Boiler water cooling wall temperature deviation adjusting system

By setting up a temperature regulating device on the inlet connection pipe of the upper water-cooled wall of the boiler and adjusting the working fluid temperature using temperature-regulating water, the problem of large temperature deviation of the upper water-cooled wall of the boiler at low load is solved, and precise temperature regulation and flexibility of boiler operation are achieved. Improved sex and safety.

CN222459481UActive Publication Date: 2025-02-11DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Patent Information

Application Number
CN202421259525.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-04
Publication Date
2025-02-11
Estimated Expiration
2034-06-04

AI Technical Summary

Technical Problem

Existing large-capacity supercritical Π type boilers are prone to large temperature deviations of the upper water-cooled wall during low loads, resulting in adverse consequences such as over-temperature explosion of water-cooled wall pipes and tearing of pipe screens.

Method used

A boiler water-cooled wall temperature deviation adjustment system is designed. By setting a temperature regulating device on the upper water-cooled wall inlet connection pipe, the temperature regulating water is drawn from the economizer outlet container or connecting pipe, and the temperature regulating water is connected to the upper water-cooled wall inlet container. The working fluid mixes, reduces the working fluid temperature, and adjusts the opening of the temperature-regulating water branch control valve through a temperature sensor to achieve accurate temperature adjustment.

Benefits of technology

It effectively reduces the high temperature peak of the upper water-cooled wall heating surface, reduces the temperature deviation of the heating surface, and improves the operation flexibility of boiler and the safety of low-load operation.

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Abstract

The utility model discloses a boiler water-cooled wall temperature deviation adjusting system which comprises an economizer connecting end, a temperature adjusting water header pipe, a temperature adjusting water branch pipe, a temperature adjusting device, an upper water-cooled wall inlet connecting pipe, an upper water-cooled wall inlet header and an upper water-cooled wall. The economizer connecting end is connected with a plurality of temperature-regulating water branch pipes through a temperature-regulating water main pipe and is used for leading out temperature-regulating water from the economizer; temperature adjusting devices are arranged at the tail ends of the temperature adjusting water branch pipes respectively, and the upper water cooling wall inlet connecting pipes are connected with upper water cooling wall inlet headers of the upper water cooling wall respectively and used for introducing working media into the upper water cooling wall; and the temperature adjusting devices are arranged on the inlet connecting pipes of the upper water cooling walls, or the temperature adjusting devices are arranged in the inlet collecting boxes of the upper water cooling walls. The problem of overlarge temperature deviation of the water cooling wall at the upper part of the boiler is solved by a simple, convenient and quick adjustment means of the system, the operation flexibility of the boiler is improved, and the low-load operation safety is improved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of power station boilers, and in particular relates to a boiler water-cooled wall temperature deviation regulating system. Background Art

[0002] After the "dual carbon" goal was proposed, the scale of installed capacity and power generation of new energy have grown rapidly. Due to the volatile, random and intermittent power generation characteristics of new energy, it has impacted the reliability and stability of the power system. The supporting and regulating role of coal-fired power will still be crucial in the long term.

[0003] Existing large-capacity supercritical II-type boilers generally adopt a lower spiral + middle mixing transition + upper vertical tube ring water-cooled wall structure. Affected by the structure and combustion mode, the travel of the lower spiral section entering the two middle mixing headers is not the same, and the heat absorption of each circuit is different, resulting in different enthalpy values ​​of the working fluid in the two middle mixing headers. The performance is more prominent at low load, and it is easy to have a large deviation in the left and right wall temperatures of the front wall of the upper water-cooled wall. Coupled with the increase in the deviation on the low-load flue gas side, in severe cases, it will lead to adverse consequences such as over-temperature explosion of the water-cooled wall tube and tearing of the tube screen.

[0004] In view of the existing problems, a temperature deviation adjustment system suitable for boiler water-cooled wall is urgently needed. Utility Model Content

[0005] The purpose of the utility model is to overcome the problems of the prior art and disclose a boiler water-cooled wall temperature deviation adjustment system. The utility model system solves the problem of excessive deviation of the boiler water-cooled wall temperature by simple and quick adjustment means, improves the flexibility of boiler operation, and improves the safety of low-load operation.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A boiler water-cooled wall temperature deviation adjustment system, the boiler water-cooled wall temperature deviation adjustment system comprising:

[0008] Economizer connection end, temperature regulating water main pipe, temperature regulating water branch pipe, temperature regulating device, upper water-cooled wall inlet connection pipe, upper water-cooled wall inlet header and upper water-cooled wall;

[0009] The economizer connection end is connected to a number of temperature-adjusting water branch pipes through the temperature-adjusting water main pipe, and is used to draw temperature-adjusting water from the economizer;

[0010] Each temperature-adjusting water branch pipe is provided with a temperature-adjusting device at its end.

[0011] The upper water-cooled wall inlet connecting pipes are respectively connected to the upper water-cooled wall inlet headers of the upper water-cooled wall, and are used to introduce working fluid into the upper water-cooled wall;

[0012] The temperature regulating device is arranged on each upper water-cooled wall inlet connecting pipe, or the temperature regulating device is arranged in each upper water-cooled wall inlet header.

[0013] According to a preferred embodiment, the upper water-cooled wall is externally connected to a plurality of upper water-cooled wall outlet headers, and each upper water-cooled wall outlet header is provided with a temperature sensor for completing temperature collection of each upper water-cooled wall outlet header.

[0014] According to a preferred embodiment, each outlet pipe section of the upper water-cooled wall is provided with a temperature sensing unit.

[0015] According to a preferred embodiment, a temperature regulating water main pipe shut-off valve is provided on the temperature regulating water main pipe.

[0016] According to a preferred embodiment, a temperature regulating water main pipe control valve is provided on the temperature regulating water main pipe.

[0017] According to a preferred embodiment, the temperature-adjusting water main pipe is connected to 20 to 40 temperature-adjusting water branch pipes.

[0018] According to a preferred embodiment, each temperature-adjusting water branch pipe is provided with a temperature-adjusting water branch pipe control valve.

[0019] According to a preferred embodiment, the economizer connection end is an economizer outlet header or a connecting pipe.

[0020] The utility model discloses a boiler water-cooled wall temperature deviation regulating system which draws out temperature regulating water from an economizer outlet header or a connecting pipe, introduces the temperature regulating water into a temperature regulating device through a temperature regulating water main pipe, mixes the temperature regulating water with the working medium in the upper water-cooled wall inlet connecting pipe, or directly mixes the temperature of the working medium in the upper water-cooled wall inlet header, reduces the working medium temperature in the upper water-cooled wall inlet header, and the working medium in the upper water-cooled wall inlet header exchanges heat with the high-temperature flue gas in the furnace through the upper water-cooled wall, and the heated working medium enters the upper water-cooled wall outlet header.

[0021] The system adjusts the opening of the thermostatic water branch pipe control valve through the temperature feedback of the temperature sensor or the temperature sensing unit. When the temperature sensor or the temperature sensing unit feedbacks that the temperature is too high, the opening of the thermostatic water branch pipe control valve is increased; when the temperature sensor or the temperature sensing unit feedbacks that the temperature is too low, the opening of the thermostatic water branch pipe control valve is reduced or the thermostatic water branch pipe control valve is closed.

[0022] The above-mentioned main scheme of the utility model and its further optional schemes can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the utility model. After understanding the scheme of the utility model, those skilled in the art can understand that there are many combinations based on the existing technology and common knowledge, all of which are technical schemes to be protected by the utility model, and they are not exhaustively listed here.

[0023] Beneficial effects of the utility model:

[0024] The boiler water-cooled wall temperature deviation adjustment system proposed by the utility model is to set a temperature adjustment device on the upper water-cooled wall inlet connecting pipe, draw temperature adjustment water from the economizer outlet header or connecting pipe to the temperature adjustment device, quickly and efficiently reduce the inlet working medium temperature of the high-temperature area of ​​the upper water-cooled wall heating surface, reduce the peak value of the heating surface outlet temperature, and reduce the temperature deviation of the heating surface. This adjustment method is simple to operate and improves the flexibility of boiler operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure corresponding to Embodiment 1 of the present utility model;

[0026] Figure 2 This is a schematic diagram of the structure corresponding to Embodiment 2 of the present utility model;

[0027] Among them, 1- economizer connection end, 2- temperature-adjusting water main pipe, 3- temperature-adjusting water main pipe shut-off valve, 4- temperature-adjusting water main pipe control valve, 5- temperature-adjusting water branch pipe, 6- temperature-adjusting water branch pipe control valve, 7- temperature-adjusting device, 8- upper water-cooled wall inlet connecting pipe, 9- upper water-cooled wall inlet header, 10- upper water-cooled wall, 11- upper water-cooled wall outlet header, 12- temperature sensor. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the present utility model should point out that, in the present utility model, if the specific structure, connection relationship, position relationship, power source relationship, etc. are not specifically written out, the structure, connection relationship, position relationship, power source relationship, etc. involved in the present utility model are all known by technical personnel in this field on the basis of existing technology without creative work.

[0034] Example 1

[0035] refer to Figure 1 As shown, a boiler water wall temperature deviation adjustment system is shown. In this embodiment, the boiler water wall temperature deviation adjustment system draws out temperature-adjusting water from the economizer outlet header or connecting pipe, and enters the temperature-adjusting water main pipe 2, which is further divided into 20 to 40 temperature-adjusting water branch pipes 5. The temperature-adjusting water in the temperature-adjusting water branch pipes 5 is mixed with the working medium in the upper water wall inlet connecting pipe 8 through the temperature-adjusting device 7 arranged on the corresponding upper water wall inlet connecting pipe 8, so as to reduce the working medium temperature in the corresponding upper water wall inlet header 9.

[0036] The working medium in the upper water-cooled wall inlet header 9 exchanges heat with the high-temperature flue gas in the furnace through the upper water-cooled wall 10, and the heated working medium enters the upper water-cooled wall outlet header 11. The opening of the temperature regulating water branch pipe control valve 6 is adjusted by the upper temperature sensor 12 arranged at different positions on the upper water-cooled wall outlet header 11.

[0037] When the temperature deviation of each area fed back by the temperature sensor 12 is large, the temperature control water branch pipe control valve 6 corresponding to the highest temperature area fed back by the temperature sensor 12 is opened, and the opening of the temperature control water branch pipe control valve 6 is adjusted according to the real-time temperature fed back by the temperature sensor 12, and the temperature control water branch pipe control valve 6 of other areas remains closed; when the temperature of the highest temperature area fed back by the temperature sensor 12 decreases, the temperature control water branch pipe control valve 6 of this area is closed. During the temperature control water adjustment process, the temperature control water main pipe shut-off valve 3 and the temperature control water main pipe control valve 4 remain open.

[0038] Example 2

[0039] refer to Figure 2 As shown, a boiler water wall temperature deviation adjustment system is shown. In this embodiment, temperature-adjusting water is drawn from the economizer outlet header or the connecting pipe and enters the temperature-adjusting water main pipe 2. The temperature-adjusting water main pipe 2 is further divided into 20 to 40 temperature-adjusting water branch pipes 5. The temperature-adjusting water in the temperature-adjusting water branch pipes 5 is mixed with the working medium in the upper water wall inlet header 9 through the temperature-adjusting device 7 arranged in the corresponding upper water wall inlet header 9, so as to reduce the working medium temperature in the upper water wall inlet header 9.

[0040] The working medium in the upper water-cooled wall inlet header 9 exchanges heat with the high-temperature flue gas in the furnace through the upper water-cooled wall 10, and the heated working medium enters the upper water-cooled wall outlet header 11. The opening of the temperature regulating water branch pipe control valve 6 is adjusted by the temperature sensors 12 arranged at different positions on the upper water-cooled wall outlet header 11.

[0041] When the temperature deviation of each area fed back by the temperature sensor 12 is large, the temperature control water branch pipe control valve 6 corresponding to the highest temperature area fed back by the temperature sensor 12 is opened, and the opening of the temperature control water branch pipe control valve 6 is adjusted according to the real-time temperature fed back by the temperature sensor 12, and the temperature control water branch pipe control valve 6 of other areas remains closed; when the temperature of the highest temperature area fed back by the temperature sensor 12 decreases, the temperature control water branch pipe control valve 6 of this area is closed. During the temperature control water adjustment process, the temperature control water main pipe shut-off valve 3 and the temperature control water main pipe control valve 4 remain open.

[0042] The utility model system is provided with a temperature regulating water temperature regulating device and a temperature regulating water pipeline on the upper water-cooled wall inlet connecting pipe, and accurately regulates the temperature of the upper water-cooled wall heating surface area with relatively high temperature, thereby reducing the high temperature peak value of the heating surface and the temperature deviation of the heating surface.

[0043] The utility model uses 20 to 40 thermostatic water branches to meet the requirements of precise temperature regulation along the four walls of the furnace perimeter, namely the front wall, the left front wall, the rear wall, and the right wall, thereby reducing the temperature deviation of the heating surfaces of the four walls. Furthermore, by providing a control valve group on the thermostatic water pipeline, the flow of thermostatic water entering each circuit area can be flexibly adjusted, thereby improving the flexibility of boiler operation.

[0044] In addition, by providing a temperature sensor on the upper water-cooled wall outlet header or tube panel, the temperature control branch pipe control valve group is adjusted in a targeted manner through the feedforward temperature of the temperature sensor, thereby improving the temperature control flexibility.

[0045] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler water wall temperature deviation adjustment system, characterized in that: The boiler water wall temperature deviation adjustment system comprises: Economizer connection end (1), temperature regulating water main pipe (2), temperature regulating water branch pipe (5), temperature regulating device (7), upper water-cooled wall inlet connection pipe (8), upper water-cooled wall inlet header (9) and upper water-cooled wall (10); The economizer connection end (1) is connected to a plurality of temperature-adjusting water branch pipes (5) via a temperature-adjusting water main pipe (2) and is used to draw temperature-adjusting water from the economizer; Each end of the temperature-adjusting water branch pipe (5) is provided with a temperature-adjusting device (7). The upper water-cooled wall inlet connecting pipe (8) is respectively connected to each upper water-cooled wall inlet header (9) of the upper water-cooled wall (10) and is used to introduce working fluid into the upper water-cooled wall (10); Furthermore, the temperature regulating device (7) is arranged on each upper water-cooled wall inlet connecting pipe (8), or the temperature regulating device (7) is arranged in each upper water-cooled wall inlet header (9).

2. The boiler water wall temperature deviation adjustment system according to claim 1, characterized in that: The upper water-cooled wall (10) is externally connected to a plurality of upper water-cooled wall outlet headers (11), and each upper water-cooled wall outlet header (11) is provided with a temperature sensor (12) for completing temperature collection of each upper water-cooled wall outlet header (11).

3. The boiler water wall temperature deviation adjustment system according to claim 1, characterized in that: Each outlet pipe section of the upper water-cooled wall (10) is provided with a temperature sensing unit.

4. The boiler water wall temperature deviation adjustment system according to claim 1, characterized in that: The temperature regulating water main pipe (2) is provided with a temperature regulating water main pipe shut-off valve (3).

5. The boiler water wall temperature deviation adjustment system according to claim 4, characterized in that: The temperature regulating water main pipe (2) is provided with a temperature regulating water main pipe control valve (4).

6. The boiler water wall temperature deviation adjustment system according to claim 1, characterized in that: The temperature regulating water main pipe (2) is connected to 20 to 40 temperature regulating water branch pipes (5).

7. The boiler water wall temperature deviation adjustment system according to claim 6, characterized in that: Each temperature-adjusting water branch pipe (5) is provided with a temperature-adjusting water branch pipe control valve (6).

8. The boiler water wall temperature deviation adjustment system according to claim 1, characterized in that: The economizer connection end (1) is an economizer outlet header or a connecting pipe.