Embedded temperature regulator of boiler economizer
By installing flue, regulating valve and guide plate in the boiler economizer to regulate the flue gas temperature, the problems of insufficient reaction temperature of the denitrification device and low-temperature corrosion at the tail end when the boiler is running at low load are solved, and the temperature can be controlled and the heating surface can be protected.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-10
AI Technical Summary
When the boiler is running at low load, the reaction temperature of the denitrification device is insufficient and the flue gas temperature is not constant, which leads to problems such as low-temperature condensation corrosion and blockage of the heating surface.
Flue gas ducts, regulating valves, and flue gas guide plates are arranged inside the boiler economizer. The flue gas temperature is controlled by opening and closing the regulating valves to ensure that the temperature entering the denitrification unit meets the reaction requirements and to prevent the tail temperature from being too low.
It enables controllable adjustment of the boiler economizer temperature, solves the problems of insufficient reaction temperature and low-temperature corrosion at the tail end of the denitrification unit, and avoids blockage of the heating surface.
Smart Images
Figure CN223985153U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of economizers for circulating fluidized bed boilers and stoker-fired boilers, and specifically relates to an embedded temperature regulator for a boiler economizer. Background Technology
[0002] Boiler economizer temperature control involves the control requirements of boiler denitrification temperature (SCR) and the problem of low-temperature corrosion at the tail end. Due to increasingly stringent national environmental standards for boilers, boiler designs now include SCR devices at the tail end to reduce NOx emission concentrations and meet environmental emission standards. The reaction temperature of these newly added SCR devices is generally 300℃-420℃. During low-load boiler operation, the flue gas temperature is not constant, causing the temperature entering the SCR device to fall below the catalyst's reaction temperature. Another issue arises when the boiler is operating at low load; the temperature of the flue gas entering the tail-end heating surfaces is too low, leading to low-temperature condensation corrosion and even blockage of the heating surfaces. Summary of the Invention
[0003] The purpose of this invention is to solve the problems of insufficient reaction temperature and excessively low tail temperature in denitrification devices (SCR), and to provide an embedded temperature regulator for boiler economizers. This regulator has a simple structure, is easy to process, has low cost, is reliable in operation, is easy to install, and is convenient to operate.
[0004] The technical solution adopted in this utility model is as follows:
[0005] The boiler economizer has an embedded temperature regulator, which is arranged inside the economizer and includes a flue, a regulating valve, and a flue gas guide plate. The flue is located inside the economizer, the regulating valve is located at the flue inlet, and the flue gas guide plate is located at the flue outlet.
[0006] The flue is a hollow flue made of steel plate and is located inside the economizer.
[0007] The regulating valve consists of a shaft, a bushing, a baffle, and a support seat. The baffle enables the regulating valve to open and close.
[0008] Two guide plates are arranged inside each flue.
[0009] The advantages of this utility model are:
[0010] 1. This utility model has a simple structure, is easy to process, convenient to install, easy to operate, and has low cost; 2. This utility model can realize the temperature regulation of the economizer; 3. This utility model can open or close some regulating valves as needed to control the flue gas emission temperature, thus solving the problems of insufficient reaction temperature and excessively low tail temperature of the denitrification device (SCR). Attached Figure Description
[0011] Figure 1 This is a diagram of the working environment of this utility model;
[0012] Figure 2 This is a schematic diagram of the overall structure of this utility model;
[0013] Figure 3 This is the left view of this utility model;
[0014] Figure 4 This is a front view of the regulating valve of this utility model;
[0015] Figure 5 This is a top view of the regulating valve of this utility model;
[0016] Figure 6 This is a schematic diagram of the working principle of this utility model. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings.
[0018] like Figure 1 As shown, the embedded temperature regulator of the boiler economizer is arranged inside the economizer 4, including regulating valve 1, flue 2, and guide plate 3. Regulating valve 1 is fixed at the inlet of flue 2, and guide plate 3 is fixed at the outlet of flue 2.
[0019] Depend on Figures 2 to 5 It can be seen that the regulating valve 1 is composed of a shaft 13, a bushing 12, a baffle 14 and a support seat 11. The support seat 11 is fixed on the flue 2, and the bushing 12 is fixed by the support seat 11. The bushing 12 and the shaft 13 are clearance-fitted. Both ends of the shaft 13 extend outside the flue 2. The baffle 14 is welded to the outside of the shaft 13. The baffle 14 is located inside the cavity of the flue 2, realizing the opening and closing of the flue 2 by the regulating valve 1. When the baffle 14 is in a horizontal state, the flue 2 is closed, and all the flue gas flows through the heating surface of the economizer 4. When the baffle 14 is in a vertical state, the flue gas enters the cavity flue, reducing the amount of flue gas on the heating surface of the economizer 4.
[0020] The flue 2 is a hollow flue made of steel plate and is located inside the economizer 4.
[0021] Depending on the temperature change and the size of the heating surface, multiple flues 2 can be set up inside the economizer 4, without being limited by space. There are two guide plates 3 at the outlet of each flue 2, which are symmetrically distributed on both sides of the flue 2 to evenly distribute the flue gas into the rear heating surface.
[0022] The working principle of this utility model is as follows:
[0023] A cavity flue is made inside the boiler economizer, and the opening and closing of the regulating valve is adjusted according to the boiler load to regulate the flue gas temperature of the economizer and meet the flue gas temperature requirements of the downstream section.
[0024] This invention regulates the temperature of the flue gas passing through the economizer of a boiler, making its temperature controllable. Figure 6 As shown, during boiler operation, flue gas passes through the economizer. With the regulating valve 1 open, the flue gas enters the flue duct 2. Since the flue duct 2 is a hollow flue duct, the heat exchange of the flue gas is relatively weakened, and the temperature of the flue gas does not drop significantly. After passing through the flue duct 2, the flue gas guide plate 3 set at the bottom of the flue duct diverts the flue gas and evenly enters the rear heating surface to meet the reaction temperature requirements of the denitrification device (SCR) and at the same time increase the temperature of the tail heating surface to prevent low-temperature corrosion.
Claims
1. A boiler economizer embedded temperature regulator characterized by: The adjusting valve (1) is composed of a shaft (13), a shaft sleeve (12), a baffle (14) and a supporting seat (11), the supporting seat (11) is fixed on the flue (2), the shaft sleeve (12) is fixed through the supporting seat (11), the shaft sleeve (12) is in clearance fit with the shaft (13), the shaft (13) extends out of the flue (2) at two ends, the baffle (14) is welded outside the shaft (13), and the baffle (14) is located in the cavity of the flue (2).
2. The boiler economizer embedded temperature regulator as claimed in claim 1, wherein: The flue (2) is a cavity flue made of a steel plate and located in the economizer (4).
3. The boiler economizer embedded temperature regulator according to claim 1 or 2, characterized in that: A plurality of flues (2) are arranged in the economizer (4), and the guide plates (3) at the outlets of each flue (2) are two and symmetrically distributed on the two sides of the flue (2).
4. The boiler economizer embedded temperature regulator according to claim 1 or 2, characterized in that: