50MW supercritical CO2 coal-fired power generation turbine
Through the design of the outer cylinder and inner cylinder and the pre-torque assembly structure, the problems of lax sealing of supercritical carbon dioxide turbine and working fluid leakage under high temperature and high pressure are solved, and efficient sealing and low loss CO2 coal-fired power turbine operation are achieved.
Patent Information
- Application Number
- CN202423133101.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Supercritical carbon dioxide turbine technology faces problems of lax sealing and leakage of end gas sealing work fluid in high temperature and high pressure environments.
The outer cylinder and inner cylinder design are adopted. A dry air sealing device is installed at both ends of the outer cylinder, which is connected to the bearing box through cat claws. The inner cylinder is fixed by supporting keys. The dynamic and static vane adopts a pre-torque assembly structure, and an end cooling structure is set at the dry air seal to reduce the temperature.
Improve the flow efficiency, reduce working fluid leakage, ensure sealing effect, and reduce the risk of air intake loss and temperature exceeding the standard.
Smart Images
Figure CN223119983U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a 50MW supercritical CO2 coal-fired power generation turbine. Technical Background
[0002] For coal-fired power generation systems, the supercritical carbon dioxide Brayton cycle has advantages such as high power generation efficiency and small system volume compared to the traditional steam Rankine cycle. However, although supercritical carbon dioxide turbine technology has many advantages, in practical applications, it still faces problems such as poor sealing under high-temperature and high-pressure parameters and working medium leakage at the end seals. Summary of the Utility Model
[0003] The purpose of the utility model is to solve the problems of poor sealing under high-temperature and high-pressure environments and working medium leakage at the end seals in practical applications, and provide a 50MW supercritical CO2 coal-fired power generation turbine.
[0004] To solve the above deficiencies, the utility model adopts the following technical solutions:
[0005] A 50MW supercritical CO2 coal-fired power generation turbine, which consists of an outer cylinder and an inner cylinder. At both the front and rear ends of the outer cylinder, a set of dry gas seal devices are provided. At the horizontal middle planes at both the front and rear ends of the outer cylinder, it is connected to the front bearing box and the rear bearing box through cat's paws, and at the same time, a guiding key is provided for axial guiding. The front bearing box is fixedly installed on the base frame through bolts. A thrust bearing is installed inside the front bearing box. The rear bearing box maintains a sliding relationship with the base frame to meet the expansion requirements of the unit. At both the left and right ends of the outer cylinder, a set of main gas regulating combined valves are fixedly connected through flanges respectively. The inner cylinder is fixedly installed inside the outer cylinder through support keys on the horizontal middle reverse side and is connected to the main gas regulating combined valve through an intake insertion pipe.
[0006] In the 50MW supercritical CO2 coal-fired power generation turbine, a solid-forged rotor is connected above the bearings inside the front bearing box and the rear bearing box. Moving blades are fixedly installed on the solid-forged rotor, and the moving blades adopt a pre-twisted assembled structure.
[0007] In the 50MW supercritical CO2 coal-fired power generation turbine, stationary blades are fixedly installed on the inner cylinder, and the stationary blades adopt a pre-twisted assembled structure.
[0008] In the 50MW supercritical CO2 coal-fired power generation turbine, an end cooling structure is provided at the connection between the dry gas seal device and the outer cylinder, and a low-temperature cooling gas is injected into the end cooling structure. Advantageous Effects
[0009] 1. The flow passage of this utility model adopts a multi-stage small enthalpy drop reaction type design, which fundamentally improves the flow passage efficiency. All the stationary blades and moving blades adopt a pre-twisted assembled structure. Compared with the traditional welded diaphragm, the assembled structure has no weld seams, avoiding welding deformation and better ensuring the flow passage accuracy.
[0010] 2. The seal of this utility model adopts a dry gas seal structure form, which has good sealing effect and effectively prevents carbon dioxide leakage.
[0011] 3. The outer cylinder of this utility model is connected to the two bearing boxes through the cat's paw and guiding key structure. The expansion dead points of the rotor and stator are both located at the front bearing box. Such a setting can enable the static and dynamic components to expand towards the same side, reducing the gap between the static and dynamic parts.
[0012] 4. This utility model directly connects the main gas regulating combined valve to the outer cylinder through a flange, reducing the gas guide pipe structure. The outer cylinder is tangential volute intake, reducing the intake loss.
[0013] 5. When CO2 enters the inner cylinder through the main gas regulating combined valve in this utility model, after flowing through the flow passage and doing work, it is discharged from the exhaust port at the lower part of the outer cylinder. Dry gas seals are designed at both ends of the outer cylinder, which can effectively reduce the leakage loss and prevent CO2 from leaking into the atmosphere. Brief Description of the Drawings
[0014] Attached Figure 1 is the structural schematic diagram of this utility model;
[0015] Attached Figure 2 is the longitudinal sectional view of this utility model;
[0016] Attached Figure 3 is the schematic diagram of the connection between the valve and the inner and outer cylinders of this utility model;
[0017] Attached Figure 4 is the partial sectional view of this utility model;
[0018] Attached Figure 5 is the solid schematic diagram of the inner cylinder of this utility model;
[0019] Attached Figure 6 is the solid schematic diagram of the outer cylinder of this utility model;
[0020] Attached Figure 7 is the reaction type pre-twisted assembled blade of this utility model.
[0021] In the figure: 1. Front bearing box; 2. Inner cylinder; 3. Outer cylinder; 4. Dry gas seal device; 5. Rear bearing box; 6. Integrally forged rotor; 7. Cooling structure; 8. Main gas regulating combined valve; 9. Stationary and moving blades; 10. Base frame. Detailed Description of the Preferred Embodiment
[0022] Refer to Figure 1-7, a 50MW supercritical CO2 coal-fired power generation turbine, which consists of an outer cylinder 3 and an inner cylinder 2. At both the front and rear ends of the outer cylinder, a set of dry gas seal devices 4 are provided. At the horizontal middle planes at both the front and rear ends of the outer cylinder, it is connected to the front bearing housing 1 and the rear bearing housing 5 through cat's paws, and a guiding key is also provided for axial guiding. The front bearing housing is fixedly installed on the base frame 10 through bolts, and a thrust bearing is installed inside the front bearing housing. The rear bearing housing maintains a sliding relationship with the base frame to meet the expansion requirements of the unit. At both the left and right ends of the outer cylinder, a set of main gas regulating combined valves 8 are fixedly connected through flanges respectively. The inner cylinder is fixedly installed inside the outer cylinder through support keys on the horizontal middle reverse side and is connected to the main gas regulating combined valve through an intake insertion pipe.
[0023] The outer cylinder adopts an integral cylindrical cylinder, and both ends are sealed tightly through vertical flanges, solving the problem of poor sealing of the outer cylinder with the conventional upper and lower half structure when the exhaust pressure is too high.
[0024] The inner cylinder has a volute intake form, effectively reducing intake losses; the upper and lower halves adopt a structure sealed tightly by a shrink-fit ring, effectively solving the problem of poor sealing of the middle plane when the cylinder pressure is too high.
[0025] The high-temperature and high-pressure carbon dioxide enters the inner cylinder through the main gas regulating combined valve directly connected to the outer cylinder, and is discharged from the exhaust port after flowing through and expanding to do work.
[0026] For the 50MW supercritical CO2 coal-fired power generation turbine, a solid-forged rotor 6 is connected above the bearings inside the front bearing housing and the rear bearing housing, and moving blades 9 are fixedly installed on the solid-forged rotor. The moving blades adopt a pre-twisted assembled structure.
[0027] For the 50MW supercritical CO2 coal-fired power generation turbine, static blades 9 are fixedly installed on the inner cylinder. The static blades adopt a pre-twisted assembled structure.
[0028] The expansion dead points of both the rotor and the stator are located at the front bearing housing. Such a setting can enable the static and moving components to expand towards the same side, reducing the gap between the static and moving parts.
[0029] The pre-twisted assembled structure refers to realizing pre-twisting during the assembly of small enthalpy drop blades. Because the blade profile of small enthalpy drop blades is relatively narrow and the number of flow passages increases, the flow efficiency can be fundamentally improved.
[0030] For the 50MW supercritical CO2 coal-fired power generation turbine, an end cooling structure 7 is provided at the connection between the dry gas seal device and the outer cylinder, and low-temperature cooling gas is injected into the end cooling structure.
[0031] Because the existing dry gas seal technology requires an operating temperature below 250°C, while the turbine exhaust temperature of this unit is 505°C, far exceeding the operating conditions of the dry gas seal, an end cooling structure is therefore set up to lower the end temperature to reach the operating temperature.
Claims
1. A 50MW supercritical CO2 coal-fired power generation turbine, which comprises an outer cylinder and an inner cylinder, and is characterized in that: A set of dry gas seal devices is arranged at each of the front and rear ends of the outer cylinder. The front and rear ends of the outer cylinder are connected to the front bearing box and the rear bearing box through cat's paws at the horizontal mid-sections. Meanwhile, guiding keys are provided for axial guidance. The front bearing box is fixedly installed on the base frame through bolts. A thrust bearing is installed in the front bearing box. The rear bearing box has a sliding relationship with the base frame to meet the expansion requirements of the unit. A set of main gas regulating combined valves is fixedly connected to each of the left and right ends of the outer cylinder through flanges. The inner cylinder is fixedly installed in the outer cylinder through support keys at the horizontal mid-reverse side and is connected to the main gas regulating combined valve through an intake insertion pipe.
2. A 50MW supercritical CO2 coal-fired power generation turbine according to claim 1, characterized in that: The integral forging rotor is connected above the bearings in the front bearing box and the rear bearing box. Moving blades are fixedly installed on the integral forging rotor. The moving blades adopt a pre-twisted assembled structure.
3. A 50MW supercritical CO2 coal-fired power generation turbine according to claim 1, characterized in that: The inner cylinder fixedly installs stationary blades. The stationary blades adopt a pre-twisted assembled structure.
4. A 50MW supercritical CO2 coal-fired power generation turbine according to claim 1, characterized in that: An end cooling structure is arranged at the connection between the dry gas seal device and the outer cylinder. Low-temperature cooling gas is injected into the end cooling structure.