CN116147368A - A monitoring method, system and device for a waste heat recovery system - Google Patents

Abstract

The invention discloses a monitoring method, system and device of a waste heat recovery system, comprising: reading the surface temperature T of a heat exchange tube in a riser heat exchanger; judging whether the surface temperature T of the heat exchange tube satisfies T1‑A≤T ≤T1; if the surface temperature T of the heat exchange tube satisfies T1‑A≤T≤T1, then output a prompt indicating that the circulating water volume of the riser heat exchanger is too large, and reduce the opening of the water inlet valve of the riser heat exchanger. The technical solution of the present invention can monitor the operating state of the riser heat exchanger in real time, and adjust the operating condition of the riser heat exchanger in real time according to the operating state of the riser heat exchanger. The solution provided by the present invention solves the problem of the prior art The problem that it is impossible to monitor and adjust the operating conditions of the riser heat exchanger, while ensuring the heat recovery efficiency, it also reduces or prevents the generation of graphite on the inner wall of the riser heat exchanger, reducing the equipment maintenance cost of the coking plant , Improve the economic benefits of the coking plant.

Description

A monitoring method, system and device for a waste heat recovery system

technical field

The invention relates to the technical field of coking, in particular to a monitoring method, system and device of a waste heat recovery system.

Background technique

In the current coking field, coking coal is usually heated to about 1000°C under the condition of being isolated from the air, and coke is made through pyrolysis, carbonization, coking and other transformations. In order to recover a large amount of unused sensible heat in the coke oven, through the waste heat recovery system, the waste heat in the raw coal gas is recovered for the coking plant's own use.

During the turnover cycle of the coke oven coking chamber, the temperature of the raw gas changes drastically, resulting in a poor working environment for the waste heat recovery system, which in turn makes the waste heat recovery system prone to failure. In the related art, there is no corresponding technical means to effectively monitor the state of the waste heat recovery system.

Contents of the invention

The embodiment of the present application provides a monitoring method, system and device for a waste heat recovery system, which solves the technical problem that the working condition of the waste heat recovery system cannot be monitored in real time in the prior art, and realizes real-time monitoring of the waste heat recovery system, and according to the waste heat The operating conditions of the recovery system, and the technical effect of adjusting the operating state of the waste heat recovery system.

In the first aspect, the present application provides a monitoring method for a waste heat recovery system, the method comprising:

Read the surface temperature T of the heat exchange tube in the riser heat exchanger;

Determine whether the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1;

If the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1, then output a warning that the circulating water volume of the heat exchanger in the riser is too large, and reduce the opening of the water inlet valve of the heat exchanger in the riser, where A is The water leakage alarm coefficient of the coke oven where the riser heat exchanger is located, T1 is the corresponding saturation temperature of the steam drum in the riser heat exchanger at the corresponding operating pressure.

Further, the method also includes:

Determine whether the surface temperature T of the heat exchange tube satisfies T>T1+B;

If the surface temperature T of the heat exchange tube satisfies T>T1+B, then output a reminder that the circulating water volume of the heat exchanger in the riser is too small, and increase the opening of the water inlet valve of the heat exchanger in the riser, where B is the flow rate of the heat exchanger in the riser. The overheating warning coefficient of the coke oven where the heater is located.

Further, the overheat warning coefficient B of the riser heat exchanger is positively correlated with the height of the coke oven coking chamber where the riser heat exchanger is located.

Further, the method also includes:

Determine whether the surface temperature T of the heat exchange tube satisfies T<T1-A;

If the surface temperature T of the heat exchange tube satisfies T<T1-A, then output a reminder of water leakage or pipe burst in the heat exchange tube in the riser heat exchanger, and send out an audible and visual alarm signal.

Further, the water leakage alarm coefficient A of the riser heat exchanger is positively correlated with the height of the coke oven coking chamber where the riser heat exchanger is located.

Further, the method also includes:

Determine whether the surface temperature T of the heat exchange tube satisfies T1<T≤T1+B;

If the surface temperature T of the heat exchange tube satisfies T1<T≤T1+B, then output a reminder that the riser heat exchanger is running normally.

Further, the saturation temperature T1 of the steam drum in the riser heat exchanger is positively correlated with the operating pressure of the steam drum in the riser heat exchanger.

In the second aspect, the present application provides a monitoring system for a waste heat recovery system, the system includes:

A temperature measuring device for measuring the surface temperature T of the heat exchange tube in the riser heat exchanger;

The controller is connected with the temperature measuring device, and is used to execute the method provided by the first aspect.

In a third aspect, the present application provides a monitoring device for a waste heat recovery system, which includes:

The reading module is used to read the surface temperature T of the heat exchange tube in the riser heat exchanger;

A judging module, used to judge whether the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1;

The output module is used to output a reminder that the circulating water volume of the riser heat exchanger is too large when the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1, and to reduce the opening of the water inlet valve of the riser heat exchanger , where A is the water leakage alarm coefficient of the riser heat exchanger at the coke oven riser, and T1 is the saturation temperature corresponding to the steam drum in the riser heat exchanger at the coke oven riser at the corresponding operating pressure.

In a fourth aspect, the present application provides a controller, including one or more processors and one or more memories, at least one program code is stored in one or more memories, at least one program code is executed by one processor or multiple loaded and executed to implement the operations performed by a method as provided in the first aspect.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

In the embodiment of the present application, the surface temperature T of the heat exchange tube in the riser heat exchanger is read by the monitoring system, and the temperature range of the surface temperature T is determined, and the waste heat recovery system is adjusted according to the range of the surface temperature T to improve For the working condition of the riser heat exchanger, for example, the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1, a prompt indicating that the circulating water volume of the riser heat exchanger is too large is output, and the inlet flow rate of the riser heat exchanger is reduced. Water valve opening. The method provided by this embodiment solves the problem that the operating conditions of the riser heat exchanger cannot be monitored and adjusted in the prior art. While ensuring the heat recovery efficiency, it also reduces or prevents the graphite on the inner wall of the riser heat exchanger. The amount of production reduces the equipment maintenance cost of the coking plant and improves the economic benefits of the coking plant.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural diagram of a monitoring system of a waste heat recovery system provided by the present application, specifically an enlarged schematic diagram of the area marked by a circle in Fig. 2;

Fig. 2 is a schematic diagram of the positional relationship between the monitoring system provided in Fig. 1 and the riser heat exchanger;

FIG. 3 is a schematic flowchart of a monitoring method for a waste heat recovery system provided by the present application;

Fig. 4 is a schematic flow chart of an example of a monitoring method for a waste heat recovery system provided by the present application;

Fig. 5 is a schematic diagram of the temperature change of the raw gas at the inlet of the riser at each stage of the coke oven turnover cycle in the traditional technology;

Fig. 6 is a schematic diagram of the temperature change at the 21# riser heat exchanger in the example;

Fig. 7 is the schematic diagram of the temperature change at the 140# riser heat exchanger place in the example;

Fig. 8 is a schematic structural diagram of a monitoring device of a waste heat recovery system provided by the present application.

Reference signs:

1-Rising tube heat exchanger, 2-Thermocouple installation base, 3-Heat insulation protective cover, 4-Heat exchange tube, 5-Thermocouple, 6-Analog-to-digital conversion module, 7-Rising tube.

Detailed ways

The embodiment of the present application solves the problem in the prior art that the operating state of the riser heat exchanger 1 cannot be monitored by providing a monitoring method for the waste heat recovery system.

The technical solution of the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

A monitoring method for a waste heat recovery system, the method comprising: reading the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1; judging whether the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1; if If the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, then output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too large, and reduce the opening of the water inlet valve of the riser heat exchanger 1, wherein, A is the water leakage alarm coefficient of the coke oven where the riser heat exchanger 1 is located, and T1 is the corresponding saturation temperature of the steam drum in the riser heat exchanger 1 at the corresponding operating pressure.

In the embodiment of the present application, the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1 is read by the monitoring system, and the temperature range of the surface temperature T is determined, and the waste heat recovery system is adjusted according to the range of the surface temperature T , to improve the working condition of the riser heat exchanger 1, for example, if the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, then output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too large, and turn down the riser The water inlet valve opening of heat exchanger 1. The method provided by this embodiment solves the problem that the operating condition of the riser heat exchanger 1 cannot be monitored and adjusted in the prior art. While ensuring the heat recovery efficiency, it also reduces or prevents the graphite from forming in the riser heat exchanger 1. The amount of generation on the inner wall reduces the equipment maintenance cost of the coking plant and improves the economic benefits of the coking plant.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

First of all, the term "and/or" that appears in this article is just an association relationship that describes associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: there is A alone, and A exists at the same time and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

This application provides a monitoring system for waste heat recovery system as shown in Figure 1, the system includes:

A temperature measuring device for measuring the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1;

The controller is connected with the temperature measuring device and can implement a method for monitoring the waste heat recovery system, which will be described later and will not be described here.

During the coking process, the coking coal is loaded into the coking chamber of the coke oven, and the air is isolated from the carbonization chamber to generate a large amount of raw coal gas. After the raw gas leaves the carbonization chamber, it passes through the rising pipe, the tee, and the bridge pipe to the gas collecting pipe, and then is transported to the gas purification process. Among them, the temperature of the raw coal gas when it leaves the carbonization chamber is 650°C-950°C, while the temperature of the high-temperature raw coal gas is sprayed with circulating ammonia water at the bridge pipe to cool down to about 80°C-85°C, and the temperature of the raw coal gas is reduced from 650°C-950°C to 80 ℃ ~ 85 ℃, resulting in a lot of sensible heat wasted.

In order to reduce the waste rate of sensible heat, waste heat is recovered by replacing the riser with the riser heat exchanger 1 . The form of combination of riser pipe 7 and heat exchanger can be arbitrary. For example, heat exchanger can be arranged on the surface of riser pipe 7 in a winding manner to increase the area in contact with riser pipe 7, thereby increasing the heat exchange area and improving heat transfer efficiency. efficiency. Referring to Fig. 2, it is a schematic diagram of the positional relationship between the monitoring system and the riser heat exchanger 1 provided in this embodiment, specifically, the heat exchanger is wound on the surface of the riser 7 to cover the heat exchanger on the riser 7 Surface purpose, and then realize waste heat recovery.

As shown in FIG. 1 , the riser heat exchanger 1 is composed of a riser 7 and a heat exchanger, and the heat exchanger includes a heat exchange tube 4 . On the middle casing of the riser heat exchanger 1, a thermocouple mounting base 2 is set, and the measurement end of the thermocouple 5 reaches the heat exchange tube 4 of the riser heat exchanger 1 through the heat insulation protective cover 3, and the real-time measurement is performed here. The surface temperature T of the heat pipe 4, the measured temperature signal is converted into a digital signal by the analog-to-digital conversion module 6 and transmitted to the control system.

The heat exchange medium in the heat exchange tube 4 can be water or heat transfer oil. Using water as the heat exchange medium in the heat exchange tube 4 can make the heat exchange tube 4 leak without causing environmental pollution; In terms of the heat exchange medium in the heat transfer oil, the heat transfer oil has better thermal stability, less coking, and a longer service life, but when the heat exchange tube 4 leaks, it is easy to cause a fire accident and pollute the environment. The specific heat exchange medium can be selected according to the actual situation, and this embodiment only uses water as an example for subsequent description.

The temperature measuring device can be arranged at any position on the surface of the riser heat exchanger 1 , for example, it can be arranged at the upper part, the middle part or the lower part of the riser heat exchanger 1 . Wherein, the riser heat exchanger 1 is at the top or upper part of the coke oven carbonization chamber, and the height of the coke oven carbonization chamber is higher. If the temperature measuring device is arranged on the upper part of the riser heat exchanger 1, the temperature measuring device During maintenance, additional lifting equipment is required to assist the maintenance personnel to rise to the position where the temperature measuring device is located, which is not conducive to equipment inspection and maintenance. If the temperature measuring device is installed at the lower part of the riser heat exchanger 1, since the bottom of the riser is close to the raw gas inlet, the temperature is high, and the environment for the maintenance personnel is relatively harsh; in addition, the temperature measuring device is in a high temperature environment for a long time, which may shorten The service life of the temperature measuring device; and, when the heat exchange tube 4 in the riser heat exchanger 1 leaks, because the temperature at the bottom of the riser 7 is high, the temperature change is not obvious when it leaks, and this embodiment is mainly The state monitoring of the riser heat exchanger 1 is carried out depending on the variation range of the temperature measured by the temperature measuring device. If the temperature change is not obvious, it is not conducive to the state monitoring of the riser heat exchanger 1 .

Preferably, the temperature measuring device can be arranged in the middle of the riser heat exchanger 1 (i.e. the middle of the riser 7, see Figure 2 for details). The temperature measuring device can be overhauled with high tools, and the temperature in the middle of the riser pipe 7 is relatively moderate. If there is a water leak in the riser pipe heat exchanger 1, the leaked water can evaporate quickly and take away a large amount of heat, resulting in a large temperature change. Large, through temperature monitoring, the abnormal state of the riser heat exchanger 1 can be detected faster, the reaction time for maintenance is shortened, and the negative impact of water leakage on the furnace wall of the carbonization chamber is reduced to a certain extent.

The temperature measuring device can be any device capable of measuring the surface temperature of the heat exchange tube 4 in the riser heat exchanger 1, such as a high temperature resistant thermometer, an infrared thermometer, a thermocouple, etc., which can be selected according to the actual situation.

In this embodiment, the thermocouple 5 is used to measure the surface temperature T of the heat exchange tube 4 . Thermocouple temperature measurement has high accuracy, is not affected by ambient temperature, has a wide temperature measurement range, and uses thermocouple temperature measurement with fast dynamic response speed, which can be used to measure temperature in real time. The temperature signal generated by thermocouple measurement can be transmitted remotely, which is more convenient for centralized detection and automatic control.

After the temperature measuring device measures the surface temperature T of the heat exchange tube 4, it sends the surface temperature T to the controller, or the controller reads the surface temperature T from the temperature measuring device, and then monitors the waste heat recovery system according to the surface temperature T and its changes. state. Wherein, the surface temperature T collected by the temperature measuring device is an analog signal. After the controller reads the surface temperature T from the temperature measuring device, the analog-to-digital conversion module 6 provided inside the controller performs signal conversion, and the surface temperature of the analog signal T is converted into the surface temperature T of the digital signal, and then the status of the waste heat recovery system is monitored according to the surface temperature T of the digital signal and its change.

Usually, a coke oven will be equipped with multiple riser heat exchangers 1, and each riser heat exchanger 1 needs to perform state detection according to its temperature change. In actual operation, each riser heat exchanger can be The corresponding heat exchange tube 4 or temperature measuring device in 1 is numbered, and the temperature signal detected by the temperature measuring device carries the number of the corresponding temperature measuring device, so that the controller can judge which riser heat exchanger the received temperature signal belongs to 1 temperature signal. That is to say, when the controller receives the surface temperature, it also needs to identify its corresponding temperature measuring device number.

The controller of the waste heat recovery system executes the monitoring method of the waste heat recovery system as shown in FIG. 3 for each received surface temperature T, and the method includes (step S11-step S15):

Step S11, reading the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1;

Step S12, judging whether the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1; if the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, output the circulating water volume of the riser heat exchanger 1 If it is too large, reduce the opening of the water inlet valve of the riser heat exchanger 1, where A is the water leakage alarm coefficient of the coke oven where the riser heat exchanger 1 is located, and T1 is the steam in the riser heat exchanger 1. When the package is at the corresponding operating pressure, the corresponding saturation temperature.

Step S13, judging whether the surface temperature T of the heat exchange tube 4 satisfies T>T1+B; if the surface temperature T of the heat exchange tube 4 satisfies T>T1+B, output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too small , and increase the opening of the water inlet valve of the riser heat exchanger 1, where B is the overheat alarm coefficient of the coke oven where the riser heat exchanger 1 is located.

Step S14, judging whether the surface temperature T of the heat exchange tube 4 satisfies T<T1-A; if the surface temperature T of the heat exchange tube 4 satisfies T<T1-A, then output the water leakage of the heat exchange tube 4 of the riser heat exchanger 1 or Prompt of pipe burst, and send out sound and light alarm signal.

Step S15, judging whether the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B; if the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B, then the output riser heat exchanger 1 operates normally tips.

Regarding step S11, the surface temperature T can be detected by a detection device in the system, such as a thermocouple or other equipment, which will not be described in detail here. For the measurement method, please refer to the above description of the waste heat recovery system. The reading frequency of the surface temperature T can be set according to the actual situation. For example, for the temperature measuring device of each riser heat exchanger 1, the temperature can be read every 1s or every 10s. Set according to the service life of the temperature measuring device or riser heat exchanger 1. When the temperature measuring device or riser heat exchanger 1 is a new device, the probability of problems with the new device is small, so it can be read every 5s or longer Take the temperature once; and when the temperature measuring device or the riser heat exchanger 1 is a device with a long service life, the probability of a problem with a device with a long service life is greater than that of a new device, so it can be 1s Or take a temperature reading in less time.

The steps S12-S15 may be executed simultaneously, or may be executed in a preset order, and the preset order may be set according to the actual situation, which is not limited here.

According to the temperature range of the surface temperature T (temperature range includes T1-A≤T≤T1, T>T1+B, T<T1-A and T1<T≤T1+B), the following processing methods are available:

Range 1【T1-A≤T≤T1】

Range 1 specifically corresponds to step S12. After the monitoring system reads the surface temperature T of the heat exchange tube 4, the monitoring system executes the judgment logic of whether the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1.

Wherein, T1 is the saturation temperature corresponding to the steam drum in the riser heat exchanger 1 at the corresponding operating pressure. The higher the operating pressure of the steam drum, the higher the corresponding saturation temperature. Specifically, the value of T1 can be determined by checking the enthalpy temperature table, as shown in Table 1, which is the relationship between the operating pressure and saturation temperature of a certain type of steam drum.

Table 1

Drum operating pressure (MPa) 0.4 0.6 1.0 1.6 2.0 2.5 T1 143 159 180 201 212 224

A is the water leakage alarm coefficient of the coke oven where the riser heat exchanger 1 is located. The coefficient A is related to the height of the coke oven carbonization chamber. The higher the height of the coke oven carbonization chamber, the greater the coefficient A. As shown in Table 2, it is the relationship between the height of the coke oven carbonization chamber and the coefficient A.

Table 2

Coke oven carbonization chamber height (m) A B 4.3～6 30～40 20～30 6～7 35～45 25～35 7～8 40～60 30～100

If the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, it means that the water volume in the heat exchange tube 4 is too large, a lot of water vapor is generated, and too much heat is taken away, resulting in a low temperature of the riser tube 7 and burning. Some high-boiling tar fractions in the furnace riser 7 are easily condensed when the inner wall is cooled, and these condensates are subjected to radiation or convective heat transfer on the furnace top to undergo pyrolysis and thermal condensation to solidify into graphite. In order to improve this situation, the monitoring system recognizes the number of the temperature measuring device carried in the temperature signal at this time, and outputs a reminder that the circulating water volume of the riser heat exchanger 1 is too large for the riser heat exchanger 1 corresponding to the number, and turns down the riser. The opening of the water inlet valve of the heat exchanger 1 reduces the water flow in the riser heat exchange tube 4, reduces the heat taken away, increases the temperature of the riser 7, and reduces the formation of graphite. The formation of graphite on the inner wall of the riser tube 7 can be avoided.

Range 2【T＞T1+B】

Range 2 specifically corresponds to step S13. After the monitoring system reads the surface temperature T of the heat exchange tube 4, the monitoring system executes the judgment logic of whether the surface temperature T of the heat exchange tube 4 satisfies T>T1+B.

B is the overheat alarm coefficient of the coke oven where the riser heat exchanger 1 is located. The coefficient B is related to the height of the coke oven carbonization chamber. The higher the height of the coke oven carbonization chamber, the greater the coefficient B is, as shown in Table 2. The relationship between the height of coke oven carbonization chamber and B.

If the surface temperature T of the heat exchange tube 4 satisfies T>T1+B, it means that the amount of water in the heat exchange tube 4 is too small, the amount of steam generated is too small, and the heat taken away is small, resulting in the temperature in the coke oven riser 7 being too high , At this time, the heat transfer efficiency is too low, and a large amount of sensible heat will be wasted. In order to improve this situation, the monitoring system identifies the number of the temperature measuring device carried in the temperature signal, and outputs a reminder that the circulating water volume of the riser heat exchanger 1 is too small for the riser heat exchanger 1 corresponding to the number, and outputs a control signal to adjust Large opening of the water inlet valve of the riser heat exchanger 1 increases the water flow in the heat exchange tube 4 of the riser heat exchanger 1, takes away more heat in the riser 7, and improves the recovery rate of sensible heat.

Range 3 [T<T1-A]

Range 3 specifically corresponds to step S14. After the monitoring system reads the surface temperature T of the heat exchange tube 4, the monitoring system executes the judgment logic of whether the surface temperature T of the heat exchange tube 4 satisfies T<T1-A.

If the surface temperature T of the heat exchange tube 4 satisfies T<T1-A, it means that the riser heat exchanger 1 may have leaked or burst, and the leaked water will be evaporated quickly, taking away a large amount of heat. The surface temperature drops rapidly. In order to quickly remind relevant personnel and reduce the amount of water leaking into the coke oven, the monitoring system recognizes the number of the temperature measuring device carried in the temperature signal at this time, and outputs the heat exchange of the riser heat exchanger 1 for the riser heat exchanger 1 corresponding to the number Pipe 4 leaks or pipe burst prompts, and sends out sound and light alarm signals to remind relevant personnel to cut off water or do other processing as soon as possible.

Range 4 [T1<T≤T1+B]

Range 4 corresponds to step S15. After the monitoring system reads the surface temperature T of the heat exchange tube 4, the monitoring system executes the judgment logic of whether the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B.

If the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B, it means that the heat absorbed by the riser heat exchanger 1 is suitable at this time, and graphite will not be formed on the inner wall of the riser 7, and the recovery of sensible heat rate is also high, then the monitoring system recognizes the number of the temperature measuring device carried in the temperature signal, and can output a prompt for the normal operation of the riser heat exchanger 1 for the riser heat exchanger 1 corresponding to the number, reminding the relevant staff that the waste heat recovery system is running normal.

The monitoring method provided above is repeatedly executed during the operation of the riser 7 to achieve the purpose of continuously monitoring the waste heat recovery system installed in the coke oven.

To sum up, in this embodiment, the surface temperature T of the heat exchange tube 4 is detected by the temperature measuring device, and the actual operating state of the riser heat exchanger 1 is determined according to the surface temperature T. For example, when the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, it means that the circulating water volume of the riser heat exchanger 1 is too large, and it is necessary to reduce the opening of the water inlet valve of the riser heat exchanger 1; The surface temperature T of the heat exchange tube 4 satisfies T>T1+B, which means that the circulating water volume of the riser heat exchanger 1 is too small, and it is necessary to increase the opening of the water inlet valve of the riser heat exchanger 1; when the heat exchange tube 4 The surface temperature T satisfies T<T1-A, which means that the heat exchange tube 4 in the riser heat exchanger 1 may leak or burst, and the waste heat recovery system will send out an audible and visual alarm signal to remind relevant personnel to deal with it in time; when the heat exchange tube The surface temperature T of 4 satisfies T1<T≤T1+B, which means that the circulating water volume of the riser heat exchanger 1 is moderate and the operating condition of the riser heat exchanger 1 is normal. This embodiment can ensure the heat recovery rate of the waste heat recovery system, and at the same time reduce the amount of graphite formed on the inner wall of the riser 7, and even avoid the formation of graphite on the inner wall of the riser 7. In addition, it can also monitor in real time whether the riser heat exchanger 1 is in the Abnormal working conditions such as water leakage or pipe burst, to prevent damage to the wall of the coke oven carbonization chamber caused by long-term water leakage.

Now take a certain type of waste heat recovery system as an example to describe step S11-step S15.

Application example of producing 1.6MPa steam by utilization of raw gas waste heat in a 7.63m top-loading coke oven in a coking plant:

The 7.63-meter coke oven is a 2×70-hole top-loading coke oven with an annual output of 2.06 million tons of coke. 140 riser heat exchangers 1 with the monitoring method and device of this embodiment are used to recover waste gas waste heat and produce 1.5 MPa The steam is for the coking plant's own use. The monitoring system uses the method provided in this embodiment to realize the automatic identification and judgment of the operating status of each riser heat exchanger 1, and to carry out corresponding control measures according to its operating status. At the same time, it can detect rising Tube heat exchanger 1 leaks or bursts in abnormal working conditions to prevent long-term water leakage from causing damage to the coke oven carbonization chamber wall.

In this application example, query the above Table 1, when the operating pressure of the steam drum is 1.6MPa, the value of T1 is 201; query the above Table 2, when the height of the coke oven carbonization chamber is 7.63 meters, the value of the water leakage alarm coefficient A is 50. The value of overheat alarm coefficient B is 40.

See Figure 4 for the operation logic of the waste heat recovery system.

Step 1, read the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1 according to the preset frequency, and the surface temperature T is collected by a thermocouple;

Step 2, judge whether the surface temperature T of the heat exchange tube 4 satisfies 151≤T≤201; if the surface temperature T of the heat exchange tube 4 satisfies 151≤T≤201, output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too large , and reduce the opening of the water inlet valve of the riser heat exchanger 1.

Step 3, judge whether the surface temperature T of the heat exchange tube 4 satisfies T>241; if the surface temperature T of the heat exchange tube 4 satisfies T>241, output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too small, and increase the The opening degree of the water inlet valve of riser heat exchanger 1.

Step 4, determine whether the surface temperature T of the heat exchange tube 4 satisfies T<151; if the surface temperature T of the heat exchange tube 4 satisfies T<151, then output the prompt of water leakage or burst of the heat exchange tube 4 of the riser heat exchanger 1 , and send out an audible and visual alarm signal.

Step 5, judging whether the surface temperature T of the heat exchange tube 4 satisfies 201<T≤241; if the surface temperature T of the heat exchange tube 4 satisfies 201<T≤241, output a reminder that the riser heat exchanger 1 is operating normally.

The above steps 1-5 can be matched with the results in Table 3.

table 3

serial number Operating status detection logic Control Method 1 Operating normally 241≥T＞201 Maintain the current working conditions without adjustment 2 The amount of circulating water is too large 151≤T≤201 Decrease the opening of the water inlet valve 3 Circulating water volume is too small T>241 Increase the opening of the water inlet valve 4 leaking or bursting pipes T<151 Sound and light alarm and close the water inlet and outlet valves

After the project is commissioned and running normally, T1 generally changes between 203 and 231°C, the steam production rate of the system is 24.7t/h, the steam production rate per ton of coke is 105.1kg/t, and there is no obvious graphite on the inner wall of the riser heat exchanger 1 and black smoke phenomenon.

As shown in Figure 5, it is a schematic diagram of the temperature change of the raw gas at the inlet of the riser at each stage of the coke oven turnover cycle in the traditional technology (that is, the technology without the riser heat exchanger). During the turnover cycle of the coke oven coking chamber, the temperature of the raw gas during the coal charging and coke pushing stages changes drastically, resulting in a harsh working environment for the waste heat recovery system, which in turn makes the waste heat recovery system prone to failure.

As shown in Figure 6, it is the temperature change curve of the 21# riser heat exchanger in 140 riser heat exchangers 1. It can be seen that after the riser 7 in the coke oven is replaced with the riser heat exchanger 1, not only The recovered heat can also reduce the temperature fluctuation range or frequency, improve the harshness of the working environment of the riser 7, and prolong the service life of the riser heat exchanger and the monitoring system.

In order to simulate water leakage from heat exchange tube 4 in riser heat exchanger 1, 2 liters of water was injected into the upper steam release port of 140# riser heat exchanger at one time. The automatic sound and light alarm starts in 40 seconds. It can be seen that the monitoring method and monitoring system provided by this embodiment can effectively monitor the working state of the riser heat exchanger and reduce the damage to the coke oven caused by the water leakage of the riser heat exchanger.

In summary, the solution provided in this embodiment can ensure the heat recovery rate of the waste heat recovery system, and at the same time reduce the amount of graphite formed on the inner wall of the riser 7, and even avoid the formation of graphite on the inner wall of the riser 7, and can monitor the riser in real time Whether the heat exchanger 1 is in abnormal working conditions such as water leakage or pipe burst, to prevent long-term water leakage from causing damage to the coke oven carbonization chamber wall.

Based on the same inventive concept, this application provides a monitoring device for a waste heat recovery system as shown in Figure 8, the device includes:

The reading module 41 is used to read the surface temperature T of the heat exchange tube 4 in the riser heat exchanger 1;

A judging module 42, configured to judge whether the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1;

The output module 43 is used to output a prompt indicating that the circulating water volume of the riser heat exchanger 1 is too large when the surface temperature T of the heat exchange tube 4 satisfies T1-A≤T≤T1, and to reduce the flow rate of the riser heat exchanger 1. The opening of the water valve, where A is the water leakage alarm coefficient of the riser heat exchanger 1 at the riser of the coke oven, and T1 is the corresponding operating pressure of the steam drum in the riser heat exchanger 1 of the riser of the coke oven. corresponding saturation temperature.

Further, the judging module 42 is also used to judge whether the surface temperature T of the heat exchange tube 4 satisfies T>T1+B;

The output module 43 is also used to output a reminder that the circulating water volume of the riser heat exchanger 1 is too small when the surface temperature T of the heat exchange tube 4 satisfies T>T1+B, and increase the water intake of the riser heat exchanger 1 Valve opening, where B is the overheating alarm coefficient of the coke oven where the riser heat exchanger 1 is located.

Further, the overheating warning coefficient B of the riser heat exchanger 1 is positively correlated with the height of the coke oven carbonization chamber where the riser heat exchanger 1 is located.

Further, the judging module 42 is also used to judge whether the surface temperature T of the heat exchange tube 4 satisfies T<T1-A;

The output module 43 is also used to output a warning of water leakage or pipe burst of the heat exchange tube 4 in the riser heat exchanger 1 when the surface temperature T of the heat exchange tube 4 satisfies T<T1-A, and send out an audible and visual alarm signal.

Further, the water leakage alarm coefficient A of the riser heat exchanger 1 is positively correlated with the height of the coke oven coking chamber where the riser heat exchanger 1 is located.

Further, the judging module 42 is also used to judge whether the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B;

The output module 43 is also used to output a reminder that the riser heat exchanger 1 is running normally when the surface temperature T of the heat exchange tube 4 satisfies T1<T≤T1+B.

Based on the same inventive concept, the present application also provides a controller, including one or more processors and one or more memories, at least one program code is stored in one or more memories, and at least one program code is executed by a processor or multiple loads and execute to realize the operations performed by the aforementioned monitoring method of a waste heat recovery system.

Since the electronic device introduced in this embodiment is the electronic device used to implement the information processing method in the embodiment of this application, based on the information processing method introduced in the embodiment of this application, those skilled in the art can understand the The specific implementation manner of the electronic device of the example and its various variations, so how the electronic device implements the method in the embodiment of the present application will not be described in detail here. As long as a person skilled in the art implements the electronic device used by the information processing method in the embodiment of the present application, it all falls within the scope of protection intended by the present application.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A monitoring method for a waste heat recovery system, characterized in that the method comprises: Read the surface temperature T of the heat exchange tube in the riser heat exchanger; Judging whether the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1; If the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1, output a prompt indicating that the circulating water volume of the heat exchanger in the riser is too large, and turn down the opening of the water inlet valve of the heat exchanger in the riser. degree, where A is the water leakage alarm coefficient of the coke oven where the riser heat exchanger is located, and T1 is the saturation temperature corresponding to the steam drum in the riser heat exchanger at the corresponding operating pressure. 2. The method according to claim 1, characterized in that the method further comprises: Judging whether the surface temperature T of the heat exchange tube satisfies T>T1+B; If the surface temperature T of the heat exchange tube satisfies T>T1+B, output a prompt indicating that the circulating water volume of the heat exchanger in the riser is too small, and increase the opening of the water inlet valve of the heat exchanger in the riser, Wherein B is the overheating warning coefficient of the coke oven where the riser heat exchanger is located. 3. The method according to claim 2, characterized in that the overheat warning coefficient B of the riser heat exchanger is positively correlated with the height of the coke oven carbonization chamber where the riser heat exchanger is located. 4. The method according to claim 1, wherein the method further comprises: Judging whether the surface temperature T of the heat exchange tube satisfies T<T1-A; If the surface temperature T of the heat exchange tube satisfies T<T1-A, then output a prompt of water leakage or burst of the heat exchange tube in the riser heat exchanger, and send out an audible and visual alarm signal. 5. The method according to claim 1, characterized in that the water leakage alarm coefficient A of the riser heat exchanger is positively correlated with the height of the coke oven carbonization chamber where the riser heat exchanger is located. 6. The method according to claim 1, further comprising: Judging whether the surface temperature T of the heat exchange tube satisfies T1<T≤T1+B; If the surface temperature T of the heat exchange tube satisfies T1<T≤T1+B, then output a prompt that the riser heat exchanger operates normally. 7. The method according to any one of claims 1 to 6, characterized in that the saturation temperature T1 of the steam drum in the riser heat exchanger is positively correlated with the operating pressure of the steam drum in the riser heat exchanger. 8. A monitoring system for a waste heat recovery system, characterized in that the system includes: A temperature measuring device for measuring the surface temperature T of the heat exchange tube in the riser heat exchanger; A controller, connected to the temperature measuring device, for executing the method according to any one of claims 1-7. 9. A monitoring device for a waste heat recovery system, characterized in that the device comprises: The reading module is used to read the surface temperature T of the heat exchange tube in the riser heat exchanger; A judging module, configured to judge whether the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1; An output module, configured to output a prompt indicating that the circulating water volume of the riser heat exchanger is too large when the surface temperature T of the heat exchange tube satisfies T1-A≤T≤T1, and turn down the riser heat exchanger The opening of the water inlet valve, wherein, A is the water leakage alarm coefficient of the riser heat exchanger at the coke oven riser, and T1 is the corresponding saturation of the steam drum in the riser heat exchanger at the corresponding operating pressure temperature. 10. A controller, characterized in that it includes one or more processors and one or more memories, at least one program code is stored in the one or more memories, and the at least one program code is controlled by a processor or more are loaded and executed to realize the operations performed by the method according to any one of claims 1 to 7.

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