CN1315988C - Waste plastic processing method for increasing coke strength and its apparatus system - Google Patents
Waste plastic processing method for increasing coke strength and its apparatus system Download PDFInfo
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- CN1315988C CN1315988C CNB031499651A CN03149965A CN1315988C CN 1315988 C CN1315988 C CN 1315988C CN B031499651 A CNB031499651 A CN B031499651A CN 03149965 A CN03149965 A CN 03149965A CN 1315988 C CN1315988 C CN 1315988C
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Abstract
The present invention discloses a waste plastic processing method for increasing the intensity of coke, and a device system thereof, which relates to a waste plastic processing technology and a device thereof. The waste plastic processing method is characterized in that waste plastic is processed with a hot melt method; the processed waste plastic is jointly coked with coking mixing coal according to a certain mixture ratio. Thereby, the goal of improving the quality of coke is achieved. The system of the present invention is composed of a waste plastic feeding device, a waste plastic pulverizing device, a mutual fluxing agent preheating device, a waste plastic hot-melting device, a hot-melt object conveying device and a device for mixing hot-melt objects and coking mixing coal. The present invention has the advantages that by hot-melt processing for waste plastic, complicated processing processes, such as plastic extruding and forming processes, granulating processes, etc., can not be adopted; the processing technology is simple; the technical problems that waste plastic can not be uniformly mixed and liquated with coal, etc. are effectively solved; the use amount of additive agents is reduced or eliminated; the effect of obviously improving the quality of coke by using the waste plastic or the additive agents is achieved. Thereby, the processing cost and the operating cost of the waste plastic are largely reduced.
Description
Technical field
The invention belongs to plastic waste and coal cocoaking process field, relate to the plastic waste processing technology and utilize plastic waste to improve the method and system of metallurgical coke intensity, especially relate to the plastic waste working method and the system that improve coke strenth.
Technical background
Along with the fast development of world economy and science and technology, the raising day by day of people's living standard, the continuous quickening of urbanization process, the output of municipal solid wastes sharply increases.According to statistics, the annual production of the present domestic waste of China has surpassed 1.5 hundred million tons, and annual just with 8%～10% speed increment.The city of China nearly 2/3 is among the rubbish encirclement.Plastic waste in China's domestic waste accounts for 4%～10% of rubbish total amount, and annual production reaches 500～6,000,000 tons, and annual just with nearly 8%～9% speed increment.
At present, China's garbage treatment disposal technology accounts for 79.2% of total treatment capacity still based on sanitary landfill and air storage, and next adopts compost treatment, accounts for 18.8% of total treatment capacity, adopts incineration technology on a small quantity, accounts for 2% of total treatment capacity.The recycling amount of China's plastic waste only accounts for 10%, and about 90% plastic waste is by landfill and burning.Therefore, how to realize plastic waste recycling and harmless treatment, become the focus of world attention problem.
Utilize coke oven treatment of waste plastics technology to have less investment, treatment scale is big, and 100% realizes the recycling of plastic waste and produces advantage such as secondary pollution hardly, is able to extensive concern in the world, and is successfully applied to production practice.In the technology of utilizing the coking process treatment of waste plastics, need to consider the problem of two aspects, the one, plastic waste processing, plastic waste and coal uniform mixing problem, the 2nd, the problem that influences of plastic waste STRENGTH ON COKE intensity.Utilize in the technology of coke oven treatment of waste plastics existing, the processing treatment of plastic waste adopts fragmentation, extrusion molding, moulding and process for granulating mostly, exists tooling cost higher, and processing power is lower, and coke strenth such as does not increase at problem.
Japanese Patent (patent No.: P6-228565) propose that plastic waste is processed into that particle mixes with coal or with the moulded coal mixed coking, cause plastic waste complete processing complexity, tooling cost height, and influence problem such as coke strenth.
(patent No.: P2001-49261A) propose apparent density is the plastic waste extrusion moulding of 0.40～0.95kg/L to Japanese Patent, and make the particle of 5-80mm, be mixed into stove coking with ratio and coal less than 5%, the plastic waste working method cost height that this technology proposes, and strict to plastic waste, practicality is relatively poor.
Japanese Patent (the patent No.: P2001-11468A) propose a kind of plastic waste working method that does not reduce coke strenth, this method is that plastic waste is divided into particulate (less than 6mm) and coarse grain (greater than 6mm), and with in the particulate plastic waste adding lumped coal, to carry out destructive distillation in the coarse grain plastic waste adding powdery coal, this method complex process, cost is higher, and only can keep coke strenth not reduce.
Japanese Patent (the patent No.: P2001-240868A) propose the burnt coking process of a kind of blast furnace.This method is that the body that at first plastic waste contracted is solidified into block, and then fills up agent to prevent the coke quality deterioration in plastic waste surface coverage one deck cohesiveness.This technology exists tooling cost higher equally, can't improve problems such as coke quality.
Japanese Patent (the patent No.: P2001-187406) propose the method that the common plastic waste rubbish of a kind of usefulness is made the coke oven raw material.This method is processed into block coke oven raw material through 7 procedures with plastic waste, and technology is very numerous and diverse, and investment and running cost are very high, and therefore, practicality is restricted.
Japanese Patent (the patent No.: P9-241654) propose a kind of Treatment of Waste Plastics method.This method is on traditional coal humidifying technology basis, at first coal being dried to moisture is in the 2-6% scope, again plastic waste is added in the moisture-free coal, in order to prevent the plastic waste fusion bonding, require service temperature to be controlled at below the plastic waste fusing point (140 ℃), and require regularly the drying plant inwall to be cleared up, this method is not mentioned the raising coke strenth.
(number of patent application: 02149021.X 02285830.X) proposes a kind of method and system of utilizing plastic waste to improve metallurgical coke intensity to Chinese patent.This method is that plastic waste is carried out mixing with additive coal system pitch after simple crushing is handled, allocate coking coal again into and carry out coking, reach the purpose that improves metallurgical coke intensity, but this technology can't solve coal and the isolating technical problem of plastic waste segregation, exist additives ratio too high simultaneously, the problem that causes cost to increase.
Summary of the invention
At defective such as existingly both at home and abroad utilize that ubiquity plastic waste complete processing relative complex in the coke oven treatment of waste plastics patented technology, plastic waste working ability are lower, segregation easily takes place for plastic waste and coal and coke strenth fails to be improved.The object of the present invention is to provide a kind of technology simple, can treatment of waste plastics, can improve the plastic waste working method and the system of coke strenth simultaneously again.The ultimate principle of this method and system is: utilize heat energy and mechanical stirring, the fusion that the realizes plastic waste body that contracts, and make plastic waste evenly melt the formation film attached to pre-hot coal surface, realize plastic waste and coal tight bond and plastic waste uniform distribution in coke making and coal blending.In coking, the volatile matter that produces attached to the waste plastics film decomposes on coal grain surface comparatively disperses and is evenly distributed, and effectively suppresses the generation of coke macroscopic void and big crackle, thereby improves coke strenth.Service temperature is controlled at the plastic waste heat fusing and does not take place in the pyrolysated scope, coal and plastic waste carry out of short duration mixing after the preheating, utilize the transmission of heat by contact and the mechanical stirring of storeroom to mix, plastic waste fusion and attached to pre-hot coal surface, avoid the fusion plastic waste to be bonded in the drying machine inwall, drying machine does not need periodic cleaning.Mixture after heat fusing is handled mixes (belt mixing) again with additive granules, the fusion of additive direct heat is advanced in the mixture of congruent melting agent and plastic waste composition, helps the dispersion and the parcel of plastic waste and additive more, thereby improves coke strenth.This method and system has the following advantages:
(1) plastic waste processing is very simple with mixing system, and processing power is big,
(2) plastic waste do not need to classify, the complicated courses of processing such as extrusion moulding and granulation, processing cost is lower, reduces investment outlay and working cost.
(3) plastic waste and coal mix, and segregation does not take place and separate, and can improve coke strenth
(4) production of equipment is relative with use ripe in each system, helps this skilled industry application, and drives the fast development of relevant device manufacturing.
Above-mentioned purpose and task are to be achieved through the following technical solutions: a kind of plastic waste working method that improves coke strenth, and step is: 1. the plastic waste that sorts out from domestic refuse, at first carry out break process; 2. with the congruent melting agent preheating, congruent melting agent is coal dust or coke powder, and preheating temperature is 150-220 ℃; 3. the plastic waste after the break process is joined and carry out heat fusing in the congruent melting agent after the preheating and handle, the ratio that plastic waste accounts for congruent melting agent is not more than 25%; 4. the mixture after heat fusing being handled mixes with coke making and coal blending, and the proportional range that plastic waste accounts for coke making and coal blending is 1-2%.
A kind of plastic waste system of processing that improves coke strenth is characterized in that: described congruent melting agent adds primary heater unit through metering device and carries out thermal pretreatment, and the congruent melting agent after the thermal pretreatment adds heat fusing device altogether by the insulation chute; Plastic waste carries out break process through shredder assembly, plastic waste after the fragmentation adds plastic waste to being total to the heat fusing device equably through the dosing bucket, congruent melting agent is mixing in the heat fusing device altogether after plastic waste and the preheating, mixture after heat fusing is handled altogether enters the 1# conveyor, is transferred to coke-oven plant's coal blending master conveyor (2# conveyor) at 1# conveyor front end by metering device adding additive and mixes as the coking raw material with coke making and coal blending.
Description of drawings
Be illustrated in figure 1 as a kind of plastic waste working method of coke strenth and process flow sheet of system of improving involved in the present invention.
Wherein: 1. congruent melting agent metering device; 2. congruent melting agent primary heater unit; 3. chute; 4. be total to the heat fusing device; 5. the special-purpose shredder assembly of plastic waste; 6. plastic waste dosing bucket; 7.1# conveyor; 8.2# conveyor, 9. additive metering device.
Embodiment
A kind of plastic waste working method that improves coke strenth involved in the present invention, implementation step comprises: the plastic waste that (1) at first will sort out from domestic refuse carries out break process; (2) with the congruent melting agent preheating; (3) plastic waste after the break process is added by a certain percentage carry out heat fusing in the congruent melting agent after the preheating and handle; (4) mixture after the heat fusing processing is mixed according to a certain ratio with coke making and coal blending, perhaps allocate a small amount of additive into.Described plastic waste comprises the plastic waste of any kind of, reluctant mixed waste plastic in the domestic waste especially, and plastic waste particle size after cracking scope is between 5mm to 50mm; Described congruent melting agent comprises the coal dust and the coke powder of any kind of, and additive comprises the coal-tar pitch and the petroleum pitch of any kind of; The congruent melting agent preheating temperature is controlled at 150-220 ℃, and the ratio that plastic waste accounts for congruent melting agent is not more than 25%, and the mixing time scope of congruent melting agent is 1-3min after plastic waste and the preheating, and the proportional range that plastic waste accounts for coke making and coal blending is 1-2%; Also can allocate the additive of 1-2% into, to significantly improve coke strenth.
The device systems that the enforcement that the present invention relates to improves the plastic waste working method of coke strenth is described below in conjunction with Fig. 1: congruent melting agent adds primary heater unit 2 through metering device 1 and carries out thermal pretreatment, and the congruent melting agent after the thermal pretreatment adds heat fusing device 4 altogether by insulation chute 3; Plastic waste carries out break process through shredder assembly 5, plastic waste after the fragmentation adds plastic waste to being total to heat fusing device 4 equably through dosing bucket 6, congruent melting agent is mixing in the heat fusing device 4 altogether after plastic waste and the preheating, mixture after altogether heat fusing is handled enters 1# conveyor 7, adds additives at 1# conveyor front end by metering device 9 and is transferred to coke-oven plant's coal blending master conveyor (2# conveyor) 8 and mixes as the coking raw material with coke making and coal blending.
The equipment connection situation of total system is described below: the discharge port of metering device 1 links to each other with the feeding end of congruent melting agent primary heater unit 2, the discharge port of congruent melting agent primary heater unit 2 is connected with the feeding mouth of chute 3, and the discharge port of chute 3 feeding mouth of heat fusing device 4 together connects; The discharge port of plastic waste shredder assembly 5 is connected with the inlet of dosing bucket 6, and the discharge port of dosing bucket 6 another feeding mouth of heat fusing device 4 together connects; The discharge port of heat fusing device 4 is connected by the feeding end of chute with 1# conveyor 7 altogether, and the discharge port of additive metering device 9 is located at 1# conveyor front end, and the discharge end of 1# conveyor 6 is connected with coal blending master belt 8.
Specific embodiment: test with the 200kg testing coke oven, the specification of testing coke oven is: the effectively long 800mm of body of heater, and effective high 900mm, width are 450mm, and coal capacity 230kg (dry coal), coking time are 18 hours, and the charge of coke core temperature is greater than 950 ℃.The raw material that the present embodiment adopts comprises coke making and coal blending (BC), plastic waste (MP) and coal system pitch; Plastic waste is by above-mentioned processes, at first plastic waste is broken into fragment less than 10mm, then a certain amount of coal is preheating to 190 ℃, again the plastic waste fragment is mixed stirring with pre-hot coal, the heat fusing time is 2min altogether, take out mixture and mix or add a certain amount of coal system pitch, be mixed with 200kg coke oven test raw material with a certain amount of coke making and coal blending.The coke that the test of 200kg coking by coke oven is produced carries out size analysis and drum test, tests its shatter strength (M40) and abrasive wear resistance (M10), carries out carbon dioxide reaction (CRI) test and post-reaction strength (CSR) test of coke.The relevant material proportion in back and to test the coke strenth test result as shown in table 1.
Table one: different schemes gained coke strenth index
| Pre-hot coal (kg) | Coal-tar pitch (kg) | Plastic waste (kg) | Coking coal (kg) | M 40 (％) | M 10 (％) | CRI (％) | CSR (％) | |
| Comparative example | 0 | 0 | 0 | 230 | 73.6 | 9.6 | 29.3 | 52.6 |
| Embodiment 1 | 9.2 | 0 | 2.3 | 218.5 | 75.6 | 8.8 | 29.7 | 55.8 |
| Embodiment 2 | 18.4 | 0 | 4.6 | 207 | 72.4 | 9.4 | 29.3 | 55.9 |
| Embodiment 3 | 9.2 | 2.3 | 2.3 | 216.2 | 76.8 | 8.0 | 28.2 | 62.0 |
| Embodiment 4 | 18.4 | 2.3 | 4.6 | 204.7 | 76 | 8.4 | 29.1 | 58.3 |
| Embodiment 5 | 9.2 | 4.6 | 2.3 | 213.9 | 74.4 | 8.6 | 27.9 | 60.7 |
Institute's column data is compared with comparative example (not adding pitch and plastic waste) scheme as can be seen from table 1, and the intensity index of embodiment gained coke is all at (indivedual indexs are suitable with comparative example), the wherein M of embodiment 3 gained coke of being improved in varying degrees
40Increase by 3.2 and 9.4 respectively, M with CSR
10Reduce by 1.6 and 1.1 respectively with CRI.
The foregoing description explanation: (1) adopts described plastic waste working method and system can suitably improve coke quality under the prerequisite of not adding any additives, and the proportioning of plastic waste can reach 2%; (2) adopt described plastic waste system of processing, the coal system pitch of interpolation 1% and 1% plastic waste can significantly improve coke quality.
Claims (9)
1. plastic waste working method that improves coke strenth, it is characterized in that: performing step comprises: the plastic waste that (1) sorts out from domestic refuse, at first carry out break process; (2) with the congruent melting agent preheating, congruent melting agent is coal dust or coke powder, and preheating temperature is 150-220 ℃; (3) plastic waste after the break process is joined carry out heat fusing in the congruent melting agent after the preheating and handle, the ratio that plastic waste accounts for congruent melting agent is not more than 25%; (4) mixture after the heat fusing processing is mixed with coke making and coal blending, the proportional range that plastic waste accounts for coke making and coal blending is 1-2%.
2. according to the described a kind of plastic waste working method that improves coke strenth of claim 1, it is characterized in that: described plastic waste particle size after cracking scope is between 5mm to 50mm.
3. according to the described a kind of plastic waste working method that improves coke strenth of claim 1, it is characterized in that: allocate the additive of 1-2% into, additive comprises coal-tar pitch and petroleum pitch.
4. device systems of implementing the described plastic waste working method of claim 1, it is characterized in that: the discharge port of metering device (1) links to each other with the feeding end of congruent melting agent primary heater unit (2), the discharge port of congruent melting agent primary heater unit (2) is connected with the feeding mouth of chute (3), and the discharge port of chute (a 3) feeding mouth of heat fusing device (4) together connects; The discharge port of plastic waste shredder assembly (5) is connected with the inlet of metering device (6), and the discharge port of dosing bucket (6) another feeding mouth of heat fusing device (4) together connects; The discharge port of heat fusing device (4) is connected by the feeding end of chute with 1# conveyor (7) altogether, and the discharge port of additive metering device (9) is located at 1# conveyor front end, and the discharge end of 1# conveyor (6) is connected with coal blending master belt (8).
5. according to the described a kind of device systems of implementing to improve the plastic waste working method of coke strenth of claim 4, it is characterized in that: described congruent melting agent primary heater unit (2) is selected roller dryer or fluidized drying equipment or vacuum dryer or net belt type drying or garden pan dryer for use according to the processing power size.
6. according to the described a kind of device systems of implementing to improve the plastic waste working method of coke strenth of claim 4, it is characterized in that: described plastic waste and congruent melting agent heat fusing device (4) are altogether selected common mixing equipment for use, comprise rake formula mixer or rotaring tube mode mixer or stirring-type mixer.
7. according to the described a kind of device systems of implementing to improve the plastic waste working method of coke strenth of claim 4, it is characterized in that: described plastic waste shredder assembly (5) is selected the common plastics crusher for use.
8. according to the described a kind of device systems of implementing to improve the plastic waste working method of coke strenth of claim 4, it is characterized in that: described plastic waste metering device (6) is selected screw feeder or star-shaped feeding machine for use.
9. according to the described a kind of device systems of implementing to improve the plastic waste working method of coke strenth of claim 4, it is characterized in that: the plastic waste after heat fusing is handled mixes the back and advances into coal conveyer belt at coal pulverizer fully with a small amount of additive, and enters simultaneously with coke making and coal blending and to be equipped with the coal pulverizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031499651A CN1315988C (en) | 2003-08-01 | 2003-08-01 | Waste plastic processing method for increasing coke strength and its apparatus system |
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| CNB031499651A CN1315988C (en) | 2003-08-01 | 2003-08-01 | Waste plastic processing method for increasing coke strength and its apparatus system |
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| CN1315988C true CN1315988C (en) | 2007-05-16 |
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| CN110819364B (en) * | 2019-10-30 | 2021-10-22 | 鞍钢股份有限公司 | Method for preparing metallurgical coke |
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|---|---|---|---|---|
| JPH039989A (en) * | 1989-06-06 | 1991-01-17 | Nkk Corp | Production of coke |
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