6F-grade gas-steam combined cycle direct-discharge heat supply system
By adding a temperature reduction and pressure reduction device at the waste heat boiler outlet of the 6F gas steam combined cycle unit, the problem of insufficient heating capacity is solved, and the heating capacity is rapidly improved, the anti-interference ability of the heat network is enhanced, and the heating interruption is avoided .
Patent Information
- Application Number
- CN202421268197.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing 6F gas steam combined cycle units have problems such as insufficient heating capacity and poor anti-interference ability in heating mode, which cannot meet the growing demand for heat load, and are prone to heat interruption or short-term partial interruption.
A one-way temperature reduction and pressure reduction device is added to the outlet end of the waste heat boiler of the gas-fired steam combined cycle unit. The steam is processed directly to the user by reducing the temperature and reducing the pressure, and the heating capacity of the unit is improved.
It realizes rapid increase in heating capacity when the heating capacity is insufficient, avoids heating interruptions or short-term partial interruptions, and improves the anti-interference ability of the thermal network.
Smart Images
Figure CN222315236U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas turbines, in particular to a 6F-level gas-steam combined cycle direct-discharge heating system. Background Art
[0002] A gas turbine is a rotary machine that converts chemical energy into mechanical energy through combustion. Its main working principle is to compress external air through a compressor, and then mix the compressed air with gas in a combustion chamber to generate high-speed flow of gas to drive the impeller to rotate, and finally drive the generator to rotate to generate electricity.
[0003] Gas-steam combined cycle refers to a form of operation in which a gas turbine is combined with a steam turbine. The high-temperature flue gas exhausted from the gas turbine after work is passed through a waste heat boiler for heat exchange to generate high-temperature and high-pressure steam, which is then introduced into the steam turbine to work. The thermal energy of the flue gas is ultimately converted into mechanical energy of the steam turbine, which ultimately drives the generator to generate electricity.
[0004] Traditional thermal power plants mainly provide external heating by extracting steam from the unit, providing external heating by reheating steam from the unit, providing external heating by exhaust steam from the back pressure machine, and providing external heating by heating boilers. Among them, gas power plants provide external heating by combined cycle and gas boilers. With the increasing attention paid to environmental protection in my country, it has become a major trend to replace coal with clean energy. Under this situation, gas heating has developed rapidly. There is no precedent for the use of direct exhaust heating from the gas turbine to operate steam open externally in 6F gas-steam combined cycle units at home and abroad. Utility Model Content
[0005] In order to solve the above problems, the utility model aims to propose a 6F-level gas-steam combined cycle direct exhaust heating system. By adding a temperature reduction and pressure reduction device at the outlet end of the waste heat boiler of the gas-steam combined cycle unit, when the heating capacity cannot meet the heating load, the steam is supplied to the user after being cooled and reduced in pressure, thereby achieving the purpose of improving the heating capacity of the unit.
[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:
[0007] A 6F-class gas-steam combined cycle direct-discharge heating system comprises a gas-steam combined cycle unit, wherein an additional pipeline is provided at the outlet end of the waste heat boiler of the gas-steam combined cycle unit, a temperature and pressure reducer is provided in the pipeline, and the end of the pipeline is connected to a heat user.
[0008] Furthermore, the gas-steam combined cycle unit comprises a gas turbine, a waste heat boiler, a steam turbine and a condenser connected in sequence.
[0009] Furthermore, compressed air and fuel gas are introduced into the combustion chamber of the gas turbine.
[0010] Furthermore, the waste heat boiler is connected to the gas turbine for receiving high-temperature flue gas exhausted after the gas turbine performs work.
[0011] Beneficial effect: The gas turbine direct exhaust heating operation mode of the utility model is the full-cut heating of the combined cycle steam turbine unit; the steam generated by the normal combined cycle waste heat boiler all enters the steam turbine to do work. The utility model adds a temperature reduction and pressure reduction device at the outlet of the waste heat boiler. When the heating capacity cannot meet the heating load, the steam is supplied to the user after being cooled and reduced in pressure, thereby achieving the purpose of improving the heating capacity of the unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:
[0013] Figure 1 It is an overall schematic diagram of a 6F-class gas-steam combined cycle direct-discharge heating system according to an embodiment of the utility model;
[0014] Figure 2 This is a schematic diagram of a 6F-class gas-steam combined cycle direct-discharge heating system described in an embodiment of the utility model. DETAILED DESCRIPTION
[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0016] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0017] Glossary: 6F-class gas turbine: It is classified according to the combustion temperature of the gas turbine, 1100℃ is E-class, 1200℃ is F-class, and 1400℃ is H-class.
[0018] The existing gas-steam combined cycle power plant mainly uses steam turbine extraction for heating or new gas boilers for external heating. The existing heating forms have limited heat supply and cannot meet the growing heat load demand. They also have poor anti-interference capabilities and are prone to complete or short-term partial interruptions in external heating.
[0019] Example 1
[0020] Based on the above defects of the prior art, see Figure 1-2: A 6F-level gas-steam combined cycle direct-discharge heating system in this embodiment includes a gas-steam combined cycle unit, and an additional pipeline is provided at the outlet end of the waste heat boiler 1 of the gas-steam combined cycle unit, a temperature and pressure reducer 2 is provided in the pipeline, and the end of the pipeline is connected to a heat user 3.
[0021] The gas turbine direct exhaust heating operation mode of this embodiment is that the combined cycle steam turbine unit is fully cut off for heating; the steam generated by the normal combined cycle waste heat boiler all enters the steam turbine to do work. This embodiment adds a temperature reduction and pressure reduction device at the outlet of the waste heat boiler. When the heating capacity cannot meet the heating load, the steam is supplied to the user after being cooled and reduced in pressure, thereby achieving the purpose of improving the heating capacity of the unit.
[0022] In a specific example, the gas-steam combined cycle unit is a gas turbine 4, a waste heat boiler 1, a steam turbine 5 and a condenser 6 connected in sequence.
[0023] In a specific example, compressed air and fuel gas are introduced into the combustion chamber of the gas turbine 4 .
[0024] In a specific example, the waste heat boiler 1 is connected to the gas turbine to receive the high-temperature flue gas discharged after the gas turbine 4 performs work.
[0025] It should be noted that there is no precedent for using direct exhaust heating from a gas turbine to supply steam to the outside for heating in 6F gas-steam combined cycle units at home and abroad. When the maximum heating load is reached, it takes a certain amount of time for the standby thermal station boiler (or start-up boiler) to heat up and pressurize and be incorporated into the heating network. The heating network has poor anti-interference capabilities and is prone to complete or short-term partial interruption of external heating. Direct exhaust heating can quickly increase the heating capacity.
[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A 6F-class gas-steam combined cycle direct exhaust heating system, characterized in that: It comprises a gas-steam combined cycle unit, wherein a pipeline is additionally provided at the outlet end of a waste heat boiler (1) of the gas-steam combined cycle unit, a temperature reducer (2) is provided in the pipeline, and the end of the pipeline is connected to a heat user (3).
2. The 6F-class gas-steam combined cycle direct exhaust heating system according to claim 1 is characterized in that: The gas-steam combined cycle unit comprises a gas turbine (4), a waste heat boiler (1), a steam turbine (5) and a condenser (6) which are connected in sequence.
3. The 6F-class gas-steam combined cycle direct exhaust heating system according to claim 2 is characterized in that: Compressed air and fuel gas are introduced into the combustion chamber of the gas turbine (4).
4. The 6F-class gas-steam combined cycle direct exhaust heating system according to claim 2 is characterized in that: The waste heat boiler (1) is connected to the gas turbine and is used to receive high-temperature flue gas discharged after the gas turbine (4) performs work.