CN216997689U - Thermal cycle redox active carbon production system - Google Patents
Thermal cycle redox active carbon production system Download PDFInfo
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- CN216997689U CN216997689U CN202220242839.6U CN202220242839U CN216997689U CN 216997689 U CN216997689 U CN 216997689U CN 202220242839 U CN202220242839 U CN 202220242839U CN 216997689 U CN216997689 U CN 216997689U
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Abstract
The utility model discloses a thermal cycle redox active carbon production system, which comprises an activation furnace, wherein the activation furnace comprises a furnace body, a central combustion chamber and a plurality of activation channels which are circumferentially distributed on the periphery of the central combustion chamber are arranged in the furnace body, the central combustion chamber and the activation channels both axially extend along the furnace body, and the discharge end of each activation channel is communicated with the central combustion chamber; the feed end of the furnace body is provided with a negative pressure suction device communicated with the central combustion chamber and a steam supply device used for conveying water steam to the activation channel, and the negative pressure suction device is used for sucking air and activated tail gas generated in the activation channel into the central combustion chamber to burn and release heat so as to supply heat to the activation channel and the steam supply device. In the utility model, the central combustion chamber is positioned in the center of the furnace body, each activation channel is distributed on the periphery of the central combustion chamber, and the interior of each activation channel is uniformly heated; under the negative pressure suction, the high-temperature flue gas can not escape from the activation furnace, the utilization of the waste heat of the high-temperature flue gas is also carried out in the activation furnace or at the feed end, and the heat loss is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of activated carbon production, and particularly relates to a thermal cycle redox activated carbon production system.
Background
According to different heating modes, activated carbon activation equipment can be divided into internal heating type and external heating type. Wherein, traditional interior hot type activation equipment lets in high temperature steam in order to turn into the carbonization material with raw materials behind the raw materials burning, and the chemical reaction that takes place is mainly: c + HO2+O2→CO2+H2. The disadvantages of this activation method are: (1) because the oxygen content in the activation chamber is higher, the activation chamber still continuously burns in the early stage of activation, so that the consumption of the carbonized material is large, and the obtained carbon rate is low; (2) when the temperature in the activation chamber is reduced and the combustion is stopped, the carbonized material is reserved, but the activation rate of the obtained carbonized material is lower due to insufficient temperature; (3) high-temperature steam needs to be additionally provided in the activation chamber, so that the energy consumption is high; and the tail gas generated by the activation chamber can not be effectively utilized, thereby causing energy waste.
Compared with the internal heat type activation device, the external heat type activation device is greatly improved. The Chinese invention patent application with the publication number of CN113636553A discloses an external heat rotary type high-quality active carbon high-efficiency energy-saving environment-friendly production device, which comprises a cylindrical rotary activation furnace, wherein the rotary activation furnace comprises an activation cylinder, an annular hearth and a rotary furnace shell which are sequentially arranged from inside to outside, and the annular hearth consists of a plurality of annular combustion chambers which are axially arranged along the activation cylinder; according to the material moving direction, the activation cylinder comprises a feeding end, an warming area, an activation area, a cooling area and a discharging end; a furnace head cover and a furnace tail cover are respectively arranged at two ends of the activation cylinder, a feed hopper communicated with the feed end is arranged on the furnace head cover, and a temperature rising area of the activation cylinder is connected with an auxiliary gas source; the furnace tail cover is provided with a steam pipe which extends to the activation area along the axial direction of the activation cylinder and a discharge hopper which is communicated with the discharge end;
the device also comprises an activated tail gas recovery combustion system, wherein the activated tail gas recovery combustion system comprises a tail gas recovery pipe, a tail gas waste heat drying machine, a first cyclone dust collector, a first cooler, a second cooler, a high-temperature pressure fan, a main gas valve and one inlet of a three-way joint which are sequentially connected, the other inlet of the three-way joint is connected with an auxiliary gas valve, the outlet of the three-way joint is connected with the outer port of a tail gas inlet pipe, and the inner port of the tail gas inlet pipe is communicated with the reversing combustion chamber; the tail gas recovery pipe is communicated with the warming-up area of the activation cylinder;
when the device works, auxiliary fuel gas is firstly input into the annular combustion chambers through the auxiliary fuel gas valves, so that the outer peripheral walls of the activation cylinders corresponding to the annular combustion chambers are continuously heated, and the carbonized materials entering the activation areas are fully contacted with superheated steam and subjected to activation reaction to generate activated carbon and activated tail gas; the activated tail gas enters an activated tail gas recovery combustion system through a tail gas recovery pipe, on one hand, the purified tail gas enters an annular combustion chamber from a tail gas inlet pipe and is mixed and combusted with air to heat an activation cylinder, and on the other hand, the purified tail gas exchanges heat with circulating cooling water to obtain circulating hot water; the high-temperature flue gas generated by the combustion of the purified tail gas exchanges heat with circulating water from the activated tail gas recovery combustion system through a flue gas recovery heat exchange system to generate saturated water vapor at about 120 ℃; the saturated steam is sent into the annular steam superheater, and the annular steam superheater is arranged at the furnace tail of the activation cylinder and is positioned at the periphery of the activation cylinder, so that the saturated steam in the annular steam superheater can indirectly exchange heat with the outer peripheral wall of the activation cylinder to generate superheated steam at about 300 ℃, and the superheated steam enters an activation area of the activation cylinder through the steam pipe and reacts with a carbonized material to generate activated carbon and activated tail gas.
The external heat rotary type high-efficiency energy-saving environment-friendly production device for the high-quality activated carbon has the following defects: (1) only one activation cylinder with a relatively large inner diameter is arranged in the rotary activation furnace and is arranged in the center of the rotary activation furnace, the annular combustion chambers for heating the activation cylinder are arranged on the periphery of the activation cylinder, and all the annular combustion chambers are distributed along the axial direction of the activation cylinder at intervals; on one hand, the inner diameter of the activation cylinder is larger, the heat supply capacity of the annular combustion chambers arranged at the periphery to the center of the activation cylinder is more limited, and the annular combustion chambers are arranged at intervals, so that the condition of uneven heat supply exists in the circumferential direction of the activation cylinder; the loading capacity of the carbonized material in the activation cylinder is too large, and the situations of uneven heating and insufficient reaction are easy to occur; (2) activated tail gas generated by the activation reaction needs to be led out of the rotary activation furnace, and can return to the annular combustion chamber for combustion after being purified in the activated tail gas recovery combustion system so as to supply heat to the activation cylinder, otherwise, a large amount of carbon particles and dust particles are easily released in a leakage manner; in the extraction process, although the circulating hot water is obtained by heat exchange with the circulating cooling water, the heat loss is still large; (3) high-temperature flue gas generated by combustion of the purified tail gas in the annular combustion chamber also needs to be led out of the rotary activation furnace and exchanges heat with circulating hot water in a flue gas recovery heat exchange system, heat loss is large in the leading-out process, only saturated steam at about 120 ℃ can be obtained, the saturated steam needs to exchange heat with the activation cylinder again to obtain superheated steam which can participate in activation reaction, and the heat exchange consumes the heat of the activation cylinder.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a thermal cycle redox active carbon production system, which has the advantages of uniform heating in an activation channel, full activation reaction, low heat loss and low energy consumption.
In order to realize the purpose of the utility model, the technical scheme of the utility model is as follows:
a thermal cycle redox active carbon production system comprises an activation furnace, wherein the activation furnace comprises a furnace body, a central combustion chamber and a plurality of activation channels which are circumferentially distributed on the periphery of the central combustion chamber are arranged in the furnace body, the central combustion chamber and the activation channels both axially extend along the furnace body, and the discharge ends of the activation channels are communicated with the central combustion chamber;
the negative pressure suction device is used for sucking air and activated tail gas generated in the activation channel into the central combustion chamber to burn and release heat so as to supply heat to the activation channel and the steam supply device.
The utility model changes the position relation of the combustion chamber and the activation channels in the prior art, the central combustion chamber is arranged in the center of the furnace body, and the plurality of activation channels are distributed on the periphery of the central combustion chamber in a planetary way. On one hand, the inner diameter of each activation channel is reduced, the loading capacity of the carbonization material is not excessive, the uniform heating can be ensured, and the activation reaction is fully and quickly carried out; on the other hand, the inner diameter of the central combustion chamber is enlarged, the heat is sufficient, and heat can be supplied to each activation passage in the whole axial direction and the whole circumferential direction.
According to the utility model, the discharge end of the activation channel is communicated with the central combustion chamber, and meanwhile, the feed end of the furnace body is provided with the negative pressure suction device, so that negative pressure generated by starting the negative pressure suction device can suck air outside the furnace body and activated tail gas generated in the activation channel into the central combustion chamber, the activated tail gas and the air are combusted in the central combustion chamber to generate high-temperature flue gas, and under the suction of the negative pressure, the high-temperature flue gas flows from the discharge end of the furnace body to the feed end of the furnace body, so that heat is supplied to the activation channel on one hand, and the activation of carbonized materials in the activation channel is promoted; on the other hand, the steam supply device supplies heat to enable the steam supply device to generate a large amount of high-temperature steam to supply to the activation channel, so that the activation of the carbonized material is further promoted.
Under the negative pressure suction of the negative pressure suction device, the high-temperature flue gas cannot escape from the activation furnace, so that the step of leading the high-temperature flue gas out of the activation furnace, purifying and then leading the high-temperature flue gas back to the activation furnace is omitted, the heat exchange between the high-temperature flue gas and the activation channel can be directly carried out in situ in the activation furnace, the heat exchange between the high-temperature flue gas and the steam supply device can be carried out in the activation furnace or at the feed end of the activation furnace, the heat loss of the high-temperature flue gas is greatly reduced, the adaptive activation temperature in the activation channel is ensured to be always kept, and the energy consumption is greatly reduced.
In the thermal cycle redox active carbon production system, the peripheral wall of the furnace body is provided with a plurality of air inlets communicated with the central combustion chamber, and each air inlet is provided with a flow regulating valve.
Under the suction of the negative pressure suction device, air outside the activation furnace enters the central combustion chamber from each air inlet, and the flow regulating valve is convenient for regulating the opening size of the air inlet so as to control the air inlet amount in the central combustion chamber.
In the above thermal cycle redox active carbon production system, the steam supply device comprises a low temperature steam generator and a steam heater communicated with the low temperature steam generator through a low temperature steam input pipeline, the steam heater is communicated with the activation channel through a high temperature steam output pipeline, and the high temperature steam output pipeline and the activation channel are arranged in one-to-one correspondence;
at least the steam heater is arranged on the negative pressure passage formed by the negative pressure suction device.
The low-temperature steam generator is used for heating liquid water to generate low-temperature steam, and the low-temperature steam enters the steam heater from the low-temperature steam input pipeline; because the steam heater is arranged on the negative pressure passage formed by the negative pressure suction device, when the steam heater exchanges heat with high-temperature flue gas, low-temperature steam in the steam heater is heated, and the generated high-temperature steam enters the activation channel through the high-temperature steam output pipeline.
The high-temperature steam output pipelines extend along the axial direction of the activation channel, and each high-temperature steam output pipeline is provided with a plurality of steam distribution openings which are axially arranged along the high-temperature steam output pipelines; so as to uniformly feed the high-temperature steam to various positions of the activation passage.
The heat required by the low-temperature steam generator to generate low-temperature steam can be provided by high-temperature flue gas, and can also be an additionally arranged heating source. Under better condition, the medium temperature flue gas generated after the heat exchange of the high temperature flue gas and the steam heater is further subjected to the heat exchange with the low temperature steam generator, and the heat utilization rate of the system can be further improved.
Preferably, in the thermal cycle redox activated carbon production system, the negative pressure outlet of the central combustion chamber is hermetically provided with an isolation sleeve for preventing the central combustion chamber and the activation channel from being communicated at the feed end of the furnace body, and the steam heater is positioned in the isolation sleeve or in the central combustion chamber.
Set up steam heater in isolated sleeve, then isolated sleeve can play heat retaining effect, and will directly set up in the combustion chamber, then stop the calorific loss of high temperature flue gas basically, and low temperature steam input pipeline also can absorb partial heat. Preferably, in the above thermal cycle redox activated carbon production system, a steam heating chamber communicated with the steam heater is formed on a peripheral wall of the insulating sleeve, and the high temperature steam output pipe is communicated with the steam heating chamber.
The isolation sleeve can isolate the central combustion chamber and the activation channel on one hand, is also a necessary place for high-temperature flue gas on the other hand, and can absorb a large amount of heat. In order to fully utilize the heat, the utility model is provided with a steam heating chamber on the peripheral wall of the isolation sleeve, and high-temperature steam generated in the steam heater firstly enters the steam heating chamber and then enters the activation channel through a high-temperature steam output pipeline; when the low-temperature steam absorbs enough heat in the steam heater, the steam heating chamber can play a role in heat preservation, and the heat loss of the high-temperature steam in the pipeline is reduced; when the temperature of the high-temperature steam generated by the steam heater is insufficient, the heat can be further absorbed in the steam heating chamber.
Preferably, in the above thermal cycle redox activated carbon production system, the low temperature steam generator includes a second casing communicated with the isolation sleeve, and a second heat exchange tube is arranged in the second casing;
the tube pass inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve, and the tube pass outlet of the second heat exchange tube is communicated with the flue gas purification mechanism; the shell pass inlet of the second shell is communicated with the hot water input channel, and the shell pass outlet of the second shell is communicated with the low-temperature steam input pipeline.
Preferably, in the thermal cycle redox activated carbon production system, the steam supply device further comprises a condenser, wherein the superheated water input channel is communicated with the low-temperature steam generator, the condenser comprises a first shell communicated with a second shell, and a first heat exchange pipe is arranged in the first shell;
the shell pass inlet of the first shell is communicated with the water tank, and the shell pass outlet of the first shell is communicated with the shell pass inlet of the second shell through a hot water input channel;
the tube side inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve, the tube side outlet of the second heat exchange tube is communicated with the tube side inlet of the first heat exchange tube, and the tube side outlet of the first heat exchange tube is communicated with the flue gas purification mechanism.
Preferably, in the above thermal cycle redox activated carbon production system, the negative pressure suction device comprises a negative pressure fan, and the negative pressure fan is communicated with the tube pass outlet of the first heat exchange tube through a flue gas purification mechanism.
The medium-low temperature flue gas generated after heat exchange with the low-temperature steam generator can be directly discharged into the atmosphere after being purified by the flue gas purification mechanism; or continuously exchanging heat with the condensed water, supplying hot water to the low-temperature steam generator and then purifying by the flue gas purification mechanism.
The three-stage recovery of the high-temperature flue gas waste heat is realized through the steam heater, the low-temperature steam generator and the condenser, the heat recovery rate is high, and the heat loss is small.
In the thermal cycle oxidation-reduction activated carbon production system, the low-temperature steam input pipeline is provided with the three-way valve, one inlet of the three-way valve is connected with the low-temperature steam generator through the low-temperature steam input pipeline, the other inlet of the three-way valve is connected with the air input pipeline, and the outlet of the three-way valve is connected with the steam heater through the low-temperature steam input pipeline.
In the initial stage of the activation reaction, air can be fed into the activation channel through the air input pipeline (or the air is mixed with steam) to support combustion of the carbonized material to raise the temperature, so as to generate initial activated tail gas; the air input pipeline can be closed at the later stage of the activation reaction, so that the inside of the activation pipeline is kept in a relative anoxic state, the burning loss of the carbonized material is reduced, the yield of the product is improved, and at the moment, the main equation of the activation reaction can be expressed as follows: c + HO2+O2→CO2+H2+C→2CO+H2. As can be seen from the equation, the activation reaction is enhanced, and CO is converted2The activating agent is changed, so that the pore size distribution of the product is wider, the specific surface area is greatly increased, the product quality is greatly improved, and the application range of the product is wider; and steam is dischargedThe energy is converted, and the energy balance of the equipment system is ensured.
The heat required by the low-temperature steam generator to generate low-temperature steam can be provided by high-temperature flue gas, and can also be an additionally arranged heating source. Under better condition, the medium temperature flue gas generated after the heat exchange of the high temperature flue gas and the steam heater is further subjected to the heat exchange with the low temperature steam generator, and the heat utilization rate of the system can be further improved.
Preferably, in the above thermal cycle redox activated carbon production system, a steam heating chamber communicated with the steam heater is formed on a peripheral wall of the insulating sleeve, and the high temperature steam output pipe is communicated with the steam heating chamber.
The isolation sleeve can isolate the combustion chamber and the activation channel on one hand, and is a necessary place for high-temperature flue gas on the other hand, and can absorb a large amount of heat. In order to fully utilize the heat, the utility model is provided with a steam heating chamber on the peripheral wall of the isolation sleeve, and high-temperature steam generated in the steam heater firstly enters the steam heating chamber and then enters the activation channel through a high-temperature steam output pipeline; when the low-temperature steam absorbs enough heat in the steam heater, the steam heating chamber can play a role in heat preservation, and the heat loss of the high-temperature steam in the pipeline is reduced; when the temperature of the high-temperature steam generated by the steam heater is insufficient, the heat can be further absorbed in the steam heating chamber.
Preferably, in the above thermal cycle redox activated carbon production system, the low temperature steam generator includes a second casing communicated with the isolation sleeve, and a second heat exchange tube is arranged in the second casing;
the tube pass inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve, and the tube pass outlet of the second heat exchange tube is communicated with the flue gas purification mechanism; the shell pass inlet of the second shell is communicated with the hot water input channel, and the shell pass outlet of the second shell is communicated with the low-temperature steam input pipeline.
Preferably, in the above thermal cycle redox activated carbon production system, the steam supply device further comprises a condenser communicated with the low temperature steam generator through a hot water input channel, the condenser comprises a first shell communicated with a second shell, and a first heat exchange pipe is arranged in the first shell;
the shell pass inlet of the first shell is communicated with the water tank, and the shell pass outlet of the first shell is communicated with the shell pass inlet of the second shell through a hot water input channel;
the tube pass inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve, the tube pass outlet of the second heat exchange tube is communicated with the tube pass inlet of the first heat exchange tube, and the tube pass outlet of the first heat exchange tube is communicated with the smoke purification mechanism.
Preferably, in the above thermal cycle redox activated carbon production system, the negative pressure suction device comprises a negative pressure fan, and the negative pressure fan is communicated with the tube pass outlet of the first heat exchange tube through a flue gas purification mechanism.
The medium-low temperature flue gas generated after heat exchange with the low-temperature steam generator can be directly discharged into the atmosphere after being purified by the flue gas purification mechanism; or continuously exchanging heat with the condensed water, supplying hot water to the low-temperature steam generator and then purifying by the flue gas purification mechanism.
The three-stage recovery of the high-temperature flue gas waste heat is realized through the steam heater, the low-temperature steam generator and the condenser, the heat recovery rate is high, and the heat loss is small.
In the thermal cycle oxidation-reduction activated carbon production system, the low-temperature steam input pipeline is provided with the three-way valve, one inlet of the three-way valve is connected with the low-temperature steam generator through the low-temperature steam input pipeline, the other inlet of the three-way valve is connected with the air input pipeline, and the outlet of the three-way valve is connected with the steam heater through the low-temperature steam input pipeline.
In the initial stage of the activation reaction, air can be fed into the activation channel through an air input pipeline (or the air is mixed with steam) to support combustion of the carbonized material and raise the temperature, so as to generate initial activated tail gas; the air input pipeline can be closed at the later stage of the activation reaction, so that the interior of the activation pipeline is kept in a relatively anoxic state to reduce the burning loss of the carbonized material and improve the yield of the product, and at the moment, the main part of the activation reactionThe equation can be expressed as: c + HO2+O2→CO2+H2+C→2CO+H2. As can be seen from the equation, the activation reaction is enhanced, and CO is converted2The activating agent is changed, so that the pore size distribution of the product is wider, the specific surface area is greatly increased, the product quality is greatly improved, and the application range of the product is wider; and the water vapor is converted into energy, so that the energy balance of the equipment system is ensured.
In the thermal cycle redox active carbon production system, the activation furnace is arranged on the machine base in a rotary mode and is downwards inclined from the feeding end to the discharging end, and the feeding end of the activation furnace is provided with the self-feeding device.
According to the utility model, the activation furnace is arranged from the feeding end to the discharging end in a downward inclination manner, so that the self-feeding from the feeding device is facilitated on one hand, and the product in the activation channel is discharged from the discharging end on the other hand.
Preferably, in the above thermal cycle redox activated carbon production system, the self-charging device comprises:
the device comprises an upper charging barrel, a plurality of material blocking pieces, a plurality of material guiding channels and a plurality of material guiding channels, wherein the upper charging barrel is connected to an activation furnace in a sealing manner and synchronously rotates along with the activation furnace;
the bottom of the hopper is provided with a feeding pipe extending into the charging barrel, and an infrared sensor for monitoring the amount of carbonized materials in the hopper is arranged in the hopper;
a storage bin;
the spiral conveying mechanism is used for conveying the carbonized materials in the storage bin to the hopper;
and the controller is used for receiving the output signal of the infrared sensor and controlling the work of the spiral conveying mechanism according to the output signal.
Wherein, the feeding barrel is fixedly arranged at the feeding end of the activation furnace, so that the feeding barrel also has a certain inclination angle. When feeding, the carbonized material in the hopper falls into the charging barrel from the feeding pipe, and is caught by the material blocking sheet and temporarily kept in the material guiding channel; when no or little material is in the activation channel, the carbonized material in the material guide channel automatically slides into the activation channel, and when the material in the activation channel is enough, the carbonized material is stopped in the material guide channel to wait, so that the activation channel is ensured to be always kept in a material and uncongested state, the activation efficiency is ensured, and the condition of incomplete reaction caused by excessive carbonized material is avoided.
And because the material guide channel is open, along with the rotation of the charging barrel, the carbonized material which does not enter the activation channel can flow among different material guide channels, and the situation that the carbonized material is retained but no material or little material exists in the activation channel can not occur.
In the utility model, a spiral conveying mechanism is adopted to convey the carbonized material in the storage bin into a hopper; simultaneously, in order to avoid the hopper full storehouse, still installed infrared sensor in the hopper with whether have the material in the real-time detection hopper. When the infrared sensor detects that the amount of the carbonized materials in the hopper is less than a preset value, a signal is sent to the controller, and the controller starts the spiral conveying mechanism to convey the carbonized materials in the storage bin into the hopper; stopping the spiral conveying mechanism when the hopper is full; so the staff only need the interval time with the storage silo fill can, can realize full automatic feeding from loading attachment.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the central combustion chamber is arranged in the center of the furnace body, and the plurality of activation channels are distributed on the periphery of the central combustion chamber in a planetary manner; on one hand, the inner diameter of each activation channel is reduced, the loading capacity of the carbonization material is not excessive, the uniform heating can be ensured, and the activation reaction is performed fully and quickly; on the other hand, the inner diameter of the central combustion chamber is enlarged, the heat is sufficient, and heat can be supplied to each activation channel in the whole axial direction and the whole circumferential direction; when the production system of the utility model produces the activated carbon product with the same quality, the product yield is improved by more than 20 percent compared with the traditional activation equipment.
(2) According to the utility model, the discharge end of the activation channel is communicated with the central combustion chamber, and meanwhile, the feed end of the furnace body is provided with the negative pressure suction device, so that negative pressure generated by starting the negative pressure suction device can suck air outside the furnace body and activated tail gas generated in the activation channel into the central combustion chamber, the activated tail gas and the air are combusted in the central combustion chamber to generate high-temperature flue gas, and under the suction of the negative pressure, the high-temperature flue gas flows from the discharge end of the furnace body to the feed end of the furnace body, so that heat is supplied to the activation channel on one hand, and the activation of carbonized materials in the activation channel is promoted; on the other hand, the steam supply device supplies heat to enable the steam supply device to generate a large amount of high-temperature steam to supply to the activation channel, so that the activation of the carbonized materials is further promoted; under the negative pressure suction of the negative pressure suction device, the high-temperature flue gas cannot escape from the activation furnace, so that the step of leading the high-temperature flue gas out of the activation furnace, purifying and then leading the high-temperature flue gas back to the activation furnace is omitted, the heat exchange between the high-temperature flue gas and the activation channel can be directly carried out in situ in the activation furnace, the heat exchange between the high-temperature flue gas and the steam supply device can be carried out in the activation furnace or at the feed end of the activation furnace, the heat loss of the high-temperature flue gas is greatly reduced, the adaptive activation temperature in the activation channel is ensured to be always kept, and the energy consumption is greatly reduced.
(3) According to the utility model, the steam supply device realizes three-stage recovery of the high-temperature flue gas waste heat by using the steam heater, the low-temperature steam generator and the condenser, and has high heat recovery rate and small heat loss.
(4) In the utility model, a three-way valve is also arranged on the low-temperature steam input pipeline so as to convey a proper amount of air into the activation pipeline through the air input pipeline at the initial stage of activation to support combustion of the carbonized materials.
(5) According to the utility model, the activation furnace is arranged from the feeding end to the discharging end in a downward inclination manner, so that on one hand, the charging of the charging barrel is facilitated, and on the other hand, the products in the activation channel are discharged from the discharging end; wherein, the feeding barrel is fixedly arranged at the feeding end of the activation furnace, so that the feeding barrel also has a certain inclination angle. When feeding, the carbonized material in the hopper falls into the charging barrel from the feeding pipe, is caught by the material blocking sheet and is temporarily kept in the material guide channel; when no or little material is in the activation channel, the carbonized material in the material guide channel automatically slides into the activation channel, and when the material in the activation channel is enough, the carbonized material is stopped in the material guide channel to wait, so that the activation channel is ensured to be always kept in a material and uncongested state, the activation efficiency is ensured, and the condition of incomplete reaction caused by excessive carbonized material is avoided. And moreover, because the material guide channels are open, the carbonized materials which do not enter the activation channels can flow among different material guide channels along with the rotation of the charging barrel, and the condition that the carbonized materials are retained but no materials or few materials exist in the activation channels can not occur.
(6) In the utility model, a spiral conveying mechanism is adopted to convey the carbonized materials in the storage bin into a hopper; simultaneously, in order to avoid the hopper to be full of bins, still installed infrared sensor in the hopper with whether have the material in the real-time detection hopper. When the infrared sensor detects that the amount of the carbonized materials in the hopper is less than a preset value, a signal is sent to the controller, and the controller starts the spiral conveying mechanism to convey the carbonized materials in the storage bin into the hopper; stopping the spiral conveying mechanism when the hopper is full; therefore, the working personnel only need to fill the storage bin at intervals, and the automatic feeding can be realized through the feeding device.
Drawings
FIG. 1 is a schematic diagram of a thermal cycle redox activated carbon production system of the present invention;
FIG. 2 is a schematic diagram of a thermal cycle redox activated carbon production system of the present invention from another perspective;
FIG. 3 is a schematic diagram of the structure of the feed end of the activation furnace of FIG. 1;
FIG. 4 is a schematic cross-sectional view of the activation furnace of FIG. 1;
FIG. 5 is a cross-sectional view of the insulation sleeve of FIG. 3;
fig. 6 is a schematic structural view of the upper cartridge of fig. 1.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 and fig. 2, the thermal cycle redox activated carbon production system of the present embodiment includes a base 1 and an activation furnace 2 rotatably disposed on the base 1 through a rotation driving mechanism 9, wherein the activation furnace 2 is disposed in a downward inclination from a feeding end to a discharging end, so as to facilitate feeding and discharging; the two ends of the activation furnace 2 are respectively provided with a self-feeding device 3 and a discharging device 4 in a sealing way.
As shown in fig. 3 and 4, the activation furnace 2 of the present embodiment includes a furnace body 21, wherein a central combustion chamber 22 and a plurality of activation channels 23 are formed in the furnace body 21 and extend along the axial direction of the furnace body 21; the central combustion chamber 22 has a larger inner diameter and is located at the center of the furnace body 21, and the activation passages 23 have a smaller inner diameter and are uniformly distributed on the periphery of the central combustion chamber 22. In the arrangement mode, the activation of the carbonized materials is dispersed in each activation channel 23 and is not required to be crowded in the same activation channel 23, so that the carbonized materials are uniformly heated, the activation reaction is fully performed, and the quality of the activated carbon product is high; and, the central combustion chamber 22 having a large volume can sufficiently supply heat to each activation path 23.
In this embodiment, the central combustion chamber 22 supplies heat in the following manner: each activation channel 23 is arranged to be communicated with the central combustion chamber 22 at the discharge end, the negative pressure suction device 5 is arranged at the feed end of the furnace body 21, the peripheral wall of the furnace body 21 is provided with an air inlet 24 communicated with the central combustion chamber 22, and the negative pressure suction device 5 is adopted to suck the activated tail gas generated in each activation channel 23 and the air outside the furnace body 21 into the central combustion chamber 22 for combustion so as to release heat.
As shown in fig. 1 and 3, in order to ensure that the activation duct 23 communicates with the central combustion chamber 22 only at the discharge end thereof, each activation duct 23 is isolated from the central combustion chamber 22 in the furnace body 21; an isolation sleeve 25 which prevents the central combustion chamber 22 and the activation passage 23 from being communicated at the feed end of the furnace body 21 is also hermetically arranged at the feed end of the furnace body 21 and the negative pressure outlet of the central combustion chamber 22; the outer end of the isolation sleeve 25 extends to the outer side of the feeding device 3 and is in running fit with the frame 7; the underpressure outlet 25a of the insulating sleeve 25 opens out on the circumferential wall of the insulating sleeve 25, which, obviously, should also be located outside the charging device 3.
In the present embodiment, the negative pressure suction device 5 includes a negative pressure fan 51 and a sealed duct communicating the negative pressure fan 51 with the central combustion chamber 22 to form a negative pressure passage between the negative pressure fan 51 and the central combustion chamber 22.
After the activated tail gas and the high-temperature flue gas generated by the air in the central combustion chamber 22 supply heat to each activation passage 23, a large amount of heat is still carried; in order to make full use of this heat, the present embodiment provides the steam supply device 6 on the negative pressure path to generate high temperature steam using the heat of the high temperature flue gas.
As shown in fig. 1, the steam supply device 6 of the present embodiment includes a condenser 66 for generating hot water, which is introduced into the low temperature steam generator 61 from a hot water input pipe 67; a low temperature steam generator 61 for generating low temperature steam, which enters the steam heater 63 through a low temperature steam input pipe 62; and the steam heater 63 serves to heat the low-temperature steam into high-temperature steam.
As shown in fig. 1, the condenser 66 of the present embodiment includes a first casing and a first heat exchange tube disposed in the first casing, wherein a shell-side inlet of the first casing is connected to the water tank, and a shell-side outlet is communicated with the low temperature steam generator 61 through a hot water input pipe 67; the tube side inlet of the first heat exchange tube is communicated with the low-temperature steam generator 61, and the tube side outlet is communicated with the flue gas purification mechanism 8. The low-temperature steam generator 61 comprises a second shell and a second heat exchange tube arranged in the second shell, wherein a shell pass inlet of the second shell is communicated with a hot water input pipeline, and a shell pass outlet of the second shell is communicated with a low-temperature steam input pipeline 62; the tube pass inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve 25, and the tube pass outlet is communicated with the tube pass inlet of the condenser.
As shown in fig. 5 and seen in fig. 1 and 3, the steam heater 63 of the present embodiment is located in the isolation sleeve 25 (or may be directly disposed in the combustion chamber 22 or extend from the isolation sleeve 25 to the combustion chamber 22), and the steam outlet 62a of the low-temperature steam input pipe 62 extends to an end of the steam heater 63 away from the low-temperature steam generator 61 after penetrating into the steam heater 63; the low-temperature steam input pipeline 62 is fixed in the isolation sleeve 25 through a support rod 26; an annular steam heating chamber 25b is formed on the peripheral wall of the isolation sleeve 25, one end of the steam heater 63 close to the low-temperature steam generator 61 is communicated with the steam heating chamber 25b through a communicating pipe 25c, and the communicating pipe 25c also plays a role in fixing the steam heater 63 in the isolation sleeve 25; the number of the communicating pipes 25c may be set according to specific needs, and three communicating pipes are provided in this embodiment.
In this way, under the suction of the negative pressure fan 51, the high-temperature flue gas generated in the combustion chamber 22 first passes through the steam heater 63, and heats the steam heater 63 and the steam heating chamber 25 b; on one hand, the heat exchange is carried out with the low-temperature steam in the steam heater 63 to generate middle-temperature flue gas and high-temperature steam, and the high-temperature steam enters the steam heating chamber 25b through the communicating pipe 25c for heat preservation or further temperature rise; the medium temperature flue gas leaves the isolation sleeve 25 under the negative pressure suction and enters the low temperature steam generator 61, hot water is used for heat exchange in the low temperature steam generator 61, the generated low temperature steam enters the steam heater 63 from the low temperature steam input pipeline 62, and the medium temperature flue gas is converted into medium and low temperature flue gas; the medium-low temperature flue gas continues to enter the condenser 66, exchanges heat with cold water in the condenser 66, and the generated hot water enters the low-temperature steam generator 61 from the hot water input pipeline 67.
The three-stage heat exchange realizes the maximum utilization of the waste heat of the high-temperature flue gas, and the heat carried by the medium-low temperature flue gas after the heat exchange with the condenser is low, so that the flue gas can be directly discharged into the atmosphere after being purified and removed by the flue gas purification mechanism 8.
As shown in fig. 3 and 5, the periphery of the isolation sleeve 25 is hermetically connected with a plurality of high-temperature steam output pipelines 64 communicated with the steam heating chamber 25b, the number of the high-temperature steam output pipelines 64 is one-to-one corresponding to that of the activation channels 23, each high-temperature steam output pipeline 64 extends along the corresponding activation channel 23, and each high-temperature steam output pipeline 64 is provided with a plurality of steam distribution openings, and all the steam distribution openings are axially arranged along the high-temperature steam output pipelines 64; the high-temperature steam in the steam heating chamber 25b is delivered into each activation passage 23 one by one through each high-temperature steam output pipe 64, so that the carbonized material is activated.
As shown in fig. 5, the connection positions of the communicating tube 25c and the high-temperature steam output pipe 64 to the insulating sleeve 25 are preferably shifted from each other to extend the residence time of the high-temperature steam in the steam heating chamber 25b and ensure that the high-temperature steam sufficiently absorbs heat from the peripheral wall of the insulating sleeve 25.
As shown in fig. 1, a three-way valve 65 is further installed on the low temperature steam input pipe 62, one inlet of the three-way valve 65 is connected to the low temperature steam generator 61 through the low temperature steam input pipe 62, the other inlet of the three-way valve 65 is connected to an air input pipe (not shown), and the outlet of the three-way valve 65 is connected to the steam heater 63 through the low temperature steam input pipe 62.
In the initial stage of the activation reaction, air can be fed into the activation channel 23 through an air input pipeline or mixed with steam to support combustion of the carbonized material to raise the temperature and generate initial activated tail gas; in the later stage of the activation reaction, the air input pipeline can be closed or the air input quantity can be reduced, so that the activation pipeline 23 is kept in a relatively anoxic state, the burning loss of the carbonized material is reduced, and the yield of the product is improved. The activation reaction occurring in each activation lane 23 can be expressed by the following equation: c + HO2+O2→CO2+H2+C→2CO+H2。
As shown in fig. 6, and as shown in fig. 1 and 2, the self-feeding device 3 of the present embodiment includes an upper charging barrel 31 hermetically connected to the activation furnace 2 and synchronously rotating with the activation furnace 2, wherein two ends of the upper charging barrel 31 are open, one end of the upper charging barrel is directly hermetically connected to the activation furnace 2, and the other end of the upper charging barrel is hermetically sealed at the periphery of the isolation sleeve 25 by mixing packing and steel sheets; the inner peripheral wall of the upper charging barrel 31 is provided with a plurality of material blocking sheets 32, a material guiding channel 33 is formed between two adjacent material blocking sheets 32, and the material guiding channels 33 and the activation channels 23 are also arranged in a one-to-one correspondence manner.
The self-feeding device 3 further comprises a hopper 34 fixedly mounted on the frame 7, the bottom of the hopper 34 being provided with a feeding pipe 35 extending into the upper charging barrel 31.
During feeding, the carbonized material in the hopper 34 falls into the upper charging barrel 31 from the feeding pipe 35, and is caught by the material blocking sheet 32 and stays in the material guiding channel 33; because the charging barrel 31 and the activation furnace 2 are both arranged from the charging end to the discharging end in a downward inclination manner, when no material or little material exists in the activation channel 23, the carbonized material in the material guide channel 33 automatically slides into the activation channel 23, and when the material in the activation channel 23 is enough, the carbonized material is stopped in the material guide channel 33 to wait, so that the activation channel 23 is ensured to be kept in a material and uncongested state all the time, the activation efficiency is ensured, and the condition of incomplete reaction caused by excessive carbonized material is avoided. Moreover, because the material guiding channels 33 are open, the carbonized materials which do not enter the activation channel 23 can flow between different material guiding channels 33 along with the rotation of the charging barrel 31, and the situation that the carbonized materials are retained but no or little materials exist in the activation channel 23 can not occur.
In order to further improve the material guiding effect of the material guiding channel 33 and promote the carbonized materials to rapidly enter the corresponding activation channel 23, the material guiding channel 33 is axially arranged obliquely relative to the upper charging barrel 31, and the oblique direction of the material guiding channel 33 is opposite to the rotating direction of the upper charging barrel 31 at one end of the upper charging barrel 31 close to the activation furnace 2.
As shown in FIG. 2, in this embodiment, a screw conveyor 36 is used to feed the carbonized material in a storage bin 37 into a hopper 34. Meanwhile, in order to prevent the hopper 34 from being full, an infrared sensor is installed in the hopper 34 to detect whether there is material in the hopper 34 in real time. When the infrared sensor detects that the amount of the carbonized materials in the hopper 34 is less than a preset value, a signal is sent to the controller, and the controller starts the spiral conveying mechanism 36 to convey the carbonized materials in the storage bin 37 into the hopper 34; stopping the screw conveying mechanism 36 when the hopper 34 is full; therefore, the working personnel only need to fill the storage bin 37 at intervals, and the full-automatic feeding can be realized from the feeding device 3.
The working principle of the thermal cycle redox active carbon production system of the embodiment is as follows:
an infrared sensor in the hopper 34 detects the amount of the carbonized material in the hopper in real time, when the detected amount of the carbonized material is smaller than a preset value, a signal is sent to a controller, the controller starts a spiral conveying mechanism 36, the spiral conveying mechanism 36 conveys the carbonized material in a storage bin 37 into the hopper 34 at a preset speed, and conveying is stopped when the hopper 34 is full; the carbonized material in the hopper 34 falls into the feeding barrel 31 through the feeding pipe 35 at a certain speed and falls into the material guiding channel 33;
starting the rotary driving mechanism 9 to enable the activation furnace 2 to rotate, enabling the charging barrel 31 and the activation furnace 2 to rotate synchronously, and enabling the carbonized materials in the material guide channel 33 to automatically enter the corresponding activation channel 23 in the rotating process until the activation channel 23 is full of the carbonized materials; with the proceeding of the activation reaction in the activation channel 23, the obtained activated carbon is continuously discharged, and then the material guide channel 33 continuously feeds materials to the corresponding activation channel 23;
when the activation is started, firstly opening the furnace tail cover 27 at the discharge end of the activation furnace 2, igniting the carbonized materials in each activation channel 23 by using fuel gas, and conveying a small amount of air into each activation channel 23 from the air conveying pipeline through the high-temperature steam output pipeline 64 to ensure that the carbonized materials in each activation channel 23 are firstly combusted to generate activated tail gas;
then the furnace tail cover 27 is closed in a sealing way, the negative pressure fan 51 is started, and the activated tail gas and air are sucked into the central combustion chamber 22, so that the activated tail gas is fully combusted, and high-temperature flue gas is generated; on one hand, the high-temperature flue gas further supplies heat to each activation channel 23, on the other hand, the high-temperature flue gas firstly penetrates through the isolation sleeve 25 under the negative pressure suction to heat the steam heater 63 and the isolation sleeve 25, low-temperature steam in the steam heater 63 is heated and then converted into high-temperature steam, the high-temperature steam enters the steam heating chamber 25b through the communicating pipe 25c to be subjected to heat preservation or further temperature rise, and finally enters the corresponding activation channel 23 through the high-temperature steam output pipeline 64 to react with a carbonized material; after high-temperature steam enters the activation channel 23, the air conveying capacity of the air conveying pipeline can be reduced, and the activation channel 23 is ensured to be in a relatively anoxic state;
after heat exchange with low-temperature steam, high-temperature flue gas is converted into medium-temperature flue gas, the medium-temperature flue gas passes through the low-temperature steam generator 61 under the suction of negative pressure, hot water in the low-temperature steam generator 61 is heated to generate low-temperature steam, the low-temperature steam enters the steam heater 63 through the low-temperature steam input pipeline 62, and the medium-temperature flue gas is converted into medium-temperature and low-temperature flue gas; the medium-low temperature flue gas continuously enters the condenser 66, exchanges heat with cold water in the condenser 66, and the generated hot water enters the low-temperature steam generator 61 from the hot water input pipeline 67;
after heat exchange with cold water, the medium-low temperature flue gas is converted into normal temperature flue gas, and is directly discharged into the atmosphere after being purified by the flue gas purification mechanism 8 to remove carbon particles, dust particles and the like.
Claims (10)
1. A thermal cycle redox active carbon production system comprises an activation furnace (2), and is characterized in that the activation furnace (2) comprises a furnace body (21), a central combustion chamber (22) and a plurality of activation channels (23) which are circumferentially distributed on the periphery of the central combustion chamber (22) are arranged in the furnace body (21), the central combustion chamber (22) and the activation channels (23) both axially extend along the furnace body (21), and the discharge ends of the activation channels (23) are communicated with the central combustion chamber (22);
the negative pressure suction device (5) is arranged at the feed end of the furnace body (21) and communicated with the central combustion chamber (22) and the steam supply device (6) is used for conveying water steam to the activation channel (23), and the negative pressure suction device (5) is used for sucking air and activated tail gas generated in the activation channel (23) into the central combustion chamber (22) to burn and release heat so as to supply heat to the activation channel (23) and the steam supply device (6).
2. The thermal cycle redox activated carbon production system of claim 1, wherein the outer peripheral wall of the furnace body (21) is provided with a plurality of air inlets (24) communicated with the central combustion chamber (22), and each air inlet (24) is provided with a flow regulating valve.
3. The thermal cycle redox activated carbon production system of claim 1, wherein the steam supply device (6) comprises a low temperature steam generator (61) and a steam heater (63) communicated with the low temperature steam generator (61) through a low temperature steam input pipe (62), the steam heater (63) is communicated with the activation channel (23) through a high temperature steam output pipe (64), and the high temperature steam output pipes (64) are arranged in one-to-one correspondence with the activation channels (23);
at least the steam heater (63) is arranged on the negative pressure passage formed by the negative pressure suction device (5).
4. A thermal cycle redox activated carbon production system as claimed in claim 3 wherein the negative pressure outlet of the central combustion chamber (22) is sealingly provided with an insulating sleeve (25) which prevents the central combustion chamber (22) and the activation duct (23) from communicating at the feed end of the furnace body (21), and the steam heater (63) is located within the insulating sleeve (25) or within the central combustion chamber (22).
5. The thermal cycle redox activated carbon production system of claim 4, wherein the insulation sleeve (25) is formed at a peripheral wall thereof with a steam heating chamber (25b) communicating with the steam heater (63), and the high temperature steam output pipe (64) communicates with the steam heating chamber (25 b).
6. The thermal cycle redox activated carbon production system of claim 4, wherein the low temperature steam generator (61) comprises a second housing in communication with the insulating sleeve (25), the second housing (51) having a second heat exchange tube therein;
the tube pass inlet of the second heat exchange tube is communicated with the negative pressure outlet of the isolation sleeve (25), and the tube pass outlet of the second heat exchange tube is communicated with the flue gas purification mechanism (8); the shell-side inlet of the second shell is communicated with a hot water input channel (67), and the shell-side outlet of the second shell is communicated with the low-temperature steam input pipeline (62).
7. The thermal cycle redox activated carbon production system of claim 6, wherein the steam supply means (6) further comprises a condenser (66) in communication with the low temperature steam generator (61) through a hot water input channel (67), the condenser (66) comprising a first housing in communication with a second housing, the first housing having a first heat exchange tube therein;
the shell side inlet of the first shell is communicated with the water tank, and the shell side outlet of the first shell is communicated with the shell side inlet of the second shell through a hot water input channel (67);
the tube side outlet of the second heat exchange tube is communicated with the tube side inlet of the first heat exchange tube, and the tube side outlet of the first heat exchange tube is communicated with the flue gas purification mechanism (8).
8. The thermal cycle redox activated carbon production system as set forth in claim 4, wherein a three-way valve (65) is installed on the low-temperature steam input pipe (62), one inlet of the three-way valve (65) is connected to the low-temperature steam generator (61) through the low-temperature steam input pipe (62), the other inlet of the three-way valve (65) is connected to the air input pipe, and an outlet of the three-way valve (65) is connected to the steam heater (63) through the low-temperature steam input pipe (62).
9. The thermal cycle redox activated carbon production system of any one of claims 1-8, characterized in that the activation furnace (2) is rotatably arranged on the stand (1) and is arranged from a feeding end to a discharging end in a downward inclination manner, and the feeding end of the activation furnace (2) is provided with a self-feeding device (3).
10. The thermal cycle redox activated carbon production system of claim 9, wherein the self-feeding device (3) comprises:
the device comprises an upper charging barrel (31), wherein the upper charging barrel (31) is connected to an activation furnace (2) in a sealing manner and synchronously rotates along with the activation furnace (2), a plurality of material blocking pieces (32) are arranged on the inner peripheral wall of the upper charging barrel (31), a material guide channel (33) is formed between every two adjacent material blocking pieces (32), and the material guide channels (33) and the activation channels (23) are arranged in a one-to-one correspondence manner;
the device comprises a hopper (34), wherein a feeding pipe (35) extending into an upper charging barrel (31) is arranged at the bottom of the hopper (34), and an infrared sensor for monitoring the amount of carbonized materials in the hopper (34) is arranged in the hopper (34);
a storage bin (37);
the spiral conveying mechanism (36), the spiral conveying mechanism (36) is used for conveying the carbonized materials in the storage bin (37) to the hopper (34);
and the controller is used for receiving the output signal of the infrared sensor and controlling the work of the spiral conveying mechanism (36) according to the output signal.
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| CN114408926A (en) * | 2022-01-28 | 2022-04-29 | 安徽久泰新材料科技有限公司 | Thermal cycle redox active carbon production system |
| CN114408926B (en) * | 2022-01-28 | 2023-11-21 | 安徽久泰新材料科技有限公司 | Thermal cycle redox active carbon production system |
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