Activated carbon regeneration heating system

Abstract

The utility model provides an activated carbon regeneration heating system, which can recycle an activated carbon regeneration heating medium, can monitor the operation safety of the regeneration heating system in real time, and can timely diagnose and warn when a regeneration heating pipe is damaged. An air outlet of the hot-blast stove is connected with a heating section air inlet of the regeneration reactor through a pipeline, and a heating section air outlet of the regeneration reactor is connected with an air inlet of the hot-blast stove through a pipeline, so that hot air generated by combustion in the hot-blast stove serves as an activated carbon regeneration heating medium to circulate in the regeneration reactor and the hot-blast stove; a pressure transmitter is arranged in the regeneration reactor, an SO2 concentration detector and a regeneration outlet CO concentration detector are arranged on a heating section air outlet pipeline of the regeneration reactor, a hot blast stove outlet CO concentration detector is arranged on a hot blast stove air outlet pipeline, and all the instruments are electrically connected with a controller. The method is used for judging whether the regeneration reactor heating pipe is damaged according to detection values of instruments.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive flue gas treatment and energy conservation in air pollution control, and relates to an activated carbon regeneration heating system with a broken pipe diagnosis function. Background Art

[0002] The integrated activated carbon flue gas comprehensive treatment technology has been widely used in air pollution prevention and control. Especially in industries such as metallurgy, steel, and power, good results have been achieved in the integrated treatment of flue gas pollutants such as flue gas desulfurization, denitrification, and dust removal.

[0003] At present, the vast majority of the regeneration of activated carbon uses the thermal regeneration method. The saturated activated carbon that has absorbed pollutants is heated to about 400°C in the heating section of the regeneration reactor, so that the pollutants are decomposed and desorbed, and the activated carbon can be restored to its activity. The heating of activated carbon generally uses a shell-and-tube heat exchanger. The activated carbon generally flows through the tube side, and the heating medium flows through the shell side. After the heating medium in the original activated carbon regeneration heating exchanges heat with the activated carbon, it is basically directly discharged, resulting in the waste of this part of the available heat energy.

[0004] In addition, during the actual operation process, due to reasons such as corrosion, wear, and stress influence, the heating tubes may be damaged or even disconnected. Since the heating medium contains a certain amount of oxygen, when the heating tube is damaged, the heating medium will enter the activated carbon side, resulting in the oxidation of the activated carbon, and even causing serious safety accidents such as fire. At the same time, it may also cause a large amount of chemical loss of the activated carbon due to oxidation. In addition, when the heat exchange tube ruptures, a large amount of activated carbon enters the shell side heating medium side, generating a large amount of CO, etc. due to oxidation, affecting the safety of the heating system pipeline, and even causing serious production accidents such as explosion. Due to structural limitations, it is difficult for the traditional activated carbon regeneration reaction system to timely detect the damage and breakage of the heating tubes, so it is difficult to ensure the safe operation of the regeneration heating system. Content of the Utility Model

[0005] The utility model provides an activated carbon regeneration heating system. The heating medium circulation system can make the activated carbon regeneration heating medium be recycled, and the heating tube breakage diagnosis system can monitor the operation safety of the regeneration heating system in real time, so that when the regeneration heating tube is damaged, it can be diagnosed and warned in time.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An activated carbon regeneration heating system includes a heating medium circulation system and a heating tube breakage diagnosis system; the heating medium circulation system at least includes a regeneration reactor and a hot blast stove, the air outlet of the hot blast stove is connected to the heating section air inlet of the regeneration reactor through a pipeline, and the heating section air outlet of the regeneration reactor is connected to the air inlet of the hot blast stove through a pipeline, so as to make the hot air generated by combustion in the hot blast stove serve as the activated carbon regeneration heating medium and circulate in the regeneration reactor and the hot blast stove; the heating tube breakage diagnosis system at least includes a pressure transmitter arranged in the regeneration reactor, a SO2 concentration detector arranged on the pipeline of the heating section air outlet of the regeneration reactor, a regeneration outlet CO concentration detector, a hot blast stove outlet CO concentration detector arranged on the pipeline of the air outlet of the hot blast stove, and a controller electrically connected to the above-mentioned various instruments respectively, so as to judge whether the heating tube of the regeneration reactor is damaged according to the detection values of each instrument.

[0008] Further, the heating medium circulation system further includes a combustion-supporting air heater, the combustion-supporting air heater is connected to the heating section air outlet of the regeneration reactor through a pipeline, and a pressure regulating valve is arranged on the connecting pipeline between the two. The combustion-supporting air heater is also connected to the activated carbon flue gas treatment device through a pipeline, so as to make the surplus externally discharged circulating hot air enter the combustion-supporting air heater, exchange heat and cool down with the combustion-supporting air, and then be transported back to the desulfurization process of the activated carbon flue gas treatment device; the combustion-supporting air heater is also connected to the combustion-supporting gas inlet of the hot blast stove through a pipeline, so as to supply combustion-supporting air to the hot blast stove.

[0009] Further, the heating tube breakage diagnosis system further includes a hot air circulation pressure detector arranged on the pipeline of the heating section air outlet of the regeneration reactor, and both the hot air circulation pressure detector and the pressure regulating valve are electrically connected to the controller.

[0010] Further, the controller controls and adjusts the pressure regulating valve according to the pressure detection difference between the pressure transmitter and the hot air circulation pressure detector.

[0011] Further, a hot air circulation fan is arranged on the connecting pipeline between the heating section air outlet and the air inlet of the hot blast stove.

[0012] Further, a combustion-supporting fan is arranged on the connecting pipeline between the combustion-supporting air heater and the combustion-supporting gas inlet of the hot blast stove.

[0013] Further, the gas used in the hot blast stove can at least select one of blast furnace gas, coke oven gas, natural gas, and converter gas.

[0014] The beneficial effects of the present utility model include:

[0015] By designing a heating medium circulation system, the hot air generated by combustion in the hot blast stove can be used as the heating medium for activated carbon regeneration and can be recycled in the regeneration reactor and the hot blast stove, avoiding the waste of thermal energy caused by the direct discharge of the heating medium after heat exchange in the traditional method and improving the thermal energy utilization efficiency. A heating pipe breakage diagnosis system is set up. Through the coordinated work of equipment such as pressure transmitters, SO2 concentration detectors, CO concentration detectors at the regeneration outlet, CO concentration detectors at the hot blast stove outlet, and controllers, it can monitor and judge in real time whether the heating pipe is damaged. That is, if the pressure value detected by the pressure transmitter in the regeneration reactor suddenly decreases and meets any one of the following two conditions, it is judged that the heating pipe is damaged: Condition (1) is that the difference between the CO concentration at the regeneration outlet and the CO concentration at the hot blast stove outlet exceeds 50 mg / m 3 ; Condition (2) is that the SO2 concentration in the hot air of the regeneration reactor exceeds the set value; thus, the operation safety of the regeneration heating system can be monitored in real time, enabling timely diagnosis and warning when the regeneration heating pipe is damaged, prompting the operator to handle it in time, and improving the safety and stability of the system.

[0016] In addition, a combustion-supporting air heater is set in the heating medium circulation system, which can use the excess recycled hot air discharged to heat the combustion-supporting air. At the same time, the hot air after heat exchange with the combustion-supporting air is transported back to be processed before the desulfurization process of the activated carbon flue gas treatment device, ensuring that there is no direct emission of waste gas in the regeneration heating system, which is environmentally friendly and energy-saving. And by detecting the pressure P1 in the regeneration reactor through the pressure transmitter in the regeneration reactor and detecting the pressure P2 of the circulating hot air leaving the regeneration reactor through the hot air circulation pressure detector, the controller controls the pressure difference P1 - P2>200 Pa by adjusting the opening of the pressure regulating valve to ensure that the circulating hot air pressure is lower than the pressure in the regeneration reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall system structure of the present utility model.

[0018] In the figure: 10 - regeneration reactor, 101 - heating section, 201 - hot air circulation fan, 202 - hot blast stove, 203 - combustion-supporting fan, 204 - combustion-supporting air heater, 30 - controller, 301 - SO2 concentration detector, 302 - pressure transmitter, 303 - hot air circulation pressure detector, 304 - pressure regulating valve, 305 - CO concentration detector at the hot blast stove outlet, 306 - CO concentration detector at the regeneration outlet. DETAILED DESCRIPTION OF THE INVENTION

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with 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 efforts shall fall within the protection scope 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] Embodiment 1

[0022] This embodiment provides an activated carbon regeneration heating system with a heating tube breakage diagnosis function, mainly including a heating medium circulation system and a heating tube breakage diagnosis system;

[0023] As Figure 1 shown, the heating medium circulation system includes a regeneration reactor 10, a hot blast stove 202, a combustion air heater 204, a hot air circulation fan 201, a combustion support fan 203 and related pipelines; the air outlet of the hot blast stove 202 is connected to the air inlet of the heating section 101 of the regeneration reactor 10 through a pipeline, and the air outlet of the heating section 101 of the regeneration reactor 10 is connected to the air inlet of the hot blast stove 202 through a pipeline, and a hot air circulation fan 201 is provided on this section of the connecting pipeline to make the hot air generated by combustion in the hot blast stove 202 circulate as the activated carbon regeneration heating medium in the regeneration reactor 10 and the hot blast stove 202; the combustion air heater 204 is connected to the air outlet of the heating section 101 of the regeneration reactor 10 through a pipeline, and a pressure regulating valve 304 is provided on the connecting pipeline between the two. The combustion air heater 204 is also connected to the activated carbon flue gas treatment device through a pipeline to make the excess circulating hot air discharged externally enter the combustion air heater 204 to exchange heat and cool down with the combustion air and then be transported back to the desulfurization process of the activated carbon flue gas treatment device; the combustion air heater 204 is also connected to the combustion support gas inlet of the hot blast stove 202 through a pipeline, and a combustion support fan 203 is provided on this connecting pipeline to supply combustion support air to the hot blast stove 202.

[0024] Based on the above solution, the hot blast stove 202 uses one of blast furnace gas, coke oven gas, natural gas, and converter gas as fuel. The hot air generated is mixed with the recycled hot air, and the temperature after mixing is 450°C. It enters the heating section 101 of the regeneration reactor 10 and exchanges heat with activated carbon, and the temperature is about 330°C. Then it is sent into the hot blast stove 202 through the hot air circulation fan 201 for recycling. The excess recycled hot air discharged enters the combustion air heater 204 to exchange heat with the combustion air. After the temperature drops to about 120°C, it is sent back before desulfurization of the activated carbon flue gas treatment device. The activated carbon flue gas treatment device processes the excess recycled hot air generated by the regeneration heating system to ensure that there is no direct emission of waste gas from the regeneration heating system. The external air is heated by the recycled hot air passing through the combustion air heater 204 and then pumped into the hot blast stove 202 by the combustion air blower 203 for combustion support.

[0025] The heating tube breakage diagnosis system includes a pressure transmitter 302 installed in the regeneration reactor 10, an SO2 concentration detector 301 installed on the outlet pipeline of the heating section 101 of the regeneration reactor 10, a regeneration outlet CO concentration detector 306, a hot air circulation pressure detector 303, and a hot blast stove outlet CO concentration detector 305 installed on the outlet pipeline of the hot blast stove 202. And a controller 30 electrically connected to each of the above instruments respectively. The controller 30 is also electrically connected to a pressure regulating valve 304. Among them, the controller 30 is controlled by an independent PLC or extended through the control system of the desulfurization and denitration device. The controller 30 monitors and records the operating status of the equipment in the regeneration heating system, processes and calculates the detected pressure and concentration signals, and performs logical operations and judgments based on the difference between the detected value and the set value, so as to diagnose whether there is a breakage in the heating tube. If it is determined that there is a breakage, an audible and visual alarm is given to prompt the operator to handle it in time. At the same time, preferably, the controller 30 also performs safety interlocking according to the gas concentration. When the detection data of the hot blast stove outlet CO concentration detector 305 exceeds the set value, the gas and combustion air of the hot blast stove are closed to ensure system safety.

[0026] Based on the above solution, the pressure P1 in the regeneration reactor is detected by the pressure transmitter 302 in the regeneration reactor 10, and the pressure P2 of the recycled hot air leaving the regeneration reactor is detected by the hot air circulation pressure detector 303. The controller 30 controls the pressure difference P1 - P2 > 200 Pa by adjusting the opening of the pressure regulating valve 304 to ensure that the hot air pressure is lower than the pressure in the regeneration reactor.

[0027] The concentration of CO in the hot air at the outlet of the hot blast stove is monitored by the hot blast stove outlet CO concentration detector 305, and the concentration of CO in the hot air at the regeneration outlet is monitored by the regeneration outlet CO concentration detector 306. When the heating tube is damaged, the CO concentration at the regeneration outlet will be greater than the CO concentration at the hot blast stove outlet. Detect the difference between the two. If there is an abnormal increase, it indicates that the heating tube may be damaged. It is set that the difference exceeds 50 mg / m 3An alarm reminder will be given. Preferably, the CO concentration in the hot air can be set for alarm simultaneously. When the concentration exceeds 10% of the lower explosion limit, the system will give an audible and visual alarm. When it exceeds 20% of the lower explosion limit, the entire regeneration heating system will be interlocked to stop.

[0028] The SO2 concentration in the hot air of the regeneration reactor is detected by the SO2 concentration detector 301. When the heating tube is damaged, since the hot air pressure is lower than the pressure inside the regeneration reactor, the SO2 generated during regeneration will enter the heating medium circulation system, resulting in an abnormal increase in the SO2 concentration in the hot air. Thus, it is determined that the heating tube may be damaged. In this embodiment, the set alarm value of the SO2 concentration is 200mg / m 3 。

[0029] The diagnosis logic for heating tube damage is as follows: Any one of the following two conditions is satisfied, and the pressure inside the regeneration reactor 10 suddenly drops:

[0030] (1) The difference between the CO concentration at the regeneration outlet and the CO concentration at the hot blast stove outlet exceeds 50mg / m 3 ;

[0031] (2) The SO2 concentration in the hot air of the regeneration reactor exceeds the set value.

[0032] In this regeneration heating system, the heating medium that was originally directly discharged redundantly in the regeneration heating section is used to heat the combustion-supporting air, and then discharged into the desulfurization system to prevent environmental pollution. A pressure detector and a control valve are set on the heating medium circulation pipeline to control the heating medium pressure to be lower than the pressure on the activated carbon side inside the regeneration reactor; an SO2 concentration detector and a CO concentration detector are set, and together with the controller, they form a diagnosis and control system for heating tube damage. This system as a whole has the following advantages:

[0033] (1) Through the activated carbon regeneration heating system with the function of diagnosing heating tube damage of the present utility model, the operation safety of the regeneration heating system is monitored in real time, so that when the regeneration heating tube is damaged, it can be diagnosed and warned in time, prompting the operator to handle it in time, and the safety performance is greatly improved.

[0034] (2) The explosive substances in the circulating hot air are monitored online and interlocked to ensure the safe operation of the heating system.

[0035] (3) The energy of the discharged hot air is recovered and utilized, and the hot air is discharged into the inlet of the desulfurization device to ensure that there is no direct emission of waste gas from the heating system, which is environmentally friendly and energy-saving.

[0036] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. An activated carbon regeneration heating system, characterized in that, It includes a heating medium circulation system and a heating tube breakage diagnosis system; the heating medium circulation system at least includes a regeneration reactor (10) and a hot blast stove (202), the air outlet of the hot blast stove (202) is connected to the air inlet of the heating section (101) of the regeneration reactor (10) through a pipeline, and the air outlet of the heating section (101) of the regeneration reactor (10) is connected to the air inlet of the hot blast stove (202) through a pipeline, so as to make the hot air generated by combustion in the hot blast stove (202) circulate as the activated carbon regeneration heating medium in the regeneration reactor (10) and the hot blast stove (202); the heating tube breakage diagnosis system at least includes a pressure transmitter (302) arranged in the regeneration reactor (10), an SO2 concentration detector (301), a regeneration outlet CO concentration detector (306) arranged on the pipeline of the air outlet of the heating section (101) of the regeneration reactor (10), and a hot blast stove outlet CO concentration detector (305) arranged on the pipeline of the air outlet of the hot blast stove (202), and a controller (30) electrically connected to the above-mentioned various instruments respectively, so as to judge whether the heating tube of the regeneration reactor (10) is damaged according to the detection values of each instrument.

2. The activated carbon regeneration heating system according to claim 1, wherein The heating medium circulation system further includes a combustion air heater (204), the combustion air heater (204) is connected to the air outlet of the heating section (101) of the regeneration reactor (10) through a pipeline, and a pressure regulating valve (304) is arranged on the connecting pipeline between the two. The combustion air heater (204) is also connected to the activated carbon flue gas treatment device through a pipeline, so as to make the excess circulating hot air discharged enter the combustion air heater (204) to exchange heat with the combustion air and cool down, and then be transported back to the desulfurization process of the activated carbon flue gas treatment device; the combustion air heater (204) is also connected to the combustion air inlet of the hot blast stove (202) through a pipeline, so as to supply combustion air to the hot blast stove (202).

3. The activated carbon regeneration heating system according to claim 2, wherein, The heating tube breakage diagnosis system further includes a hot air circulation pressure detector (303) arranged on the pipeline of the air outlet of the heating section (101) of the regeneration reactor (10), and both the hot air circulation pressure detector (303) and the pressure regulating valve (304) are electrically connected to the controller (30).

4. The activated carbon regeneration heating system according to claim 3, wherein, The controller (30) controls and adjusts the pressure regulating valve (304) according to the pressure detection difference between the pressure transmitter (302) and the hot air circulation pressure detector (303).

5. The activated carbon regeneration heating system according to claim 1, characterized in that, A hot air circulation fan (201) is arranged on the connecting pipeline between the air outlet of the heating section (101) and the air inlet of the hot blast stove (202).

6. The activated carbon regeneration heating system according to claim 2, wherein, A combustion air blower (203) is arranged on the connecting pipeline between the combustion air heater (204) and the combustion air inlet of the hot blast stove (202).

7. An activated carbon regeneration heating system according to any one of claims 1-6, characterized in that, The gas used in the hot blast stove (202) can at least select one of blast furnace gas, coke oven gas, natural gas, and converter gas.

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