CN216925292U

CN216925292U - Leakage detection device for flue gas heat exchanger

Info

Publication number: CN216925292U
Application number: CN202220004863.6U
Authority: CN
Inventors: 张吉祥; 王伟; 焦永静; 赵江翔
Original assignee: Beijing Londian Hongtai Environmental Technology Co ltd
Current assignee: Beijing Londian Hongtai Environmental Technology Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-07-08
Anticipated expiration: 2032-01-05

Abstract

The utility model relates to a leakage detection device for a flue gas heat exchanger, which consists of a plurality of flue gas leakage detecting rods and a controller. The smoke leakage detection rod is internally provided with a plurality of temperature sensor probes; the controller is arranged outside the flue, is connected with the temperature sensor and processes the detected temperature signal. The utility model can quickly and effectively detect the leakage condition of the flue gas heat exchanger by detecting the temperature of the flue gas at the tail part of the flue gas heat exchanger. The utility model has simple structure, stable and safe operation, electricity saving, high detection accuracy and wide application range, and is particularly suitable for the leakage detection of low-temperature economizers, waste heat heaters and flue gas temperature intensifiers.

Description

Leakage detection device for flue gas heat exchanger

Technical Field

The utility model belongs to the energy-saving and environment-friendly field of high-temperature flue gas industries such as electric power, metallurgy, chemical industry and building materials, and particularly relates to a leakage detection device of a flue gas heat exchanger.

Background

In the industries of electric power, metallurgy, chemical industry, building materials and the like, the temperature of the discharged flue gas is higher, so that part of heat loss is caused. The heat loss of the exhaust smoke is the largest one of various heat losses in the industry.

Taking a power plant as an example, generally, when a large and medium power station boiler normally operates, the heat loss of exhaust gas accounts for 4% -8% of the fuel input heat of the boiler; and the efficiency of the boiler can be improved by about 1 percent when the exhaust gas temperature is reduced by 15-25 ℃. With the continuous deepening of energy-saving work in China and the continuous rising of the coal price at present, people attach more and more importance to the problem of energy waste caused by high exhaust gas temperature, and a small number of power plants begin to try to utilize a flue gas heat exchange device to reduce the temperature of the exhaust gas by 20-50 ℃ and obtain primary effect. In addition, the flue gas heat exchange devices are arranged at different positions of the flue gas, so that the flue gas temperature can be further reduced, heat and water vapor in the flue gas can be recovered, the phenomenon of 'white smoke' of the desulfurized flue gas can be eliminated, the dust removal efficiency of the dust remover is improved, and meanwhile, the energy, water and white smoke can be saved, so that multiple social and economic benefits are achieved.

The flue gas heat exchanger is the main equipment for realizing the heat exchange of flue gas, and the arrangement structure and the arrangement position of the flue gas heat exchanger in a flue are generally determined according to the layout on site. Because the flue gas heat exchanger is generally arranged in a flue, if leakage occurs, the safe operation of the whole unit can be influenced, so that the leakage can be found in time, and effective measures can be taken as early as possible, which is particularly important for the waste heat recovery heat exchanger.

In view of the above, the utility model innovatively designs the leakage detection device of the flue gas heat exchanger with a novel structure, which can effectively and timely detect the leakage condition of the flue gas heat exchanger, ensure the safe operation of the unit and has more advancement, economy and practicability.

Disclosure of Invention

The utility model aims to provide a leakage detection device of a flue gas heat exchanger with a novel structure, and the device can effectively and timely detect the leakage condition of the flue gas heat exchanger, ensure the safe operation of a unit, and has advancement, economy and practicability through engineering operation verification.

The purpose and the technical problem to be solved of the utility model are realized by adopting the following technical scheme. The utility model provides a leakage detection device for a flue gas heat exchanger, which consists of a flue gas leakage detection rod and a controller; the flue on the leeward side of the flue gas heat exchanger is internally provided with a plurality of flue gas leakage detecting rods, and a plurality of temperature sensor probes are arranged in the flue gas leakage detecting rods; the controller is arranged outside the flue, is connected with the temperature sensor and processes the detected temperature signal.

The aim and the technical problem to be solved by the utility model are further realized by adopting the following technical measures:

in the leakage detection device for the flue gas heat exchanger, one end of the flue gas leakage detection rod extends out of the flue and is connected with the controller.

In the aforementioned leakage detection device for a flue gas heat exchanger, the plurality of temperature sensors of the flue gas leakage probe arranged in the flue are all connected with the controller.

In the leakage detection device for the flue gas heat exchanger, the controller is connected with the DCS system and transmits the processed temperature signal to the DCS system.

The leakage detection device for the flue gas heat exchanger at least has the following advantages and beneficial effects: the smoke leakage detection rod is used, the multi-point temperature sensor is arranged in the smoke leakage detection rod for detection, the detection accuracy is high, and the leakage condition of the smoke heat exchanger can be effectively and quickly detected; meanwhile, a leakage signal of the heat exchanger is transmitted to the DCS system through a controller arranged outside the flue, so that the safe operation of the unit is ensured. The detection device has the advantages of low power consumption, good energy-saving effect, simple structure, stable and safe operation and wide application range, and is particularly suitable for the leakage detection of the high-temperature flue gas heat exchanger.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of a flue gas heat exchanger leak detection device of the present invention.

Fig. 2 is a schematic layout of the leakage detection device of the flue gas heat exchanger of the utility model.

In the figure: 1. the smoke leakage detection device comprises a smoke leakage detection rod, 2 parts of a controller, 3 parts of a smoke heat exchanger, 4 parts of a flue, 5 parts of a temperature sensor, 6 parts of a measurement lead and 7 parts of a DCS control system.

Detailed Description

To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the following detailed description will be made on the specific implementation, structure, steps, features and effects of the leakage detection device for a flue gas heat exchanger according to the present invention with reference to the accompanying drawings and preferred implementation examples.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of a leakage detection device for a flue gas heat exchanger according to the present invention, and fig. 2 is a schematic view of an arrangement of the leakage detection device for the flue gas heat exchanger according to the present invention.

The leakage detection device of the flue gas heat exchanger consists of a flue gas leakage detecting rod (1) and a controller (2). A plurality of flue gas leakage detecting rods (1) are arranged on the lee side of the flue gas heat exchanger (3), namely the tail flue (4), each flue gas leakage detecting rod (1) is connected with a controller (2) arranged outside the flue (4) through a measuring wire (6), and meanwhile, the controller (2) is connected to a DCS control system (7). In the working process, a probe of a temperature sensor (5) arranged on the smoke leakage probe rod (1) detects smoke coming from a smoke heat exchanger in real time, and sends smoke temperature signals of each measuring area to a controller (2) arranged outside a flue, and the controller (2) processes the signals and sends the signals to a DCS control system (7).

According to the utility model, the flue gas leakage detection rod (1) is close to the flue gas heat exchanger (3) for sampling, and the flue gas temperature of the leeward side of the flue gas heat exchanger (3), namely the tail flue (4), is detected, so that the leakage condition of the flue gas heat exchanger (3) can be rapidly and effectively detected, and the safe operation of the unit is ensured.

According to the utility model, a plurality of temperature sensors (5) are combined into a group through the smoke leakage detecting rod (1), and even a plurality of smoke leakage detecting rods (1) are arranged to form a matrix type multipoint sampling, so that the detection precision of the leakage condition of the smoke heat exchanger (3) is ensured.

The flue gas in the flue (4) has high temperature and strong corrosivity, so the flue gas leakage detecting rod (1) has wear resistance, high temperature resistance and corrosion resistance, and meanwhile, in order to be convenient to construct and maintain, a supporting beam and a protective sleeve are added, so that the working efficiency is ensured, the service life is prolonged, the maintenance cost is reduced, and the safe, economic and efficient operation of the whole flue gas heat exchanger leakage detecting device is ensured.

According to the utility model, the smoke leakage detection rod (1) is arranged in the flue (4), and the controller (2) is arranged outside the flue (4), for example, as shown in figure 1, one end of the smoke leakage detection rod (1) extends out of the flue (4) and is connected with the controller (2), so that the operation and maintenance of the device are convenient, and the maintenance is convenient.

The utility model is characterized in that a controller (2) is arranged on the smoke leakage detecting rod (1) arranged in the smoke channel (4) and connected with the smoke leakage detecting rod. The controller (2) of the utility model adopts a high-stability oscillating circuit, rectifies and amplifies the detected temperature signal through the oscillating circuit, and then carries out A/D conversion to obtain a digital signal, thereby realizing continuous on-line monitoring. Meanwhile, the controller (2) of the utility model can also be connected with a DCS control system (7) and transmits the processed leakage signal to the DCS control system (7).

Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.

Claims

1. A leakage detection device for a flue gas heat exchanger is characterized by comprising a plurality of flue gas leakage detecting rods and a controller; the flue on the leeward side of the flue gas heat exchanger is internally provided with a plurality of flue gas leakage detecting rods, and each flue gas leakage detecting rod is internally provided with a plurality of temperature sensor probes; the controller is arranged outside the flue, is connected with the temperature sensor and processes the detected temperature signal.

2. The flue gas heat exchanger leak detection device of claim 1, wherein the temperature sensor is a thermal resistor or thermocouple sensor.

3. The leak detector of claim 1, wherein one end of the flue gas leakage probe extends out of the flue to connect to the controller.

4. The leak detector of claim 1, wherein each temperature sensor of the flue gas leakage probe disposed in the flue is connected to the controller.

5. The leakage detection device of the flue gas heat exchanger as claimed in claim 1, wherein the plurality of flue gas leakage detecting rods and the plurality of temperature sensors are arranged inside the flue gas leakage detecting rods, a measuring matrix is formed in the flue gas flue, and the flue gas temperature of each area is accurately detected.

6. The flue gas heat exchanger leakage detection device of claim 1, wherein the controller is connected to a DCS system to transmit the processed temperature signal to the DCS system.