Activated carbon / coke regeneration cooling system

Abstract

The utility model provides an activated carbon / coke regeneration cooling system, which is characterized in that a heat recovery device is arranged to recycle heat generated by cooling of a regeneration cooling section, so that a cooling medium of the regeneration cooling section can be recycled, and meanwhile, a broken pipe detection control system is arranged on a circulating pipeline between the regeneration cooling section and the heat recovery device; whether the heat exchange tube is damaged or broken or not can be diagnosed in time, and the safety of the regeneration reaction process is guaranteed. Comprising a cooling medium circulation system used for introducing a cooling medium to cool activated carbon / coke after heating regeneration; the heat recovery device is communicated with the cooling medium circulation system through a pipeline and is used for recycling heat generated by cooling; and the broken pipe detection control system is connected to a pipeline between the cooling medium circulating system and the heat recovery device and is used for monitoring the running state of the cooling medium circulating system so as to judge whether the cooling medium circulating system has a broken pipe phenomenon or not.

Description

Technical Field

[0001] The utility model belongs to the field of air pollution control, relates to the technical field of safe operation of regeneration reaction, and specifically relates to an activated carbon / coke regeneration cooling system. Background Technique

[0002] The dry desulfurization and denitrification technology of activated carbon / coke has been widely used in the comprehensive treatment of industrial flue gas pollutants. After the activated carbon / coke catalyst absorbs pollutants, it needs to enter the regeneration reactor for regeneration. At present, the vast majority of regeneration methods adopt the thermal regeneration method, which needs to be heated to about 400 °C in the heating section of the regeneration reactor for heating regeneration, and then cooled in the cooling section of the regeneration reactor. The cooled activated carbon / coke returns to the purification system for recycling.

[0003] At present, for the cooling method after regeneration, most of the cooling media directly discharge after cooling and heat exchange in the cooling section of the regeneration reactor. And in actual production, due to the risk of breakage or damage of the heat exchange tubes in the cooling heat exchanger in the cooling section of the regeneration reactor, and due to the limitation of the number of temperature measurement points in the cooling section, it cannot be detected in time, which will cause the activated carbon / coke to leak into the air side of the cooling section, or the air to enter the activated carbon / coke side of the cooling section of the regeneration reactor, resulting in overheating of the reaction between the activated carbon / coke and oxygen in the air, and even combustion. If not discovered in time, it may lead to the damage of the entire regeneration reactor and even serious safety accidents. Content of the Utility Model

[0004] The utility model provides an activated carbon / coke regeneration cooling system, which sets a heat recovery device to recover and utilize the heat generated by cooling in the regeneration cooling section, enables the cooling medium in the regeneration cooling section to be recycled, and at the same time sets a broken pipe detection and control system on the circulation pipeline between the regeneration cooling section and the heat recovery device, which can timely diagnose whether there is damage or breakage of the heat exchange tubes and ensure the safety of the regeneration reaction process.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An activated carbon / coke regeneration cooling system, comprising:

[0007] A cooling medium circulation system for introducing a cooling medium to cool the activated carbon / coke after heating regeneration;

[0008] A heat recovery device communicated with the cooling medium circulation system through a pipeline for recovering and utilizing the heat generated by cooling;

[0009] A broken pipe detection and control system connected to the pipeline between the cooling medium circulation system and the heat recovery device for monitoring the operation state of the cooling medium circulation system to judge whether there is a broken pipe phenomenon in the cooling medium circulation system.

[0010] Further, the cooling medium circulation system includes a regeneration reactor, a cooling circulation fan, and a cooling medium makeup valve; the cooling medium makeup valve is connected to the cooling circulation fan through a medium makeup pipeline, the cooling circulation fan is connected to the cooling section of the regeneration reactor through a pipeline, and the cooling section of the regeneration reactor is connected to the heat recovery device through a pipeline.

[0011] Further, the heat recovery device is also connected to the medium makeup pipeline through a pipeline for introducing the cooled cooling medium in the heat recovery device into the medium makeup pipeline after heat exchange.

[0012] Further, the heat recovery device is a shell-and-tube heat exchanger or a waste heat boiler.

[0013] Further, the broken pipe detection and control system includes a controller, a concentration measuring device, and a pressure measuring device; the concentration measuring device and the pressure measuring device are both installed on the connecting pipeline between the cooling section of the regeneration reactor and the heat recovery device, and both are electrically connected to the controller; the controller is also electrically connected to the cooling medium makeup valve.

[0014] Further, the concentration measuring device is an oxygen concentration detector or a CO concentration detector.

[0015] The beneficial effects of the present utility model include:

[0016] By setting up a heat recovery device, the heat generated during the cooling process of the regeneration cooling section can be recovered and utilized, enabling the cooling medium to be recycled, reducing the consumption and emission of the cooling medium, improving the energy utilization efficiency, reducing energy waste, and lowering costs. Timely diagnosis of the damage or breakage of the heat exchange pipes in the regeneration cooling section is the key to ensuring the normal operation and safe operation of the regeneration reactor. The present system sets up a broken pipe detection and control system on the circulation pipeline between the regeneration cooling section and the heat recovery device, which can monitor the operating state of the cooling medium circulation system in real time, timely detect and diagnose whether there is damage or breakage of the heat exchange pipes, and thus effectively prevent the leakage of activated carbon / coke into the air side of the cooling section or the entry of air into the activated carbon / coke side, thereby avoiding the occurrence of safety accidents such as overheating and combustion, and ensuring the safety and stability of the regeneration reaction process. This system has a simple structure, convenient operation, and low maintenance cost, and has high market promotion value and application prospects. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present utility model.

[0018] In the figure: 10 - regeneration reactor, 101 - heating section, 102 - cooling section, 201 - cooling circulation fan, 202 - heat recovery device, 203 - cooling medium makeup valve, 204 - concentration measuring device, 205 - pressure measuring device, 30 - controller. Detailed implementation mode

[0019] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0020] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] The present utility model provides an activated carbon / coke regeneration cooling system with a broken pipe diagnosis function, which mainly includes: a cooling medium circulation system, a heat recovery device 202, and a broken pipe detection control system.

[0022] The cooling medium circulation system includes a regeneration reactor 10, a cooling circulation fan 201, and a cooling medium replenishment valve 203; the cooling medium replenishment valve 203 is connected to the cooling circulation fan 201 through a medium replenishment pipeline, the cooling circulation fan 201 is connected to the shell side of the cooling section 102 of the regeneration reactor 10 through a pipeline, and the cooling section 102 of the regeneration reactor 10 is connected to the heat recovery device 202 through a pipeline.

[0023] The heat recovery device 202 is used to recover and utilize the heat of regeneration cooling, and can be selected as a shell-and-tube heat exchanger or a waste heat boiler, which can recover hot water or low-pressure steam, or serve as a heat exchange source for other heat consumption points. Among them, the shell-and-tube heat exchanger is preferred, and water cooling is adopted to recover hot water.

[0024] The broken pipe detection control system includes a controller 30, a concentration measurement device 204, and a pressure measurement device 205; both the concentration measurement device 204 and the pressure measurement device 205 are installed on the connecting pipeline between the cooling section 102 of the regeneration reactor 10 and the heat recovery device 202, and both are electrically connected to the controller 30; the controller 30 is also electrically connected to the cooling medium replenishment valve 203. Among them, the concentration measurement device 204 is an oxygen concentration detector or a CO concentration detector, and the CO concentration detector is preferred. The pressure measurement device 205 can be selected from conventional pressure detectors on the market. The controller 30 is controlled by a PLC or extended through the control system of the desulfurization and denitrification device. Its main function is to monitor the operating status of the equipment in the system, and perform logical calculations and judgments through pressure and concentration data, so as to diagnose whether there is a broken pipe phenomenon in the cooling system, and give timely reminders and warnings to the operator through alarms, interlocks, etc., to ensure the safety of the regeneration reactor.

[0025] The above-mentioned cooling medium is: air, nitrogen or other inert gases. Air is preferred.

[0026] Example 1

[0027] The regenerative cooling system uses air as the cooling medium. The cooled air is controlled by the cooling medium supply valve 203 to enter. After passing through the cooling circulation fan 201, it enters the shell side of the cooling section 102 of the regeneration reactor 10 and exchanges heat with the regenerated activated carbon. The heated air after heat exchange enters the heat recovery device 202 for heat recovery. The heat recovery device is a shell-and-tube heat exchanger. The hot air flows through the tube side and the cold water flows through the shell side. The hot water at 80°C obtained by heat exchange is recycled.

[0028] The pressure measuring device 205 and the cooling medium supply valve 203 form a pressure control loop. The controller 30 controls the pressure at the measuring point to be 0.5 Kpa lower than the pressure inside the regeneration reactor 10. When the pressure is too low, the cooling medium supply valve 203 is opened to supplement air.

[0029] Since the air pressure in the cooling system is lower than the pressure inside the regeneration reactor 10, when a heat exchange tube in the cooling section breaks or is damaged, the air inside the regeneration reactor will enter the air side of the cooling section, resulting in an increase in the air side pressure. At the same time, it will also cause a decrease in the oxygen concentration on the air side. When the high-temperature activated carbon leaking into the air side encounters the hot air, it will be partially oxidized to produce CO, resulting in an increase in the CO concentration in the cooling air. By detecting the pressure and oxygen concentration or CO concentration, it can be diagnosed that the heat exchange tube has an abnormality. At this time, the controller gives an alarm reminder and interlocks to stop the regeneration circulation system if necessary. In this example, the method of detecting the CO concentration is adopted, and the alarm value is set to 100 mg / m 3 .

[0030] Example 2

[0031] The regenerative cooling system uses nitrogen as the cooling medium. The cooled nitrogen is controlled by the cooling medium supply valve 203 to enter. After passing through the cooling circulation fan 201, it enters the shell side of the cooling section 102 of the regeneration reactor 10 and exchanges heat with the regenerated activated carbon. The heated nitrogen after heat exchange enters the heat recovery device 202 for heat recovery. The heat recovery device is a waste heat boiler, and steam at 0.3 MPa is recovered.

[0032] The pressure measuring device 205 and the cooling medium supply valve 203 form a pressure control loop. The controller 30 controls the pressure at the measuring point to be 0.5 Kpa higher than the pressure inside the regeneration reactor. When the pressure is lower than the control value, the cooling medium supply valve 203 is opened to supplement nitrogen, and it is required that the pressure of the supplemented nitrogen is greater than 10 KPaG.

[0033] Since the nitrogen pressure in the cooling system is higher than the pressure in the regeneration reactor, when a heat exchange tube breaks or is damaged in the cooling section, the nitrogen on the nitrogen side of the cooling section will enter the regeneration reactor, causing the pressure measured by the pressure measuring device 205 to drop. As a result, the nitrogen supply valve on the cooling system side needs to continuously supply nitrogen. It is set that when the nitrogen supply valve continuously supplies nitrogen for more than 10 minutes, or the number of times of supplying nitrogen within 10 minutes exceeds 2 times, the controller determines that there is a broken heat exchange tube situation, and the controller gives an alarm prompt. In this embodiment, the concentration measuring device 204 uses oxygen concentration detection to monitor the oxygen concentration in the nitrogen used for circulating cooling, prevent the oxygen concentration in the nitrogen from exceeding the standard, and the control value is 2% (V / V).

[0034] Through the activated carbon / coke regeneration cooling system with a broken tube diagnosis function of the present utility model, the heat obtained by cooling is recovered and reused, saving energy and reducing energy waste; through pressure detection, concentration detection and the controller, the operation of the cooling system is monitored in real time, the abnormal situation of the cooling medium is detected in time, and whether there is a broken tube situation is diagnosed by the controller, and actions such as alarm and interlock are taken according to the results to prompt the operator to deal with it in time, greatly improving the safety.

[0035] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An activated carbon / coke regeneration cooling system, characterized in that: include: The cooling medium circulation system is used to introduce cooling medium to cool the activated carbon / coke after heating and regeneration; A heat recovery device (202) is connected to the cooling medium circulation system through a pipeline and is used to recover and utilize heat generated by cooling; A pipe break detection control system is connected to the pipeline between the cooling medium circulation system and the heat recovery device (202) and is used to monitor the operating state of the cooling medium circulation system to determine whether there is a pipe break in the cooling medium circulation system.

2. An activated carbon / coke regeneration cooling system according to claim 1, characterized in that: The cooling medium circulation system comprises a regeneration reactor (10), a cooling circulation fan (201) and a cooling medium replenishing valve (203); the cooling medium replenishing valve (203) is connected to the cooling circulation fan (201) via a medium replenishing pipeline, the cooling circulation fan (201) is connected to the cooling section (102) of the regeneration reactor (10) via a pipeline, and the cooling section (102) of the regeneration reactor (10) is connected to the heat recovery device (202) via a pipeline.

3. An activated carbon / coke regeneration cooling system according to claim 2, characterized in that: The heat recovery device (202) is also connected to the medium replenishment pipeline through a pipeline, so as to pass the cooling medium after heat exchange in the heat recovery device (202) into the medium replenishment pipeline.

4. An activated carbon / coke regeneration cooling system according to any one of claims 1 to 3, characterized in that: The heat recovery device (202) is a shell-and-tube heat exchanger or a waste heat boiler.

5. An activated carbon / coke regeneration cooling system according to claim 2 or 3, characterized in that: The pipe break detection control system comprises a controller (30), a concentration measuring device (204) and a pressure measuring device (205); the concentration measuring device (204) and the pressure measuring device (205) are both installed on the connecting pipeline between the cooling section (102) of the regeneration reactor (10) and the heat recovery device (202), and both are electrically connected to the controller (30); the controller (30) is also electrically connected to the cooling medium replenishing valve (203).

6. An activated carbon / coke regeneration cooling system according to claim 5, characterized in that: The concentration measuring device (204) is an oxygen concentration detector or a CO concentration detector.

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