Low-temperature economizer device adapting to flexible transformation
Through the low-temperature economizer device with multi-modular design and intelligent control system, the problem of poor adaptability of traditional low-temperature economizers under low load is solved, efficient use of flue gas waste heat and ash accumulation prevention is achieved, and the adaptability and energy-saving effect of the equipment is improved.
Patent Information
- Application Number
- CN202422185277.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-06
AI Technical Summary
Traditional low-temperature economizers have poor adaptability and flexibility when dealing with different working conditions and load changes, and cannot adapt to the utilization of waste heat of flue gas under low temperature and low load conditions, and there are problems of heat exchange area ash and blockage.
The low-temperature economizer device with a multi-modular design is adopted, combined with an intelligent control system and a high-precision adjustment device, and through the cooperation of the baffle and the motor, the precise adjustment of the flue gas flow rate and thermal energy recovery parameters can be achieved to adapt to operating conditions and load changes.
It improves the heat energy recovery efficiency of low-temperature economizers under low loads, reduces energy waste and equipment ash accumulation, reduces production costs, and enhances the adaptability and flexibility of equipment.
Smart Images
Figure CN223191597U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of waste heat recovery, and in particular relates to a low-temperature economizer device that is adaptable to flexibility transformation. Background Art
[0002] During the operation of thermal power plants, the flue gas emitted by boilers is at a high temperature and contains a large amount of waste heat. To prevent the waste heat from being discharged, wasting energy and burdening the environment, waste heat boilers and other measures are often installed to recover the waste heat from the flue gas and reduce energy loss. A low-temperature economizer is a device installed in the tail flue of the boiler to recover waste heat from the exhaust gas. Although traditional low-temperature economizers can recover waste heat from the flue gas, they lack adaptability and flexibility when dealing with different operating conditions and load changes, and are unable to adapt to the utilization of waste heat from the flue gas under low-temperature and low-load conditions. Utility Model Content
[0003] In response to the shortcomings of the existing technology, the utility model provides a low-temperature economizer device that is adaptable to flexible transformation. It adopts a multi-modular design and can be flexibly combined and adjusted according to changes in actual working conditions and load conditions, thereby achieving efficient operation of the low-temperature economizer under low load (20% to 30%) and solving the problems of dust accumulation and blockage on the heat exchange surface under ultra-low load.
[0004] The utility model is realized through the following technical solutions:
[0005] duct, and the like. The heat exchanger tube bundle is connected to the heat exchanger tube bundle by the heat exchanger inner tube and the heat exchanger inner tube is connected to the heat exchanger tube bundle by the heat exchanger inner tube. The heat exchanger tube bundle is arranged horizontally in the box body. Baffle bins are provided on both sides of the heat exchanger tube bundle, and the baffle bins are respectively located on one side of the box body close to the flue gas inlet interface and the flue gas outlet interface. There is more than one working module in the box body from top to bottom, and the working modules divide the heat exchanger tube bundle into multiple areas from top to bottom. The working module includes a motor and a baffle, and the motor is arranged at the baffle bins on both sides of the heat exchanger tube bundle. One side of the baffle in the length direction is connected to the rotating shaft of the motor, the length of the baffle is the same as the side length of the heat exchanger tube bundle, and the width of the baffle is half the height of the working module.
[0006] Preferably, the heat exchanger tube bundle is of countercurrent heat exchange type.
[0007] Preferably, the motor is connected to an external control system.
[0008] Preferably, the bottoms of the smoke inlet interface and the smoke outlet interface are both designed to be nearly horizontal, wherein the side of the smoke inlet interface close to the smoke inlet is upturned, and the side of the smoke outlet interface close to the smoke outlet is upturned.
[0009] Preferably, a temperature transmitter is provided at the flue gas inlet and is connected to an external control system.
[0010] Preferably, the width of the baffle bin matches the width of the baffle.
[0011] Preferably, the box body is provided with one or more orifice plates for fixing the heat exchanger tube bundle in the box body, and the orifice plates are arranged vertically in the box body and parallel to the direction of the flue gas.
[0012] The beneficial effects of the utility model are as follows:
[0013] (1) Modular design: The low-temperature economizer device of this utility model adopts a modular design. Each working module has an independent heat exchange unit and control system. The heat exchange unit of each working module can be controlled by a baffle. It is convenient for users to flexibly combine and adjust according to actual needs.
[0014] (2) Intelligent Control: The low-temperature economizer device of this utility model is connected to a control system. The control system uses advanced algorithms and sensor transmitter technology to monitor the operating status and flue gas parameters of the boiler in real time, and performs calculations and control based on set input values and calculated values. The control system automatically adjusts the operating status of the low-temperature economizer based on the predicted results to ensure that it is always in the optimal heat recovery state.
[0015] (3) Precise Adjustment: The low-temperature economizer device of the present invention is equipped with an adjustment device. The adjustment device uses a high-precision temperature transmitter and an actuator (motor baffle) to achieve precise adjustment of parameters such as the water flow rate and temperature of the low-temperature economizer. This not only improves the efficiency of heat recovery, but also reduces energy waste and equipment loss.
[0016] (4) High efficiency and energy saving: The low-temperature economizer device of this utility model can fully utilize the waste heat of flue gas through precise adjustment and intelligent control. Compared with traditional low-temperature economizers, this utility model can adjust the flue gas velocity according to the workload of the economizer, avoiding the accumulation of dust in the device that affects the overall heat exchange effect of the equipment, saving more energy, reducing production costs, and reducing the impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Front view of the low-temperature economizer unit with the damper fully open to accommodate flexibility modification;
[0018] Figure 2Front view of the low-temperature economizer unit with the damper fully closed to accommodate flexibility modification;
[0019] Figure 3 A top view of the low-temperature economizer unit modified to accommodate flexibility;
[0020] In the figure: 100, box body; 101, flue gas inlet; 102, flue gas inlet interface; 103, baffle bin; 104, flue gas outlet interface; 105, flue gas outlet; 106, orifice plate; 200, motor; 201, first baffle; 202, second baffle; 203, third baffle; 204, fourth baffle; 205, fifth baffle; 206, sixth baffle; 300, heat exchanger tube bundle; 301, condensate inlet; 302, condensate outlet. DETAILED DESCRIPTION
[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0022] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions for the implementation of the utility model, and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", and "middle" quoted in the embodiments of this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the utility model without substantially changing the technical content.
[0023] Example 1
[0024] A low-temperature economizer device adapted for flexibility modification, such as Figure 1 、 3As shown, it includes a box body 100 and a heat exchanger tube bundle 300; a flue gas inlet 101 and a flue gas outlet 105 are respectively provided on the left and right sides of the box body 100, the flue gas inlet 101 is connected to the box body 100 via a flue gas inlet interface 102, and the flue gas outlet 105 is connected to the box body 100 via a flue gas outlet interface 104; the heat exchanger tube bundle 300 is horizontally arranged in the box body 100 and stacked layer by layer from top to bottom; baffle bins 103 are provided on both sides of the heat exchanger tube bundle 300, and the baffle bins 103 are respectively located in the box body 100 near the flue gas inlet interface 102 and the flue gas outlet interface 104; a plurality of working modules with the same structure are arranged in the box body 100 from top to bottom, and the working modules divide the heat exchanger tube bundle 300 into a plurality of areas from top to bottom; the working modules include a motor 200 and a baffle, and the motor 200 is arranged on both sides of the heat exchanger tube bundle 300 and fixed on the box wall where the baffle bin 103 is located (which can be located on the outer wall of the box body 100); one side of the baffle in the length direction is connected to the rotating shaft of the motor 200, the length of the baffle is the same as the side length of the heat exchanger tube bundle 300, the width of the baffle is half of the height of the working module, and the baffle is located in the baffle bin 103.
[0025] like Figure 1 、 3 As shown, in this embodiment, there are three working modules from top to bottom, and the baffles include a first baffle 201, a second baffle 202, a third baffle 203, a fourth baffle 204, a fifth baffle 205, and a sixth baffle 206, all of which are controlled by corresponding motors 200. The width of the baffle bin 103 matches the width of the baffles.
[0026] like Figure 3 As shown, a plurality of orifice plates 106 are provided in the box body 100. The aperture of the orifice plates 106 matches the tube diameter of the heat exchanger tube bundle 300 and is used to fix the heat exchanger tube bundle 300 in the box body 100 by welding. The orifice plates 106 are arranged vertically perpendicular to the box body 100 and parallel to the direction of the flue gas. Two adjacent orifice plates 106 are arranged parallel to each other.
[0027] like Figure 1 、 3 As shown, the heat exchanger tube bundle 300 in this embodiment employs a countercurrent heat exchange type, meaning the water flows in the opposite direction of the flue gas. Flue gas enters through the flue gas inlet 101 and is discharged through the flue gas outlet 105. Correspondingly, condensate enters through the condensate inlet 301 and is discharged through the condensate outlet 302. This design improves the heat exchange efficiency of the economizer while also reducing the area available for dust accumulation in the low-temperature economizer due to the vertically downward orientation of the heat exchanger fins, which are perpendicular to the finned tubes.
[0028] In this embodiment, a temperature transmitter is provided at the flue gas inlet 101. The temperature transmitter and the motor 200 are both connected to an external control system. The temperature transmitter monitors the operating status and flue gas parameters of the boiler in real time. The control system calculates the economizer load based on the flue gas parameters, and adjusts the economizer operating status by adjusting the corresponding baffle through the motor 200 to control the flue gas flow rate, thereby ensuring that the low-temperature economizer operates in an optimal heat recovery state and that the main equipment does not accumulate ash.
[0029] Specifically, the control system has a built-in precise calculation system, which can accurately calculate the boiler flue gas volume based on the fuel composition and the boiler air input; the flue gas flow rate is calculated based on the boiler exhaust volume, the exhaust temperature (feedback from the temperature transmitter), and the economizer flue gas flow cross-sectional area; the calculated flue gas flow rate is fed back to the control system, and the control system must ensure that the flue gas flow rate after cooling is greater than the system set value. The system flow rate setting value is set according to the economizer anti-ash flow rate (based on the dust content of the flue gas); the flue gas flow cross-sectional area is input with relevant values according to the economizer design. When the flow rate is less than the set value, the controller controls the motor 200 to rotate the baffle, controls the single working module of the economizer, and then controls the overall heat exchange area of the low-temperature economizer, reduces the flue gas flow cross-sectional area of the economizer, and increases the flue gas flow rate.
[0030] like Figure 1 As shown, the bottoms of the flue gas inlet interface 102 and the flue gas outlet interface 104 in this embodiment are both designed to be nearly horizontal, wherein the flue gas inlet interface 102 is upturned on the side close to the flue gas inlet 101, and the flue gas outlet interface 104 is upturned on the side close to the flue gas outlet 105. This design is conducive to the flow of flue gas to carry away the accumulated ash at the bottom.
[0031] The operating process of the low-temperature economizer device adapted to the flexibility modification is as follows: Figure 1-3 The specific steps are as follows:
[0032] The control system monitors the operating status and flue gas parameters of the boiler in real time and calculates the load change of the low-temperature economizer based on these data. When the low-temperature economizer load is 100% BMCR (maximum continuous evaporation capacity of the boiler), assuming that the design flue gas velocity is 10m / s, the damper is controlled by the motor 200 to be in the following position: Figure 1The state shown (fully open state) is when the heat exchange area of the low-temperature economizer is the largest; when the low-temperature economizer load is at 75-100% BMCR, the control system gives priority to controlling the motor 200 and simultaneously stops controlling the first baffle 201 and the second baffle 202. The first baffle 201 and the second baffle 202 are closed under the action of gravity, and the heat exchange area of the first working module and the flue gas flow area, the minimum wind speed can be increased from 7.5m / s to 9m / s; similarly, when the low-temperature economizer is at 45-75% BMCR, the control system further controls the motor 200 and simultaneously closes the third baffle 203 and the fourth baffle 204 to reduce the heat exchange area and the flue gas flow area of the second working module, and the minimum wind speed can be increased from 4.5m / s to 6.75m / s; when the low-temperature economizer is at 20-45% BMCR, the control system further controls the motor 200 and simultaneously closes the third baffle 203 and the fourth baffle 204 to reduce the heat exchange area and the flue gas flow area of the second working module, and the minimum wind speed can be increased from 4.5m / s to 6.75m / s. In BMCR working condition, the control system further controls the motor 200 to close the fifth damper 205 and the sixth damper 206 at the same time, reducing the heat exchange area and the flue gas flow area of the third working module. Figure 2 In the state shown (fully closed state), the minimum wind speed can be increased from 2m / s to 4m / s.
[0033] On the contrary, when the low-temperature economizer load increases from 20-45% BMCR to 45-75% BMCR, the control system preferentially controls the motor 200 to open the fifth damper 205 and the sixth damper 206 to increase the heat exchange area of the low-temperature economizer; when the BMCR increases further, the operation can be carried out in the same way.
[0034] The device of this embodiment reduces energy waste and prevents dust accumulation and clogging of the economizer caused by flue gas flow rate. While adjusting the baffle, the regulating device precisely adjusts parameters such as the water flow rate and temperature of the low-temperature economizer according to the control system's instructions to achieve optimal heat recovery.
[0035] The embodiments described above are only some of the embodiments of the present invention, not all of them. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. The scope of protection of the present invention shall be based on the scope required by the claims. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work shall fall within the scope of protection of the present invention.
Claims
1. A low-temperature economizer device adapted for flexibility modification, characterized in that: The heat exchanger comprises a box body and a heat exchanger tube bundle; a smoke inlet and a smoke outlet are respectively provided on the left and right sides of the box body, the smoke inlet is connected to the box body through a smoke inlet interface, and the smoke outlet is connected to the box body through a smoke outlet interface; the heat exchanger tube bundle is horizontally arranged in the box body; baffle bins are provided on both sides of the heat exchanger tube bundle, and the baffle bins are respectively located on one side of the box body close to the smoke inlet interface and the smoke outlet interface; there is more than one working module provided in the box body from top to bottom, and the working module divides the heat exchanger tube bundle into multiple areas from top to bottom; the working module comprises a motor and a baffle, and the motor is arranged at the baffle bins on both sides of the heat exchanger tube bundle; one side of the baffle in the length direction is connected to the rotating shaft of the motor, the length of the baffle is the same as the side length of the heat exchanger tube bundle, and the width of the baffle is half the height of the working module.
2. A low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: The heat exchanger tube bundle is of countercurrent heat exchange type.
3. A low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: The motor is connected to an external control system.
4. A low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: The bottoms of the smoke inlet interface and the smoke outlet interface are both designed to be nearly horizontal, wherein the side of the smoke inlet interface close to the smoke inlet is upturned, and the side of the smoke outlet interface close to the smoke outlet is upturned.
5. The low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: A temperature transmitter is provided at the flue gas inlet and is connected to an external control system.
6. A low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: The width of the baffle bin matches the width of the baffle.
7. The low-temperature economizer device adapted for flexibility modification according to claim 1, characterized in that: The box body is provided with one or more orifice plates for fixing the heat exchanger tube bundle in the box body. The orifice plates are arranged vertically in the box body and parallel to the direction of the flue gas.