CN107555755A - The dioxin emission reducing device and control method of cement kiln synergic processing sludge - Google Patents
The dioxin emission reducing device and control method of cement kiln synergic processing sludge Download PDFInfo
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- CN107555755A CN107555755A CN201710859268.4A CN201710859268A CN107555755A CN 107555755 A CN107555755 A CN 107555755A CN 201710859268 A CN201710859268 A CN 201710859268A CN 107555755 A CN107555755 A CN 107555755A
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Abstract
The present invention relates to sludge synergistic disposal technology, the dioxin emission reducing device and control method of a kind of cement kiln synergic processing sludge are disclosed.The device mainly includes mud drying device, air accumulator, suspended preheater, thermal decomposition furnace, rotary kiln, waste heat boiler, raw mill, kiln tail chimney.When control method includes the operation of cement kiln nominal situation and dioxin emission reducing control during start and stop stove.By using the device and control method, it can effectively suppress the growing amount of dioxin during cement kiln normal operation and its start and stop stove, it is ensured that dioxin qualified discharge；In addition, the apparatus structure is compact, connection and reasonable arrangement, utilization rate of waste heat are high, the predicament of sewage sludge harmlessness disposing is effectively alleviated.
Description
Technical field
The present invention relates to sludge synergistic disposal technology, specifically, is related to a kind of two evils of cement kiln synergic processing sludge
English emission reduction device and control method.
Background technology
According to statistics, cement kiln synergic processing domestic sewage sludge in China's accounts for 10% or so of sludge total amount, effectively alleviates
Sludge treatment problem.But manufacture of cement industry is the key industry of dioxin, cement kiln synergic processing sludge may
Dioxin increment is produced, hinders and delay the development that national dioxin cuts down work.Therefore, environmental administration puts into effect《Water
Stall cooperative disposal solid waste pollution controls standard》Emission limit is allowed to be set as 0.1 ng I- the highest of dioxin
TEQ/Nm3。
Under the premise of stable combustion condition, the complete and reasonable operation of flue gas purification system, most cement kiln dioxin
Discharge can meet the emission limit of national regulation.But temperature is too low during start and stop stove can cause cement kiln dioxin to be arranged
Zoom level sharply increases, and this point is also confirmed in hazardous waste and domestic waste incineration operation.In addition, start and stop stove
The abnormal emission of operating mode dioxin has " memory effect ", not only influences follow-up operating mode qualified discharge, and add dioxin
Year total emission volumn.Therefore, retarding dioxin generates during start and stop stove, could aid in the technologies such as " 3T+E ", charcoal absorption
Dioxin qualified discharge is realized jointly.Application No. 201510729554.X Chinese patent：It is a kind of using quality coal in cement kiln systems
The anhydration system of the aqueous rubbish of waste heat desiccation, the anhydration system realize the disposal to the aqueous rubbish such as domestic sewage sludge, but
It is not design relevant apparatus to suppress the generation of dioxin during sludge treatment and during start and stop stove.
In summary, dioxin when one kind can effectively control cement kiln synergic processing sludge process and start and stop stove is found to give birth to
Into the device and method with discharge capacity, realize that dioxin qualified discharge seems necessary.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and offer is a kind of reasonable in design,
System perfecting, realize the device of dioxin qualified discharge and control during cement kiln synergic processing sludge normal operation and start and stop stove
Method processed.
Technical scheme is used by the present invention solves the above problems：
A kind of dioxin emission reducing device of cement kiln synergic processing sludge, it is characterised in that：Including mud drying device, gas storage
Tank, suspended preheater, thermal decomposition furnace, rotary kiln, waste heat boiler, raw mill, kiln tail chimney；Rotary kiln is connected with thermal decomposition furnace；
Thermal decomposition furnace is connected with suspended preheater；Gas outlet at the top of the first order cyclone cylinder of suspended preheater is divided into two-way, wherein one
The gas approach of mud drying device upper side is led on road, and leads on pipeline and be provided with the first air-introduced machine, and another way is led to
To waste heat boiler；Waste heat boiler is connected with raw mill；Raw mill is connected with kiln tail chimney, and raw mill and kiln tail chimney connector
Cloth bag and the 3rd air-introduced machine are disposed with road；Raw meal inlet and raw material outlet are provided with raw mill, raw material outlet is led to
Connect the first order cyclone cylinder of suspended preheater and the connecting tube of second level cyclone cylinder；The desiccation of mud drying device bottom side
Gas outlet is connected with the air inlet of air accumulator, and the outlet of desiccation gas on the connecting line of the air inlet of air accumulator with setting gradually
There are the second air-introduced machine, the first valve, first flowmeter；The second valve, second are set gradually on the gas outlet pipeline of air accumulator
Gauge, and the gas outlet pipeline of air accumulator is divided into two gas circuits, wherein first article of gas circuit leads to the of connection suspended preheater
The connecting tube of one cyclonic cylinder and second level cyclone cylinder, and the 4th valve is provided with first article of gas circuit, Article 2 gas circuit is led to
Thermal decomposition furnace, and the 3rd valve is provided with Article 2 gas circuit；The dewatered sludge outlet of mud drying device bottom and thermal decomposition furnace
Connection.
Volume of gas storage tank of the present invention is 50-100m3, normal temperature and pressure, bottom is equipped with ash bucket.
Suspended preheater of the present invention uses Category Four cyclone cylinder pre-heating.
Two gas circuits that reservoir outlet of the present invention is set, every gas circuit are independently controlled according to the operating condition of cement kiln
System.
Suppress the control method of dioxin generation during start and stop stove in cement kiln synergic processing device of sludge, it is characterised in that：
In the presence of the first air-introduced machine, the first order cyclone cylinder exiting flue gas of suspended preheater is pumped down to mud drying device as dry
Change thermal source；Wet mud in mud drying device becomes waste gas, desiccation gas, dewatered sludge, wherein desiccation gas is second after desiccation
It is extracted and is temporarily stored in air accumulator in the presence of air-introduced machine, dewatered sludge is transported to thermal decomposition furnace as manufacture of cement fuel；When
During cement kiln normal operation, the second valve and the 4th valve are opened, and the 3rd valve is closed, and desiccation gas directly acts on suspension preheating
The first order cyclone cylinder region of device；When cement kiln start and stop stove, the second valve and the 3rd valve are opened, and the 4th valve is closed, and are done
Change gas is passed through thermal decomposition furnace and acts on whole combustion rear region.
The first order cyclone cylinder exit gas temperature of suspended preheater of the present invention is 300 °C or so.
Temperature in thermal decomposition furnace of the present invention is 850-900 °C.
Wet mud in mud drying device of the present invention caused desiccation gas and waste gas after desiccation return to
The cement production system of natural alkalescence, the concentration of emission of kiln exit gas pollutant is influenceed smaller.
Wet mud in the mud drying device of the present invention caused dewatered sludge after desiccation exports by dewatered sludge
Directly it is transported in thermal decomposition furnace, the fuel needed for replacing partial cement production.
The present invention compared with prior art, has advantages below and effect：
（1）The growing amount of dioxin is drastically reduced during cement kiln normal operation and its start and stop stove, it is ensured that dioxin row up to standard
Put；
（2）Dewatered sludge calorific value reaches 8-12MJ/kg, can be used as the fuel of manufacture of cement, saves the energy；
（3）Caused bottom ash can save raw material as the raw material of manufacture of cement after dewatered sludge incineration disposal；
（4）Apparatus structure is compact, connection and reasonable arrangement, utilization rate of waste heat are high, effectively alleviates the predicament of sewage sludge harmlessness disposing.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Referring to Fig. 1, the embodiment of the present invention suppresses the cement kiln synergic processing device of sludge bag of dioxin generation during start and stop stove
Include mud drying device 1, air accumulator 5, suspended preheater 15, thermal decomposition furnace 6, rotary kiln 7, waste heat boiler 8, raw mill 9, kiln tail
Chimney 14.
Rotary kiln 7 is connected with thermal decomposition furnace 6, and thermal decomposition furnace 6 is connected with suspended preheater 15.
Gas outlet at the top of the first order cyclone cylinder of suspended preheater 15 is divided into two-way, wherein leading to sludge drying dress all the way
The gas approach 11 of 1 upper side is put, and leads on pipeline and is provided with the first air-introduced machine 21, another way leads to waste heat boiler 8.
Waste heat boiler 8 is connected with raw mill 9, and raw mill 9 is connected with kiln tail chimney 14, and raw mill 9 and kiln tail chimney 14
The air-introduced machine 23 of cloth bag 10 and the 3rd is disposed with connecting line.
Raw meal inlet and raw material outlet are provided with raw mill 9, the first of connection suspended preheater 15 is led in raw material outlet
The connecting tube of level cyclone cylinder and second level cyclone cylinder.
The desiccation gas outlet 12 of the bottom side of mud drying device 1 is connected with the air inlet of air accumulator 5, and desiccation gas goes out
Mouth 12 on the connecting line of the air inlet of air accumulator 5 with being disposed with the second air-introduced machine 22, the first valve 31, first flowmeter
41。
Set gradually the second valve 32, second flowmeter 42 on the gas outlet pipeline of air accumulator 5, and air accumulator 5 goes out
Gas port pipeline is divided into two gas circuits, wherein first gas circuit leads to first order cyclone cylinder and the second level of connection suspended preheater 15
The connecting tube of cyclone cylinder, and the 4th valve 34 is provided with first article of gas circuit, Article 2 gas circuit leads to thermal decomposition furnace 6, and second
The 3rd valve 33 is provided with article gas circuit.
The dewatered sludge outlet 13 of the bottom of mud drying device 1 is connected with thermal decomposition furnace 6.
Mud drying device 1 uses the patent of invention of Application No. 201310405627.0 in the embodiment of the present invention：Suppress
The sludge drying gas generating means of dioxin in flue gas, desiccation gas caused by the device can effectively suppress the synthesis of dioxin
And discharge.
Suspended preheater 15 uses Category Four cyclone cylinder pre-heating in the embodiment of the present invention.
The volume of air accumulator 5 is 50-100m in the embodiment of the present invention3, normal temperature and pressure, bottom is equipped with ash bucket.
Two gas circuits that the outlet of air accumulator 5 is set in the embodiment of the present invention, every gas circuit is according to the operating condition of cement kiln
Independent control.
The control method of dioxin generation comprises the following steps when suppressing start and stop stove in cement kiln synergic processing device of sludge：
（1）In the presence of the first air-introduced machine 21, the first order cyclone cylinder exiting flue gas of suspended preheater 15 is pumped down to sludge and done
Makeup puts 1 and is used as desiccation thermal source；
（2）Wet mud in mud drying device 1 becomes waste gas, desiccation gas, dewatered sludge, wherein desiccation gas is after desiccation
It is extracted and is temporarily stored in air accumulator 5 in the presence of two air-introduced machines 22, dewatered sludge is transported to thermal decomposition furnace 6 and fired as manufacture of cement
Material；
（3）When cement kiln normal operation, the second valve 32 and the 4th valve 34 are opened, and the 3rd valve 33 is closed, and desiccation gas is straight
Connect the first order cyclone cylinder region for acting on suspended preheater 15；
（4）When cement kiln start and stop stove, the second valve 32 and the 3rd valve 33 are opened, and the 4th valve 34 is closed, and desiccation gas is passed through
Thermal decomposition furnace 6 acts on whole combustion rear region.
The first order cyclone cylinder exit gas temperature of suspended preheater 15 is 300 °C or so in the embodiment of the present invention.
Temperature in the embodiment of the present invention in thermal decomposition furnace 6 is 850-900 °C.
Wet mud in the embodiment of the present invention in mud drying device 1 caused desiccation gas and waste gas after desiccation return again
The cement production system for right alkalescence of saving the situation, the concentration of emission of kiln exit gas pollutant is influenceed smaller.
Wet mud in the embodiment of the present invention in the mud drying device 1 caused dewatered sludge after desiccation goes out by dewatered sludge
Mouth 13 is directly transported in thermal decomposition furnace 6, the fuel needed for replacing partial cement production.
According to now, there are some researches show dioxin synthetic reaction occurs mainly in suspension in cement kiln synergic processing sludge process
The first order cyclone cylinder of preheater 15；Caused desiccation gas contains substantial amounts of SO after sludge drying2、NH3Hindered with dioxin such as HCN
Stagnant gas body, have been found that there is good inhibition to dioxin generation；Sludge drying gas is pointedly passed through cement kiln
The key area of dioxin generation, i.e., at the first order cyclone cylinder of suspended preheater 15, then reduction cement kiln is contributed to normally to transport
The discharge capacity of dioxin during row；Cement kiln can not provide enough residual heat to dry sludge during start and stop stove and prepare desiccation
Gas, therefore desiccation gas is kept in using air accumulator 5, the desiccation gas of deposit is opened into furnace shutting down process applied to cement kiln, in start and stop stove
Desiccation gas is passed through thermal decomposition furnace 6 and acts on whole combustion rear region, helps to reduce the year total emission volumn of dioxin.It is of the invention real
Apply the technical scheme described in example and fully ensure that cement kiln in normal course of operation, especially during cement kiln start and stop stove,
The discharge capacity of dioxin is up to standard.
The present invention is more fully understood in the professional and technical personnel that the following examples can make this professional, but not with any side
The formula limitation present invention.
Experiment condition：Laboratory is using the first order cyclone cylinder operating condition of vertical heater simulation suspended preheater, research dirt
The suppression that mud desiccation gas generates to dioxin in dioxin generation in garbage derivatived thing incineration flue gas and raw material and kiln ash mixture
Make and use, wherein flue gas flow is 1L/min, and desiccation gas concentration is 1000ppm, flue gas flow rate 7m/s, and the reaction time is
30min, it is as shown in the table：
| Sequence number | Reactant | PCDD/Fs concentration in flue gas（ng I-TEQ/Nm3） | Inhibiting rate（%） |
| 1 | Garbage derivatived thing incineration flue gas | 1.20 | - |
| 2 | Garbage derivatived thing incineration flue gas+desiccation gas | 0.14 | 88.3 |
| 3 | Raw material and kiln ash mixture | 0.79 | - |
| 4 | Raw material and kiln ash mixture+desiccation gas | 0.15 | 81.0 |
Through consulting related data, Gaungzhou Yuebao Cement Co., Ltd. is given birth to using the cement kiln disposal of 5000 ton per day clinker production capacities
Living and industrial sludge, sludge drying are 600 ton per days using scale, and moisture percentage in sewage sludge is less than 30% after desiccation, main desiccation thermal source
For 280 DEG C of waste heat flue gas of kiln tail, the system has that stable, flow is simple, heat sources are using fully, adapt to shale
Property strong and sludge alternative fuel effect it is good the advantages of.Through measuring and calculating, if the said firm is disposed using technology synergy proposed by the present invention
Sludge, its caused desiccation gas disclosure satisfy that the emission reduction demand of dioxin during cement kiln normal operation and start and stop stove.Therefore,
Existing equipment possesses the direct possibility that system simple reformation is carried out using technology proposed by the present invention.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (5)
- A kind of 1. dioxin emission reducing device of cement kiln synergic processing sludge, it is characterised in that：Including mud drying device, gas storage Tank, suspended preheater, thermal decomposition furnace, rotary kiln, waste heat boiler, raw mill, kiln tail chimney；Rotary kiln is connected with thermal decomposition furnace； Thermal decomposition furnace is connected with suspended preheater；Gas outlet at the top of the first order cyclone cylinder of suspended preheater is divided into two-way, wherein one The gas approach of mud drying device upper side is led on road, and leads on pipeline and be provided with the first air-introduced machine, and another way is led to To waste heat boiler；Waste heat boiler is connected with raw mill；Raw mill is connected with kiln tail chimney, and raw mill and kiln tail chimney connector Cloth bag and the 3rd air-introduced machine are disposed with road；Raw meal inlet and raw material outlet are provided with raw mill, raw material outlet is led to Connect the first order cyclone cylinder of suspended preheater and the connecting tube of second level cyclone cylinder；The desiccation of mud drying device bottom side Gas outlet is connected with the air inlet of air accumulator, and the outlet of desiccation gas on the connecting line of the air inlet of air accumulator with setting gradually There are the second air-introduced machine, the first valve, first flowmeter；The second valve, second are set gradually on the gas outlet pipeline of air accumulator Gauge, and the gas outlet pipeline of air accumulator is divided into two gas circuits, wherein first article of gas circuit leads to the of connection suspended preheater The connecting tube of one cyclonic cylinder and second level cyclone cylinder, and the 4th valve is provided with first article of gas circuit, Article 2 gas circuit is led to Thermal decomposition furnace, and the 3rd valve is provided with Article 2 gas circuit；The dewatered sludge outlet of mud drying device bottom and thermal decomposition furnace Connection.
- 2. the dioxin emission reducing device of cement kiln synergic processing sludge according to claim 1, it is characterised in that：Described Volume of gas storage tank is 50-100m3, normal temperature and pressure, bottom is equipped with ash bucket.
- 3. the dioxin emission reducing device of cement kiln synergic processing sludge according to claim 1, it is characterised in that：Described Suspended preheater uses Category Four cyclone cylinder pre-heating.
- A kind of 4. dioxin of cement kiln synergic processing sludge as described in any one claim in claims 1 to 3 The control method of emission reduction device, it is characterised in that：In the presence of the first air-introduced machine, the first order cyclone cylinder of suspended preheater goes out Mouth flue gas is pumped down to mud drying device as desiccation thermal source；Wet mud in mud drying device after desiccation, become waste gas, Desiccation gas, dewatered sludge, wherein desiccation gas are extracted and are temporarily stored in air accumulator in the presence of the second air-introduced machine, and dewatered sludge is transported To thermal decomposition furnace as manufacture of cement fuel；When cement kiln normal operation, the second valve and the 4th valve are opened, the 3rd valve Door is closed, and desiccation gas directly acts on the first order cyclone cylinder region of suspended preheater；When cement kiln start and stop stove, the second valve Opened with the 3rd valve, the 4th valve is closed, and desiccation gas is passed through thermal decomposition furnace and acts on whole combustion rear region.
- 5. control method according to claim 4, it is characterised in that：Temperature in described thermal decomposition furnace is 850-900 ° C。
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| CN201710859268.4A CN107555755A (en) | 2017-09-21 | 2017-09-21 | The dioxin emission reducing device and control method of cement kiln synergic processing sludge |
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| CN201710859268.4A CN107555755A (en) | 2017-09-21 | 2017-09-21 | The dioxin emission reducing device and control method of cement kiln synergic processing sludge |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607043A (en) * | 2012-04-09 | 2012-07-25 | 浙江大学 | Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression |
| CN105276589A (en) * | 2015-11-02 | 2016-01-27 | 北京建筑材料科学研究总院有限公司 | Drying system for drying water-containing garbage by utilizing waste heat of cement kiln system |
| CN207391237U (en) * | 2017-09-21 | 2018-05-22 | 中国联合工程有限公司 | Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove |
-
2017
- 2017-09-21 CN CN201710859268.4A patent/CN107555755A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607043A (en) * | 2012-04-09 | 2012-07-25 | 浙江大学 | Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression |
| CN105276589A (en) * | 2015-11-02 | 2016-01-27 | 北京建筑材料科学研究总院有限公司 | Drying system for drying water-containing garbage by utilizing waste heat of cement kiln system |
| CN207391237U (en) * | 2017-09-21 | 2018-05-22 | 中国联合工程有限公司 | Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove |
Non-Patent Citations (2)
| Title |
|---|
| 付建英;詹明秀;陈彤;李晓东;: "水泥窑协同处置固废烟气中二恶英排放研究综述" * |
| 冯立斌,张衍国,吴占松,郭亮: "城市生活垃圾焚烧中的气体污染与防治" * |
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Address after: The city of Hangzhou city of Zhejiang Province, 310022 Stonebridge Road No. 338 Applicant after: United Engineers Ltd in China Address before: The city of Hangzhou city of Zhejiang Province, 310022 Stonebridge Road No. 338 Applicant before: China Lianhe Engineering Co., Ltd., China |