Industrial steam parameter adjusting and energy recycling system based on steam turbine power generation
By directly receiving high-temperature and high-pressure steam and expanding it to perform work using a steam turbine generator set, combined with a fine-tuning water spray desuperheater and a desuperheating and pressure reducing device, the problems of energy waste and poor economy in steam parameter regulation are solved, and precise control and efficient utilization of steam parameters are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI TIANZHU IRON & STEEL GRP CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-04-17
AI Technical Summary
Existing steel and chemical enterprises suffer from energy waste and poor economic efficiency in steam parameter regulation. When high-temperature and high-pressure steam is throttled and depressurized through valves, energy is directly dissipated, and traditional desuperheating and depressurization devices result in high steam loss value.
The steam turbine generator set directly receives the inlet steam from the original desuperheating and pressure reducing device, and drives the generator through expansion work. Combined with the fine-tuning water spray desuperheater and desuperheating and pressure reducing device, the steam parameters are precisely adjusted to meet the process requirements and power generation requirements.
It achieves precise control of steam parameters, avoids energy waste, improves steam utilization efficiency, reduces steam loss, and significantly enhances economic efficiency.
Smart Images
Figure CN224135843U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an industrial steam parameter regulation and energy recovery system based on steam turbine power generation, which is applied to the steam pipeline system of high-energy-consuming enterprises such as steel and chemical industries, and belongs to the field of industrial energy recovery technology. Background Technology
[0002] Currently, steel and chemical enterprises generally use desuperheating and pressure reducing devices to regulate steam parameters: temperature ≤450℃, pressure ≤5MPa. This technology has two major drawbacks: 1. Energy waste: When high-temperature and high-pressure steam is throttled and depressurized through valves, about 15-30% of the available energy is directly dissipated; 2. Poor economic efficiency: The annual steam loss of a single unit exceeds one million yuan, based on a steam flow rate of 200t / h. Utility Model Content
[0003] The purpose of this invention is to provide an industrial steam parameter regulation and energy recovery system based on steam turbine power generation. The system uses a steam turbine generator set to directly receive the inlet steam from the original desuperheating and pressure reducing device. The generator is driven by expansion work, and the outlet steam is precisely reduced to the target parameter, thus meeting both process steam requirements and power generation, and solving the aforementioned problems in the background technology.
[0004] The technical solution of this utility model is:
[0005] An industrial steam parameter regulation and energy recovery system based on steam turbine power generation includes a main steam pipeline, a steam turbine generator set, a fine-tuning water spray desuperheater, a desuperheated main steam pipeline, and a desuperheating water supply pipeline. The main steam pipeline is connected to the inlet of the steam turbine generator set through a first pipe and a first valve. The outlet of the steam turbine generator set is connected to the desuperheated main steam pipeline through a second pipe and a second valve. A fine-tuning water spray desuperheater is installed on the second pipe and is connected to both the desuperheated main steam pipeline and the desuperheating water supply pipeline.
[0006] Furthermore, a desuperheating and pressure reducing device is provided between the main steam pipeline and the desuperheated main steam pipeline. The desuperheating and pressure reducing device is connected in parallel with the steam turbine generator set. Front and rear valves are provided on both sides of the desuperheating and pressure reducing device, and the desuperheating water supply pipeline is connected to the desuperheating and pressure reducing device.
[0007] The implementation process of this utility model:
[0008] Step 1: Close the front and rear valves of the original main steam pipeline desuperheating and pressure reducing device.
[0009] Step 2: The main steam in the main steam pipeline is led to the steam turbine generator set.
[0010] Step 3: After the steam is used to generate electricity, the exhaust is led to the desuperheated main steam pipeline.
[0011] The positive effects of this invention are: by using a steam turbine generator set to directly receive the inlet steam of the original desuperheating and pressure reducing device, the generator is driven by expansion work, and the outlet steam is accurately reduced to the target parameters, thus meeting the process steam requirements and power generation at the same time, and avoiding energy waste. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the system of this utility model;
[0013] In the diagram: 1. Main steam pipeline; 2. Steam turbine generator set; 3. Fine-tuning water spray desuperheater; 4. Desuperheating and pressure reducing device; 5. Main steam pipeline after desuperheating; 6. Generator; 7. PLC control system; 8. Desuperheating water supply pipeline. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0015] An industrial steam parameter regulation and energy recovery system based on steam turbine power generation includes a main steam pipeline 1, a steam turbine generator set 2, a fine-tuning water spray desuperheater 3, a desuperheated main steam pipeline 5, and a desuperheating water supply pipeline 8. The main steam pipeline 1 is connected to the inlet of the steam turbine generator set 2 through a first pipe and a first valve. The outlet of the steam turbine generator set 2 is connected to the desuperheated main steam pipeline 5 through a second pipe and a second valve. The second pipe is equipped with a fine-tuning water spray desuperheater 3, which is connected to both the desuperheated main steam pipeline 5 and the desuperheating water supply pipeline 8.
[0016] A desuperheating and pressure reducing device 4 is provided between the main steam pipeline 1 and the desuperheated main steam pipeline 5. The desuperheating and pressure reducing device 4 is connected in parallel with the steam turbine generator set 2. Front and rear valves are provided on both sides of the desuperheating and pressure reducing device 4. The desuperheating water supply pipeline 8 is connected to the desuperheating and pressure reducing device 4.
[0017] The steam turbine generator set 2 consists of multiple steam turbine generators. A steam turbine generator is a generator driven by a steam turbine, and is a well-known device in the art. Superheated steam generated by the boiler enters the steam turbine, expands, and does work, causing the blades to rotate and drive the generator to generate electricity.
[0018] This invention employs a back-pressure / extraction-back-pressure steam turbine to directly receive the inlet steam (typical parameters: 3.5-10MPa, 400-550℃) from the original desuperheating and pressure reducing device. The turbine then drives a generator through expansion, precisely reducing the outlet steam to the target parameters (e.g., 0.8-1.5MPa, 180-220℃), thus simultaneously meeting the process steam requirements and power generation needs.
[0019] Pressure closed-loop control: The outlet steam pressure is kept stable (±0.05MPa) by adjusting the generator load through frequency conversion (instead of traditional valve throttling).
[0020] Temperature Coordination Control: A fine-tuning water spray desuperheater is installed at the turbine outlet as an auxiliary measure, reducing the desuperheating water volume by more than 60%. The fine-tuning water spray desuperheater 3 is a well-known device in the art, achieving temperature regulation by spraying atomized cooling water into the superheated steam. A parallel traditional desuperheating and pressure-reducing bypass (with an electrically operated quick-opening valve) is retained, switching steam supply within 0.5 seconds in the event of a fault in turbine generator set 2.
[0021] In this embodiment, a 6MW back-pressure steam turbine generator set is installed to replace the original desuperheating and pressure reducing device. A PLC control system (pressure sensor + generator excitation regulator) is configured to control valve one, valve two, upstream and downstream valves, and the steam turbine generator. The steam in the main steam pipeline 1, at 9.8MPa / 540℃, is desuperheated and pressure reduced to 1.3MPa / 210℃ by the steam turbine generator set 2. Tests show that the annual power generation of the steam turbine generator set 2 is 42 million kWh (equivalent to saving 15,000 tons of coal), with steam parameter control accuracy of ±0.03MPa pressure and ±2℃ temperature, and an investment payback period of <3 years.
Claims
1. An industrial steam parameter adjustment and energy recovery system based on steam turbine power generation, characterized by: It includes a main steam pipe (1), a steam turbine generator set (2), a fine-tuning water spray desuperheater (3), a desuperheated main steam pipe (5), and a desuperheating water supply pipe (8). The main steam pipe (1) is connected to the inlet of the steam turbine generator set (2) through a pipe and a valve. The outlet of the steam turbine generator set (2) is connected to the desuperheated main steam pipe (5) through a pipe and a valve. A fine-tuning water spray desuperheater (3) is provided on the pipe. The fine-tuning water spray desuperheater (3) is connected to the desuperheated main steam pipe (5) and the desuperheating water supply pipe (8) respectively.
2. The industrial steam parameter adjustment and energy recovery system based on steam turbine power generation according to claim 1, characterized in that: A de-cooling and pressure-reducing device (4) is provided between the main steam pipeline (1) and the de-cooled main steam pipeline (5). The de-cooling and pressure-reducing device (4) is connected in parallel with the steam turbine generator set (2). Front and rear valves are provided on both sides of the de-cooling and pressure-reducing device (4). The de-cooling water supply pipeline (8) is connected to the de-cooling and pressure-reducing device (4).