Economizer system capable of preventing outlet medium from being vaporized
By introducing high-pressure heaters, temperature control valves and other components into the economizer system, automatic adjustment of water supply temperature and emergency exhaust are achieved, which solves the problem of water-cooled wall overtemperature caused by economizer vaporization and improves the safety and stability of the boiler.
Patent Information
- Application Number
- CN202422409816.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-30
AI Technical Summary
When the load is reduced by 1000mw unit, the non-boiling H-type fin economizer is prone to vaporization problems, which leads to overtemperature of the heated surface of the water-cooled wall and affects the safe operation of the boiler.
An economizer system for anti-export medium vaporization is designed, including water inlet pipe, graded economizer, intermediate pipe, main economizer, boiler water-cooled wall and water-cooled wall outlet mixed concentrator. By setting up components such as high-pressure heater, temperature regulating valve, cooling branch pipe, water volume regulating valve, check valve, emergency exhaust pipe and electric stop valve, automatic adjustment of water supply temperature and emergency exhaust to avoid the occurrence of vaporization.
It effectively improves the safety of boiler operation, prevents the economizer working fluid from vaporizing, protects the water-cooled wall heating surface, and ensures the safe and stable operation of the boiler.
Smart Images
Figure CN223294808U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boilers, and in particular relates to an outlet medium vaporization prevention economizer system. Background Art
[0002] The 1000MW unit uses twelve stages of steam extraction and heat recovery, raising the feedwater temperature to 330°C and significantly improving the unit's economic efficiency. The unit also uses a non-boiling H-shaped finned economizer with a large heat storage capacity. When the unit's load drops below 50%, the steam pressure decreases, and the economizer is prone to vaporization problems, leading to severe overheating of the water-wall heating surface and seriously affecting the safe operation of the boiler. Utility Model Content
[0003] In view of this, the purpose of the present invention is to provide an economizer system for preventing outlet medium vaporization, so as to improve the safety of boiler operation.
[0004] The utility model solves the above problems through the following technical means:
[0005] An anti-outlet medium vaporization economizer system comprises a water inlet pipe, a staged economizer, an intermediate pipe, a main economizer, a boiler water-cooled wall and a water-cooled wall outlet mixing and collecting box, wherein the water inlet end of the staged economizer is connected to the water inlet pipe, and the water outlet end of the staged economizer is connected to the water inlet end of the main economizer through the intermediate pipe; the water outlet end of the main economizer is connected to the water inlet end of the boiler water-cooled wall, and the water outlet end of the boiler water-cooled wall is connected to the water-cooled wall outlet mixing and collecting box; a high-pressure heater is provided on the water inlet pipe, and a temperature regulating valve is provided on the steam heating pipe of the high-pressure heater.
[0006] Furthermore, the water inlet pipe is connected to the intermediate pipe through a cooling branch pipe, and a water regulating valve is provided on the cooling branch pipe.
[0007] Furthermore, a check valve is provided on the cooling branch pipe.
[0008] Furthermore, the water outlet end of the main economizer is connected to the water-cooled wall outlet mixing and concentration box through an emergency exhaust pipe.
[0009] Furthermore, an electric stop valve is provided on the emergency exhaust pipe.
[0010] Furthermore, a water pump is provided on the water inlet pipe.
[0011] Beneficial effects of the utility model:
[0012] The present application provides an anti-outlet medium vaporization economizer system, comprising a water inlet pipe, a staged economizer, an intermediate pipe, a main economizer, a boiler water wall, and a water wall outlet mixing and concentrating box. The water inlet end of the staged economizer is connected to the water inlet pipe, and the water outlet end of the staged economizer is connected to the water inlet end of the main economizer via the intermediate pipe. The water outlet end of the main economizer is connected to the water inlet end of the boiler water wall, which is connected to the water wall outlet mixing and concentrating box. The water inlet pipe is provided with a high-pressure heater, and the steam heating pipe of the high-pressure heater is provided with a thermostatic valve. The use of the anti-outlet medium vaporization economizer system of the present application effectively improves the safety of boiler operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0014] Figure 1 It is a schematic diagram of a preferred embodiment of the present utility model. DETAILED DESCRIPTION
[0015] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1 The present invention's outlet medium vaporization prevention economizer system includes a water inlet pipe 8, a staged economizer 12, an intermediate pipe 11, a main economizer 3, a boiler water wall 2, and a water wall outlet mixing and concentrating tank 1. The water inlet of the staged economizer is connected to the water inlet pipe, while the water outlet of the staged economizer is connected to the water inlet of the main economizer via the intermediate pipe. The water outlet of the main economizer is connected to the water inlet of the boiler water wall, which in turn is connected to the water wall outlet mixing and concentrating tank. A high-pressure heater 9 is installed on the water inlet pipe, and a thermostatic valve 10 is installed on the steam heating pipe of the high-pressure heater. The water inlet pipe is connected to the intermediate pipe via a cooling branch pipe 6, which is equipped with a water flow regulating valve 4 and a check valve 5. The water outlet of the main economizer is connected to the water wall outlet mixing and concentrating tank via an emergency exhaust pipe 14. The emergency exhaust pipe is equipped with an electric shut-off valve 13. A feedwater pump is installed on the water inlet pipe.
[0016] This application first adds a temperature control valve to the steam heating pipe of the high-pressure heater, which can automatically adjust the opening of the temperature control valve according to the subcooling degree of the working fluid at the outlet of the main economizer, reduce the steam volume of the steam heating pipe, and thus lower the feed water temperature entering the staged economizer to avoid vaporization of the economizer working fluid.
[0017] Then a cooling branch is set up between the staged economizer and the main economizer. When the adjustment of the temperature control valve cannot control the supercooling of the working medium at the economizer outlet, the water flow regulating valve of the cooling branch is automatically opened to reduce the feed water temperature entering the main economizer and avoid vaporization of the working medium in the economizer.
[0018] Finally, an emergency exhaust pipe is arranged at the water outlet of the economizer, and an electric shut-off valve is installed on the emergency exhaust pipe. When vaporization occurs in the economizer, the electric shut-off valve will automatically open to exhaust the air, protecting the safe operation of the boiler.
[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. An economizer system for preventing outlet medium vaporization, characterized in that: It includes a water inlet pipe, a graded economizer, an intermediate pipe, a main economizer, a boiler water-cooled wall and a water-cooled wall outlet mixing and collecting box. The water inlet end of the graded economizer is connected to the water inlet pipe, and the water outlet end of the graded economizer is connected to the water inlet end of the main economizer through the intermediate pipe; the water outlet end of the main economizer is connected to the water inlet end of the boiler water-cooled wall, and the water outlet end of the boiler water-cooled wall is connected to the water-cooled wall outlet mixing and collecting box; a high-pressure heater is provided on the water inlet pipe, and a temperature regulating valve is provided on the steam heating pipe of the high-pressure heater.
2. The outlet medium vaporization prevention economizer system according to claim 1, characterized in that: The water inlet pipe is connected to the intermediate pipe through a cooling branch pipe, and a water regulating valve is provided on the cooling branch pipe.
3. The outlet medium vaporization prevention economizer system according to claim 2, characterized in that: The cooling branch pipe is also provided with a check valve.
4. The outlet medium vaporization prevention economizer system according to claim 3, characterized in that: The water outlet end of the main economizer is connected to the water-cooled wall outlet mixing and concentration box through an emergency exhaust pipe.
5. The outlet medium vaporization prevention economizer system according to claim 4, characterized in that: The emergency exhaust pipe is provided with an electric stop valve.
6. The outlet medium vaporization prevention economizer system according to claim 5, characterized in that: A water pump is provided on the water inlet pipe.