Reversible carbonization rotary kiln tail gas incineration device and tail gas incineration process thereof

Abstract

The present invention provides a reversible carbonization rotary kiln tail gas incineration device and a tail gas incineration process thereof, the device comprises a carbonization converter, a burner heat storage chamber, an incinerator, a waste heat boiler, and a fan, the carbonization converter comprises a burner, a middle part and a furnace tail, the burner is connected to the burner heat storage chamber, a discharging device is arranged below the burner, a feeding device is arranged above the furnace tail, the furnace tail is connected to the incinerator through a conversion flue, the incinerator is sequentially connected to the waste heat boiler and the fan through the flue, the incinerator is connected to the burner heat storage chamber through the conversion flue, and a flue gas steering control valve is arranged on the conversion flue to control the flue gas flow direction, so that the flue gas flow directions in the carbonization rotary kiln are switched mutually, and the utilization rate of the mixed flue gas in the carbonization converter is improved. The process of tail gas incineration using the device can effectively utilize the mixed flue gas formed by the carbonization converter to provide a heat source for the secondary combustion of the burner.

Description

Technical field:

[0001] The invention relates to the technical field of tail gas incineration and utilization, in particular to a reversible carbonization rotary kiln tail gas incineration device and a tail gas incineration process thereof. Background technology:

[0002] In the activated carbon production process, the carbonization stage is the process of grinding the coal for making activated carbon, adding high-temperature coal tar and using water as a binder, stirring, kneading, granulating, and initially drying the formed strips in the carbonization converter in an air-isolated heating and dry distillation process. That is, in the 350-650℃ temperature range formed at the head, middle, and tail of the carbonization converter, the volatile matter and water in the strips are analyzed out to obtain the carbonized material suitable for use in the SLEP activation furnace. Since the volatile matter and water in the strips need to be analyzed out and the carbonized material needs to be initially pore-formed in the carbonization stage, it is usually necessary to maintain 650℃ at the discharge end of the carbonization converter to meet the carbonization process standards. At this time, secondary combustion is required at the head of the carbonization converter.

[0003] The raw materials for the secondary combustion of the furnace head are mostly natural gas, coal gas, and high calorific value coal blocks, which are used in huge quantities and increase the production costs of enterprises. The mixed flue gas formed by the carbonization converter has a high enthalpy value. If it is not used, it will cause energy waste. At the same time, the mixed flue gas is mostly water vapor, H2, CO, CH4 and aromatic compounds, which have high calorific value and are easy to burn. They are good raw materials for the secondary combustion of the furnace head. However, if the tail gas at the tail of the furnace is directly led to the furnace head, the aromatic compounds in the tail gas will condense on the wall of the gas intake pipe when it is cold, which is easy to cause the pipe wall to be blocked, making it difficult to control the positive pressure and temperature of the furnace head. Summary of the invention:

[0004] The purpose of the present invention is to solve the problem of unutilized or poorly utilized tail gas in the prior art, and to propose a reversible carbonizing rotary kiln tail gas incineration device and a process for incinerating tail gas. The device can switch the flue gas steering control valve to cyclically switch the flow direction of the flue gas in the carbonizing converter, thereby realizing the cyclic supplementary combustion and energy recovery of the carbonizing converter, efficiently utilizing the mixed flue gas and reducing production costs.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention designs a reversible carbonization rotary kiln tail gas incineration and utilization device, which includes a carbonization converter, a burner heat storage chamber, an incinerator, a waste heat boiler, and a fan. The carbonization converter includes a burner, a middle part and a furnace tail. The burner is connected to the burner heat storage chamber. A discharging device is arranged below the burner, and a feeding device is arranged above the furnace tail. The furnace tail is connected to the incinerator through a conversion flue. The incinerator is connected to the waste heat boiler and the fan in sequence through the flue. The incinerator is connected to the burner heat storage chamber through a conversion flue. A flue gas diverting control valve is arranged on the conversion flue, and a dust collector and a desulfurization and denitrification device are arranged after the fan.

[0007] Furthermore, an oxygen content monitoring device is provided in the carbonizing converter to effectively control the burning loss of the carbonized material in the carbonizing section.

[0008] Furthermore, a temperature control device, a smoke pressure detection device, and a flame detection device are arranged side by side on the upper part of the burner head heat storage chamber, and a quantitative air supply device is installed on the side where the burner head heat storage chamber is connected to the conversion flue.

[0009] The second aspect of the present invention provides a process for incinerating tail gas using the above-mentioned reversible carbonization rotary kiln tail gas incineration and utilization device, and the steps of the process include:

[0010] S1: When the temperature in the furnace head regenerator is lower than the set temperature of 600℃-700℃, open the flue gas diversion control valve between the furnace head regenerator and the incinerator, and close the flue gas diversion control valve between the carbonization converter tail and the incinerator;

[0011] The details are as follows:

[0012] 1) The carbonization flue gas in the carbonization converter flows reversely in the carbonization converter to the burner head regenerator and burns in the burner head regenerator;

[0013] 2) The tail gas generated by the dry distillation flue gas after combustion enters the incinerator for oxidation and combustion;

[0014] 3) The tail gas after oxidation and combustion is collected in the waste heat boiler;

[0015] 4) The exhaust gas after collecting the waste heat is transported to the dust collector and desulfurization and denitrification device through the fan for dust removal and desulfurization and denitrification treatment before being discharged.

[0016] S2: When the temperature in the furnace head regenerator is higher than the set temperature of 600℃-700℃, the flue gas diversion control valve between the furnace tail and the incinerator is opened, and the flue gas diversion control valve between the furnace head regenerator and the incinerator is closed;

[0017] The details are as follows:

[0018] 1) Flue gas flows from the regenerator of the burner head to the burner head, maintaining the temperature of the discharge end of the burner head, and the remaining tail gas flows to the tail of the furnace;

[0019] 2) The remaining tail gas in the furnace tail flows to the incinerator through the conversion flue, and the remaining tail gas is oxidized and burned in the incinerator;

[0020] 3) The remaining tail gas after oxidation and combustion enters the waste heat boiler, and the waste heat is collected by the waste heat boiler;

[0021] 4) The remaining tail gas after collecting the waste heat is transported to the dust collector and the desulfurization and denitrification device through a fan for dust removal and desulfurization and denitrification treatment before being discharged.

[0022] S3: The above steps of S1 and S2 are repeated to switch the flue gas diversion control valves between the burner head regenerator and the incinerator, and between the furnace tail and the incinerator, so that the burner head regenerator can circulate heat storage and supplementary combustion.

[0023] The invention provides a reversible carbonization rotary kiln tail gas incineration device and a tail gas incineration process thereof, which has the following beneficial effects:

[0024] (1) By using devices such as temperature control devices, smoke pressure detection devices, flame detection devices and system logic controllers, the flue gas diversion control valves between the furnace head regenerator and the incinerator, and between the carbonization converter furnace tail and the incinerator are opened and closed in a cycle, so that the furnace head regenerator can circulate heat storage and reburn, and the mixed flue gas generated in the carbonization converter is efficiently utilized, which solves the problem of the external heat source for the secondary reburning of the carbonization converter furnace head, reduces the coal consumption of each carbonization converter furnace head by 1.5T / d, and saves enterprise costs.

[0025] (2) The problem of burning carbonized materials in the carbonization converter is solved by directional combustion in the regenerator of the carbonization furnace head. In addition, since the speed of heat transfer from the furnace head flue gas to the lower stage is reduced, the flue gas volume in the carbonization converter is increased, and the temperature of the carbonization converter discharge section is increased, which effectively increases the output of the carbonization converter. Description of the drawings:

[0026] Figure 1 It is a structural schematic diagram of a reversible carbonization rotary kiln tail gas incineration and utilization device of the present invention;

[0027] Figure 2 It is a schematic diagram of the flue gas flow direction when the burner head regenerator stores heat in the process of the reversible carbonization rotary kiln tail gas incineration device of the present invention;

[0028] Figure 3 It is a schematic diagram of the flue gas flow direction during supplementary combustion in the burner head regenerator of a reversible carbonization rotary kiln tail gas incineration device of the present invention;

[0029] Figure 4 It is a flow chart of a process for incinerating tail gas by a reversible carbonization rotary kiln tail gas incineration device of the present invention;

[0030] In the figure: carbonization converter 1, burner head heat storage chamber 2, burner head 3, furnace tail 4, incinerator 5, waste heat boiler 6, fan 7, oxygen content monitoring device 8, temperature control device 9, smoke pressure detection device 10, flame detection device 11, quantitative air supply device 12, conversion flue 13, flue gas steering control valve 14, dust collector 15, desulfurization and denitrification device 16, discharge device 17, and feeding device 18. Specific implementation method:

[0031] Example 1

[0032] Reference Figure 1 The present embodiment provides a reversible carbonization rotary kiln tail gas incineration and utilization device, which includes a carbonization converter 1, a burner heat storage chamber 2, an incinerator 5, a waste heat boiler 6, and a fan 7. The carbonization converter includes a burner 3, a middle part and a furnace tail 4. The burner 3 is connected to the burner heat storage chamber 2, and a discharge device 17 is arranged below the burner 3; a feeding device 18 is arranged above the furnace tail 4, and the furnace tail 4 is connected to the incinerator 5 through a conversion flue 13; the incinerator 5 is connected to the waste heat boiler 6 and the fan 7 in sequence through the flue, and the incinerator 5 is connected to the burner heat storage chamber 2 through the conversion flue 13.

[0033] An oxygen content monitoring device 8 is arranged in the carbonization converter 1 to ensure that the oxygen content in the carbonization converter is not higher than 8%, which can effectively prevent the carbonization material from burning out in the carbonization section. A temperature control device 9, a smoke pressure detection device 10, and a flame detection device 11 are arranged side by side on the upper part of the burner regenerator 2, which can quickly and conveniently detect the temperature and smoke pressure in the burner regenerator. A quantitative air supply device 12 is installed at one side where the burner regenerator 2 is connected to the conversion flue 13.

[0034] A flue gas steering control valve 14 is provided on the conversion flue 13 to realize the flue gas direction conversion in the whole device. A dust collector 15 and a desulfurization and denitration device 16 are provided after the fan 7 to remove dust and desulfurize and denitrate the tail gas delivered by the fan 7 and discharge it after meeting the standards.

[0035] Example 2

[0036] Reference Figure 2 , Figure 3 and Figure 4The present embodiment provides a process for incinerating tail gas by using a reversible carbonizing rotary kiln tail gas incineration device. When the temperature in the burner head regenerator 2 is lower than 650°C, the flue gas diversion control valve 14 between the burner head regenerator 2 and the incinerator 5 is opened, and the flue gas diversion control valve 14 between the furnace tail 4 and the incinerator 5 is closed. The dry distillation flue gas in the carbonizing converter 1 flows reversely to the burner head regenerator 2 in the carbonizing converter 1 and burns in the burner head regenerator 2. The generated tail gas enters the incinerator 5 for oxidation and combustion, and then enters the waste heat boiler 6 for waste heat collection. Then, it is transported to the bag filter 15 and the desulfurization and denitrification device 16 through the fan 7, and is discharged after dust removal and desulfurization and denitrification treatment. The flue gas flows clockwise in the reversible carbonizing rotary kiln tail gas incineration and utilization device, the burner head regenerator 2 stores heat, and the flue gas in the carbonizing converter 1 is efficiently utilized.

[0037] When the temperature in the furnace head regenerator 2 is higher than 650℃, the flue gas diversion control valve 14 between the furnace tail 4 and the incinerator 5 is opened, and the flue gas diversion control valve 14 between the furnace head regenerator 2 and the incinerator 5 is closed, and the flue gas flows from the furnace head regenerator 2 to the furnace head 3, maintaining 650℃ at the furnace head discharge end, 450℃ in the middle, and 350℃ at the furnace tail. The remaining tail gas flows through the furnace tail 4 and the conversion flue 13 to the incinerator 5 for oxidation and combustion. The remaining tail gas after oxidation and combustion enters the waste heat boiler 6. After the waste heat is collected by the waste heat boiler 6, it is transported to the bag filter 15 and the desulfurization and denitration device 16 through the fan 7 for dust removal and desulfurization and denitration treatment before being discharged. The flue gas diversion control valve 14 is opened and closed by the temperature control device and the system logic controller to complete the conversion of the flue gas flow direction, and realize the heat storage and supplementary combustion of the furnace head regenerator 2.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reversible carbonization rotary kiln tail gas incineration and utilization device, comprising a carbonization converter (1), a burner head heat storage chamber (2), an incinerator (5), a waste heat boiler (6), and a fan (7), wherein the carbonization converter (1) comprises a burner head (3), a middle part and a furnace tail (4), and is characterized in that: The furnace head (3) is connected to the furnace head heat storage chamber (2), and a discharge device (17) is provided below the furnace head (3); a feed device (18) is provided above the furnace tail (4), and the furnace tail (4) is connected to the incinerator (5) through a conversion flue (13); the incinerator (5) is connected to the waste heat boiler (6) and the fan (7) in sequence through the flue; A flue gas diversion control valve (14) is provided on the conversion flue (13) between the furnace tail (4) and the incinerator (5); the furnace head regenerator (2) is used to burn the dry distillation flue gas flowing in the carbonization converter (1) in a reverse direction, and is connected to the incinerator (5) through the conversion flue (13). A flue gas diversion control valve (14) is also provided on the conversion flue (13) on one side of the incinerator (5) close to the burner head regenerator (2); A dust collector (15) and a desulfurization and denitration device (16) are arranged behind the fan (7); The reversible type refers to realizing the periodic conversion between the reverse flow and the forward flow of the flue gas in the carbonization converter (1) by switching the flue gas diversion control valve (14).

2. The reversible carbonization rotary kiln tail gas incineration and utilization device according to claim 1 is characterized in that: An oxygen content monitoring device (8) is arranged in the carbonization converter (1).

3. The reversible carbonization rotary kiln tail gas incineration and utilization device according to claim 1 is characterized in that: A temperature control device (9), a smoke pressure detection device (10), and a flame detection device (11) are arranged side by side in the upper inner portion of the burner head heat storage chamber (2), and a quantitative air supply device (12) is installed on the side where the burner head heat storage chamber (2) is connected to the conversion flue (13).

4. A process for incinerating tail gas using a reversible carbonization rotary kiln tail gas incineration utilization device as claimed in any one of claims 1 to 3, characterized in that: The steps include: S1: The temperature is set to 600°C-700°C. When the temperature in the furnace head heat storage chamber (2) is lower than the set temperature, the flue gas diversion control valve (14) between the furnace head heat storage chamber (2) and the incinerator (5) is opened, and the flue gas diversion control valve (14) between the furnace tail (4) and the incinerator (5) is closed; the details are as follows: 1) The carbonization flue gas in the carbonization converter (1) flows in reverse direction in the carbonization converter (1) to the burner head heat storage chamber (2) and burns in the burner head heat storage chamber (2); 2) The tail gas generated after the combustion of the carbonization flue gas enters the incinerator (5) for oxidation and combustion; 3) The tail gas after oxidation and combustion is passed through a waste heat boiler (6) to collect waste heat; 4) The tail gas after collecting the waste heat is transported to the dust collector (15) and the desulfurization and denitration device (16) through the fan (7) for dust removal and desulfurization and denitration treatment before being discharged; S2: The temperature is set to 600°C-700°C. When the temperature in the furnace head heat storage chamber is higher than the set temperature, the flue gas diversion control valve (14) between the furnace tail (4) and the incinerator (5) is opened, and the flue gas diversion control valve (14) between the furnace head heat storage chamber (2) and the incinerator (5) is closed; the details are as follows: 1) Flue gas flows from the furnace head regenerator (2) to the furnace head (3) in a forward direction, maintaining the temperature of the furnace head (3) at the unloading end, and the remaining tail gas flows to the furnace tail (4); 2) The remaining tail gas flows into the incinerator (5) through the furnace tail (4) and the conversion flue (13), and the remaining tail gas is oxidized and burned in the incinerator (5); 3) The remaining tail gas after oxidation and combustion enters the waste heat boiler (6), and the waste heat is collected by the waste heat boiler (6); 4) The remaining tail gas after collecting the waste heat is transported to the dust collector (15) and the desulfurization and denitration device (16) through the fan (7) for dust removal and desulfurization and denitration treatment before being discharged; S3: Circulate steps S1 and S2, switch the flue gas diversion control valve (14) between the furnace head heat storage chamber (2) and the incinerator (5), and between the furnace tail (4) and the incinerator (5), so that the furnace head heat storage chamber (2) circulates heat storage and supplementary combustion.

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