Multi-steam source saturated steam waste heat power generation system

Abstract

The utility model relates to the field of waste heat recovery discloses a kind of multi-steam source saturated steam waste heat power generation system, including steam main pipe, primary steam electric heater, secondary steam electric heater, steam cooler and steam turbine generator connected in turn by heat preservation pipeline;The saturated steam of each gas source is connected to steam main pipe by steam branch pipe;Steam flow meter, first temperature measuring device and first pressure measuring device are equipped on the steam main pipe;Second temperature measuring device and second pressure measuring device are equipped in the steam outlet of primary steam electric heater and secondary steam electric heater;Third temperature measuring device and third pressure measuring device are equipped in the steam outlet of steam cooler.The utility model realizes the improvement to multi-steam source saturated steam temperature, improves steam dryness, reduces steam drain discharge, improves the efficiency of waste heat resource recycling while guaranteeing the safe operation of multi-steam source saturated steam power generation.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery, and in particular to a multi-steam-source saturated steam waste heat power generation system. Background Technology

[0002] In the steel smelting industry, there are various heating furnaces and reaction furnaces. The exhaust gas temperature of these furnaces and reaction furnaces is generally around 400℃, and the flue gas flow rate is relatively small. The steam output of the waste heat boilers is also relatively small, and some heating furnaces operate intermittently, so the steam produced is generally saturated steam. To fully recover this waste heat resource, steel companies typically collect the multi-source saturated steam generated above and then directly use saturated steam power generation technology for energy recovery and utilization.

[0003] Because the steel smelting process is lengthy, with heating furnaces and reactors distributed across different plants and dispersed, they are typically collected via low-pressure steam headers and transported to the saturated steam turbine power generation area. Due to the varying steam transport distances from different sources, the steam cools in the pipelines, increasing its water content and jeopardizing the safe operation of the turbine. To improve steam dryness, steam filters are usually used to collect steam droplets and discharge the condensate. This condensate can reach approximately 5% of the steam flow rate, and can even exceed 10% over long distances. Furthermore, adjustments to the heating furnace process or ineffective filter collection can also lead to excessive water content in the steam. To ensure safe unit operation, actual industrial production typically discharges this steam externally or reduces the generator load, severely impacting energy efficiency.

[0004] Therefore, how to improve the dryness of saturated steam from multiple steam sources, ensure the safe operation of saturated steam power generation from multiple steam sources, and reduce the condensate from the steam header to reduce working fluid loss are issues of concern to the saturated steam power generation industry. Utility Model Content

[0005] This invention aims to solve the technical problems existing in the prior art. Therefore, this invention provides a multi-source saturated steam waste heat power generation system, which increases the temperature of multi-source saturated steam, improves steam dryness, reduces steam condensate discharge, and enhances the efficiency of waste heat resource recovery and utilization while ensuring the safe operation of multi-source saturated steam power generation.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A multi-source saturated steam waste heat power generation system is provided, comprising a steam header, a primary steam electric heater, a secondary steam electric heater, a steam desuperheater, and a steam turbine generator connected sequentially via insulated pipes; saturated steam from each source is connected to the steam header via steam branch pipes; the steam header is equipped with a steam flow meter, a first temperature measuring device, and a first pressure measuring device; the steam outlets of the primary and secondary steam electric heaters are each equipped with a second temperature measuring device and a second pressure measuring device; the steam outlet of the steam desuperheater is equipped with a third temperature measuring device and a third pressure measuring device.

[0007] In some optional embodiments, both the primary steam electric heater and the secondary steam electric heater are connected to a power controller. The power controller adjusts the temperature of the saturated steam by controlling the power of the heater based on the steam temperature detected by the second temperature measuring device.

[0008] In some alternative embodiments, the steam desuperheater is connected to a desuperheating water pipe, and the desuperheating water pipe is equipped with a desuperheating water regulating valve.

[0009] In some optional embodiments, both the primary steam electric heater and the secondary steam electric heater are connected in parallel with bypass pipes, and bypass valves are provided on the bypass pipes. Isolation valves are provided at the inlet and outlet of both the primary steam electric heater and the secondary steam electric heater.

[0010] In some alternative implementations, the bypass valve, isolation valve, and desuperheating water regulating valve are all electrically operated valves.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model utilizes a primary steam electric heater and a secondary steam electric heater to perform cascade heating of saturated steam, thereby increasing the steam temperature and avoiding the impact of excessive steam humidity on power generation efficiency and the potential water erosion impact on turbine blades. Furthermore, the system is equipped with temperature and pressure measuring points after the steam header, the primary steam electric heater, the secondary steam electric heater, and the steam desuperheater. Real-time monitoring of steam temperature and pressure provides guidance for system operation and enables precise control of the saturated steam heating temperature, ensuring stable steam inlet parameters for the turbine generator set and improving system safety. 2. The system is equipped with isolation valves, bypass pipes and bypass valves in the primary and secondary steam electric heaters. In the event of a failure in the electrode steam heater, the electrode steam heater can be isolated, ensuring the safe and stable operation of the entire system. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of the multi-steam-source saturated steam waste heat power generation system provided by this utility model.

[0013] The attached diagram lists the components represented by each number as follows: 1—Steam header, 2—First-stage steam electric heater, 3—Second-stage steam electric heater, 4—Steam desuperheater, 5—Steam turbine generator, 6—Steam flow meter, 7—First temperature measuring device, 8—First pressure measuring device, 9—Second temperature measuring device, 10—Second pressure measuring device, 11—Third temperature measuring device, 12—Third pressure measuring device, 13—Power controller, 14—Desuperheating water pipe, 15—Desuperheating water regulating valve, 16—Bypass pipe, 17—Bypass valve, 18—Isolation valve. Detailed Implementation

[0014] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., used in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. The terms "installed," "connected," and "joined" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model. Example

[0018] As attached Figure 1 As shown, this embodiment provides a multi-source saturated steam waste heat power generation system, including a steam header 1, a primary steam electric heater 2, a secondary steam electric heater 3, a steam desuperheater 4, and a steam turbine generator 5 connected in sequence via insulated pipes, wherein: The saturated steam from each gas source is connected to the steam header 1 through steam branch pipes; the steam header 1 is equipped with a steam flow meter 6, a first temperature measuring device 7, and a first pressure measuring device 8, which are used to monitor the steam flow, temperature, and pressure in the steam header in real time; the steam outlets of the first-stage steam electric heater 2 and the second-stage steam electric heater 3 are each equipped with a second temperature measuring device 9 and a second pressure measuring device 10, which are used to monitor the steam temperature and pressure after the first and second heating in real time, respectively; the steam outlet of the steam desuperheater 4 is equipped with a third temperature measuring device 11 and a third pressure measuring device 12, which are used to monitor the steam temperature and pressure after cooling in real time.

[0019] Preferably, in this embodiment, both the primary steam electric heater 2 and the secondary steam electric heater 3 are connected to a power controller 13. The two heaters adjust the temperature of the saturated steam by controlling the power of the power controller based on the steam temperature detected by the second temperature measuring device.

[0020] Preferably, the steam desuperheater 4 is connected to the desuperheating water pipe 14, and the desuperheating water pipe 14 is equipped with a desuperheating water regulating valve 15. The flow rate of desuperheating water entering the steam desuperheater is regulated by the desuperheating water regulating valve, and the opening degree of the desuperheating water regulating valve is guided by the steam temperature monitored by the third temperature measuring device.

[0021] Preferably, in this embodiment, both the primary steam electric heater 2 and the secondary steam electric heater 3 are provided with a bypass pipe 16 connected in parallel, and a bypass valve 17 is provided on the bypass pipe. Furthermore, both the inlet and outlet of the primary steam electric heater 2 and the secondary steam electric heater 3 are provided with isolation valves 18.

[0022] In this embodiment, the bypass valve 17, the isolation valve 18, and the desuperheating water regulating valve 15 are all electric valves.

[0023] Working principle: Saturated steam from multiple steam sources gathers in the steam header, and the steam flow rate, pressure, and temperature are monitored using flow meters, a first temperature measuring device, and a first pressure measuring device on the steam header. The saturated steam enters the first-stage steam electric heater to absorb heat, and the temperature and pressure of the steam after heat absorption are monitored using a second temperature measuring device and a second pressure measuring device. The heated steam enters the second-stage steam electric heater to absorb heat, further increasing the steam temperature, and the steam after the second heating is monitored by a second temperature measuring device and a second pressure measuring device. The first-stage and second-stage steam electric heaters regulate the steam temperature through power control via a power controller based on the heated steam temperature. When the steam temperature after the second heating exceeds the allowable value of the steam turbine generator, desuperheating water enters the steam desuperheater through a desuperheating water regulating valve to atomize and cool the steam. Finally, steam that meets the steam turbine generator inlet parameters enters the steam turbine to generate electricity.

[0024] When the primary or secondary steam electric heater experiences significant pressure loss or other malfunctions, it can be isolated using an electric isolation valve. The bypass valve on the bypass pipe will then open, allowing steam to be transported through the bypass pipe.

[0025] All of the above controls are automatically completed by the host computer in the control room.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-steam-source saturated steam waste heat power generation system, characterized in that: It includes a steam header, a primary steam electric heater, a secondary steam electric heater, a steam desuperheater, and a steam turbine generator, all connected in sequence via insulated pipes. The saturated steam from each gas source is connected to the steam header through steam branch pipes; The steam header is equipped with a steam flow meter, a first temperature measuring device, and a first pressure measuring device. Both the primary steam electric heater and the secondary steam electric heater are equipped with a second temperature measuring device and a second pressure measuring device at their steam outlet ends. The steam desuperheater is equipped with a third temperature measuring device and a third pressure measuring device at its steam outlet.

2. The multi-steam-source saturated steam waste heat power generation system according to claim 1, characterized in that: Both the primary steam electric heater and the secondary steam electric heater are connected to a power controller. Based on the steam temperature detected by the second temperature measuring device, the power controllers adjust the temperature of the saturated steam.

3. The multi-steam-source saturated steam waste heat power generation system according to claim 1, characterized in that: The steam desuperheater is connected to a desuperheating water pipe, and the desuperheating water pipe is equipped with a desuperheating water regulating valve.

4. The multi-steam-source saturated steam waste heat power generation system according to claim 3, characterized in that: Both the primary steam electric heater and the secondary steam electric heater are connected in parallel with bypass pipes, and bypass valves are installed on the bypass pipes. Isolation valves are installed at the inlet and outlet of both the primary steam electric heater and the secondary steam electric heater.

5. The multi-steam-source saturated steam waste heat power generation system according to claim 4, characterized in that: The bypass valve, isolation valve, and desuperheating water regulating valve are all electric valves.

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