to the steam supply end 8 for users.

[0049] In some specific embodiments, steam valves 13 are respectively provided between the first waste heat furnace, the second waste heat furnace, the third waste heat furnace and the steam supply end 8 and the saturated steam main network 1, and steam valves 13 are provided between the fourth waste heat furnace and the superheated steam main network 2.

[0050] The superheated steam produced by the sintering waste heat furnace 9 is incorporated into the superheated steam main pipeline 2, and then distributed by the superheated steam main pipeline 2 to the steam turbine generator set 10 for power generation.

[0051] Saturated steam enters steam pressure gauge 16 via pressure gauge valve 22 from saturated steam main network 1, and superheated steam enters steam pressure gauge 16 via pressure gauge valve 22 from superheated steam main network 2.

[0052] Based on the above embodiments, a steam-water separator 14 and a steam superheater 15 are provided on the saturated steam connecting pipe 3.

[0053] After installing a steam-water separator 14 on the saturated steam connecting pipe 3, a steam superheater 15 is installed to heat the saturated steam into superheated steam.

[0054] In some specific embodiments, steam pressure gauges 16 are respectively installed on the saturated steam main network 1 and the superheated steam main network 2.

[0055] Based on the above embodiments, the superheated steam main pipeline 2 is provided with a steam inlet valve 17 and a steam inlet regulating valve 18.

[0056] Based on the above embodiments, a check valve 19 is installed after the steam superheater 15 to prevent superheated steam from flowing back into the saturated steam main network 1; a check valve 19 is installed at the end of the superheated steam main network 2 to the saturated steam connecting pipeline 3 to prevent saturated steam from flowing back into the superheated steam main network 2.

[0057] When the steam pressure gauge 16 detects that the pressure of the saturated steam main pipeline 1 is too high and may cause steam to be released, the saturated steam connection valve 23 on the saturated steam connection pipeline 3 will automatically open. The saturated steam will enter the steam-water separator 14 for dehydration through the saturated steam regulating valve 20. The dehydrated saturated steam will then enter the steam superheater 15 for superheating through the steam valve 13. The superheated steam will then enter the superheated steam main pipeline 2 through the steam valve 13 and the check valve 19, thereby reducing the pressure of the saturated steam main pipeline 1 and preventing steam from being released from the waste heat furnaces. When the steam pressure gauge 16 detects that the pressure of the saturated steam main pipeline 1 is equal to or slightly lower than the pressure of the superheated steam main pipeline 2 detected by the steam pressure gauge 16, the saturated steam connection valve 23 will automatically close.

[0058] When the steam pressure gauge 16 detects that the pressure of the saturated steam main network 1 is low enough to potentially lead to insufficient user demand, the superheated steam connection valve 24 on the superheated steam connection pipeline 4 automatically opens. Superheated steam enters the saturated steam main network 1 through the superheated steam regulating valve 21 and the check valve 19, appropriately increasing the pressure of the saturated steam main network 1 to meet the user's needs. When the steam pressure gauge 16 detects that the pressure of the saturated steam main network 1 is equal to or slightly higher than the pressure of the superheated steam main network 2 detected by the steam pressure gauge 16, the superheated steam connection valve automatically closes.

[0059] A specific application of this application is as follows: saturated steam generated by the converter waste heat furnace 5 is stored and stabilized by the accumulator 11 and then connected to the saturated steam main pipeline 1. Saturated steam generated by the heating furnace waste heat furnace 6 and the supplementary waste heat furnace 7 is connected to the saturated steam main pipeline 1 and then distributed by the saturated steam main pipeline 1 to the steam supply end 8 for user use. Superheated steam generated by the sintering waste heat furnace 9 is connected to the superheated steam main pipeline 2 and then distributed by the superheated steam main pipeline 2 to the steam turbine generator set 10 for power generation. When the pressure of the saturated steam main pipeline 1 is high enough to reach the preset pressure range, the saturated steam connecting valve 23 is automatically opened to transport saturated steam to the superheated steam main pipeline 2. When the saturated steam pressure is lower than the preset value, the saturated steam connecting valve 23 is automatically closed. When the pressure of the saturated steam main pipeline 1 is low enough to reach the preset pressure range, the superheated steam connecting valve 24 is automatically opened to transport superheated steam to the saturated steam main pipeline 1. When the saturated steam pressure is higher than the preset value, the superheated steam connecting valve 24 is automatically closed.

[0060] This invention utilizes the recovery of saturated steam generated from waste heat in a converter. After heat storage and pressure stabilization, the steam is combined with saturated steam produced by the heating furnace and supplementary waste heat furnace 7 and fed into the saturated steam pipeline network for user use. Superheated steam produced by the sintering waste heat furnace 9 is fed into the superheated steam main pipeline 2 to power the turbine generator set 10. When the pressure in the saturated steam main pipeline 1 is too high, causing steam venting, the saturated steam can be dehydrated and superheated through the saturated steam connecting pipeline 3 and then transported to the superheated steam main pipeline 2 for power generation by the turbine generator set 10. When the pressure in the saturated steam main pipeline 1 is too low, affecting user steam consumption, the superheated steam can be transported to the saturated steam main pipeline 1 through the superheated steam connecting pipeline 4 to increase the saturated steam pressure and meet user needs. Through these methods, the self-balancing of low-quality steam in the steel complex is achieved, thereby meeting user needs and reducing steam venting.

[0061] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0062] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A low-quality steam self-balancing system, characterized in that, include: A saturated steam main pipeline, wherein a first waste heat furnace, a second waste heat furnace, a third waste heat furnace capable of producing saturated steam, and a steam supply terminal for supplying steam to users are provided on the saturated steam main pipeline; a heat accumulator is provided between the saturated steam main pipeline and the first waste heat furnace; and A superheated steam main pipeline is connected to the saturated steam main pipeline via saturated steam connecting pipelines and superheated steam connecting pipelines. The superheated steam main pipeline is equipped with a fourth waste heat furnace capable of producing superheated steam and a generator set that uses superheated steam. The generator set can consume all superheated steam and the saturated steam with the maximum annual statistical emission value, and has a load regulation capacity of 30% to 110%, has sliding pressure operation capability, and can autonomously adjust the load according to changes in steam pressure.

2. The low-quality steam self-balancing system according to claim 1, characterized in that, The saturated steam connection pipeline is equipped with a saturated steam connection valve to allow it to open or close; the superheated steam connection pipeline is equipped with a superheated steam connection valve to allow it to open or close.

3. The low-quality steam self-balancing system according to claim 1, characterized in that, The first, second, and third waste heat furnaces are each equipped with a steam vent; the fourth waste heat furnace is equipped with a steam vent.

4. The low-quality steam self-balancing system according to claim 1, characterized in that, The generator set is a steam turbine generator set.

5. The low-quality steam self-balancing system according to claim 1, characterized in that, The first waste heat furnace is a converter waste heat furnace, the second waste heat furnace is a heating furnace waste heat furnace, the third waste heat furnace is a supplementary waste heat furnace, and the fourth waste heat furnace is a sintering waste heat furnace.

6. The low-quality steam self-balancing system according to claim 1, characterized in that, Steam valves are respectively installed between the first waste heat furnace, the second waste heat furnace, the third waste heat furnace and the steam supply end and the saturated steam main network, and a steam valve is installed between the fourth waste heat furnace and the superheated steam main network.

7. The low-quality steam self-balancing system according to claim 1, characterized in that, The saturated steam connection pipeline is equipped with a steam-water separator and a steam superheater.

8. The low-quality steam self-balancing system according to claim 1, characterized in that, Steam pressure gauges are installed on both the saturated steam main network and the superheated steam main network.

9. The low-quality steam self-balancing system according to claim 1, characterized in that, The superheated steam main pipeline is equipped with a steam inlet valve and a steam inlet regulating valve.

10. The low-quality steam self-balancing system according to claim 1, characterized in that, Check valves are installed on the saturated steam connection pipeline and the superheated steam connection pipeline.

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