CN212246737U - Circulation backheating type sludge treatment system - Google Patents
Circulation backheating type sludge treatment system Download PDFInfo
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- CN212246737U CN212246737U CN201922386755.0U CN201922386755U CN212246737U CN 212246737 U CN212246737 U CN 212246737U CN 201922386755 U CN201922386755 U CN 201922386755U CN 212246737 U CN212246737 U CN 212246737U
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Abstract
The utility model provides a circulation regenerative sludge treatment system, which comprises a sludge treatment subsystem, a wet flue gas treatment subsystem and a circulation regenerative subsystem; the sludge treatment subsystem comprises a rotary drying kiln, a burner and a mixed combustion chamber, wherein air flowing in from a gas inlet of the mixed combustion chamber is mixed with flame generated by the burner and then flows into the rotary drying kiln; the wet flue gas treatment subsystem comprises a dust remover, a cooling tower and a secondary combustion chamber which are connected in sequence; the circulation heat recovery subsystem comprises a heat exchanger, a flue gas return pipe and a flue gas discharge pipe, wherein one end of the flue gas return pipe is connected with a flue gas outlet of the cooling tower, the flue gas return pipe is connected with the mixed combustion chamber after passing through the heat exchanger, one end of the flue gas discharge pipe is connected with a flue gas outlet of the secondary combustion chamber, and the flue gas discharge pipe is connected with a tail gas treatment device after passing through the heat exchanger. The utility model discloses on the basis of adopting the rotary drying kiln, the high-temperature gas of second combustion chamber is recycled, has the advantage that the energy consumption is low, the flue gas treatment facility load is little.
Description
Technical Field
The utility model relates to a sludge treatment technical field, concretely relates to circulation backheating formula sludge treatment system.
Background
With the rapid development of economy, the production amount of solid waste sludge in China is increased rapidly, and effective treatment and disposal of the sludge are very important. At present, the sludge treatment mainly comprises two modes of landfill treatment and incineration treatment. Because the landfill treatment process is influenced by various environmental factors, the conditions are strict, the treatment is not good, and secondary pollution to underground water, soil and the like is easy to cause; the sludge incineration treatment has the obvious advantages of reduction, stabilization and harmlessness, and is a widely used mode at present.
At present, the rotary kiln is used for drying sludge, most of the rotary kiln adopts direct combustion for heat supply, flame of a burner is directly combusted in the kiln, and the heat of the flame is utilized for directly drying the sludge. The rotary drying kiln is a heating device, fuel and primary air for combustion supporting are fed into a combustion chamber through a kiln head burner to form high-temperature flame, a large amount of heat is emitted, the generated high-temperature smoke is used as a heat source for drying materials, and the discharged waste gas is discharged into the atmosphere after dust collection and purification.
In the process of drying sludge by adopting a rotary kiln, a large amount of wet flue gas can be generated and discharged after being purified, the current flue gas treatment mode mainly adopts a dedusting and desulfurization and denitrification treatment process or a secondary combustion chamber incineration and desulfurization and denitrification treatment process, and although the effective treatment of the wet flue gas can be carried out, the following defects still exist: 1) the discharge amount of the flue gas is large, wet flue gas directly enters the secondary combustion chamber for incineration, and the discharged flue gas amount is large; 2) the power consumption of the flue gas treatment device is large, the flue gas contains certain impurities (such as dust), and the damage to subsequent equipment is high; 3) the temperature of the wet flue gas is higher, the wet flue gas contains more moisture, the load of subsequent equipment, especially a secondary combustion chamber is larger, the energy consumption is high, and the incineration efficiency is low.
For example, chinese patent application 201310061327.5 discloses a sludge treatment device and process flow of integrated condensation dehydration and waste heat utilization, which includes a magnetization pyrolysis machine, a dehumidification tower, a heat exchanger, a secondary combustion chamber and a tail gas treatment device, which are connected in sequence, wherein a water-smoke mixed gas outlet of the magnetization pyrolysis machine is connected with a smoke inlet of the dehumidification tower, a smoke outlet of the dehumidification tower is connected with a smoke inlet of the heat exchanger, a smoke outlet of the heat exchanger is communicated with the magnetization pyrolysis machine through a flue, and is communicated with a smoke inlet of the secondary combustion chamber through another flue, and a smoke outlet of the secondary combustion chamber is connected with the tail gas treatment device after passing through a heat exchanger and then being subjected to thermal circulation. The sludge is treated by adopting a magnetization pyrolysis machine in the prior art.
SUMMERY OF THE UTILITY MODEL
To prior art's defect, the utility model provides a circulation backheat formula sludge treatment system, on the basis that adopts gyration drying kiln, the high-temperature gas of two combustion chambers of circulation recycle has the energy consumption and hangs down, the little advantage of flue gas treatment facility load.
In order to achieve the purpose, the utility model provides a circulation backheating type sludge treatment system, which comprises a sludge treatment subsystem, a wet flue gas treatment subsystem and a circulation backheating subsystem; the sludge treatment subsystem comprises a rotary drying kiln, a combustor and a mixed combustion chamber positioned between the rotary drying kiln and the combustor, wherein the mixed combustion chamber can receive flame generated by the combustor, the mixed combustion chamber is provided with a gas inlet, and air flowing in from the gas inlet and the flame generated by the combustor are mixed and combusted and then flow into the rotary drying kiln; the wet flue gas treatment subsystem comprises a dust remover, a cooling tower and a secondary combustion chamber, wherein a flue gas inlet of the dust remover is connected with a flue gas outlet of the rotary drying kiln, a flue gas outlet of the dust remover is connected with a flue gas inlet of the cooling tower, and a flue gas outlet of the cooling tower is connected with a flue gas inlet of the secondary combustion chamber through a first branch pipe; the circulating heat recovery subsystem comprises a heat exchanger, a flue gas return pipe and a flue gas discharge pipe, wherein one end of the flue gas return pipe is connected with a flue gas outlet of the cooling tower, the flue gas return pipe is connected with the mixed combustion chamber (or a burner) after passing through the heat exchanger, one end of the flue gas discharge pipe is connected with a flue gas outlet of the secondary combustion chamber, and the flue gas discharge pipe is connected with a tail gas treatment device after passing through the heat exchanger.
The above technical scheme of the utility model, among the sludge treatment (burn or mummification) subsystem, add and mix the combustion chamber, mix the combustion chamber and can be close to the produced flame of complete receipt combustor, avoided flame directly to fire mud and harm the phenomenon of mud organic matter, outside air passes through in the gas inlet gets into and mixes the combustion chamber, mix with the flame in the combustion chamber and burn, form the heating gas of high temperature, can avoid combustor high temperature flame directly to fire mud, organic matter in the harm mud, then heating gas lets in the gyration drying kiln, with drying to the mud in the gyration drying kiln, in order to accomplish the minimizing and innocent treatment process of mud.
Preferably, the temperature of the heated gas formed in the chamber is not less than 300 ℃, but it is not used at an ultra-high temperature (preferably not more than 1300 ℃), for example, 500 ℃.
Further, the flue gas discharged from the rotary drying kiln is firstly filtered by a dust remover, and the flue gas after dust removal enters a cooling tower (preferably a spray cooling tower) for washing; wherein, one of the purposes of washing is to cool the wet flue gas and reduce the water content of the wet flue gas. Because the flue gas discharged from the rotary drying kiln has higher temperature and higher water content, the temperature of the flue gas is reduced by spraying and washing the flue gas, so that the moisture content of the wet flue gas is saturated, water is condensed into liquid, gas-liquid separation is achieved, and the moisture content of the flue gas is reduced, so that the subsequent treatment of the wet flue gas is facilitated; the second purpose of the washing is to further remove the dust of the wet flue gas by spraying.
And then controlling the saturated wet flue gas to flow into a secondary combustion chamber for full incineration, wherein the secondary combustion chamber is provided with a burner for heating, the combustion temperature is 300-1300 ℃, for example 1000 ℃, so that the saturated wet flue gas is fully incinerated and decomposed, and harmful substances contained in the saturated wet flue gas are removed, thereby facilitating subsequent continuous treatment.
Specifically, the circulating heat recovery subsystem is used for recovering and obtaining the heat of the smoke discharged from the secondary combustion chamber, and the heat exchange between the smoke return pipe and the smoke discharge pipe is carried out through the heat exchanger, so that on one hand, the smoke in the smoke return pipe obtains more heat to be heated to form high-temperature smoke, and the high-temperature smoke is directly recovered to the rotary drying kiln for utilization; on the other hand, the temperature of the flue gas in the flue gas discharge pipe is reduced to form low-temperature flue gas, so that the flue gas is conveniently discharged and the subsequent device is conveniently retreated.
The flue gas in the flue gas return pipe comes from the cooling tower, does not need to pass through a secondary combustion chamber, and directly returns to the rotary drying kiln for use, and the flue gas does not need to be treated, so that the process is simple; meanwhile, the characteristic of lower temperature is suitable for heat exchange with the other part of flue gas which is fully combusted and treated through the secondary combustion chamber, so that the temperature of the other part of flue gas is reduced, the other part of flue gas is conveniently discharged, a cooling device is not required to be arranged for treating the other part of flue gas, the occupied area of the whole system is reduced, and the process operability is stronger.
According to another embodiment of the present invention, the rotary kiln is arranged in a horizontal inclined manner.
Specifically, the low-level one end of gyration drying kiln is provided with the mud export, and the high-level one end of gyration drying kiln is equipped with the mud entry, and is corresponding, and the exhanst gas outlet of gyration drying kiln also sets up on its tip that is in the high-level.
According to the utility model discloses a another kind of embodiment further includes and sprays water circulation subsystem, and it includes the cistern, the cooling tower and the circulating pipe that link to each other with the cistern, and circulating pipe includes first water pipe, second water pipe, and the one end of first water pipe is connected to the bottom basin district section of cooling tower, and the other end of first water pipe is connected to the cooling tower, and the cistern is connected to the one end of second water pipe, and the shower head of cooling tower is connected to the other end of second water pipe.
According to the utility model discloses a another kind of embodiment is equipped with the induced air fan on the connecting pipeline between dust remover and cooling tower, is equipped with the induced air fan on the connecting pipeline between cooling tower and second combustion chamber.
According to the utility model discloses a another kind of embodiment, tail gas processing apparatus is including sack cleaner, desulfurizing tower and the flue that successively sets up.
According to another embodiment of the present invention, the temperature of the heated gas formed in the mixed combustion chamber is not lower than 300 ℃.
According to another embodiment of the present invention, the flue gas temperature in the flue gas recirculation pipe is not lower than 50 ℃.
The utility model discloses possess following beneficial effect:
the utility model discloses a circulation backheating formula sludge treatment system has set up peculiar chamber of mixing combustion, and the produced ultra-high temperature flame of combustor is fully mixed combustion with the air in mixing combustion chamber, forms the heating gas of high temperature and uses in getting into rotary drying kiln, has avoided the phenomenon that high temperature flame directly fired mud.
In addition, the temperature of the heating gas is not lower than 400 ℃, for example, 500 ℃, on one hand, enough heat can be formed to dry the sludge, on the other hand, the phenomenon of burning the sludge can be effectively avoided, organic matters in the sludge cannot be damaged, and the emission of waste gas is reduced.
In addition, through the combined treatment of the cooling tower, the secondary combustion chamber and the tail gas treatment device, on one hand, the emission of flue gas is reduced, on the other hand, the load of the secondary combustion chamber and the tail gas treatment device can be reduced, and the device has the advantages of small emission of flue gas, low energy consumption and low investment and operation cost;
in addition, the heat exchanger is arranged to exchange heat between the flue gas return pipe and the flue gas discharge pipe, heat generated by the secondary combustion chamber is recycled, and flue gas with higher temperature after heat exchange is circulated into the mixed combustion chamber for use, so that on one hand, the energy consumption required by the rotary drying furnace is reduced, on the other hand, the temperature of discharged flue gas is reduced, and the subsequent external discharge treatment process is facilitated.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow diagram of a recycling regenerative sludge treatment system according to the present invention;
FIG. 2 is a schematic view of the sludge treatment subsystem of the present invention;
fig. 3 is a schematic view of the tail gas treatment device of the present invention.
Detailed Description
A recycling heat-return type sludge treatment system is shown in figures 1-3 and comprises a sludge treatment subsystem 10, a wet flue gas treatment subsystem 20, a spraying water recycling subsystem 30, a recycling heat-return subsystem 40 and a tail gas treatment device 50.
The sludge treatment subsystem 10 includes a rotary kiln 11, a burner 12 and a mixed combustion chamber 13, referring to fig. 2, the mixed combustion chamber 13 is located between the rotary kiln 11 and the burner 12 and is capable of receiving the flame generated by the burner 12, the mixed combustion chamber 13 is provided with a gas inlet 131, and the air flowing in from the gas inlet 131 and the flame generated by the burner 12 are mixed and combusted and then flow into the rotary kiln 11.
The mixed combustion chamber 13 can nearly completely or completely receive the flame generated by the burner 12, and forms high-temperature heating airflow after mixed combustion with air so as to flow into the rotary drying kiln 11 for drying sludge; the temperature of the heating air flow forming high temperature in the mixing combustion chamber 13 is preferably between 400 ℃ and 700 ℃, for example 500 ℃, on one hand, enough heat can be formed to dry the sludge, and on the other hand, the phenomenon that the sludge is fired at ultra-high temperature can be effectively avoided.
Further, the rotary drying kiln 11 is arranged in a horizontal inclined manner, a sludge outlet 111 and a high-temperature heating airflow inlet 112 are arranged at one end part 11a of the rotary drying kiln 11 at a low position, the high-temperature heating airflow inlet 112 is communicated with the mixed combustion chamber 13, and the sludge outlet 111 is used for discharging dried sludge; a sludge inlet 113 is provided at the end 11b of the rotary kiln 11 at the high position for supplying sludge, and correspondingly, a flue gas outlet 114 of the rotary kiln 11 is also provided at the end 11b at the high position.
At this time, the flue gas discharged from the flue gas outlet 114 of the rotary kiln 11 can be directly circulated to the co-combustion chamber 13 for use, and is not used as a preferred mode because it carries more water vapor, is not favorable for sludge drying, and has low sludge incineration efficiency.
The wet flue gas treatment subsystem 20 comprises a dust remover 21, a cooling tower 22 and a secondary combustion chamber 23, wherein a flue gas inlet 211 of the dust remover 21 is connected with a flue gas outlet 114 of the rotary drying kiln 11, a flue gas outlet 212 of the dust remover 21 is connected with a flue gas inlet 221 of the cooling tower 22, and a flue gas outlet 222 of the cooling tower 22 is connected with a flue gas inlet 231 of the secondary combustion chamber 23 through a first branch pipe 24.
The flue gas discharged from the rotary drying kiln 11 is firstly filtered by a dust remover 21, and the dedusted flue gas enters a cooling tower 22 for washing to obtain saturated wet flue gas with lower temperature and lower water content, and dust of the wet flue gas is further removed, so that the subsequent reprocessing process is facilitated.
Preferably, the temperature of the saturated wet flue gas discharged from the temperature reduction tower 22 is controlled to be 30 ℃ to 80 ℃, for example, 50 ℃, and in this case, the saturated wet flue gas contains relatively less moisture, which is beneficial to reducing the combustion load of the second combustion chamber 23 and effectively reducing the discharge amount of the flue gas.
Furthermore, the saturated wet flue gas is controlled to flow into the secondary combustion chamber 23 for full combustion, the secondary combustion chamber 23 is provided with a burner for heating, the combustion temperature is 300-1300 ℃, for example 1000 ℃, so that the saturated wet flue gas is fully burnt and decomposed, and harmful substances contained in the saturated wet flue gas are removed, thereby facilitating subsequent treatment.
The spray water circulation subsystem 30 is used for recycling the cooling water in the cooling tower 22 to save the spray water, and referring to fig. 1, it includes a water reservoir 31, a cooling tower 32 connected to the water reservoir 31, and a water circulation pipe 33, the water circulation pipe 33 includes a first water pipe 331 and a second water pipe 332, one end of the first water pipe 331 is connected to the bottom tank section 223 of the cooling tower 22, the other end of the first water pipe 331 is connected to the cooling tower 32, one end of the second water pipe 332 is connected to the water reservoir 31, and the other end of the second water pipe 332 is connected to the spray head 224 of the cooling tower 22.
The circulating heat recovery subsystem 40 is used for recovering and obtaining heat of the flue gas discharged from the secondary combustion chamber 23, and comprises a heat exchanger 41, a flue gas return pipe 42 and a flue gas discharge pipe 43, wherein one end of the flue gas return pipe 42 is connected with a flue gas outlet 222 of the cooling tower 22, and is connected with the mixed combustion chamber 13 after passing through the heat exchanger 41, and one end of the flue gas discharge pipe 43 is connected with a flue gas outlet 232 of the secondary combustion chamber 23, and is connected with the tail gas treatment device 50 after passing through the heat exchanger 41.
On one hand, the flue gas in the flue gas return pipe 42 obtains more heat to be heated to form high-temperature flue gas, and the high-temperature flue gas is directly recycled to the rotary drying kiln 11 for utilization; on the other hand, the temperature of the flue gas in the flue gas discharge pipe 43 is reduced to form low-temperature flue gas, so that the flue gas can be discharged and the subsequent device can be treated conveniently.
Referring to fig. 1 again, the flue gas in the flue gas return pipe 42 comes from the cooling tower 22, does not need to pass through the secondary combustion chamber 23, and directly returns to the rotary drying kiln 11 for use, and the part of the flue gas does not need to be treated, so that the process is simple; meanwhile, the characteristic of lower temperature is suitable for heat exchange with the other part of flue gas which is fully combusted through the secondary combustion chamber 23, so that the temperature of the other part of flue gas is reduced, the other part of flue gas is convenient to discharge, a cooling device is not required to be arranged for treating the other part of flue gas, the occupied area of the whole system is reduced, and the process operability is stronger.
The tail gas treatment device 50 includes a bag-type dust collector 51, a desulfurizing tower 52 and a clean flue 53, which are sequentially arranged, referring to fig. 3, for performing desulfurization treatment, and specifically, an induced air fan 54 is arranged on a connecting pipeline between the bag-type dust collector 51 and the desulfurizing tower 52, for realizing stable flow of flue gas.
Correspondingly, in this embodiment, an induced draft fan 25 is disposed on the connection pipeline between the dust remover 21 and the cooling tower 22, and an induced draft fan 26 is disposed on the connection pipeline between the cooling tower 22 and the second combustion chamber 23, so as to realize stable flow of flue gas in the whole system.
The utility model provides an on each connecting pipeline, can also be provided with its valve that flows of control, for example electronic opening valve to carry out the regulation of flow.
The utility model discloses a gyration drying kiln 11 carries out the incineration disposal of mud, the moisture content of control discharge mud is below 50%, the wet flue gas that its produced gets into dust remover 21, the wet flue gas gets into cooling tower 22 and washes after the dust removal processing, a part of wet flue gas after the washing (the temperature of controlling this saturated wet flue gas is 30 ℃ -100 ℃, for example 50 ℃) gets into second combustion chamber 23 and carries out the combustion processing and obtains the high temperature flue gas (the combustion temperature of second combustion chamber 23 is 300 ℃ -1300 ℃), high temperature gas discharges through flue gas discharge pipe 43, another part of wet flue gas flows into gyration drying kiln 11 through flue gas backflow pipe 42 and recycles; wherein, a heat exchanger 41 is arranged between the flue gas return pipe 42 and the flue gas discharge pipe 43 for increasing the temperature of the flue gas in the flue gas return pipe 42.
Wherein, the water content of the filled sludge of the rotary drying kiln 11 is generally between 50 percent and 85 percent.
Further, a part of the flue gas washed by the cooling tower 22 is subjected to combustion treatment by the second combustion chamber 23 to be subjected to subsequent discharge treatment (specifically, for example, a tail gas treatment device 50 in fig. 1 is provided), and another part of the flue gas is returned and supplemented to the rotary drying kiln 11 through the flue gas return pipe 42 to be reused, wherein the heat exchanger 41 is provided between the flue gas return pipe 42 and the flue gas discharge pipe 43, on one hand, the flue gas in the flue gas return pipe 42 is heated to form flue gas for high-temperature heating, and on the other hand, the flue gas in the flue gas discharge pipe 43 is cooled to form low-temperature flue gas to be subjected to subsequent discharge treatment.
Specifically, the temperature of the flue gas flowing into the rotary kiln 11 is controlled to be not lower than 80 ℃, preferably, the temperature of the flue gas is directly the same as the temperature of the heating flue gas for heating the rotary kiln 11, so as to reduce the energy consumption, for example, the temperature of the heating flue gas in the rotary kiln 11 is 300 ℃, the temperature of the flue gas flowing back into the rotary kiln 11 is 300 ℃, so as to save the energy consumption of the burner 12 adopted by the rotary kiln 11, at this time, the burner 12 shown in fig. 1 can be used only in the system starting stage, or can be used for auxiliary heating, and is not used as a main heat source.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications without departing from the scope of the invention, i.e. all equivalent modifications made according to the invention are intended to be covered by the scope of the invention.
Claims (6)
1. A circulation backheating type sludge treatment system is characterized by comprising:
a sludge treatment subsystem;
a wet flue gas treatment subsystem; and
a circulating heat return subsystem;
the sludge treatment subsystem comprises a rotary drying kiln, a combustor and a mixed combustion chamber positioned between the rotary drying kiln and the combustor, wherein the mixed combustion chamber can receive flame generated by the combustor, the mixed combustion chamber is provided with a gas inlet, and air flowing in from the gas inlet and the flame generated by the combustor are mixed and combusted and then flow into the rotary drying kiln;
the wet flue gas treatment subsystem comprises a dust remover, a cooling tower and a secondary combustion chamber, wherein a flue gas inlet of the dust remover is connected with a flue gas outlet of the rotary drying kiln, a flue gas outlet of the dust remover is connected with a flue gas inlet of the cooling tower, and a flue gas outlet of the cooling tower is connected with a flue gas inlet of the secondary combustion chamber through a first branch pipe;
the circulating heat recovery subsystem comprises a heat exchanger, a flue gas return pipe and a flue gas discharge pipe, wherein one end of the flue gas return pipe is connected with a flue gas outlet of the cooling tower, the flue gas return pipe passes through the heat exchanger and then is connected with the mixed combustion chamber, one end of the flue gas discharge pipe is connected with a flue gas outlet of the secondary combustion chamber, and the flue gas discharge pipe passes through the heat exchanger and then is connected with a tail gas treatment device.
2. The system of claim 1, wherein said rotary kiln is disposed in a horizontally inclined manner.
3. The system of claim 2, wherein the rotary kiln has a sludge outlet at a lower end thereof and a sludge inlet at an upper end thereof.
4. The recycling system of claim 1, further comprising a spray water recycling subsystem including a reservoir, a cooling tower connected to the reservoir, and a water recycling pipe, wherein the water recycling pipe includes a first water pipe and a second water pipe, one end of the first water pipe is connected to the bottom tank section of the cooling tower, the other end of the first water pipe is connected to the cooling tower, one end of the second water pipe is connected to the reservoir, and the other end of the second water pipe is connected to the spray header of the cooling tower.
5. The recycling system according to claim 1, wherein an induced draft fan is provided on a connection pipe between the dust collector and the cooling tower, and an induced draft fan is provided on a connection pipe between the cooling tower and the secondary combustion chamber.
6. The recycling regenerative sludge treatment system according to claim 1, wherein the tail gas treatment device comprises a bag-type dust collector, a desulfurizing tower and a flue which are arranged in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922386755.0U CN212246737U (en) | 2019-12-26 | 2019-12-26 | Circulation backheating type sludge treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922386755.0U CN212246737U (en) | 2019-12-26 | 2019-12-26 | Circulation backheating type sludge treatment system |
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| CN212246737U true CN212246737U (en) | 2020-12-29 |
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| CN201922386755.0U Active CN212246737U (en) | 2019-12-26 | 2019-12-26 | Circulation backheating type sludge treatment system |
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| CN (1) | CN212246737U (en) |
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