阅读说明：本技术 一种超超临界塔式锅炉高温受热面管壁温度测量系统 (Ultra-supercritical tower boiler high-temperature heating surface pipe wall temperature measuring system ) 是由 李兆祥 于 2019-11-21 设计创作，主要内容包括：本发明涉及一种超超临界塔式锅炉高温受热面管壁温度测量系统,所述系统包括监控终端、屏式过热器、二级过热器、末级过热器和末级再热器；所述屏式过热器布置于炉膛出口高温区；所述二级过热器布置于高温再热器烟气下游,与烟气成逆流布置；所述末级过热器布置于屏式过热器烟气下游,高温再热器烟气上游,与烟气成顺流布置；所述末级再热器布置于三级过热器烟气下游,与烟气成顺流布置；所述屏式过热器、二级过热器、末级过热器和末级再热器将采集的数据传送至监控终端。本发明能很好地反映管子的壁温偏差和超温,有效解决壁温测点测量结果与实际管壁温度不相符的问题。(The invention relates to a system for measuring the temperature of a pipe wall of a high-temperature heated surface of an ultra-supercritical tower boiler, which comprises a monitoring terminal, a platen superheater, a secondary superheater, a final superheater and a final reheater, wherein the monitoring terminal is connected with the monitoring terminal; the screen type superheater is arranged in a high-temperature area at the outlet of the hearth; the secondary superheater is arranged at the downstream of the flue gas of the high-temperature reheater and is arranged in a countercurrent manner with the flue gas; the final superheater is arranged at the downstream of the flue gas of the platen superheater and at the upstream of the flue gas of the high-temperature reheater, and is arranged downstream of the flue gas; the final-stage reheater is arranged at the downstream of the flue gas of the tertiary superheater and is arranged downstream of the flue gas of the tertiary superheater; and the platen superheater, the secondary superheater, the final superheater and the final reheater transmit the acquired data to a monitoring terminal. The invention can well reflect the wall temperature deviation and the overtemperature of the pipe and effectively solve the problem that the measurement result of the wall temperature measuring point does not accord with the actual pipe wall temperature.)

1. The utility model provides an ultra supercritical tower boiler high temperature heating surface pipe wall temperature measurement system which characterized in that: the system comprises a monitoring terminal, a platen superheater, a secondary superheater, a final superheater and a final reheater; the screen type superheater is arranged in a high-temperature area at the outlet of the hearth; the secondary superheater is arranged at the downstream of the flue gas of the high-temperature reheater and is arranged in a countercurrent manner with the flue gas; the final superheater is arranged at the downstream of the flue gas of the platen superheater and at the upstream of the flue gas of the high-temperature reheater, and is arranged downstream of the flue gas; the final-stage reheater is arranged at the downstream of the flue gas of the tertiary superheater and is arranged downstream of the flue gas of the tertiary superheater; and the platen superheater, the secondary superheater, the final superheater and the final reheater transmit the acquired data to a monitoring terminal.

2. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 1, characterized in that: the screen type superheater comprises 20 screen type superheaters which are uniformly distributed along the width of a hearth, and has the transverse pitch of 960mm and the longitudinal pitch of 58 mm.

3. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 2, characterized in that: each screen of the screen type superheater is composed of 12 tubes, and the number of the tube screens is defined from bottom to top, so that the tube No. 1 represents the outermost ring of tubes, and the tube No. 12 represents the innermost ring of tubes; 12 th tubes, 15 th tubes and 12 th tubes from the left of the screen type superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 1 st, 10 th and 20 th screens, and the 6 th tube of each screen is provided with a furnace outer wall temperature measuring point.

4. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 1, characterized in that: the 20 final superheaters are uniformly arranged along the width of the hearth, the transverse pitch is 960mm, and the longitudinal pitch is 60 mm.

5. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 4, wherein: each tube panel of the final superheater is composed of 40 tubes, and the number of the tube panels is defined from bottom to top, so that the No. 1 tube represents the outermost ring tube, and the No. 40 tube represents the innermost ring tube; the 40 th, the 12 th and the 40 th of the 5 th, the 8 th, the 40 th and the 15 th from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 5 th and the 15 th screens, and the 21 st tube of each screen is provided with a furnace outer wall temperature measuring point.

6. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 1, characterized in that: the final-stage reheaters are 40 in number, are uniformly distributed along the width of the hearth, and have the transverse pitch of 480mm and the longitudinal pitch of 100 mm.

7. The system for measuring the temperature of the pipe wall of the high-temperature heating surface of the ultra-supercritical tower boiler according to claim 6, wherein: each heating surface of the final-stage reheater consists of 23 tubes; each tube panel is composed of 23 tubes, and the number of the tube panels is defined from bottom to top, so that the tube No. 1 represents the outermost ring tube, and the tube No. 23 is the innermost ring tube; the 23 th, 23 rd, 23 th, 23 nd, 20 th, 23 rd, 30 th, 23 rd and 23 th of the 15 th tubes from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, and the 12 th tube of each tube panel is provided with the furnace outer wall temperature measuring point.

Technical Field

The invention relates to the technical field of electric power, in particular to a system for measuring the temperature of a pipe wall of a high-temperature heating surface of an ultra-supercritical tower boiler.

Background

The tube burst of the high-temperature heating surface of the large boiler is one of important factors causing the forced shutdown of a unit, and most of tubes are caused by the overtemperature of the tube wall, so that the running state of the heating surface and the safety of the boiler can be correctly judged by accurately grasping the wall temperature distribution condition of the high-temperature heating surface. With the development of power station boilers to large-capacity and high-parameter units, the distribution deviation of the flue gas velocity and the flue gas temperature on the inlet section of each high-temperature heating surface is larger and larger, so that the heat absorption deviation between parallel screen plates of the heating surface and parallel pipes of the same screen and the wall temperature difference born by the pipe wall are larger and larger. For monitoring the tube wall of the high-temperature heating surface of the large-scale boiler and predicting the service life, it is important to know the temperature distribution of all parts of the tube. Because the temperature of the steam flowing through the tube is continuously increased, the temperature of the flue gas outside the tube is unevenly distributed along the cross section of the flue and continuously transfers heat along the flow direction of the flue gas, the temperature of each part in the tube is different, and the temperature of some tube sections is higher than the average temperature in the whole tube. In order to monitor and guide the operation condition of the boiler at any time, optimize the operation and avoid overtemperature, the modern large-scale power station boiler is provided with a plurality of temperature measuring points on the surface of the pipe wall of a high-temperature heating surface to measure the temperature of steam in the pipe and judge the thermal deviation of a pipe group in the boiler and the wall temperature of the pipe in the boiler according to the temperature. However, the number of wall temperature measuring points of the heating surface of the existing operating ultra-supercritical unit boiler is small, and the number of measuring points outside the boiler is large, and the wall temperature deviation and the excess temperature of the pipe cannot be well reflected by the arrangement of the existing measuring points, particularly the situations of foreign body blockage and scale centralized stripping blockage occur.

Disclosure of Invention

In view of this, the present invention provides a system for measuring a temperature of a tube wall of a high-temperature heating surface of an ultra-supercritical tower boiler, which effectively solves the problem that a measurement result of a wall temperature measurement point does not match an actual tube wall temperature.

In order to achieve the purpose, the invention adopts the following technical scheme:

a system for measuring the temperature of the tube wall of a high-temperature heating surface of an ultra-supercritical tower boiler comprises a monitoring terminal, a platen superheater, a secondary superheater, a final superheater and a final reheater; the screen type superheater is arranged in a high-temperature area at the outlet of the hearth; the secondary superheater is arranged at the downstream of the flue gas of the high-temperature reheater and is arranged in a countercurrent manner with the flue gas; the final superheater is arranged at the downstream of the flue gas of the platen superheater and at the upstream of the flue gas of the high-temperature reheater, and is arranged downstream of the flue gas; the final-stage reheater is arranged at the downstream of the flue gas of the tertiary superheater and is arranged downstream of the flue gas of the tertiary superheater; and the platen superheater, the secondary superheater, the final superheater and the final reheater transmit the acquired data to a monitoring terminal.

Furthermore, the screen type superheaters are 20 in total and are uniformly distributed along the width of the hearth, the transverse pitch is 960mm, and the longitudinal pitch is 58 mm.

Furthermore, each screen of the screen type superheater is composed of 12 tubes, and the number of the tube screens is defined from bottom to top, so that the tube No. 1 represents the outermost tube circle, and the tube No. 12 represents the innermost tube circle; 12 th tubes, 15 th tubes and 12 th tubes from the left of the screen type superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 1 st, 10 th and 20 th screens, and the 6 th tube of each screen is provided with a furnace outer wall temperature measuring point.

Furthermore, 20 final superheaters are uniformly arranged along the width of the hearth, the transverse pitch is 960mm, and the longitudinal pitch is 60 mm.

Furthermore, each tube panel of the final superheater is composed of 40 tubes, and the number of the tube panels is defined from bottom to top, so that the tube No. 1 represents the outermost ring tube, and the tube No. 40 is the innermost ring tube; the 40 th, the 12 th and the 40 th of the 5 th, the 8 th, the 40 th and the 15 th from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 5 th and the 15 th screens, and the 21 st tube of each screen is provided with a furnace outer wall temperature measuring point.

Furthermore, the number of the final-stage reheaters is 40, the final-stage reheaters are uniformly distributed along the width of the hearth, the transverse pitch is 480mm, and the longitudinal pitch is 100 mm.

Further, each heated surface of the final reheater is composed of 23 tubes; each tube panel is composed of 23 tubes, and the number of the tube panels is defined from bottom to top, so that the tube No. 1 represents the outermost ring tube, and the tube No. 23 is the innermost ring tube; the 23 th, 23 rd, 23 th, 23 nd, 20 th, 23 rd, 30 th, 23 rd and 23 th of the 15 th tubes from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, and the 12 th tube of each tube panel is provided with the furnace outer wall temperature measuring point.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can well reflect the wall temperature deviation and the overtemperature of the pipe and effectively solve the problem that the measurement result of the wall temperature measuring point does not accord with the actual pipe wall temperature.

2. Once the temperature measuring points inside or outside the furnace fail, one of the measuring points can still be used for monitoring the wall temperature.

Drawings

FIG. 1 is a schematic view of the arrangement of a high temperature heating surface in one embodiment of the present invention

FIG. 2 is a schematic view of a platen superheater wall temperature measurement point arrangement in an embodiment of the present invention;

FIG. 3 is a schematic diagram of the arrangement of wall temperature measuring points of a secondary superheater in one embodiment of the invention;

FIG. 4 is a schematic diagram of the arrangement of finishing superheater wall temperature measurement points in an embodiment of the present invention;

FIG. 5 is a simplified diagram of secondary reheater wall temperature measurement point placement in accordance with an embodiment of the present invention;

FIG. 6 is a graph showing the history of the outside wall temperature of tube furnaces Nos. 1, 21 and 40 for different tube panels of a finishing superheater in accordance with an embodiment of the present invention;

FIG. 7 is a graph showing the history of the wall temperature of the same platen for the finishing superheater in accordance with an embodiment of the present invention.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

Referring to fig. 1, in the embodiment, two 660MW ultra-supercritical tower boilers are constructed in the first stage of engineering of the huanengo project, and the arrangement of the high-temperature heating surface is shown in fig. 1. A system for measuring the temperature of the tube wall of a high-temperature heating surface of an ultra-supercritical tower boiler comprises a monitoring terminal, a platen superheater, a secondary superheater, a final superheater and a final reheater; the screen type superheater is arranged in a high-temperature area at the outlet of the hearth; the secondary superheater is arranged at the downstream of the flue gas of the high-temperature reheater and is arranged in a countercurrent manner with the flue gas; the final superheater is arranged at the downstream of the flue gas of the platen superheater and at the upstream of the flue gas of the high-temperature reheater, and is arranged downstream of the flue gas; the final-stage reheater is arranged at the downstream of the flue gas of the tertiary superheater and is arranged downstream of the flue gas of the tertiary superheater; and the platen superheater, the secondary superheater, the final superheater and the final reheater transmit the acquired data to a monitoring terminal.

In this embodiment, as shown in fig. 2, the platen superheaters have 20 sheets, which are uniformly distributed along the width of the furnace, and have a transverse pitch of 960mm and a longitudinal pitch of 58 mm. Each screen of the screen type superheater is composed of 12 tubes, and the number of the tube screens is defined from bottom to top, so that the tube No. 1 represents the outermost ring of tubes, and the tube No. 12 represents the innermost ring of tubes; 12 th tubes, 15 th tubes and 12 th tubes from the left of the screen type superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 1 st, 10 th and 20 th screens, and the 6 th tube of each screen is provided with a furnace outer wall temperature measuring point.

In this embodiment, as shown in FIG. 3, the finishing superheaters are uniformly arranged in 20 sheets along the width of the furnace, and have a transverse pitch of 960mm and a longitudinal pitch of 60 mm. Each tube panel of the final superheater is composed of 40 tubes, and the number of the tube panels is defined from bottom to top, so that the No. 1 tube represents the outermost ring tube, and the No. 40 tube represents the innermost ring tube; the 40 th, the 12 th and the 40 th of the 5 th, the 8 th, the 40 th and the 15 th from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, furnace outer wall temperature measuring points are arranged at the outlets of all the tubes of the 5 th and the 15 th screens, and the 21 st tube of each screen is provided with a furnace outer wall temperature measuring point.

In the present embodiment, as shown in fig. 4, the number of the final reheaters is 40, and the final reheaters are uniformly distributed along the width of the furnace, and have a transverse pitch of 480mm and a longitudinal pitch of 100 mm. Each heating surface of the final-stage reheater consists of 23 tubes; each tube panel is composed of 23 tubes, and the number of the tube panels is defined from bottom to top, so that the tube No. 1 represents the outermost ring tube, and the tube No. 23 is the innermost ring tube; the 23 th, 23 rd, 23 th, 23 nd, 20 th, 23 rd, 30 th, 23 rd and 23 th of the 15 th tubes from the left of the final superheater are respectively provided with furnace inner and outer wall temperature measuring points, and the 12 th tube of each tube panel is provided with the furnace outer wall temperature measuring point.

Referring to fig. 6 and 7, in the present embodiment, along the width direction of the furnace, the furnace outer wall temperature of the final superheater exhibits a double hump curve, the tube panel wall temperatures on two sides are the lowest, the left peak appears near the 7 th panel, and the right peak appears near the 15 th panel. The high temperature of the final superheater and the shielding pipe outside the furnace occurs in No. 27-30 pipes, the low temperature occurs in No. 40 pipes, and the temperature difference between the two is about 20-30 ℃.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.