CN208562102U - A kind of sewage sludge gas heat carrier classification low temperature pyrogenation system - Google Patents

Abstract

The utility model discloses a kind of sewage sludge gas heat carriers to be classified low temperature pyrogenation system, including the distributing device for stirring former and being connected to stirring former outlet end, the surface of porous metals band is arranged in the outlet end of distributing device, the transmission direction of porous metals band successively passes through dry reactor, pyrolysis reactor and dry coke quenching reactor, and porous metals end of tape stretches out dry coke quenching reactor for exporting semicoke；By part semicoke back-mixing, it is formed with after raw sewage stirring, mud granule layer cloth is carried out in porous metals band, in a manner of gas heat carrier classification pyrolysis, in conjunction with system process such as Dry Quenching, tar recycling, pyrolysis gas reuses, realize pyrolyzing sludge system modular, multiple dust suppression reduces tar dust content, improve added value of product, reduce the energy consumption of pyrolyzing sludge, the moisture in sludge has been recycled, has substantially reduced seriously polluted pyrolysis phenol wastewater water, is obviously improved the economy of technique.

Description

A kind of sewage sludge gas heat carrier classification low temperature pyrogenation system

Technical field

The utility model belongs to technical field of sludge disposal more particularly to a kind of sewage sludge gas heat carrier classification low temperature pyrogenation System.

Background technique

With rising year by year for wastewater treatment in China rate, it is enriched 50% or more heavy metal and 90% or more in sewage and causes a disease The sludge yield of microorganism is increasing, if cannot effectively dispose, the extent of injury will be very serious, and country puts into effect " water in recent years Prevention and cure of pollution action plan " the multinomial policy such as (i.e. " ten, water "), emphasize that sludge must be disposed properly.Pyrolytic technique, i.e., Sludge is heated under anaerobic or anoxia condition, by heat and mass transfer process, obtains pyrolysis gas, tar, semicoke.The pyrolysis skill of sludge Compared to other disposal technologies, the economical good, advantages such as pollutant emission is few, thermal decomposition product Exploitative potential is big have become art For research hotspot.

General sewage plant needs the dewatered sludge moisture content disposed 80% or so, if being directly pyrolyzed, energy consumption is huge, and It generates and is largely pyrolyzed waste water containing phenol, it is seriously polluted.If can equally generate and be difficult to using the cooling semicoke of the modes such as water spray, water seal The highly concentrated phenol wastewater of disposition.Some patented technologies are pyrolyzed using solid thermal carriers, external-heat, there are mass-and heat-transfer unevenness, are set The problems such as standby abrasion is big, the thermal efficiency is low, processing capacity is small, the reaction time is long.In addition, the one of limitation pyrolyzing sludge technical industry A major reason is in tar that dust content is excessively high, big using difficulty, has seriously affected the economy of technique.

Utility model content

In order to solve the problems in the existing technology, the purpose of the utility model is to provide a kind of sewage sludge gas heat carriers It is classified low temperature pyrogenation system, will be formed after semicoke back-mixing, with raw sewage stirring, carry out mud granule layer cloth in porous metals band Material, in conjunction with system process such as Dry Quenching, tar recycling, pyrolysis gas reuses, is realized in a manner of gas heat carrier classification pyrolysis Pyrolyzing sludge system modular, multiple dust suppression reduce tar dust content, improve added value of product, reduce sludge The energy consumption of pyrolysis, has recycled the moisture in sludge, substantially reduces seriously polluted pyrolysis phenol wastewater water, makes the economy of technique Property is obviously improved.

To achieve the goals above, the technical solution adopted in the utility model is that a kind of sewage sludge gas heat carrier classification is low Warm pyrolysis system, including the distributing device for stirring former and being connected to stirring former outlet end, the outlet end of distributing device is set It sets in the surface of porous metals band, the transmission direction of porous metals band is successively passed through dry reactor, pyrolysis reactor and done Quenching reactor, and porous metals end of tape stretches out dry coke quenching reactor for exporting semicoke.

The gas outlet end of the dry reactor is sequentially connected water cooling dust arrester and cooling de-watering device, and dry reactor produces Raw cyclic drying flue gas is sent into the cloth gas chamber of dry coke quenching reactor after water cooling dust arrester and cooling de-watering device, and dry coke quenching is anti- It answers the part hot fume that flue gas and hot-blast stove provide after the quenching generated in device to pass through pipeline and is connected to dry gas mixing chamber, do Pathogenic dryness mixing chamber is connected to the air distribution plate below porous metals band；

The part hot fume and cooled coal gas that hot-blast stove provides are connected to cooled coal gas with greenhouse, and cooled coal gas is connected to heat with greenhouse The gas input of reactor is solved, the gas output end of pyrolysis reactor is connected with high-temperature gas-solid separation system in turn and tar returns Receipts system, the waste pyrolysis gas containing tar gas enters coke tar recovery system trapping in high-temperature gas-solid separation system after dedusting burnt Oil.

The output end of the hot-blast stove and the gas output end of coke tar recovery system are connected to cooled coal gas with greenhouse, tar Recovery system and cooled coal gas, which are matched, is connected with cooled coal gas blower between greenhouse；Cooled coal gas is connected to pyrolytic reaction with the output end in greenhouse The gas input of device.

Dry quenching blower is connected between the water cooling dust arrester and cooling de-watering device.

The reaction chamber of dry reactor is stretched out in the starting point of the porous metals band.

The heat source of hot-blast stove is natural gas or liquefied gas, and the supplemental heat source of hot-blast stove is cooled coal gas.

Method for pyrolysis is carried out using Tthe utility model system, specifically includes the following steps:

Step 1: it is thoroughly mixed uniformly in stirring former by dewatered sludge and by the sludge semicoke of dry coke quenching It obtains mixture and is shaped to mud granule in stirring former；Then pass through cloth system for mud granule in porous metals It takes and is laid in the bed of material；

Step 2: after the bed of material is laid with, rotation porous metals band drives mud granule to enter dry reactor, by 105 ~200 DEG C of cyclic drying flue gas is passed through dry reactor, directly contacts with mud granule and is dried mud granule to containing Water rate is less than 20%；

Step 3: mud granule after dry enters pyrolysis reactor with porous metals band, by 450~700 DEG C of load The cloth gas chamber that hot gas is passed through pyrolysis reactor lower part is uniformly dispersed, and directly contacts and is pyrolyzed with the mud granule after drying, when When the lattice gold tar yield of material is lower than 1%, pyrolysis is completed；

Step 4: the semicoke for being pyrolyzed completion enters dry coke quenching reactor with porous metals band and carries out dry coke quenching.

In the step 1, the dewatered sludge include moisture content be 70%~90% municipal sludge and industrial sludge, Dewatered sludge is mixed with by the sludge semicoke of dry coke quenching, and controls the moisture content of mixture below 70%；Mud granule Partial size is 2mm~20mm, and thickness of feed layer is less than 2000mm, and the aperture of porous metals band is less than the partial size of mud granule.

In the step 2, flue gas mixes in dry gas mixing chamber with the part hot fume that hot-blast stove provides after quenching Even to obtain cyclic drying flue gas, during mud granule is dried, the cyclic drying flue gas for flowing through the bed of material is mingled with dampening Point, the entrances water cooling dust arresters of fine dust particles, pressurize after deviating from dust particles and partial moisture by dry quenching blower and After the water removal of cooling de-watering device, cyclic drying flue gas enters dry coke quenching reactor by air distribution plate, with the heat in dry coke quenching reactor Flue gas after quenching is obtained after semicoke contact heat-exchanging, flue gas enters dry gas mixing chamber after quenching.

In the step 3, the part hot fume and cooled coal gas of hot-blast stove form heat-carrying after cooled coal gas matches and matches temperature in greenhouse Gas, heat-carrying gas is mingled with during fine dust flows through material bed and collides and inhale with the mud granule in material bed in pyrolytic process Attached, part fine dust is trapped, and remaining dust enters high-temperature gas-solid separation system with the pyrolysis gas containing tar gas and is removed；It Afterwards, pyrolysis gas enters coke tar recovery system recycling tar, while being cooled to 30~80 DEG C and obtaining cooled coal gas.

In the step 3, the heat source of hot-blast stove is natural gas or liquefied gas, and pyrolysis gas passes through high-temperature gas-solid separation system The cooled coal gas obtained with coke tar recovery system provides hot fume institute calorific requirement as supplemental heat source, joint.

Compared with existing pyrolyzing sludge technology, the utility model is at least had the advantages that through semicoke back-mixing, drop The low moisture content of dewatered sludge, reduces the load of desiccation and subsequent pyrolysis；By desiccation, pyrolysis classification, sludge can be recycled Outer water reduces the yield of phenol wastewater in pyrolytic process, reduces energy consumption, shortens pyrolysis time；It is de-, material bed by dry air-blowing The multiple actions such as collision absorption, high-temperature gas-solid separation, realize efficiently separating for fine dust, promote tar quality；Desiccation, pyrolysis, Quenching closely connects, and conveying cost is small；Each link is that internal heat type directly exchanges heat, and mass transfer is uniform, and heat transfer is efficient；Dry air and heat solution Coal gas recycles, and material is brief；System move equipment include roller bearing, dry quenching blower, cooled coal gas blower etc. be arranged at it is low Warm area, tar in gas, water content are low, move the stable and reliable operation of equipment, wear small.

The system of the utility model realize classification pyrolysis because pyrolysis waste water phenol content it is very high, processing difficulty compared with Greatly, sludge is dried in dry reactor first for the utility model, can be good at reducing institute in mud granule The moisture contained, and do not make wherein a large amount of fugitive constituent evolution, the sewage generated at this time is easier to carry out treatment for reuse, for rear For continuous pyrogenic processes, it is capable of the reduction energy consumption of high degree, and shortens the time of pyrolysis, improve efficiency, reduces heat The generation of waste water is solved, cost for wastewater treatment is reduced, environment-friendly advantage is obvious；Porous metals band is driven using roller bearing, and then drives material Layer movement is pyrolyzed, and when pyrolysis gas passes through the bed of material, dust therein can realize collision with the bed of material, adsorb from dedusting, is reduced Into subsequent workshop section's fine dust total amount, subsequent dedusting link load is reduced, sludge tar dust content is reduced, promotes its quality, Desiccation simultaneously, pyrolysis, quenching closely link, and energy recovery rate is high, save material and convey cost；In the quenching stage, this is practical new Type uses Dry Quenching, does not generate the sewage that wet quenching is difficult to dispose, and semicoke quality is more preferable；In addition, in the utility model Gas heat carrier directly contacted with sludge and to carry out desiccation, pyrolysis and quenching, good effect of heat exchange, it is easy to accomplish dust, moisture Separation, and desiccation, pyrolysis gas are realized and are recycled, efficiency is high, and industrialization difficulty is small；Further, dry quenching blower and The dynamic equipment such as cooled coal gas blower is arranged at low-temperature space, and component mechanically deform is small, and the tar of low-temperature space or water content are lower, The abrasion for reducing equipment ensure that the reliable and stable of equipment operation.The utility model also achieves dry quenching, pyrolytic incineration Double gas circuit circulations, can adequately recycle the gas material in the course of work, further reduce energy and material consumption It improves efficiency.

Detailed description of the invention

Fig. 1 is the system structure diagram of the utility model.

Fig. 2 is the material bed structure schematic diagram that mud granule is formed in the utility model.

Structural schematic diagram of the Fig. 3 between porous metals band and each reactor.

In attached drawing: 1. stirring formers, 2. distributing devices, 3. dry reactors, 4. pyrolysis reactors, the reaction of 5. dry coke quenching Device, 6. water cooling dust arresters, 7. dry quenching blowers, 8. cooling de-watering devices, 9. dry gas mixing chambers, 10. high-temperature gas-solid segregative lines System, 11. coke tar recovery systems, 12. cooled coal gas blowers, 13. hot-blast stoves, 14. cooled coal gas match greenhouse, 31. porous metals bands, 311. Roller bearing, the 32. sludge bed of materials, 33. air distribution plates, 34. heat carrier imports, 35. heating medium outlets, 101. sewage sludge feeds.

Specific embodiment

The technical solution of the utility model is described further with reference to the accompanying drawings and examples.

The utility model includes molding-cloth system, drying-dry quenching system, pyrolysis system and separation-recovery system, Wherein, in molding-cloth system, dewatered sludge is thoroughly mixed with by Dry Quenching, non-hypergolic semicoke, and ball is made Shape particle is distributed on the porous metals band of roller bearing transmission with certain thickness, and into drying-dry quenching system, hot fume is passed through Cloth gas chamber below dry reactor and porous metals band, pass through material bed, take away moisture and fine dust particles；It is aqueous, dust-laden is warm Flue gas pressurizes after the cyclone separator of indirect water-cooling by blower, from top be sent into dry coke quenching reactor cloth gas chamber into Row quenching, after passing through semicoke and porous metals band, the dry flue gas by cooling enters dry gas mixing chamber and self-heating is carried out in part The flue gas of wind furnace mixes, and into dry reactor, forms circulation.By dry sludge, with porous metals band, into pyrolysis System；Hot fume in hot-blast stove is most of mixed with greenhouse in cooled coal gas with cooled coal gas all the way other than supplementing dry gas on a small quantity After conjunction, by the cloth gas chamber and porous metals band of pyrolysis reactor lower part, pyrolysis is come into full contact with sludge；Heat containing tar gas It vents one's spleen and is dusted at the top of pyrolysis reactor into separation-recovery system, recycles tar, clean cooled coal gas draft fan one Road is sent into hot-blast stove and burns recycling heat, and institute's heat production flue gas is used for drying, pyrolysis.

As shown in Figure 1, Figure 2 and Figure 3, the system of the utility model includes stirring former 1 and being connected to stirring to form The surface of porous metals band 31, the biography of porous metals band 31 is arranged in the distributing device 2 of 1 outlet end of device, the outlet end of distributing device 2 Dry reactor 3, pyrolysis reactor 4 and dry coke quenching reactor 5 are successively passed through in defeated direction, and 31 end of porous metals band is stretched out and done Quenching reactor 5 stretches out the reaction chamber of dry reactor 3 for exporting semicoke, the starting point of porous metals band 31；

The gas outlet end of dry reactor 3 is sequentially connected water cooling dust arrester 6 and cooling de-watering device 8, and dry reactor 3 produces Raw dry flue gas is sent into the cloth of dry coke quenching reactor 5 after water cooling dust arrester 6, dry quenching blower 7 and cooling de-watering device 8 Gas chamber, the part hot fume that the circulating flue gas and hot-blast stove 13 generated in dry coke quenching reactor 5 provides are connected to by pipeline Dry gas mixing chamber 9, dry gas mixing chamber 9 are connected to the air distribution plate 33 of 31 lower section of porous metals band；

13 main line of hot-blast stove and one piping connection of cooled coal gas to cooled coal gas match greenhouse 14, coke tar recovery system 11 and cold coal Gas, which is matched, is connected with cooled coal gas blower 12 between greenhouse 14；Cooled coal gas is connected to the gas input of pyrolysis reactor 4, heat with greenhouse The gas output end of solution reactor 4 is connected with high-temperature gas-solid separation system 10 and coke tar recovery system 11 in turn, contains tar gas Waste pyrolysis gas in high-temperature gas-solid separation system 10 after dedusting enter coke tar recovery system 11 in trap tar；

Carrying out sewage sludge gas heat carrier classification low temperature pyrogenation using the system of the utility model, specific step is as follows:

(1) firstly, the dewatered sludge by moisture content 70%~90% is being stirred into the sludge semicoke by dry coke quenching It is thoroughly mixed in type device 1 and uniformly obtains mixture, mix the moisture content of obtained mixture 70% hereinafter, and passing through The temperature of the sludge semicoke of dry coke quenching is 60~100 DEG C, and is shaped to partial size between 2mm~20mm in stirring former 1 Mud granule；Cloth system 2 is utilized later, and it is more less than its particle size that molding mud granule is uniformly laid on aperture On mesoporous metal band, the bed of material with a thickness of 2~2000mm is formed；

In this step, the sludge semicoke by dry coke quenching being previously mentioned is this system material outlet end by dry coke quenching The mud granule of process, this partial sludge particle partial reflux to feed stage carry out the mixing of material with dewatered sludge, into one Step reduces the moisture content of dewatered sludge, so that dewatered sludge is had better physicochemical property, can form cloth, formed grain bed from And be dried and pyrolytic reaction, so that heat carrier comes into full contact with material, reduces pressure drop and reach better heat and mass effect.

(2) by roller bearing, so that metal belt transmission, drives mud granule to enter dry reactor 3, cyclic drying gas and heat The part hot fume that wind furnace 13 provides is uniformly mixed in dry gas mixing chamber 9 and heats up to cyclic drying flue gas, and temperature is 105~200 DEG C, enter dry reactor 3 later, cyclic drying flue gas is directly contacted with mud granule, in the utility model In specific embodiment, the cyclic drying flue-gas temperature of (gas vent being connected to water cooling dust arrester 6) is exported 50~120 DEG C, then it is mingled with moisture, the cyclic drying flue gas of fine dust particles enters water cooling dust arrester 6, abjection dust particles and part Moisture, while 30~50 DEG C can be cooled to, removed water by the dry pressurization of quenching blower 7 and cooling de-watering device 8 and discharge off-gas Afterwards, cyclic drying flue gas enters dry coke quenching reactor 5 by the way that the air distribution plate at 5 top of dry coke quenching reactor or bottom is arranged in, Dry gas mixing chamber 9 is delivered to after 500 DEG C or so hot semicoke direct contact heat transfers；Mud granule is done in dry reactor 3 It is dry to moisture content less than 20%, complete drying to mud granule；

(3) mud granule enters pyrolysis reactor 4 with porous metals band；Using with natural gas or liquefied gas as heat source, it is cold Coal gas provides hot fume institute calorific requirement as supplemental heat source, joint；Hot fume matches temperature by cooled coal gas with greenhouse 14 in cooled coal gas After obtain heat-carrying gas, temperature is at 450~700 DEG C, and the cloth gas chamber for initially entering 4 lower part of pyrolysis reactor is uniformly dispersed, Zhi Houyu Dry mud granule directly contacts；Since the bed of material has certain thickness, and a medium density, dryer section is not removed and newly generated Fine dust collides adsorption effect during following air-flow to move upwards with mud granule, and part fine dust is trapped, portion It enters high-temperature gas-solid separation system 10 and is removed with the pyrolysis gas containing tar gas for point dust；Pyrolysis gas enters tar and returns later Receipts system 11 recycles tar, while being cooled to 30~80 DEG C and obtaining cooled coal gas, after cooled coal gas blower 12, part reuse burning And with temperature, gas circulation is completed in discharge system disposition in part；When the lattice gold tar yield for the semicoke being located in pyrolysis reactor 4 When below 1%, pyrolysis is completed；The semicoke that porous metals band 31 completes pyrolysis is sent into dry coke quenching reactor, and dry coke quenching is anti- Device 5 is answered to control the temperature of mud granule at 80 DEG C or less.

It is reasonable by the sludge semicoke temperature setting of dry coke quenching, then VOC will not be caused to escape because of temperature is excessively high, with dehydration The physicochemical characteristic of material is more preferable after sludge mixing；In dryer section, dry gas is contacted with material has taken away part fine dust, alleviates Subsequent dedusting pressure；The partial size of mud granule need to be arranged rationally, and the too small gas pressure drop that will lead to of partial size is excessive, heat and mass effect Fruit, dust removing effects are poor, and partial size is excessive, will lead to desiccation and are pyrolyzed insufficient, elongation pyrolysis time, reduction reactor disposing capacity.

As shown in Fig. 2, the bed of material forms the grain bed with filtration in pyrolytic process, it can be by colliding, inhaling Fine dust is trapped in grain bed by the effects of attached, electrostatic, and fine dust is avoided to enter subsequent workshop section with pyrolysis gas, reduces subsequent removes Dirt, tar recycle section load.

The a certain specific embodiment of the utility model, the dewatered sludge of moisture content 70%~90% and the half of 60~100 DEG C Coke is in stirring former according to mass ratio (0.5~5): 1 is thoroughly mixed, and is shaped to the mud granule of partial size 3mm, Effective aperture is cloth on the porous alloy steel of 2mm, and bed of material width is 2m, thickness 20mm.After material enters dryer section, with 150 DEG C dry flue gas directly contacts, and hot fume outlet temperature maintains 100 DEG C, and residence time 70min, moisture percentage in sewage sludge is down to 10%, Subsequently enter pyrolysis reactor.In pyrolysis reactor, sludge comes into full contact with 550 DEG C of hot fume, sludge retention time 80min, the temperature that the waste pyrolysis gas containing tar gas goes out reactor is 480 DEG C, by high-temperature gas-solid separation system, tar recycling system System removes chalk dust removing and collects tar, and it is sharp again to carry out energy regenerating for discharge system after the pyrolysis gas without tar is cooled to 50 DEG C With.Semicoke enters dry quenching system later, directly contacts cooling with 30 DEG C of dry flue gas through supercooling, dedusting, water removal, stops Time 30min, semicoke are cooled to 80 DEG C, 60 DEG C of cyclic drying flue gas exit temperature.

Claims (6)

1. a kind of sewage sludge gas heat carrier is classified low temperature pyrogenation system, which is characterized in that including stirring former (1) and connect Stirring former (1) outlet end distributing device (2), distributing device (2) outlet end setting porous metals band (31) just on Side, the transmission direction of porous metals band (31) successively pass through dry reactor (3), pyrolysis reactor (4) and dry coke quenching reactor (5), and dry coke quenching reactor (5) are stretched out for exporting semicoke in porous metals band (31) end.

2. a kind of sewage sludge gas heat carrier according to claim 1 is classified low temperature pyrogenation system, which is characterized in that described dry The gas outlet end of dry reactor (3) is sequentially connected water cooling dust arrester (6) and cooling de-watering device (8), and dry reactor (3) generates Cyclic drying flue gas the cloth gas chamber of dry coke quenching reactor (5) is sent into after water cooling dust arrester (6) and cooling de-watering device (8), The part hot fume that flue gas and hot-blast stove (13) provide after the quenching generated in dry coke quenching reactor (5) is connected to by pipeline Dry gas mixing chamber (9), dry gas mixing chamber (9) connect with the air distribution plate (33) below porous metals band (31) in dry reactor It is logical；

(13) one output end of hot-blast stove is connected to cooled coal gas with greenhouse (14), and cooled coal gas is connected to pyrolysis reactor with greenhouse (14) (4) gas input, the gas output end of pyrolysis reactor (4) are connected with high-temperature gas-solid separation system (10) and tar in turn Recovery system (11), the waste pyrolysis gas containing tar gas enter tar recycling system in high-temperature gas-solid separation system (10) after dedusting Uniting, (11) are middle to trap tar.

3. a kind of sewage sludge gas heat carrier according to claim 2 is classified low temperature pyrogenation system, which is characterized in that the heat One output end of wind furnace (13) and the gas output end of coke tar recovery system (11) are connected to cooled coal gas with greenhouse (14), tar Recovery system (11) and cooled coal gas, which are matched, is connected with cooled coal gas blower (12) between greenhouse (14)；Cooled coal gas matches the output of greenhouse (14) End is connected to the gas input of pyrolysis reactor (4).

4. a kind of sewage sludge gas heat carrier according to claim 2 is classified low temperature pyrogenation system, which is characterized in that the water Dry quenching blower (7) is connected between cold dust arrester (6) and cooling de-watering device (8).

5. a kind of sewage sludge gas heat carrier according to claim 1 is classified low temperature pyrogenation system, which is characterized in that described more The reaction chamber of dry reactor (3) is stretched out in the starting point of mesoporous metal band (31).

6. a kind of sewage sludge gas heat carrier according to claim 2 is classified low temperature pyrogenation system, which is characterized in that hot-blast stove (13) heat source is natural gas or liquefied gas, the supplemental heat source cooled coal gas of hot-blast stove (13).