CN216346273U - System for innocent treatment mud - Google Patents
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- CN216346273U CN216346273U CN202121646922.1U CN202121646922U CN216346273U CN 216346273 U CN216346273 U CN 216346273U CN 202121646922 U CN202121646922 U CN 202121646922U CN 216346273 U CN216346273 U CN 216346273U
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Abstract
The utility model provides a system for harmlessly treating sludge, which has the advantages of simple structure, low investment, operation and maintenance cost and suitability for wide popularization and application. It directly is used for sludge drying machine's dry heat source with integrative burning furnace exhaust high temperature flue gas, and sludge drying machine carries out the damp and hot peculiar smell waste gas that the sludge drying produced and directly sends into integrative burning furnace, carries out high temperature incineration, treats processing sludge at the primary incineration section and burns the processing, carries out the postcombustion at the postincineration section to carrying out the foul smell, carries out the deodorization and handles, and integrative burning furnace is provided with the postincineration section: the primary incineration section and the secondary incineration section ensure the retention time of the waste gas generated by combustion in a high-temperature incineration state.
Description
Technical Field
The utility model relates to the technical field of solid waste incineration treatment, in particular to a system for harmlessly treating sludge.
Background
Sludge (sludge) is a solid precipitated material produced by water and sewage treatment processes. The sludge is a thick substance between liquid and solid, and has the main characteristics of high water content (up to more than 99 percent), high organic matter content, easy decomposition and stink generation, fine particles, small specific gravity and colloidal liquid state.
The sludge treatment process commonly adopted in the prior art at present comprises the following steps: the method is characterized in that the sludge is dried by using steam, the dried sludge is sent into a sludge incinerator to be incinerated to generate hot flue gas, and the steam is generated by recovering the waste heat of the hot flue gas and is used for drying the sludge, so that the heat energy recycling mode is realized. The sludge treatment system includes: boiler, steam drier, a great deal of pressurized equipment such as steam conduit valve, the system is complicated, and is high to operation personnel, the requirement of equipment maintenance, and investment running cost all is higher, is not suitable for the area that cost control is more strict, is unfavorable for using widely.
Disclosure of Invention
In order to solve the problems of complex sludge treatment system and high investment and operation cost in the prior art, the utility model provides a system for harmlessly treating sludge, which has simple structure and low investment, operation and maintenance cost and is suitable for wide popularization and application.
The technical scheme of the utility model is as follows: the utility model provides a system of innoxious processing mud, its characterized in that, it includes, mud storage storehouse, its characterized in that, it still includes: a sludge dryer, an integrated incinerator and a flue gas treatment system; the integrated incinerator is communicated with the flue gas treatment system through heat exchange equipment;
the heat exchange equipment comprises a first GGH heat exchanger and a GAH heat exchanger which are communicated with each other;
the integrated incinerator is provided with a combustion chamber, a mixing chamber, a secondary incineration section and a primary incineration section which are communicated from top to bottom, a feeding port of the integrated incinerator is arranged at the primary incineration section, and a combustion-supporting air inlet is arranged at the bottom of the incinerator;
the material inlet of the sludge dryer is connected with the material outlet of the sludge storage bin, and the material outlet of the sludge dryer is connected with the material inlet of the integrated incinerator through a sludge feeding structure;
the top of the combustion chamber is provided with two smoke outlets: the first smoke outlet is connected with a drying heat source inlet of the sludge dryer; the second smoke outlet is connected with a hot side inlet of the first GGH heat exchanger; the hot side outlet of the first GGH heat exchanger is connected with the hot smoke inlet of the GAH heat exchanger;
an exhaust port of the sludge dryer is connected with a flue gas inlet of a dust collector, and a smoke outlet of the dust collector is connected to a cold side inlet of the first GGH heat exchanger; a cold side outlet of the first GGH heat exchanger is connected with the mixing chamber of the integrated incinerator;
an air outlet of the sludge storage bin is connected with a cold air inlet of the GAH heat exchanger, and a cold air outlet of the GAH heat exchanger is connected with the combustion-supporting air inlet at the bottom of the primary incineration section; and a hot smoke outlet of the GAH heat exchanger is connected with the smoke treatment system, and is discharged through a chimney after being treated by the smoke treatment system.
It is further characterized in that:
the flue gas treatment system comprises: a two-stage denitration structure, a two-stage dedusting structure and a wet deacidification device;
the two-stage denitration structure comprises: primary denitration equipment and secondary denitration equipment; the primary denitration device is an SNCR spray gun arranged in the 850 ℃ interval of the integrated incinerator, and the secondary denitration device is an SCR denitration reactor connected with the inlet of the chimney;
the two-stage dust removal structure comprises: the electrostatic dust collector is connected with a hot smoke outlet of the GAH heat exchanger, and the bag-type dust collector is arranged in front of the wet deacidification equipment;
a precooler is arranged on a flue between the bag-type dust remover and the wet deacidification equipment;
a flue gas heating device is arranged on a flue between the wet deacidification equipment and the SCR denitration reactor;
a flue gas outlet of the SCR denitration reactor after denitration is connected with a heat source inlet of the flue gas heating device, and a flue gas outlet of the flue gas heating device after heat exchange is connected with a chimney inlet;
the flue gas heating device comprises: a second GGH heat exchanger, an NGH fuel heater;
the flue gas outlet of the wet deacidification equipment is connected with the cold side flue gas inlet of the second GGH heat exchanger, the heated flue gas outlet of the second GGH heat exchanger is connected with the flue gas inlet of the NGH fuel heater, the heated flue gas outlet of the NGH fuel heater is connected with the to-be-treated flue gas inlet of the SCR denitration reactor, the denitrated flue gas outlet of the SCR denitration reactor is connected with the high-temperature clean flue gas inlet of the second GGH heat exchanger, and the heat-exchanged flue gas outlet of the second GGH heat exchanger is connected with the chimney inlet;
a dry reaction device is arranged on a flue gas channel between the electrostatic dust collector and the bag-type dust collector, and a slaked lime injection device and an activated carbon injection device are arranged in the dry reaction device;
the dry reaction equipment is realized based on a Venturi flue.
According to the system for harmlessly treating the sludge, provided by the utility model, high-temperature flue gas discharged by the integrated incinerator is directly used as a drying heat source of the sludge dryer, so that the problems of system complexity and low heat efficiency caused by secondary conversion of heat exchange equipment such as a boiler and the like are solved, the system is simplified, the waste heat utilization rate is improved, the heat energy loss is reduced, and the system operation cost is reduced; the sludge drier directly sends damp and hot peculiar smell waste gas generated by sludge drying into the integrated incinerator for high-temperature incineration, the sludge to be treated is incinerated in the primary incineration section, odor is secondarily combusted in the secondary incineration section for deodorization treatment, complete deodorization and VOC removal are ensured, an independent deodorization facility does not need to be configured for the wet odor, the construction cost is reduced, and the VOC operation cost is avoided; the whole system is all mechanical equipment without pressure equipment, the system is simple in structure, and the technical requirements on operators and the equipment maintenance cost are low.
Drawings
FIG. 1 is a schematic view of the connection structure of a sludge dryer, an integrated incinerator and a heat exchange device;
fig. 2 is a schematic structural diagram of a flue gas treatment system in the patent.
Detailed Description
The utility model relates to a system for harmlessly treating sludge, which comprises a sludge storage bin 1, a sludge dryer 2, an integrated incinerator 4 and a flue gas treatment system; the integrated incinerator 4 is communicated with the flue gas treatment system through heat exchange equipment; the heat exchange equipment comprises a first GGH (Gas heater) heat exchanger 5 and a GAH (Gas air heater) heat exchanger 6 which are communicated with each other, and the first GGH heat exchanger 5 and the GAH heat exchanger 6 realize the reutilization of heat energy sources based on the flue Gas/flue Gas heat exchange principle. Wet sludge from municipal sludge systems, common industrial sludge systems, hazardous waste industrial sludge systems and other sludge systems can be subjected to harmless treatment by the technical scheme.
As shown in figure 1, the integrated incinerator 4 is provided with a combustion chamber 4-4, a mixing chamber 4-3, a secondary incineration section 4-2 and a primary incineration section 4-1 which are communicated with each other from top to bottom, a feeding port 4-8 of the integrated incinerator 4 is arranged at the primary incineration section 4-1, and the bottom of the incinerator is provided with a combustion air inlet 4-6. The integrated incinerator 4 in the patent is a vertical rotary furnace, and a bottom is provided with a rotation driving device; the primary incineration section 4-1, the mixing chamber 4-3 and the secondary incineration section 4-2 are all provided with natural gas auxiliary combustion devices, natural gas is used as a raw material for combustion, and a natural gas inlet 4-5 is connected with external natural gas supply equipment; VOC in the flue gas is mainly subjected to final combustion elimination in the top combustion chamber 4-4; and discharging the burned slag through a slag discharge port 4-7 for subsequent landfill and comprehensive utilization.
Mud material loading structure includes: the sludge drying machine comprises a sludge feeding hopper 7, a lifting machine 22 and a feeder 8, wherein the sludge feeding hopper 7 is arranged on a lifting part of the lifting machine 22, the feeder 8 is arranged at a feeding port 4-8 of the integrated incinerator 4, and the sludge feeding hopper 7 moves between a discharging port 2-3 of the sludge drying machine 2 and the feeder 8 under the action of the lifting machine 22.
The integrated incinerator 4 in the patent adopts a two-section combustion design, semi-dry sludge is incinerated in a primary incineration section 4-1, the incineration temperature reaches 800-; in the secondary incineration section 4-2, the high-temperature flue gas is combusted to remove waste, the incineration temperature is 850-1050 ℃, the high-temperature flue gas is ensured to stay for 2-5 seconds in the secondary incineration section 4-2 during incineration, sufficient stay time is ensured, a perfect '3T + E' combustion working condition is achieved, and after the high-temperature flue gas is subjected to secondary incineration, harmful substances in the high-temperature flue gas can be thoroughly decomposed.
A feeding port of the sludge dryer 2 is connected with a discharge port of the sludge storage bin 1, a discharge port of the sludge storage bin 1 is provided with a sludge conveyer, a feeding machine and other devices, and sludge discharged from the sludge storage bin 1 is fed into the feeding port of the sludge dryer 2;
the discharge port 2-3 of the sludge dryer 2 sends the dried half-dry sludge to a sludge feeding port 4-8 arranged at the bottom of the integrated incinerator 4 through a sludge feeding structure.
Two smoke outlets are arranged at the top of the combustion chamber 4-4: a first smoke outlet 4-9 and a second smoke outlet 4-10, wherein the first smoke outlet 4-9 is connected with a drying heat source inlet 2-1 of the sludge dryer 2; the second smoke outlet 4-10 is connected with a hot side inlet 5-3 of the first GGH heat exchanger 5; the hot side outlet 5-4 of the first GGH heat exchanger 5 is connected to the hot smoke inlet 6-3 of the GAH heat exchanger 6.
In the patent, a part of high-temperature flue gas generated by the integrated incinerator 4 is introduced into the sludge dryer 2 as a drying heat source, and wet odor generated by sludge drying enters the integrated incinerator 4 to be subjected to combustion supporting and incineration deodorization treatment after being treated; the complete deodorization and VOC removal are ensured, an independent deodorization facility does not need to be configured for the moisture-containing odor, the construction cost of the system is reduced, and the additional investment cost for taking out the VOC is avoided; the other part of the high-temperature flue gas generated by the integrated incinerator 4 is used as a heat source of the first GGH heat exchanger 5, so that the heat is fully utilized, and the running cost of the system is reduced.
An exhaust port 2-2 of the sludge dryer 2 is connected with a flue gas inlet of a dust collector 3, and a smoke outlet of the dust collector 3 is connected to a cold side inlet 5-1 of a first GGH heat exchanger 5; a cold side outlet 5-2 of the first GGH heat exchanger 5 is connected with a mixing chamber 4-3 of the integrated incinerator 4 through a heating chamber 9; namely, the waste gas generated in the working process of the sludge dryer 2 is preheated by the first GGH heat exchanger 5 after the dust removal operation, then is sent into the mixing chamber, is mixed with combustion-supporting gas in the mixing chamber, and then is sent into the combustion chamber 4-4, and harmful substances such as VOC, dioxin and the like contained in the waste gas are removed through high-temperature combustion; and an independent tail gas combustion device is not required for treatment, so that the system operation cost is reduced.
An exhaust port 1-1 of the sludge storage bin 1 is connected with a cold air inlet 6-1 of a GAH heat exchanger 6, and a cold air outlet 6-2 of the GAH heat exchanger 6 is connected with a combustion air inlet 4-6 at the bottom of the primary incineration section 4-1; the hot smoke outlet 6-4 of the GAH heat exchanger 6 is connected with the smoke inlet 10-1 of the electrostatic dust collector 10 in the smoke treatment system, and is discharged through a chimney 20 after being treated by the smoke treatment system. Namely, the wet waste gas generated in the storage of the sludge storage bin 1 is sent to the primary incineration section 4-1 for combustion after heat exchange through the GAH heat exchanger 6, so that peculiar smell is removed, a separate smell removal device is not needed for treatment, and the system operation cost is reduced.
The sludge drying machine 2 in the patent adopts incineration high-temperature flue gas as a heat source, 50-85% of high-moisture sludge can be directly dried into 10-30% of low-moisture semi-dry sludge, the dried tail gas is heated and then sent into the integrated incinerator 4 to be incinerated at the high temperature of 850 ℃ through 760 + materials, harmful substances such as VOC organic matters such as peculiar smell and the like and dioxin are thoroughly decomposed, meanwhile, heat energy obtained by incineration of the organic matters in the tail gas is fully utilized in the integrated incinerator 4, and system energy consumption is further reduced.
As shown in fig. 2, in this patent, the flue gas treatment system includes: a two-stage denitration structure, a two-stage dedusting structure, a wet deacidification device 14, and a matched activated carbon distribution unit and a matched slaked lime distribution unit.
The two-stage denitration structure includes: primary denitration equipment and secondary denitration equipment; the first-stage denitration equipment is an SNCR spray gun 4-11 arranged at the 850 ℃ interval of the side wall of the secondary incineration section 4-2 in the integrated incinerator 4, the SNCR spray gun 4-11 is arranged in the area, the SNCR spray gun 4-11 is connected with a supply device of ammonia water or urea, and a denitration reducing agent is sprayed into the flue gas in the integrated incinerator 4, so that most of nitrogen oxides in the flue gas can be removed.
The two-stage dust removal structure includes: an electrostatic dust collector 10 connected with a hot smoke outlet 6-4 of the GAH heat exchanger 6 and a bag-type dust collector 12 arranged in front of a wet deacidification device 14.
The export of high temperature flue gas autobody incinerator 4 top includes the two-stage heat exchanger through indirect heating equipment: after the first GGH heat exchanger 5 and the GAH heat exchanger 6 are fully utilized, the flue gas enters the electrostatic dust collector 10 through a hot flue gas inlet 6-3 of the GAH heat exchanger 6 for dust removal treatment. In the patent, due to the characteristics of flue gas generated after sludge combustion, most of dust is separated from the flue gas and adsorbed on a dust collecting electrode under the action of an electric field; after passing through the electrostatic dust collector 10, large-particle dust can be removed, the dust removal efficiency can reach more than 95%, and the downstream cloth bag dust removal load can be greatly reduced.
A dry reaction device 11 is arranged on a flue gas channel between the electrostatic dust collector 10 and the bag-type dust collector 12, and a slaked lime injection device 11-2 and an activated carbon injection device 11-1 are arranged in the dry reaction device 11; spraying a certain amount of activated carbon powder in the section through an activated carbon spraying device 11-1 for adsorbing dioxin and heavy metals in the flue gas; spraying a certain amount of slaked lime powder in the section through a slaked lime spraying device 11 to remove acid substances such as sulfur dioxide, hydrogen chloride and the like in the flue gas; in the technical scheme of the patent, the dry reaction equipment 11 is realized based on a Venturi flue. The dry reaction equipment 11 realized based on the venturi flue can not only provide a reaction site, but also improve the flow rate of flue gas by the venturi flue, and ensure that the flue gas passing through the electrostatic dust collector 10 can smoothly enter the bag-type dust collector 12.
The high-speed flue gas is wrapped by the dust and the activated carbon powder sprayed in the dry method reaction equipment 11 and enters the bag-type dust remover 12, a layer of filter cake is formed on the surface of a filter bag of the bag-type dust remover 12, the filter cake can protect the bag from being stuck, and the formed filter cake is used as a base bed to facilitate the uniform distribution of the activated carbon powder and the adsorption of dioxin and heavy metals in the flue gas; the bag-type dust collector 12 collects most of the dust in the flue gas, and the dust is discharged out of the system through the dust hopper collection and dust conveying equipment. Meanwhile, the bag-type dust collector 12 is arranged in front of the wet desulphurization unit, so that the dust content of the tail gas of the system can be ensured to reach the standard, and the negative influence of dust on the wet desulphurization can be reduced
Because the flying dust that sack cleaner 12 collected contains active carbon and dioxin/heavy metal, belongs to the danger and gives up, must landfill alone, so through the hierarchical dust removal in this patent, set up electrostatic precipitator 10 in front of sack cleaner 12, ensure to reduce the play ash volume of sack cleaner 12, through improving general solid waste share, compress dangerous solid useless proportion, reduce secondary waste treatment cost, and then reduced system overall cost. In specific implementation, the ash hoppers 21 of the electrostatic dust collector 10 and the bag-type dust collector 12 are periodically rapped to remove ash, and dust is collected and respectively sent to a later comprehensive utilization process and a chelating landfill process.
The wet deacidification unit comprises a precooler 13 and a wet deacidification device 14; a precooler 13 is arranged on a flue between the bag-type dust collector 12 and the wet deacidification equipment 14; the wet deacidification equipment 14 in the patent is realized based on a secondary washing tower 14-1; firstly, the flue gas enters a precooler 13, precooling water spray is arranged in the precooler 13, and the temperature of the flue gas is reduced to about 70 ℃; the precooled flue gas then enters a secondary washing tower 14-1; the top of the secondary washing tower 14-1 is also provided with a primary demister 14-2 and a secondary demister 14-3; the second-stage washing tower 14-1 is simultaneously provided with a circulating slurry tank 14-4, washing water discharged from the second-stage washing tower 14-1, the first-stage demister 14-2 and the second-stage demister 14-3 is sent into the circulating slurry tank 14-4 through a circulating pump for treatment, and then sent into the second-stage washing tower 14-1, the first-stage demister 14-2 and the second-stage demister 14-3 for recycling, so that the operation cost of the system is reduced. In this patent, spray through the abundant circulating liquid in the second grade scrubbing tower 14-1 and realize the deep purification to the fume pollutants, cooperate the high-efficient defogging of top one-level defroster 14-2, second grade defroster 14-3 simultaneously, ensure that the tail gas of emission not only contains acid content and conforms to the compliance, and the fog index when it discharges also accords with tighter emission index.
A flue gas heating device is arranged on a flue between the wet deacidification equipment 14 and the SCR denitration reactor 16; the flue gas heating device comprises: the second GGH heat exchanger 15 and the NGH fuel heater 17, wherein the second GGH heat exchanger 15 realizes the reutilization of heat energy based on the flue gas/flue gas heat exchange principle; a flue gas outlet of the wet deacidification equipment 14 is connected with a flue gas inlet 15-1 at the cold side of a second GGH heat exchanger 15, a heated flue gas outlet 15-2 of the second GGH heat exchanger 15 is connected with a flue gas inlet of an NGH fuel heater 17, a heated flue gas outlet of the NGH fuel heater 17 is connected with a flue gas inlet to be treated of an SCR denitration reactor 16, a denitrated flue gas outlet of the SCR denitration reactor 16 is connected with a high-temperature clean flue gas inlet 15-3 of the second GGH heat exchanger 15, a heat-exchanged flue gas outlet 15-4 of the second GGH heat exchanger 15 is connected with an inlet of a chimney 20, and flue gas discharged from the heat-exchanged flue gas outlet 15-4 of the second GGH heat exchanger 15 is guided into the inlet of the chimney 20 through an induced draft fan 19.
The second GGH heat exchanger 15 fully utilizes the waste heat of the high-temperature flue gas discharged from the flue gas outlet after the SCR denitration reactor 16 performs denitration, and preheats the flue gas discharged from the wet deacidification equipment 14, so that the heat of the system is fully utilized, and the operation cost of the system is reduced; an NGH (natural gas hydrate) fuel heater 17 is arranged at a flue gas inlet 15-1 at the cold side of the GGH, and a natural gas burner is adopted to directly heat the flue gas so as to meet the temperature required by the SCR denitration catalyst.
The SCR denitration reactor 16 is a second-stage denitration device in a two-stage denitration structure in the system. The flue gas after denitration treatment, two-stage dust removal treatment and wet deacidification treatment is heated by a second GGH heat exchanger 15 and an NGH fuel heater 17 in the flue gas heating device in two stages to reach the SCR denitration reaction temperature, passes through an ammonia injection grid 18, is mixed with ammonia gas in a static mixer 21 and is simultaneously sent to an SCR denitration reactor 16; and a denitration reducing agent is sprayed into the SCR denitration reactor 16, and a catalytic reduction reaction is carried out under the action of a catalyst, so that the nitrogen oxides in the flue gas are fully decomposed, and the emission requirement is met.
The induced draft fan 19 is arranged between the outlet of the SCR denitration reactor 16 and the inlet of the chimney 20, so that the whole treatment system is ensured to be in a negative pressure state, and the leakage of the unpurified and complete flue gas in the system is effectively prevented.
A sludge harmless treatment method realized based on a harmless treatment sludge system comprises the following steps.
S1: and (3) conveying the sludge to be treated stored in the sludge storage bin 1 into a sludge dryer 2 for drying treatment. During specific implementation, according to the treatment capacity of the sludge dryer 2, feeding data and feeding frequency are set through a central control system based on the existing material conveying equipment such as a spiral receiving hopper, and the materials are metered and fed in time by time.
S2: in the sludge dryer 2, drying treatment is carried out on sludge to be treated based on a flue gas direct heating drying process; and (4) sending the dried semi-dry sludge to be treated into the integrated incinerator 4.
S3: the integrated incinerator 4 comprises two combustion sections;
conveying sludge to be treated into a primary incineration section 4-1 at the bottom, pressurizing combustion-supporting air by a fan, then quickly spraying the pressurized combustion-supporting air into the primary incineration section 4-1 from the bottom according to a preset angle, fully contacting the pressurized combustion-supporting air with the sludge to be treated, and pyrolyzing and incinerating the sludge to be treated under self heat value and fuel auxiliary heating;
the combustion-supporting air is continuously fed, mixed with the flue gas into rotational flow and enters a secondary incineration section 4-2 at the upper part of the integrated incinerator 4; oxygen in combustion-supporting air and volatile gas which is not completely combusted once are incinerated again, the temperature of flue gas can reach 850-1050 ℃, the flue gas is mixed very strongly, the residence time is long, the combustion requirements of 3T + E' are fully met, and the combustion efficiency and the decomposition rate of harmful substances are greatly improved; after sufficient combustion time, the harmful substances such as organic matters, dioxin and the like in the flue gas are ensured to be thoroughly decomposed; meanwhile, due to the staged air supply combustion, the method is very beneficial to inhibiting the generation of NOx, and can reach the environmental-friendly emission standard without treatment.
In the concrete implementation, the structures such as a combustion-supporting air inlet 4-6 at the bottom of the primary incineration section 4-1 and a gas distribution unit, a laminar flow channel, a fuel nozzle and the like which are needed to be used for generating rotational flow by the combustion-supporting air are realized by using the existing burner technology.
S4: the wet odor generated in the working process of the sludge storage bin 1 and the sludge dryer 2 is sent into the integrated incinerator 4, and is led to the integrated incinerator 4 through the air drying and gasifying exhaust fan, oxygen in the wet odor participates in combustion supporting, and the odor and VOC are decomposed and deodorized at high temperature.
S5: a part of high-temperature flue gas generated after secondary combustion in the integrated incinerator 4 is taken as a heat source and introduced into the sludge dryer 2, and the high-temperature flue gas is taken as a heat source to carry out drying treatment on wet sludge; the other part is used as a heat source of heat exchange equipment to preheat the moisture-containing odor generated in the working process of the sludge storage bin 1 and the sludge dryer 2;
s6: the gas generated in the treatment process is subjected to flue gas purification treatment by a flue gas treatment system and then discharged from a chimney 20.
The flue gas purification treatment comprises the following steps:
a 1: after the sludge to be treated is combusted in the primary incineration section 4-1, the generated flue gas is subjected to primary denitration treatment by primary denitration equipment arranged in the integrated incinerator 4 at the temperature of 850 ℃, and then is sent to the secondary incineration section 4-2;
a 2: the flue gas generated by the integrated incinerator 4 is sent to a two-stage dust removal structure in sequence after passing through a heat exchange device, and is subjected to dust removal treatment through an electrostatic dust removal process and a cloth bag dust removal process respectively;
after the flue gas is subjected to dust removal treatment by an electrostatic dust removal process, the flue gas is firstly sent into a dry reaction device 11, the dry reaction device 11 sprays activated carbon powder and slaked lime powder to remove attached dioxin, heavy metals and acidic substances in the flue gas, and then the flue gas is sent into a bag-type dust remover 12 for secondary dust removal treatment;
a 3: cooling the dedusted flue gas by a precooler 13, and then sending the cooled flue gas into a wet deacidification device 14 to eliminate acid pollutants in the flue gas;
before the step a4 is implemented, the flue gas after wet deacidification is preheated by the second GGH heat exchanger 15, then sent into the NGH fuel heater 17 for heating, and then subjected to second denitration treatment.
a 4: the heated flue gas is sent to the SCR denitration reactor 16 for a second denitration treatment, and nitrogen oxides in the flue gas are sufficiently decomposed and then discharged to the atmosphere through the chimney 20.
Compared with the prior art, in the harmless sludge disposal system, the whole system is mechanical equipment without pressure equipment, the system structure is simple, and the technical requirements on operators and the equipment maintenance cost are low; and the heat energy in the system does not need to be converted, the heat energy is directly utilized for sludge drying, the heat utilization rate is high, the energy in the system is fully utilized, and the operation cost is low. In the process, the sludge is dried by directly utilizing the hot flue gas, and the dried sludge is sent into the integrated incinerator to generate the hot flue gas which is directly used for drying the sludge to form heat energy balance. Especially aiming at the characteristic of large discharge amount of peculiar smell and moisture generated by sludge smoke drying, the 100 percent high-temperature deodorization process for the peculiar smell and the moisture is creatively provided, the problem that short plate-peculiar smell and moisture deodorization of the sludge smoke drying is difficult is thoroughly solved, and a core link is opened for popularization and application of the sludge smoke drying. Meanwhile, the flue gas generated in the sludge treatment process is subjected to two-stage dust removal of electrostatic dust removal and cloth bag dust removal, the flue gas denitration is performed by two-stage denitration of SNCR and SCR, and the flue gas desulfurization is performed by a two-stage desulfurization method of dry slaked lime desulfurization and wet lime desulfurization, so that the flue gas finally discharged into the atmosphere completely meets the strict environmental-protection emission standard.
Claims (5)
1. The utility model provides a system of innoxious processing mud, its characterized in that, it includes, mud storage storehouse, its characterized in that, it still includes: a sludge dryer, an integrated incinerator and a flue gas treatment system; the integrated incinerator is communicated with the flue gas treatment system through heat exchange equipment;
the heat exchange equipment comprises a first GGH heat exchanger and a GAH heat exchanger which are communicated with each other;
the integrated incinerator is provided with a combustion chamber, a mixing chamber, a secondary incineration section and a primary incineration section which are communicated from top to bottom, a feeding port of the integrated incinerator is arranged at the primary incineration section, and a combustion-supporting air inlet is arranged at the bottom of the incinerator;
the material inlet of the sludge dryer is connected with the material outlet of the sludge storage bin, and the material outlet of the sludge dryer is connected with the material inlet of the integrated incinerator through a sludge feeding structure;
the top of the combustion chamber is provided with two smoke outlets: the first smoke outlet is connected with a drying heat source inlet of the sludge dryer; the second smoke outlet is connected with a hot side inlet of the first GGH heat exchanger; the hot side outlet of the first GGH heat exchanger is connected with the hot smoke inlet of the GAH heat exchanger;
an exhaust port of the sludge dryer is connected with a flue gas inlet of a dust collector, and a smoke outlet of the dust collector is connected to a cold side inlet of the first GGH heat exchanger; a cold side outlet of the first GGH heat exchanger is connected with the mixing chamber of the integrated incinerator;
an air outlet of the sludge storage bin is connected with a cold air inlet of the GAH heat exchanger, and a cold air outlet of the GAH heat exchanger is connected with the combustion-supporting air inlet at the bottom of the primary incineration section; and a hot smoke outlet of the GAH heat exchanger is connected with the smoke treatment system, and is discharged through a chimney after being treated by the smoke treatment system.
2. The system for harmlessly disposing sludge according to claim 1, wherein: the flue gas treatment system comprises: a two-stage denitration structure, a two-stage dedusting structure and a wet deacidification device;
the two-stage denitration structure comprises: primary denitration equipment and secondary denitration equipment; the primary denitration device is an SNCR spray gun arranged in the 850 ℃ interval of the integrated incinerator, and the secondary denitration device is an SCR denitration reactor connected with the inlet of the chimney;
the two-stage dust removal structure comprises: the electrostatic dust collector is connected with a hot smoke outlet of the GAH heat exchanger, and the bag-type dust collector is arranged in front of the wet deacidification equipment;
a precooler is arranged on a flue between the bag-type dust remover and the wet deacidification equipment;
a flue gas heating device is arranged on a flue between the wet deacidification equipment and the SCR denitration reactor;
and a flue gas outlet of the SCR denitration reactor after denitration is connected with a heat source inlet of the flue gas heating device, and a flue gas outlet of the flue gas heating device after heat exchange is connected with a chimney inlet.
3. The system for harmlessly disposing sludge according to claim 2, wherein: the flue gas heating device comprises: a second GGH heat exchanger, an NGH fuel heater;
the flue gas outlet of the wet deacidification equipment is connected with the flue gas inlet at the cold side of the second GGH heat exchanger, the heated flue gas outlet of the second GGH heat exchanger is connected with the flue gas inlet of the NGH fuel heater, the heated flue gas outlet of the NGH fuel heater is connected with the flue gas inlet to be treated of the SCR denitration reactor, the denitrated flue gas outlet of the SCR denitration reactor is connected with the high-temperature clean flue gas inlet of the second GGH heat exchanger, and the heat-exchanged flue gas outlet of the second GGH heat exchanger is connected with the chimney inlet.
4. The system for harmlessly disposing sludge according to claim 2, wherein: a flue gas channel between the electrostatic dust collector and the bag-type dust collector is provided with a dry reaction device, and a slaked lime injection device and an activated carbon injection device are arranged in the dry reaction device.
5. The system for harmlessly disposing sludge according to claim 4, wherein: the dry reaction equipment is realized based on a Venturi flue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121646922.1U CN216346273U (en) | 2021-07-20 | 2021-07-20 | System for innocent treatment mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121646922.1U CN216346273U (en) | 2021-07-20 | 2021-07-20 | System for innocent treatment mud |
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| CN216346273U true CN216346273U (en) | 2022-04-19 |
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