CN212408675U - Novel sludge drying and incinerating system - Google Patents
Novel sludge drying and incinerating system Download PDFInfo
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- CN212408675U CN212408675U CN202021232558.XU CN202021232558U CN212408675U CN 212408675 U CN212408675 U CN 212408675U CN 202021232558 U CN202021232558 U CN 202021232558U CN 212408675 U CN212408675 U CN 212408675U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model provides a novel sludge drying and incinerating system, which comprises a wet sludge bin, a rapid entrained flow bed sludge dryer, a primary breaking device, a secondary breaking device, an air chamber, a cyclone separator and a pulverized coal boiler, wherein a discharge port of the wet sludge bin is connected with a sludge feed port on the rapid entrained flow bed sludge dryer; the discharge hole of the rapid entrained flow sludge dryer is connected with the feed inlet of the cyclone separator; the dry sludge outlet of the cyclone separator is connected with the feed inlet of the pulverized coal boiler through a coal conveying system; the exhaust gas outlet of the cyclone separator is connected with a dust remover arranged in a flue of the pulverized coal boiler; a primary breaking-up crusher is arranged at the sludge feeding port; an air chamber is arranged at the bottom of the rapid entrained flow sludge dryer, and an air inlet on the air chamber is connected with a high-temperature flue gas outlet on a flue of the pulverized coal boiler; the bottom of the air chamber is provided with a secondary scattering crusher; the utility model solves the problems of complex system, large occupied area, large investment, high power consumption and high maintenance cost of the existing sludge drying system.
Description
Technical Field
The utility model relates to a coal fired boiler coupling living beings utilize environmental protection technical field, in particular to novel sludge drying burns system.
Background
Along with the development of society and the improvement of the living standard of people, the urban sewage treatment amount is increased day by day, and correspondingly, the generation amount of urban sludge which is a derivative of sewage treatment is increased day by day. The annual production of municipal sludge in the whole country in 2015 reaches 5000 ten thousand tons, and if industrial sludge is calculated, the total amount of the sludge reaches the level of municipal domestic waste. The reasonable and environment-friendly treatment demand of a large amount of municipal sludge is increasing day by day. In combination with the situation of China, the sludge treatment based on the incineration of the coal-fired unit is the most environment-friendly and effective treatment mode.
The harmless treatment modes of the sludge at the present stage are different according to the differences of various factors such as drying, drying degree, drying medium, contact mode and the like. For example, the circulating fluidized bed boiler can directly mix and burn a certain proportion of municipal sludge by virtue of the characteristic of wide fuel application range without drying treatment. Due to the particularity of a combustion system of the pulverized coal boiler with a larger storage amount, the sludge needs to be dried and ground into dry sludge with qualified particle size, and the dry sludge and the raw coal can be burnt together or independently. The sludge drying treatment mainly adopts flue gas or steam as a heat source to carry out drying in different degrees, and then the dried sludge is sent into a coal-fired boiler to be incinerated. Although the sludge drying and incinerating task can be well completed, the sludge drying system has the problems of complex system, large floor area, large investment, high power consumption, high maintenance cost and the like to different degrees, and the seeking of a more efficient and low-consumption sludge drying and incinerating device is urgent and is also an important supplement to the prior drying technical field.
The process has the advantages that research experiences of projects such as coal slime drying and lignite upgrading are combined, a rapid entrained flow bed device suitable for urban sludge crushing and drying is updated, the pneumatic separation technology is integrated in a rapid entrained flow bed dryer to realize crushing, drying and separation of sludge, different paths for feeding dry sludge and exhaust gas into a boiler to burn and treat are designed, and the process has positive effects on widening the sludge drying technology at the present stage and increasing industrial technology accumulation.
Disclosure of Invention
An object of the utility model is to provide a novel sludge drying burns system has solved the problem that the system that current sludge drying system exists is complicated, area is big, the investment is big, the power consumption is high, the maintenance cost is high.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a novel sludge drying and incinerating system, which comprises a wet sludge bin, a rapid entrained flow bed sludge dryer, a primary breaking device, a secondary breaking device, an air chamber, a cyclone separator and a pulverized coal boiler, wherein a discharge port of the wet sludge bin is connected with a sludge feed port on the rapid entrained flow bed sludge dryer; the discharge hole of the rapid entrained flow sludge dryer is connected with the feed inlet of the cyclone separator; the dry sludge outlet of the cyclone separator is connected with the feed inlet of the pulverized coal boiler through a coal conveying system; the exhaust gas outlet of the cyclone separator is connected with a dust remover arranged in a flue of the pulverized coal boiler;
a primary breaking-up crusher is arranged at the sludge feeding port;
an air chamber is arranged at the bottom of the rapid entrained flow sludge dryer, and an air inlet on the air chamber is connected with a high-temperature flue gas outlet on a flue of the pulverized coal boiler;
and a secondary scattering breaker is arranged at the bottom of the air chamber.
Preferably, the sludge feeding hole is provided with a plurality of sludge feeding holes; a plurality of sludge feed inlets are uniformly distributed along the circumferential direction of the cylinder of the rapid entrained flow sludge dryer; and a primary breaking-up crusher is arranged at the inlet of each sludge feeding hole.
Preferably, an anti-blocking grid is further arranged on an inner cavity of the rapid entrained flow sludge dryer, and the anti-blocking grid is arranged below the sludge feeding hole.
Preferably, an air distribution plate is arranged above the air chamber; the wind distribution plate is provided with a wind cap.
Preferably, a dry sludge discharge port of the cyclone separator is connected with a feed port of an air-closed discharger, and a discharge port of the air-closed discharger is connected with a feed port of a dry sludge bin; and the discharge hole of the dry sludge bin is connected with the feed inlet of the pulverized coal boiler through the coal conveying system.
Preferably, a sludge conveying belt is arranged between the discharge port of the dry sludge bin and the coal conveying system.
Preferably, the high-temperature flue gas outlet on the pulverized coal boiler flue is arranged above the air preheater, and the air preheater is arranged on the pulverized coal boiler flue.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a novel sludge drying incineration system, based on the sludge drying incineration system that the quick entrained flow bed found, combine the air separation technique, the crushing of the wet mud, mummification and sorting are realized in the quick entrained flow bed sludge drying machine of static no rotation comprehensively, have the multiple advantages such as the system is simple, take up an area of for a short time, the maintenance cost is low, the operation power consumption is low, the investment is little, retrieve soon, the dry mud of separation can directly go into the stove and burn, the exhaust is sent into the boiler afterbody rather than the furnace burns, reduced the energy consumption of unit operation; solves the problems of complex system, large occupied area, large investment, high power consumption and high maintenance cost of the existing sludge drying system.
Drawings
Fig. 1 is a schematic diagram of a system structure related to the present invention;
fig. 2 is a schematic structural view of the anti-blocking grill.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a novel sludge drying and incinerating system, which comprises a wet sludge bin 1, a screw conveyor 2, a fast entrained flow bed sludge dryer 3, a sludge feeding port 4, a primary scattering crusher 5, an anti-blocking grid 6, an air distribution plate 7, an air cap 8, a secondary scattering crusher 9, an air chamber 10, a cyclone separator 11, a dry sludge bin 12, an induced draft fan 14, an air preheater 15, a dust remover 16, a pulverized coal boiler 17 and an air-closed discharger 18, wherein a discharging port of the wet sludge bin 1 is connected with a feeding port of the screw conveyor 2; the discharge hole of the spiral conveyor 2 is connected with a sludge feed inlet 4 on the cylinder of the rapid entrained flow sludge dryer 3.
A plurality of sludge feed ports 4 are arranged; a plurality of sludge feeding holes are uniformly distributed along the circumferential direction of the cylinder body of the rapid entrained flow sludge dryer 3.
And a primary breaking-up crusher 5 is arranged at the inlet of each sludge feeding hole 4 and is used for primarily crushing wet sludge and avoiding affecting the drying efficiency when the wet sludge enters the drying machine in a blocky or massive form.
An anti-blocking grating 6 is further arranged on the inner cavity of the rapid entrained flow sludge dryer 3, and the anti-blocking grating 6 is arranged below the sludge feeding hole 4.
The bottom of the rapid entrained flow sludge dryer 3 is an air chamber 10, and an air distribution plate 7 is arranged above the air chamber 10.
And the air distribution plate 7 is provided with an air cap 8.
The air inlet of the air chamber 10 is connected with a flue of a pulverized coal boiler 17.
The bottom of the wind chamber 10 is provided with a secondary scattering breaker 9.
The dry sludge particle outlet of the rapid entrained flow sludge dryer 3 is connected with a cyclone separator 11.
The dry sludge discharge port of the cyclone separator 11 is connected with the feed port of the air-blocking discharger 18, and the discharge port of the air-blocking discharger 18 is connected with the feed port of the dry sludge bin 12.
And a waste gas outlet of the cyclone separator 11 is connected with an air inlet of an induced draft fan 14, and an air outlet of the induced draft fan 14 is connected with a dust remover 16 arranged in a flue of a pulverized coal boiler 17.
The utility model discloses a working process is:
the municipal sludge to be treated is intensively sent to a wet sludge bin 1 near a coal-fired unit for storage, and wet sludge discharged from the wet sludge bin 1 is transported to a rapid entrained flow sludge dryer 3 by a screw conveyor 2; according to the water content of the sludge to be treated, a corresponding wet sludge bin 1 can be constructed in a targeted manner, and a special screw conveyor 2 can be used, for example, a sludge screw pump is used for the fluid sludge with the water content of 80%, and an auger can be used for conveying the block sludge with the water content of 60%.
Wet sludge is fed into sludge feed ports 4 uniformly arranged on a cylinder of the rapid entrained flow sludge dryer 3, and the number of the sludge feed ports 4 is 2, 4 or more, and the design can be carried out by combining the sludge amount to be treated and the sludge property.
Wet sludge is primarily crushed by a primary scattering crusher 5 in the sludge feeding hole 4, so that the influence on drying efficiency caused by the fact that the wet sludge enters a drying machine in a block or lump form is avoided.
Meanwhile, an anti-blocking grating 6 is additionally arranged at a proper height in the dryer below the sludge feeding port 4, as shown in detail in fig. 2, the size of the grating meshes is optimally designed by combining the characteristics of sludge, for example, 150 x 150mm, a small number of large and wet sludge blocks which are not fully crushed are intercepted by the anti-blocking grating 6, and are dried and crushed into smaller particles to fall into the bottom through the drying of high-temperature flue gas and the collision of sludge particles from bottom to top.
An air chamber 10 is arranged at the bottom of the rapid entrained flow sludge dryer 3, and quantitative drying flue gas such as 340 ℃ is extracted from a flue above an air preheater 15 of a pulverized coal boiler 17 and sent into the air chamber 10 under the action of an induced draft fan; an air distribution plate 7 is arranged above the air chamber 10, wherein air caps 8 with a total design are uniformly arranged, and the dried flue gas flowing through the air chamber 10 is accelerated and then is sent into the dryer.
After the wet sludge is contacted with the high-temperature flue gas, the violent mass and heat transfer effects are generated: the average gas velocity of the section of the dryer depends on the smoke gas extraction amount, and directly corresponds to the critical diameter dc of wet sludge particles, the critical diameter is the diameter of the sludge particles when the gravity of the sludge particles is balanced with the drag force of airflow to the particles, the sludge can be in a suspension state due to the balance of the gravity and the drag force, but the sludge particles are weightless due to the heat transfer and mass transfer process, rise under the continuous action of the drag force and are taken out of the fast airflow bed sludge dryer 3 and separated by a gas-solid separation device, namely a cyclone separator 11, at the downstream, the wet sludge particles are continuously dried in the whole process, and the dry sludge particles with qualified water content, such as no more than 40%, are separated.
And for wet sludge particles with the diameter larger than the critical diameter, the particles fall under the action of gravity, and are split into smaller particle sizes under the combined action of collision with the sludge particles and a secondary scattering crusher 9 arranged at the bottom, and drying, rising and separation are completed, and large-particle sludge undergoes multiple collisions and crushing and can finally become dry sludge with expected water content.
The flue gas is mixed with dried and evaporated water vapor and sludge drying gas such as NH3 and H2S, which are collectively called exhaust gas. The dry sludge particles are entrained by the exhaust gas and are subjected to gas-solid separation in the cyclone separator 11, and the separated dry sludge particles enter the dry sludge bin 12 through the air-closed discharger 18 for temporary storage.
The dry sludge is discharged by a discharging device at the bottom, can be connected into a coal conveying system through a sludge conveying belt 13, is mixed with the fire coal, is ground by a coal mill and then is burnt in a furnace, and the dry sludge incinerator is suitable for the situation that a dry sludge bin is close to a coal conveying belt.
For the situation that the distance between the sludge and the air is far, the sludge is crushed and dried by the rapid entrained flow sludge drying machine 3 and is separated by the cyclone separator 11, the particle size of the sludge is small, the particle size of the separated dry sludge can meet the requirement of the particle size of pulverized coal burnt in a furnace by designing the air speed in the drying machine, and the part of the dry sludge can be directly burnt in the furnace by the sludge conveying belt 13 without causing serious influence on the burning system of the boiler.
The temperature of the exhaust gas discharged from the top of the cyclone separator 11 is 130-150 ℃, the pollutants contained in the exhaust gas are conventional smoke pollutants, low-temperature smoke drying cannot cause generation of dioxin precursors and dioxin, the exhaust gas can be directly connected into a front end flue of a dust remover 16 of a pulverized coal boiler 17 under the action of an induced draft fan 14, multiple treatment is carried out on the exhaust gas by using smoke pollutant removing devices of the boiler, such as a dust remover, a desulfurizing tower and the like, and standard emission is achieved.
The sludge drying and incinerating system constructed based on the rapid entrained flow combines the pneumatic separation technology, comprehensively realizes the crushing, drying and separation of wet sludge in the static non-rotating rapid entrained flow sludge dryer 3, has the multiple advantages of simple system, small occupied area, low maintenance cost, low running power consumption, small investment, quick recovery and the like, can directly burn the separated dry sludge in a furnace, and reduces the energy consumption of unit running by sending exhaust gas to the tail part of a boiler instead of a hearth.
Taking a 660MW unit of a certain power plant as an example, the 660MW unit utilizes a rapid entrained flow bed to carry out drying incineration on 240 tons/day of 60% wet sludge, the blending incineration proportion of the dried sludge is 2.6%, the coal consumption of the unit during operation is increased by-0.66 g/kWh, the influence on the thermal efficiency of a boiler is-0.12%, no water consumption exists, the indexes such as the operation power consumption and the like are lower than 70% of those of other drying incineration technologies under the same conditions, the advantages are obvious, and compared with the existing sludge drying incineration technology, the competitiveness is more prominent.
Claims (7)
1. A novel sludge drying and incinerating system is characterized by comprising a wet sludge bin (1), a rapid entrained-flow bed sludge dryer (3), a primary breaking-up crusher (5), a secondary breaking-up crusher (9), an air chamber (10), a cyclone separator (11) and a pulverized coal boiler (17), wherein a discharge hole of the wet sludge bin (1) is connected with a sludge feed hole (4) on the rapid entrained-flow bed sludge dryer (3); a discharge hole of the rapid entrained flow sludge dryer (3) is connected with a feed inlet of the cyclone separator (11); a dry sludge outlet of the cyclone separator (11) is connected with a feed inlet of a pulverized coal boiler (17) through a coal conveying system; the exhaust gas outlet of the cyclone separator (11) is connected with a dust remover (16) arranged in a flue of the pulverized coal boiler (17);
a primary breaking-up crusher (5) is arranged at the sludge feeding hole (4);
an air chamber (10) is arranged at the bottom of the rapid entrained flow sludge dryer (3), and an air inlet on the air chamber (10) is connected with a high-temperature flue gas outlet on a flue of a pulverized coal boiler (17);
the bottom of the air chamber (10) is provided with a secondary scattering breaker (9).
2. The novel sludge drying and incinerating system according to claim 1, wherein a plurality of sludge feeding ports (4) are provided; a plurality of sludge feed inlets are uniformly distributed along the circumferential direction of the cylinder of the rapid entrained flow sludge dryer (3); and a primary breaking-up crusher (5) is arranged at the inlet of each sludge feeding hole (4).
3. The novel sludge drying and incinerating system according to claim 1, wherein an anti-blocking grid (6) is further arranged on the inner cavity of the rapid entrained flow sludge dryer (3), and the anti-blocking grid (6) is arranged below the sludge feeding port (4).
4. The system for drying and incinerating sludge as claimed in claim 1, wherein an air distribution plate (7) is arranged above the air chamber (10); and the air distribution plate (7) is provided with an air cap (8).
5. The novel sludge drying and incinerating system according to claim 1, wherein the dry sludge discharge port of the cyclone separator (11) is connected with the feed port of the air-shut discharger (18), and the discharge port of the air-shut discharger (18) is connected with the feed port of the dry sludge bin (12); the discharge hole of the dry sludge bin (12) is connected with the feed inlet of the pulverized coal boiler (17) through a coal conveying system.
6. The novel sludge drying and incinerating system according to claim 5, wherein a sludge conveying belt (13) is arranged between the discharge port of the dry sludge bin (12) and the coal conveying system.
7. The novel sludge drying and incinerating system according to claim 1, wherein the high-temperature flue gas outlet in the flue of the pulverized coal boiler (17) is arranged above the air preheater (15), and the air preheater (15) is arranged in the flue of the pulverized coal boiler (17).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021232558.XU CN212408675U (en) | 2020-06-29 | 2020-06-29 | Novel sludge drying and incinerating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021232558.XU CN212408675U (en) | 2020-06-29 | 2020-06-29 | Novel sludge drying and incinerating system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649334A (en) * | 2020-06-29 | 2020-09-11 | 华能国际电力股份有限公司 | Novel sludge drying and incinerating system and method |
| CN115451421A (en) * | 2022-09-06 | 2022-12-09 | 山东大学 | Integrated process and equipment for conveying sludge or peat dried and crushed materials |
| CN117466516A (en) * | 2023-11-24 | 2024-01-30 | 河北长润环保科技有限公司 | Sludge drying coupling combustion system and process thereof |
-
2020
- 2020-06-29 CN CN202021232558.XU patent/CN212408675U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649334A (en) * | 2020-06-29 | 2020-09-11 | 华能国际电力股份有限公司 | Novel sludge drying and incinerating system and method |
| CN115451421A (en) * | 2022-09-06 | 2022-12-09 | 山东大学 | Integrated process and equipment for conveying sludge or peat dried and crushed materials |
| CN117466516A (en) * | 2023-11-24 | 2024-01-30 | 河北长润环保科技有限公司 | Sludge drying coupling combustion system and process thereof |
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