CN202038959U - Boiler unit steam extraction sludge-drying system with heating power compensation - Google Patents
Boiler unit steam extraction sludge-drying system with heating power compensation Download PDFInfo
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- CN202038959U CN202038959U CN2011200696876U CN201120069687U CN202038959U CN 202038959 U CN202038959 U CN 202038959U CN 2011200696876 U CN2011200696876 U CN 2011200696876U CN 201120069687 U CN201120069687 U CN 201120069687U CN 202038959 U CN202038959 U CN 202038959U
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Abstract
The utility model provides a boiler unit steam extraction sludge-drying system with heating power compensation, which comprises a boiler flue, a boiler water supply pipeline and a unit steam extraction system. A deaerator and an economizer are arranged on the boiler water supply pipeline, the economizer serves as a heated surface and is located in the boiler flue, a steam inlet pipe of the deaerator is connected with the unit steam extraction system, and a water outlet pipe of the deaerator is connected with a water inlet pipe of the economizer. The system further comprises a sludge-drying device and an exhaust gas waste heat utilization device. The sludge-drying device is connected with the unit steam extraction system, and the exhaust gas waste heat utilization device comprises a heat absorbing section and a heat releasing section which are connected through a circulating pipeline. The heat absorbing section serves as a final-stage heated surface and is arranged in the boiler flue, and the heat releasing section is arranged on a water inlet pipe of the deaerator. The boiler unit steam extraction sludge-drying system with the heating power compensation dries the sludge by utilizing boiler unit steam and conducts the heating power compensation of the boiler system through an exhaust gas waste heat recycling device so as to improve utilization ratio of exhaust gas indirectly used for drying the sludge.
Description
Technical field
The utility model relates to a kind of dewatered sludge system, particularly a kind of utilize the boiler unit draw gas the dewatered sludge system.
Background technology
2009 annual China town sewage treatment capacities reach 28,000,000,000 tons, and wet mud (water ratio is 80%) generation is 2,005 ten thousand tons, amount to 5.5 ten thousand tons in the wet mud that produces water content 80% every day.Current is " Four Modernizations " principle for the processing of this part mud and the development foundation of disposal technology both at home and abroad---minimizing, stabilization, innoxious and resource utilization.Yet any method for sludge treatment all has strict requirement to the water ratio of mud; Generally through the moisture percentage in sewage sludge of water treatment plant's preliminary treatment about 80%, far do not reach the processing requirement of minimizing and resource utilization.Therefore the mummification of mud becomes the only way which must be passed that mud is further handled.
Mummification relies on heat to finish, and heat generally all is that energy burning produces.The form of utilizing of heat has two classes: 1, directly utilize; 2, indirect utilization.
No matter directly utilize or indirect utilization, owing to the source formation of its heat of economy reason all is single---the burning of coal fuel, boiler are the sources of the power of various device, and the maximum user of coal fuel is the potential supplier of dewatered sludge thermal source.Owing to contain the S element in the used fuel of boiler, make after burning and contain sour gas in the flue gas of boiler emission that their were understood and flow through each heating surface of boiler until being removed with the gasiform form in thionizer when cigarette temperature was high.When the cigarette temperature was lower than a certain temperature, they can be combined into sulfuric acid and corrode heat-exchange equipment with the water vapour in the flue gas.Low temperature corrosion appears in the low economizer of the cold junction of air preheater and feed temperature usually.When the temperature of heating surface was lower than the dew point of flue gas, the sulfuric acid that the sulphur trioxide that is generated behind water vapour in the flue gas and the coal combustion (the just seldom part of the fuel Products of sulphur) is combined into can condense on the heating surface heavy corrosion heating surface.For corrosion is revealed in the acid of avoiding heated surface at the end of boiler, usually the exhaust gas temperature design is higher, about 140 ℃ of new boilers, tend to up to 160 ℃ after operation for some time, the direct discharging of this part flue gas has caused very big energy dissipation, if can utilize this part thermal source to come dewatered sludge, its cost is undoubtedly economical.
Directly utilize: high-temperature flue gas is directly introduced moisture eliminator, carry out heat exchange by the contacting of gas and wet stock, convection current.The characteristics of this way are the efficient height of Btu utilization, if but had pollutent character by the material of mummification, also will bring emission problem, because of entering of high-temperature flue gas continues, therefore also cause equal flow, had the waste gas that directly contacts after special processing, to discharge with material, and the sour gas that may exist in the flue gas also has certain corrosive nature to mummification equipment, must influence the work-ing life of drying device.With the father-in-law of Zhejiang University shining newly be representative directly utilize flue gas dewatered sludge technology with this part flue gas and wet mud in the revolution drying kiln directly mixing contact dewatered sludge, its utilization efficiency of energy is higher undoubtedly, yet its shortcoming also is conspicuous as previously mentioned, there were a large amount of flue gases that directly contact after special processing, could discharge with material, and the sour gas that may exist in the flue gas also has certain corrosive nature to mummification equipment, influenced the work-ing life of drying device, and the grade of 140 ℃ of its energy of cigarette temperature is also lower, and mummification efficient is lower.
Indirect utilization: the heat of high-temperature flue gas is passed through heat exchanger, pass to certain medium, these media may be thermal oil, steam or air.Medium circulates in the loop of a sealing, and is not contacted by the material of mummification.Flue gas after heat is utilized by part normally discharges.There is certain thermosteresis in indirect utilization, but also faces following two problems:
The one, can corrode the equipment that contacts with flue gas because the cigarette temperature is low, how does the waste heat in this part flue gas go to reclaim?
The 2nd, to compare with the method for directly utilizing this part flue gas dewatered sludge, the heat energy grade of indirect utilization can be lower, and it is more difficult that dewatered sludge seems.
Yet use in the power plant of these boilers or power plant for self-supply of the large and medium-sized enterprise therrmodynamic system to improving the efficient of whole unit, be provided with multistage well heater on the general feedwater line before advancing economizer, the heating boiler feedwater, higher because of the feed pressure of heating, be referred to as high pressure heater; For some large medium-size boiler units, advancing on the preceding condensate line of deoxygenator (also being a well heater) itself also to be provided with multistage well heater, heat-setting water, for the pressure of feedwater, the pressure of condensed water is lower, is referred to as low pressure heater.Comprise that their used thermals source of deoxygenator and high-low pressure well heater are drawing gas of boiler unit (Steam Turbine), according to the difference of each unit, the steam parameter that draws gas also is not quite similar, and in general greater than 160 ℃, comes for big unit, and temperature can be higher.
The utility model content
Problem to be solved in the utility model provides a kind of boiler unit with thermal compensation dewatered sludge system of drawing gas, and overcomes the above-mentioned problems in the prior art.
The boiler unit of the band thermal compensation of the present utility model dewatered sludge system of drawing gas, comprise boiler flue, oiler feed pipeline and unit steam bleeding system, described oiler feed pipeline is provided with deoxygenator and economizer, described economizer is positioned at boiler flue as heating surface, the steam inlet pipe of described deoxygenator is connected with the unit steam bleeding system, the rising pipe of described deoxygenator links to each other with the water inlet pipe of economizer, also comprise sludge drying device and fume afterheat use device, the steam inlet pipe of sludge drying device links to each other with described unit steam bleeding system, the fume afterheat use device comprises endotherm section and the heat release section that links to each other by circulating line, endotherm section is located at the rear of final stage heating surface in the described boiler flue, and heat release section places on water inlet pipe one branch road of described deoxygenator.
Be provided with steam heater in the sludge drying device described in the utility model, the steam inlet pipe of steam heater links to each other with described unit steam bleeding system, and the steam outlet pipe of steam heater is connected with condensate tank.
Sludge drying system described in the utility model also comprises sludge bin and mud vapor-recovery system, and sludge bin links to each other with described sludge drying device, and the sludge drying device links to each other with the mud vapor-recovery system by circulating gas pipe.
Mud vapor-recovery system described in the utility model comprises condenser, recirculation blower and Sewage treatment systems, described condenser links to each other with the sludge drying device by described circulating gas pipe, recirculation blower is located on the circulating gas pipe, and the water port of condenser links to each other with Sewage treatment systems.
Be provided with spray header in the condenser described in the utility model, spray header links to each other with service pump.
The water inlet pipe of deoxygenator described in the utility model comprises two branch roads, is equipped with a flow control valve on every branch road, and described heat release section is positioned at wherein on the branch road
The utility model also comprises Controlling System and temperature sensor, and temperature sensor is located on the described endotherm section, and the steam inlet pipe of described steam heater is provided with flow control valve, and described temperature sensor, flow control valve all are connected with Controlling System.
The utility model also comprises a low pressure heater, and low pressure heater and described heat release section are located at respectively on two branch roads of described deoxygenator water inlet pipe, and the steam inlet pipe of low pressure heater links to each other with described unit steam bleeding system.
The steam inlet pipe of steam heater described in the utility model is connected with the steam inlet pipe of described low pressure heater.
The steam inlet pipe of steam heater described in the utility model is connected with the steam inlet pipe of described deoxygenator.
By above technical scheme, the boiler unit of the band thermal compensation of the present utility model dewatered sludge system of drawing gas, the part of boiler unit drawn gas heat mud and make its mummification, and avoiding flue gas acid to reveal under the corrosive situation, farthest the recovery boiler smoke discharging residual heat compensates the calorific loss that draws gas of dewatered sludge, make flue gas directly not contact the generation of avoiding harmful exhaust, and reduce the energy consumption of sludge drying, reduce sludge drying running cost with mud.
Description of drawings
Fig. 1 is a draw gas specific embodiment of dewatered sludge system of the utility model boiler unit.
Fig. 2 is draw gas another specific embodiment of dewatered sludge system of the utility model boiler unit.
Among the figure, 1, boiler flue; 2, economizer; 3, the sludge drying device; 4, endotherm section; 5, heat release section; 6, deoxygenator; 7, low pressure heater; 8,16,17, flow control valve; 9, sludge bin; 10, condensate tank; 11, condenser; 12, recirculation blower; 13, service pump; 14, Controlling System; 15, temperature sensor.
Embodiment
As shown in Figures 1 and 2, the boiler unit of the utility model band thermal compensation dewatered sludge system of drawing gas, comprise boiler flue 1, oiler feed pipeline and unit steam bleeding system, the oiler feed pipeline is provided with deoxygenator 6 and economizer 2, economizer is positioned at boiler flue 1 as heating surface, the steam inlet pipe of deoxygenator 6 is connected with the unit steam bleeding system, the rising pipe of deoxygenator links to each other with the water inlet pipe of economizer, also comprise sludge drying device 3 and fume afterheat use device, the steam inlet pipe of sludge drying device links to each other with the unit steam bleeding system, the fume afterheat use device comprises endotherm section 4 and the heat release section 5 that links to each other by circulating line, endotherm section 4 is located in the boiler flue as final stage heating surface, the water inlet pipe of deoxygenator is provided with two branch roads, and heat release section 5 is placed in one on the branch road.What the utility model adopted that the sludge drying device utilizes boiler unit steam bleeding system draws gas dewatered sludge, makes flue gas and mud noncontact, and makes full use of fume afterheat.But under the constant situation of the total amount of drawing gas, owing to utilized and partly drawn gas dewatered sludge, the amount of drawing gas that is used for the heating boiler feedwater reduces, and the hydro-thermal amount that enters economizer so can reduce, for remedying this part calorific loss, adopt thermal compensation to guarantee the thermodynamic equilibrium of boiler unit.
Thermal compensation mainly by the partial fume waste heat in the flue gas waste heat recovery use device absorption boiler exhaust gas, is returned in the mode of heating boiler supplementary feed or condensed water in the therrmodynamic system of former boiler unit.The funnel temperature of boiler is 140～160 ℃, the boiler feedwater or the condensing water temperature of heating are generally between 20～60 ℃, if flue gas is direct and its heat exchange, the heat exchanger wall surface temperature is near the flue gas acid dew point temperature, may cause the acid of heat-exchange equipment to reveal corrosion, for avoiding this problem, this flue gas waste heat recovery use device divides endotherm section and two parts of heat release section, endotherm section 4 places flue to absorb the heat transferred working medium, working medium passes to boiler feedwater or condensed water in heat release section 5 again, the working medium working mechanism is generally high temperature pump circulation water or natural circulation steam, therefore its heat transfer coefficient makes wall surface temperature be determined by working medium side temperature far above fume side.
Above-mentioned sludge drying system also comprises sludge bin 9, condensate tank 10 and mud vapor-recovery system, sludge bin 9 links to each other with sludge drying device 3, the steam outlet pipe of the steam heater in the sludge drying device links to each other with condensate tank 10, behind the steam dewatered sludge, self become condensed water and be stored in the condensate tank 10, this part condensed water can add in the deoxygenator or make other purposes.Sludge drying device 3 links to each other with the mud vapor-recovery system by circulating gas pipe.The mud vapor-recovery system comprises condenser 11, recirculation blower 12 and Sewage treatment systems, and condenser 11 links to each other with sludge drying device 3 by circulating gas pipe, and recirculation blower 12 is located on the circulating gas pipe, and the water port of condenser 11 links to each other with Sewage treatment systems.And being provided with spray header in the condenser 11, spray header links to each other with service pump 13.
The dewatered sludge of coming in from the water treatment plant, general water ratio is about 80%.Mud is stored in the sludge bin 9, is provided with push plate device in the sludge bin 9, by the operation of hydraulic pressure or electric device, prevents that the mud slag that hardens from influencing discharging.Sludge drying device 3 with the sludge water content evaporation, is taken out of the heat transferred mud of steam by recirculated air.Circulation entered sludge drying device 3 after the water vapor that recirculation blower 12 produces sludge drying device 3 in the mud vapor-recovery system and the gas of part fugitive constituent were extracted out and entered condenser 11 condensations by circulating gas pipe.Condenser 11 adopts the mode of jet condensation, water of condensation is from the pond, enter spray condenser through behind the service pump 14, fully contact with recirculated air by spray header atomizing back, discharge from condenser 11 tops after the air cooling, air cooling-down rear section steam coagulation becomes liquid water, discharges from condenser bottom discharge mouth with water of condensation, enters Sewage treatment systems and handles.The sludge drying device can be one or more levels according to the treatment capacity of mud, the mummification degree of mud, the temperature and the flow design of flue gas.
Because the part volatilization gas in the mud constantly enters in the recycle gas, the amount of recirculated air will constantly increase, on the recirculated air pipeline, installed vapor pipe, gas is incinerator near vapor pipe inserts, by burning the energy that reclaims volatile matter, and the elimination stench, or adopt other processing modes, reduce pollution to environment.
As a specific embodiment of the present utility model, as shown in Figure 1, the oiler feed pipeline is provided with deoxygenator 6 and economizer 2, economizer 2 links to each other by the rising pipe of water pump with deoxygenator 6, be provided with steam heater in the sludge drying device 3, the steam inlet pipe of steam heater is connected with the steam inlet pipe of deoxygenator 6, and the steam outlet pipe of steam heater links to each other with condensate tank.The water inlet pipe of deoxygenator is divided into two branch roads, and heat release section 5 is placed in one on the branch road.Oiler feed divides two-way to enter deoxygenator 6, leads up to enter deoxygenator 6 again after heat release section 5 is absorbed heat, and another road directly enters deoxygenator 6, and oiler feed is flowed out deoxygenator 6 and entered economizer 2 through water pumps.Be provided with flow control valve 17 on the heat release section water inlet pipe, be provided with flow control valve 8 on another branch road of deoxygenator water inlet pipe, to guarantee to enter the water yield size of deoxygenator constant by controlling these two flow control valves.
The utility model also comprises Controlling System 14, temperature sensor 15 and flow control valve 17,8, temperature sensor 15 links to each other with Controlling System with flow control valve, temperature sensor 15 is located on the endotherm section 4, and on the heat release section water inlet pipe, be provided with flow control valve 17, on another branch road of deoxygenator water inlet pipe, be provided with flow control valve 8, the steam inlet pipe of steam heater also is provided with flow control valve 16, controls the quantity of steam that enters the sludge drying device by regulating flow control valve 16.By the temperature sensor 15 and the flow control valve 7 that is installed on heat release section 5 suction culverts on the Controlling System 14 control flue gas waste heat recovery use device endotherm sections 4, this Controlling System can make it be higher than the flue gas acid dew point temperature all the time with the change regulated at will endotherm section wall temperature of boiler load, at utmost reclaims smoke discharging residual heat.
As another specific embodiment of the present utility model, as shown in Figure 2, on the oiler feed pipeline except that economizer and deoxygenator, also can be provided with low pressure heater 7, deoxygenator links to each other with boiler unit steam bleeding system respectively with low pressure heater, and low pressure heater 7 and heat release section 5 are located at respectively on two branch roads of deoxygenator water inlet pipe.Oiler feed one tunnel enters deoxygenator through low pressure heater, and one tunnel process heat release section enters deoxygenator.This moment, the steam inlet pipe of steam heater can be selected to link to each other with the steam inlet pipe of deoxygenator 6, also can select to link to each other with the steam inlet pipe of low pressure heater 7, and establish flow control valve 16 on the steam inlet pipe of steam heater.No matter the sludge drying device links to each other with deoxygenator or links to each other with low pressure heater, all is to utilize boiler to draw gas dewatered sludge.
Also comprise Controlling System 14, temperature sensor 15 and flow control valve 17,8, temperature sensor 15 links to each other with Controlling System with flow control valve, temperature sensor 15 is located on the endotherm section 4, and on the heat release section water inlet pipe, be provided with flow control valve 17, promptly be provided with at another branch road of deoxygenator water inlet pipe on the branch road of low pressure heater and be provided with flow control valve 8, the well heater steam inlet pipe of sludge drying device also is provided with flow control valve 16, controls the quantity of steam that enters the sludge drying device by regulating flow control valve 16.The utility model utilizes the heat of above-mentioned flue gas waste heat recovery to come heating boiler feedwater, draws gas dewatered sludge with what above-mentioned heating boiler fed water again, guarantees former therrmodynamic system balance, indirectly the boiler exhaust gas waste heat is used for dewatered sludge.
Claims (10)
1. the boiler unit with thermal compensation dewatered sludge system of drawing gas, comprise boiler flue (1), oiler feed pipeline and unit steam bleeding system, described oiler feed pipeline is provided with deoxygenator (6) and economizer (2), described economizer is positioned at boiler flue (1) as heating surface, the steam inlet pipe of described deoxygenator (6) is connected with the unit steam bleeding system, the rising pipe of described deoxygenator links to each other with the water inlet pipe of economizer, it is characterized in that, also comprise sludge drying device (3) and fume afterheat use device, the sludge drying device links to each other with described unit steam bleeding system, the fume afterheat use device comprises endotherm section (4) and the heat release section (5) that links to each other by circulating line, endotherm section (4) is located in the described boiler flue as final stage heating surface, and heat release section (5) places on the water inlet pipe of described deoxygenator.
2. the boiler unit according to claim 1 dewatered sludge system of drawing gas, it is characterized in that, be provided with steam heater in the described sludge drying device, the steam inlet pipe of steam heater links to each other with described unit steam bleeding system, and the steam outlet pipe of steam heater is connected with condensate tank (10).
3. the boiler unit according to claim 2 dewatered sludge system of drawing gas, it is characterized in that, described sludge drying system also comprises sludge bin (9) and mud vapor-recovery system, sludge bin (9) links to each other with described sludge drying device (3), and sludge drying device (3) links to each other with the mud vapor-recovery system by circulating gas pipe.
4. the boiler unit according to claim 3 dewatered sludge system of drawing gas, it is characterized in that, described mud vapor-recovery system comprises condenser (11), recirculation blower (12) and Sewage treatment systems, described condenser (11) links to each other with sludge drying device (3) by described circulating gas pipe, recirculation blower (12) is located on the circulating gas pipe, and the water port of condenser links to each other with Sewage treatment systems.
5. the boiler unit according to claim 4 dewatered sludge system of drawing gas is characterized in that described condenser is provided with spray header in (11), and spray header links to each other with service pump (13).
6. the boiler unit according to claim 2 dewatered sludge system of drawing gas, it is characterized in that, the water inlet pipe of described deoxygenator comprises two branch roads, is equipped with a flow control valve (8,17) on every branch road, and described heat release section (5) is positioned at wherein on the branch road.
7. the boiler unit according to claim 6 dewatered sludge system of drawing gas, it is characterized in that, also comprise Controlling System (14) and temperature sensor (15), temperature sensor (15) is located on the described endotherm section (4), the steam inlet pipe of described steam heater is provided with flow control valve (16), and described temperature sensor, flow control valve (8,16,17) all are connected with Controlling System.
8. the boiler unit according to claim 6 dewatered sludge system of drawing gas, it is characterized in that, also comprise a low pressure heater (7), low pressure heater (7) is located at respectively on two branch roads of described deoxygenator (6) water inlet pipe with described heat release section (5), and the steam inlet pipe of low pressure heater links to each other with described unit steam bleeding system.
9. the boiler unit according to claim 8 dewatered sludge system of drawing gas is characterized in that the steam inlet pipe of described steam heater is connected with the steam inlet pipe of described low pressure heater (7).
10. the boiler unit according to claim 2 dewatered sludge system of drawing gas is characterized in that the steam inlet pipe of described steam heater is connected with the steam inlet pipe of described deoxygenator (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200696876U CN202038959U (en) | 2011-03-16 | 2011-03-16 | Boiler unit steam extraction sludge-drying system with heating power compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200696876U CN202038959U (en) | 2011-03-16 | 2011-03-16 | Boiler unit steam extraction sludge-drying system with heating power compensation |
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| Publication Number | Publication Date |
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| CN202038959U true CN202038959U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200696876U Expired - Lifetime CN202038959U (en) | 2011-03-16 | 2011-03-16 | Boiler unit steam extraction sludge-drying system with heating power compensation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173555A (en) * | 2011-03-16 | 2011-09-07 | 上海伏波环保设备有限公司 | Boiler unit steam extraction and drying sludge system with thermal compensation |
-
2011
- 2011-03-16 CN CN2011200696876U patent/CN202038959U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173555A (en) * | 2011-03-16 | 2011-09-07 | 上海伏波环保设备有限公司 | Boiler unit steam extraction and drying sludge system with thermal compensation |
| CN102173555B (en) * | 2011-03-16 | 2012-07-04 | 上海伏波环保设备有限公司 | Boiler unit steam extraction and drying sludge system with thermal compensation |
| WO2012122841A1 (en) * | 2011-03-16 | 2012-09-20 | 上海伏波环保设备有限公司 | System for drying sludge by steam extracted from boiler set with thermal compensation |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111116 Effective date of abandoning: 20130227 |
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| RGAV | Abandon patent right to avoid regrant |