CN207391237U - Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove - Google Patents
Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove Download PDFInfo
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- CN207391237U CN207391237U CN201721214776.9U CN201721214776U CN207391237U CN 207391237 U CN207391237 U CN 207391237U CN 201721214776 U CN201721214776 U CN 201721214776U CN 207391237 U CN207391237 U CN 207391237U
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Abstract
The utility model discloses dioxin emission reducing device when a kind of cement kiln synergic processing sludge process and start and stop stove, which includes mud drying device, air accumulator, 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；Two-way is divided in the gas outlet of the first order cyclone cylinder of suspended preheater, wherein leading to mud drying device all the way, another way leads to waste heat boiler；Waste heat boiler is connected with raw mill；Raw mill is connected with kiln tail chimney；Mud drying device is connected with air accumulator；The gas outlet pipeline of air accumulator is divided into two-way, wherein first gas circuit leads to connection suspended preheater, Article 2 gas circuit leads to thermal decomposition furnace；Mud drying device bottom is connected with thermal decomposition furnace.The apparatus structure is compact, connection and reasonable arrangement, utilization rate of waste heat are high, the growing amount of dioxin during cement kiln normal operation and its start and stop stove is made drastically to reduce, it is ensured that dioxin qualified discharge.
Description
Technical field
The utility model is related to sludge synergistic disposal technologies, specifically, are related to a kind of cement kiln synergic processing sludge mistake
Dioxin emission reducing device when journey and start and stop stove.
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 generated, hinders and delay the development that national dioxin cuts down work.Therefore, environmental protection 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 adds dioxin
Year total emission volumn.Therefore, retarding dioxin generates during start and stop stove, could aid in the technologies such as " 3T+E ", activated carbon adsorption
It is common to realize dioxin qualified discharge.The Chinese patent of Application No. 201510729554.X：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 inhibit 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.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiency in the prior art, and a kind of structure design is provided and is closed
It manages, system perfecting, realizes the device of dioxin qualified discharge during cement kiln synergic processing sludge normal operation and start and stop stove
And control method.
The technical scheme in the invention for solving the above technical problem is：
A kind of dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove, it is characterised in that：Including
Mud drying device, air accumulator, suspended preheater, thermal decomposition furnace, rotary kiln, waste heat boiler, raw mill, kiln tail chimney；Revolution
Kiln is connected with thermal decomposition furnace；Thermal decomposition furnace is connected with suspended preheater；Outlet at the top of the first order cyclone cylinder of suspended preheater
Mouthful it is divided into two-way, wherein lead to the gas inlet of mud drying device upper side all the way, and leads on pipeline and be provided with the
One air-introduced machine, another way lead to waste heat boiler；Waste heat boiler is connected with raw mill；Raw mill is connected with kiln tail chimney, and raw material
Mill is disposed with cloth bag and the 3rd air-introduced machine with kiln tail chimney connector road；Raw meal inlet and raw material are provided on raw mill
The connecting tube of the first order cyclone cylinder and second level cyclone cylinder of connection suspended preheater is led in outlet, raw material outlet；Sludge drying
The desiccation gas outlet of bottom of device side is connected with the air inlet of air accumulator, and the outlet of desiccation gas and the air inlet of air accumulator
The second air-introduced machine, the first valve, first flowmeter are disposed on connecting line；The outlet tube road of air accumulator is set successively
The second valve, second flowmeter are put, and the gas outlet pipeline of air accumulator is divided into two gas circuits, wherein first gas circuit leads to company
The first order cyclone cylinder of suspended preheater and the connecting tube of second level cyclone cylinder are connect, and the 4th valve is provided in first article of gas circuit
Door, Article 2 gas circuit leads to thermal decomposition furnace, and the 3rd valve is provided in Article 2 gas circuit；The dry dirt of mud drying device bottom
Mud outlet is connected with thermal decomposition furnace.
Volume of gas storage tank described in the utility model is 50-100m3, normal temperature and pressure, bottom is equipped with ash bucket.
Suspended preheater described in the utility model uses Category Four cyclone cylinder pre-heating.
Two gas circuits that reservoir outlet described in the utility model is set, every gas circuit are only according to the operating condition of cement kiln
Vertical control.
The control method of dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove, feature exist
In：Under the action of the first air-introduced machine, the first order cyclone cylinder exiting flue gas of suspended preheater is pumped down to mud drying device work
For desiccation heat source；Wet mud in mud drying device becomes exhaust gas, desiccation gas, dewatered sludge after desiccation, and wherein desiccation gas exists
It is extracted and is temporarily stored in air accumulator under the action of second air-introduced machine, dewatered sludge is transported to thermal decomposition furnace and is fired as manufacture of cement
Material；When 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 outstanding
The first order cyclone cylinder region of floating preheater；When cement kiln start and stop stove, the second valve and the 3rd valve are opened, and the 4th valve closes
It closes, desiccation gas is passed through thermal decomposition furnace and acts on entire combustion rear region.
The first order cyclone cylinder exit gas temperature of suspended preheater described in the utility model is 300 °C or so.
Temperature in thermal decomposition furnace described in the utility model is 850-900 °C.
The desiccation gas and exhaust gas that wet mud in mud drying device described in the utility model generates after desiccation are again
The cement production system of natural alkalescence is returned, the concentration of emission of kiln exit gas pollutant is influenced smaller.
The dewatered sludge that wet mud in the utility model implementation mud drying device generates after desiccation is through overdrying
Sludge outlet is directly transported in thermal decomposition furnace, the fuel needed for replacing partial cement production.
The utility model compared with prior art, has the following advantages 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 reaches
Mark discharge；
（2）Dewatered sludge calorific value reaches 8-12MJ/kg, can be used as the fuel of manufacture of cement, energy saving；
（3）The bottom ash generated after dewatered sludge incineration disposal can save raw material as the raw material of manufacture of cement；
（4）Apparatus structure is compact, connection and reasonable arrangement, utilization rate of waste heat are high, effectively alleviates the tired of sewage sludge harmlessness disposing
Border.
Description of the drawings
Fig. 1 is the structure diagram of the utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawings and pass through embodiment the utility model is described in further detail, following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
Referring to Fig. 1, dioxin emission reducing when the utility model embodiment cement kiln synergic processing sludge process and start and stop stove
Device includes mud drying device 1, air accumulator 5, suspended preheater 15, thermal decomposition furnace 6, rotary kiln 7, waste heat boiler 8, raw mill
9th, 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 inlet 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
10 and the 3rd air-introduced machine 23 of cloth bag is disposed on connecting line.
Raw meal inlet and raw material outlet are provided on raw mill 9, the first of connection suspended preheater 15 is led in raw material outlet
The connecting tube of grade cyclone cylinder and second level cyclone cylinder.
The desiccation gas outlet 12 of 1 bottom side of mud drying device 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。
The outlet tube road of air accumulator 5 sets gradually the second valve 32, second flowmeter 42, 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 in first article of gas circuit, Article 2 gas circuit leads to thermal decomposition furnace 6, and second
The 3rd valve 33 is provided in article gas circuit.
The dewatered sludge outlet 13 of 1 bottom of mud drying device is connected with thermal decomposition furnace 6.
Mud drying device 1 uses the patent of invention of Application No. 201310405627.0 in the utility model embodiment：
Inhibit the sludge drying gas generating means of dioxin in flue gas, the desiccation gas which generates can effectively inhibit dioxin
Synthesis and discharge.
Suspended preheater 15 uses Category Four cyclone cylinder pre-heating in the utility model embodiment.
The volume of air accumulator 5 is 50-100m in the utility model embodiment3, normal temperature and pressure, bottom is equipped with ash bucket.
Two gas circuits that the outlet of air accumulator 5 is set in the utility model embodiment, every gas circuit is according to the operation of cement kiln
Operating mode independent control.
The control method of dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove includes following step
Suddenly：
（1）Under the action of the first air-introduced machine 21, the first order cyclone cylinder exiting flue gas of suspended preheater 15 is pumped down to dirt
Mud desiccation apparatus 1 is used as desiccation heat source；
（2）Wet mud in mud drying device 1 becomes exhaust gas, desiccation gas, dewatered sludge, wherein desiccation gas after desiccation
It is extracted and is temporarily stored in air accumulator 5 under the action of the second air-introduced machine 22, dewatered sludge is transported to thermal decomposition furnace 6 and is given birth to as cement
Produce fuel；
（3）When cement kiln normal operation, the second valve 32 and the 4th valve 34 are opened, and the 3rd valve 33 is closed, desiccation
Gas directly acts on the first order cyclone cylinder region of 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, desiccation gas
It is passed through thermal decomposition furnace 6 and acts on entire combustion rear region.
The first order cyclone cylinder exit gas temperature of suspended preheater 15 is 300 °C or so in the utility model embodiment.
Temperature in the utility model embodiment in thermal decomposition furnace 6 is 850-900 °C.
The desiccation gas and exhaust gas weight that wet mud in the utility model embodiment in mud drying device 1 generates after desiccation
The new cement production system for returning to natural alkalescence influences the concentration of emission of kiln exit gas pollutant smaller.
The dewatered sludge that wet mud in the utility model embodiment in mud drying device 1 generates after desiccation is dirty through overdrying
Mud outlet 13 is directly transported in thermal decomposition furnace 6, the fuel needed for replacing partial cement production.
According to now, some researches show that dioxin synthetic reaction occurs mainly in suspension in cement kiln synergic processing sludge process
The first order cyclone cylinder of preheater 15；The desiccation gas generated after sludge drying contains substantial amounts of SO2、NH3It is hindered with dioxin such as HCN
Stagnant gas body has been found have good inhibition to dioxin generation；Sludge drying gas is pointedly passed through cement kiln
The key area of dioxin generation that is, at the first order cyclone cylinder of suspended preheater 15, then contributes to reduction cement kiln 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 entire combustion rear region, helps to reduce the year total emission volumn of dioxin.This practicality is new
Technical solution described in type embodiment has fully ensured that cement kiln in normal course of operation, and especially cement kiln opens furnace shutting down process
In, the discharge capacity of dioxin is up to standard.
The professional technician that the following examples can make this professional is more fully understood the utility model, but not to appoint
Where formula limits the utility model.
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 dioxin in dioxin generation in garbage derivatived object incineration flue gas and raw material and kiln ash mixture
It makes and uses, 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 object incineration flue gas | 1.20 | - |
| 2 | Garbage derivatived object 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 utilized at the cement kiln of 5000 ton per day clinker production capacities
Life and industrial sludge are put, sludge drying is 600 ton per days using scale, and moisture percentage in sewage sludge is less than 30% after desiccation, main desiccation
Heat source is the waste heat flue gas of 280 DEG C of kiln tail.The system have stable, flow is simple, heat sources using fully, to shale
The advantages of adaptable and sludge alternative fuel effect is good.Through measuring and calculating, if the said firm using the utility model proposes technology
Cooperative disposal sludge, the desiccation gas generated disclosure satisfy that the emission reduction need of dioxin during cement kiln normal operation and start and stop stove
It asks.Therefore, existing equipment possess it is direct application the utility model proposes technology carry out system simple reformation possibility.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of parts and components is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and principles according to described in the utility model patent concept are done, are wrapped
It includes in the protection domain of the utility model patent.Those skilled in the art of the present invention can be to described
Specific embodiment does various modifications or additions or substitutes in a similar way, without departing from the knot of the utility model
Structure surmounts scope defined in the claims, all should belong to the protection range of the utility model.
Claims (3)
1. a kind of dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove, it is characterised in that：Including dirt
Mud desiccation apparatus, air accumulator, suspended preheater, thermal decomposition furnace, rotary kiln, waste heat boiler, raw mill, kiln tail chimney；Rotary kiln
It 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
It is divided into two-way, wherein leading to the gas inlet of mud drying device upper side all the way, and leads to and first is provided on pipeline
Air-introduced machine, another way lead to waste heat boiler；Waste heat boiler is connected with raw mill；Raw mill is connected with kiln tail chimney, and raw mill
Cloth bag and the 3rd air-introduced machine are disposed with kiln tail chimney connector road；Raw meal inlet is provided on raw mill and raw material go out
Mouthful, the connecting tube of the first order cyclone cylinder and second level cyclone cylinder of connection suspended preheater is led in raw material outlet；Sludge drying fills
The desiccation gas outlet for putting bottom side is connected with the air inlet of air accumulator, and the outlet of desiccation gas and the company of the air inlet of air accumulator
It takes over road and is disposed with the second air-introduced machine, the first valve, first flowmeter；The outlet tube road of air accumulator is set gradually
Second valve, second flowmeter, and the gas outlet pipeline of air accumulator is divided into two gas circuits, wherein first gas circuit leads to connection
The first order cyclone cylinder of suspended preheater and the connecting tube of second level cyclone cylinder, and the 4th valve is provided in first article of gas circuit,
Article 2 gas circuit leads to thermal decomposition furnace, and the 3rd valve is provided in Article 2 gas circuit；The dewatered sludge of mud drying device bottom
Outlet is connected with thermal decomposition furnace.
2. dioxin emission reducing device when cement kiln synergic processing sludge process according to claim 1 and start and stop stove,
It is characterized in that：The volume of gas storage tank is 50-100m3, bottom is equipped with ash bucket.
3. dioxin emission reducing device when cement kiln synergic processing sludge process according to claim 1 and start and stop stove,
It is characterized in that：The suspended preheater uses Category Four cyclone cylinder pre-heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721214776.9U CN207391237U (en) | 2017-09-21 | 2017-09-21 | Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721214776.9U CN207391237U (en) | 2017-09-21 | 2017-09-21 | Dioxin emission reducing device when cement kiln synergic processing sludge process and start and stop stove |
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| CN207391237U true CN207391237U (en) | 2018-05-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555755A (en) * | 2017-09-21 | 2018-01-09 | 中国联合工程公司 | The dioxin emission reducing device and control method of cement kiln synergic processing sludge |
| CN113474312A (en) * | 2019-07-05 | 2021-10-01 | 川崎重工业株式会社 | Sludge treatment method and cement production system |
-
2017
- 2017-09-21 CN CN201721214776.9U patent/CN207391237U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555755A (en) * | 2017-09-21 | 2018-01-09 | 中国联合工程公司 | The dioxin emission reducing device and control method of cement kiln synergic processing sludge |
| CN113474312A (en) * | 2019-07-05 | 2021-10-01 | 川崎重工业株式会社 | Sludge treatment method and cement production system |
| CN113474312B (en) * | 2019-07-05 | 2023-02-21 | 川崎重工业株式会社 | Sludge treatment method and cement production system |
| TWI826700B (en) * | 2019-07-05 | 2023-12-21 | 日商川崎重工業股份有限公司 | Sludge treatment method and cement manufacturing system |
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