Activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system

Abstract

The utility model provides an activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system which comprises a hot air collecting manifold communicated with a regeneration tower cooling section, and the hot air collecting manifold is communicated with a plurality of heat using branches which are independently arranged. The hot air collecting manifold is used for conveying the hot air collected by the hot air collecting manifold to each hot spot in the activated carbon / coke desulfurization and denitrification device; a pressure transmitter and a pressure control valve are arranged on the hot air collecting manifold and used for monitoring and adjusting the pressure in the hot air collecting manifold, and a control valve used for adjusting the distribution amount of hot air in the branch is arranged on each heat using branch; and the pressure transmitter, the pressure control valve and each control valve are electrically connected with the control system. According to the system, hot air which is directly discharged to the atmosphere originally at the cooling section of the regeneration tower is collected and then is utilized to other heat utilization points of the activated carbon / coke desulfurization and denitrification device, so that the waste of energy sources is reduced; meanwhile, through the control system, the heat comprehensive utilization system operates stably and safely, and normal operation of an original device is not affected.

Description

Technical Field

[0001] The utility model belongs to the field of comprehensive flue gas treatment and energy saving in air pollution control, and specifically relates to an activated carbon / coke desulfurization and denitration regeneration heat comprehensive utilization system. Background Art

[0002] With the improvement of the national requirements for air pollution control, the activated carbon (coke) dry desulfurization and denitrification technology has been widely used in the comprehensive treatment of industrial flue gas pollutants. Compared with the traditional wet method, this technology has the advantages of water saving, no solid waste generation, less wastewater, and the pollutant SO2 can eventually form resource products such as sulfuric acid or sodium metabisulfite. In recent years, it has been widely used in thermal power, steel, metallurgy and other industries.

[0003] After the activated carbon (coke) catalyst absorbs pollutants, it needs to enter the regeneration tower for regeneration. Generally, the thermal regeneration method is adopted, which needs to be heated to about 400℃ for regeneration and then cooled. The thermal system heating generally uses boiler flue gas heat exchange. The steel industry generally uses blast furnace gas or coke oven gas as fuel to generate hot air heating in the hot blast furnace. After heating and regeneration, the activated carbon catalyst is cooled in the cooling section of the regeneration tower and then re-enters the adsorption tower for recycling. Cooling is generally directly cooled by air.

[0004] After the air is heat-exchanged in the regeneration cooling section, hot air is formed. Since the temperature is not high (generally 100-250°C), it is basically not utilized and is mostly discharged directly into the atmosphere, which directly causes energy waste. At the same time, there are still some places in the activated carbon (coke) desulfurization and denitrification device that need to be heated, such as the ammonia-air mixture needs to be heated during denitrification, and the nitrogen sealed at the top of the activated carbon regeneration tower also needs to be heated to a certain temperature before entering the regeneration tower. The combustion-supporting air used for the hot air furnace in the device is also mostly not preheated.

[0005] Figure 1 It is a schematic diagram of the regeneration cooling, hot air furnace, and nitrogen heating process of the original system. As can be seen from the figure, the air enters the cooling section 102 of the regeneration tower 10 through the cooling fan 201, and the hot air formed after cooling the regenerated activated carbon is directly discharged. The upper nitrogen required for regeneration is heated by steam through the nitrogen heater 30 and then sent to the upper part of the regeneration tower 10. The regeneration heating section 101 is heated by the hot air furnace 40, and the high-temperature hot air is circulated through the hot air circulation fan 203. The fuel used is fuel gas, and the air enters the hot air furnace 40 through the combustion-supporting fan 202 to assist in combustion. In the process of the original system, steam heating is used for nitrogen heating, and the combustion-supporting air is not heated.

[0006] Figure 2The figure is a schematic diagram of the denitration ammonia-air mixing process of the original system. As can be seen from the figure, the air is sent to the dilution air heater 50 through the ammonia dilution fan 204, and is mixed with the ammonia gas of the ammonia system after being heated by steam. The ammonia-air mixed gas is mixed evenly by the ammonia-air mixer 60 and then sent to the denitration system for denitration. In the original system, the dilution air needs to be heated by steam.

[0007] In summary, how to effectively utilize the regenerated energy, save energy and reduce consumption is an urgent problem to be solved in the activated carbon (coke) dry desulfurization and denitrification. Utility Model Content

[0008] In order to solve the problems existing in the prior art, the utility model provides an activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system, which collects the hot air generated in the regeneration cooling section and utilizes it in other hot spots of the activated carbon / coke desulfurization and denitrification device to make full use of the heat.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] An activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system comprises a hot air collecting manifold connected to a cooling section of a regeneration tower, the hot air collecting manifold is connected to a plurality of independently arranged heat-using branches for conveying the hot air collected by the hot air collecting manifold to various hot spots in an activated carbon / coke desulfurization and denitrification device; the hot air collecting manifold is provided with a pressure transmitter and a pressure control valve for monitoring and adjusting the pressure in the hot air collecting manifold, and each heat-using branch is provided with a control valve for adjusting the distribution amount of hot air in the branch; the pressure transmitter, the pressure control valve and each control valve are electrically connected to a control system.

[0011] Furthermore, the heat branch at least includes an upper nitrogen heating branch for regeneration, an ammonia-air mixing heating branch, and a hot blast furnace combustion-supporting air heating branch; the upper nitrogen heating branch for regeneration is connected to a nitrogen heater, and is used for heating the upper nitrogen of the regeneration tower in the activated carbon / coke desulfurization and denitrification device; the ammonia-air mixing heating branch is connected to an ammonia-air mixer through an ammonia dilution fan, and is used for diluting ammonia for denitrification in the activated carbon / coke desulfurization and denitrification device; the hot blast furnace combustion-supporting air heating branch is connected to a hot blast furnace through a combustion-supporting fan, and is used for the introduction of combustion-supporting air into the hot blast furnace in the activated carbon / coke desulfurization and denitrification device.

[0012] Furthermore, a temperature transmitter a and a control valve a are provided on the regeneration upper nitrogen heating branch, and an air intake branch a is connected to the regeneration upper nitrogen heating branch, and a temperature control valve a is provided on the air intake branch a; the temperature transmitter a, the temperature control valve a, and the control valve a are all electrically connected to the control system.

[0013] Furthermore, a temperature transmitter b and a control valve b are provided on the ammonia-air mixing heating branch, and the ammonia-air mixing heating branch is connected to an intake branch b, on which a temperature control valve b is provided; the temperature transmitter b, the temperature control valve b, and the control valve b are all electrically connected to the control system.

[0014] Furthermore, a control valve c is provided on the combustion-supporting air heating branch of the hot blast furnace, and an air intake branch c is connected to the combustion-supporting air heating branch of the hot blast furnace, and a control valve d is provided on the air intake branch c; the control valve c and the control valve d are both electrically connected to the control system.

[0015] Furthermore, the control system adopts an independent PLC system, or adopts the control system of the activated carbon / coke desulfurization and denitrification device for expansion.

[0016] The beneficial effects of the utility model include:

[0017] (1) Through the activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system of the utility model, the hot air originally discharged directly into the atmosphere from the cooling section of the regeneration tower is collected and utilized for other hot spots of the activated carbon / coke desulfurization and denitrification device, thereby saving energy and reducing energy waste; at the same time, through the control system, the heat comprehensive utilization system can operate stably and safely without affecting the normal operation of the original device.

[0018] (2) The hot air collecting manifold leads out a regenerated upper nitrogen heating branch, allowing the hot air to enter the nitrogen heater to replace the original steam heating; the hot air collecting manifold leads out an ammonia-air mixing heating branch, allowing the hot air to enter the ammonia-air mixer through the ammonia dilution fan, eliminating the original steam heating and dilution air heater; the original directly discharged waste hot air is fully utilized to replace high-quality heat source steam, saving a large amount of steam and reducing the operating costs of the desulfurization and denitrification equipment.

[0019] (3) The hot air collecting manifold leads out a hot air furnace combustion air heating branch, so that the hot air enters the hot air furnace through the combustion air fan, supplies combustion air to the hot air furnace, and uses recycled hot air to replace the original hot air furnace's normal temperature combustion air, saving gas consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the regenerative cooling, hot air furnace, and nitrogen heating process of the original system;

[0021] Figure 2 This is a schematic diagram of the denitrification ammonia air mixing process of the original system;

[0022] Figure 3 It is a schematic diagram of the structure of the utility model activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system.

[0023] In the figure: 10-regeneration tower, 101-regeneration tower heating section, 102-regeneration tower cooling section, 103-hot air collecting manifold, 201-cooling fan, 202-combustion-supporting fan, 203-circulation fan, 204-ammonia dilution fan, 30-nitrogen heater, 40-hot air furnace, 50-dilution air heater, 60-ammonia-air mixer, 70-control system, 801-pressure control valve, 802-control valve a, 803-temperature control valve a, 804-control valve b, 805-temperature control valve b, 806-control valve c, 807-control valve d, 901-pressure transmitter, 902-temperature transmitter a, 903-temperature transmitter b. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example 1

[0027] An activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system, such as Figure 3 As shown, it mainly includes: a hot air collection system, a heat comprehensive utilization branch and a control system 70.

[0028] The hot air collection system is composed of a hot air collection manifold 103, a pressure transmitter 901 and a pressure control valve 801 arranged on the hot air collection manifold 103. The hot air collection manifold 103 is connected to the regeneration tower cooling section 102, and the pressure transmitter 901 and the pressure control valve 801 are electrically connected to the control system 70. The hot air generated by the regeneration cooling originally directly discharged from the regeneration tower cooling section 102 is collected through the hot air collection manifold 103, and then distributed to each hot spot in the activated carbon / coke desulfurization and denitrification device. The pressure transmitter 901 measures the pressure in the hot air collection manifold 103 and transmits the pressure value signal to the control system 70. The pressure in the hot air collection manifold 103 is controlled by adjusting the pressure control valve 801 through the control system 70, and at the same time, it is ensured that the system can be directly emptied when a fault occurs. Under normal circumstances, the control pressure is greater than the pressure required for the fan-free branch in the heat branch. In this example, the control pressure is 1.2KPaG.

[0029] The heat comprehensive utilization branch is a heat-using branch for comprehensively utilizing the collected hot air in the activated carbon / coke desulfurization and denitrification device. Each heat-using branch is connected to the hot air collection manifold 103 to transport the hot air collected by the hot air collection manifold 103 to each hot spot in the activated carbon / coke desulfurization and denitrification device, including but not limited to the following heat-using branches:

[0030] Branch 1, regeneration upper nitrogen heating branch: The regeneration upper nitrogen heating branch is connected to the nitrogen heater 30, and the hot air is used to heat the upper nitrogen of the regeneration tower in the activated carbon / coke desulfurization and denitrification device, replacing the original steam heating. The regeneration upper nitrogen heating branch is provided with a temperature transmitter a902 and a control valve a802, and the regeneration upper nitrogen heating branch is connected to an air intake branch a, and the air intake branch a is provided with a temperature control valve a803; the temperature transmitter a902, the temperature control valve a803, and the control valve a802 are all electrically connected to the control system 70. In order to ensure that the temperature does not exceed the limit, the temperature transmitter a902 and the temperature control valve a803 are set to form a temperature control loop, that is, the temperature transmitter a902 measures the temperature of the upper nitrogen heating branch of the regeneration, and transmits the measured temperature value signal to the control system 70. When the temperature is too high, the control system 70 controls the temperature control valve a803 to open, and mixes air into the upper nitrogen heating branch of the regeneration through the air intake branch a to cool it down. The function of the control valve a802 is to adjust the distribution amount of hot air in this branch, and to close the heating air of this branch under special circumstances.

[0031] Branch 2, ammonia-air mixed heating branch: The ammonia-air mixed heating branch is connected to the ammonia-air mixer 60 through the ammonia dilution fan 204. The hot air is used to dilute the ammonia for denitration in the activated carbon / coke desulfurization and denitration device, and the original steam heating and dilution air heater 50 are eliminated. The ammonia-air mixed heating branch is provided with a temperature transmitter b903 and a control valve b804, and the ammonia-air mixed heating branch is connected to an air intake branch b, and the air intake branch b is provided with a temperature control valve b805; the temperature transmitter b903, the temperature control valve b805, and the control valve b804 are all electrically connected to the control system 70. In order to ensure that the temperature does not exceed the limit, the temperature transmitter b903 and the temperature control valve b805 are set to form a temperature control loop, that is, the temperature transmitter b903 measures the temperature of the ammonia-air mixed heating branch and transmits the measured temperature value signal to the control system 70. When the temperature is too high, the control system 70 controls the temperature control valve b805 to open, and mixes air into the ammonia-air mixed heating branch through the intake branch b to cool it down. The function of the control valve b804 is to adjust the distribution of hot air in this branch, and to close the heating air of this branch under special circumstances.

[0032] Branch 3, hot blast furnace combustion-supporting air heating branch: The hot blast furnace combustion-supporting air heating branch is connected to the hot blast furnace 40 through the combustion-supporting air fan 202, and the hot air is used for the combustion-supporting air of the hot blast furnace 40 in the activated carbon / coke desulfurization and denitrification device. A control valve c806 is provided on the hot blast furnace combustion-supporting air heating branch, and an air intake branch c is connected to the hot blast furnace combustion-supporting air heating branch, and a control valve d807 is provided on the air intake branch c; the control valve c806 and the control valve d807 are both electrically connected to the control system 70. Because the temperature of the hot air generated by regenerative cooling is lower than 250°C, this branch does not require temperature control. The function of the control valve c806 is to adjust the distribution amount of hot air in this branch, and to close the hot air supply of this branch under special circumstances. The function of the control valve d807 is to open the control valve d807 when the control valve c806 is closed, to ensure the supply of combustion-supporting air for the hot blast furnace and to ensure the safety of the hot blast furnace.

[0033] The control system 70 is used for the temperature control loop, pressure control loop, and safety system control, the display of the equipment operation status, alarm, interlocking, etc. in the heat comprehensive utilization system; and the allocation and management of the heat of each hot spot in the heat comprehensive utilization system. The control system can be controlled by an independent PLC system, or it can be expanded with the help of the control system of the activated carbon desulfurization and denitrification device. The control system controls the amount of hot air used in each heat branch by controlling the opening of the control valves a802, b804, and c806. Since the amount of hot air used for regeneration cooling is greater than the sum of the amounts used in the above heat branches, the excess hot air is discharged through the pressure control valve 801.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system, characterized in that: The invention comprises a hot air collecting manifold (103) connected to the cooling section (102) of the regeneration tower, and a plurality of heat-using branches which are independently arranged are connected to the hot air collecting manifold (103) for conveying the hot air collected by the hot air collecting manifold (103) to various hot spots in the activated carbon / coke desulfurization and denitrification device; the hot air collecting manifold (103) is provided with a pressure transmitter (901) and a pressure control valve (801) for monitoring and adjusting the pressure in the hot air collecting manifold (103), and each heat-using branch is provided with a control valve for adjusting the distribution amount of the hot air in the branch; the pressure transmitter (901), the pressure control valve (801) and each control valve are electrically connected to the control system (70).

2. The activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system according to claim 1 is characterized in that: The heat-using branch at least comprises a regeneration upper nitrogen heating branch, an ammonia-air mixing heating branch, and a hot blast furnace combustion-supporting air heating branch; the regeneration upper nitrogen heating branch is connected to a nitrogen heater (30) and is used for heating the upper nitrogen of a regeneration tower in an activated carbon / coke desulfurization and denitrification device; the ammonia-air mixing heating branch is connected to an ammonia-air mixer (60) through an ammonia dilution fan (204) and is used for diluting ammonia for denitrification in the activated carbon / coke desulfurization and denitrification device; the hot blast furnace combustion-supporting air heating branch is connected to a hot blast furnace (40) through a combustion-supporting fan (202) and is used for introducing combustion-supporting air into the hot blast furnace (40) in the activated carbon / coke desulfurization and denitrification device.

3. The activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system according to claim 2 is characterized in that: The regeneration upper nitrogen heating branch is provided with a temperature transmitter a (902) and a control valve a (802), and the regeneration upper nitrogen heating branch is connected to an air intake branch a, and the air intake branch a is provided with a temperature control valve a (803); the temperature transmitter a (902), the temperature control valve a (803), and the control valve a (802) are all electrically connected to the control system (70).

4. The activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system according to claim 2 is characterized in that: The ammonia-air mixed heating branch is provided with a temperature transmitter b (903) and a control valve b (804), and the ammonia-air mixed heating branch is connected to an air intake branch b, and the air intake branch b is provided with a temperature control valve b (805); the temperature transmitter b (903), the temperature control valve b (805), and the control valve b (804) are all electrically connected to the control system (70).

5. The activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system according to claim 2 is characterized in that: The hot blast furnace combustion-supporting air heating branch is provided with a control valve c (806), and the hot blast furnace combustion-supporting air heating branch is connected to an air intake branch c, and the air intake branch c is provided with a control valve d (807); the control valve c (806) and the control valve d (807) are both electrically connected to the control system (70).

6. An activated carbon / coke desulfurization and denitrification regeneration heat comprehensive utilization system according to any one of claims 1 to 5, characterized in that: The control system (70) adopts an independent PLC system, or is expanded by adopting the control system of an activated carbon / coke desulfurization and denitrification device.

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