CN218154244U

CN218154244U - Sludge drying incineration and waste heat comprehensive utilization system

Info

Publication number: CN218154244U
Application number: CN202222070486.9U
Authority: CN
Inventors: 周国顺; 郭镇宁; 张琳; 胡利华
Original assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd; Everbright Environmental Protection Technology Equipment Changzhou Co Ltd
Current assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd; Everbright Environmental Protection Technology Equipment Changzhou Co Ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-12-27
Anticipated expiration: 2032-08-08

Abstract

The utility model discloses a sludge drying incineration and waste heat comprehensive utilization system, which generates electricity by using the heat of sludge incineration, and simultaneously adopts an electric energy driving filter press to pre-dehydrate sludge and remove most of water in a liquid state, thereby realizing energy conservation and environmental protection; the waste heat generated after the power generation of the steam turbine is fully utilized, the heat of the circulating cooling water is utilized by adopting a heat pump, the heat contained in the sludge is utilized to the maximum extent, and the purposes of saving energy and reducing consumption are achieved; the combination of drying, incineration and waste heat utilization has high thermal efficiency, so that the sludge can be maintained to be incinerated by self without adding energy from the outside, and the annual running time exceeds 8000h, and the smoke can reach the standard and be discharged; the water content of the sludge after filter pressing is about 50-60%, and water which can be removed in a liquid water form is removed to the maximum extent; the water content of the sludge after heat drying is lower than 20%, so that the heat value of the sludge is greatly improved; the temperature of the incinerator is controlled to be 850-900 ℃, and dioxin generated by incineration is effectively decomposed.

Description

Sludge drying incineration and waste heat comprehensive utilization system

Technical Field

The utility model belongs to the technical field of the sludge drying burns, concretely relates to sludge drying burns and waste heat comprehensive utilization system.

Background

With the continuous improvement of the national requirements for environmental protection, the treatment and disposal of sludge become a hot problem in the current society. The disposal mode of drying sludge and then burning sludge becomes the key point of attention of all parties. However, how to perform efficient drying incineration is one of the important problems to be studied.

The sludge can be reduced, harmlessly and resourcefully utilized to the maximum extent by incineration. But the calorific value is low due to high water content in the sludge, so that it needs to be subjected to dehydration treatment before incineration. Since the specific heat capacity of water in sludge is high and the latent heat of vaporization is large, it is necessary to consume a large amount of energy to remove the water in the sludge thermally. However, the filter pressing can only remove part of the external water in the sludge, and the requirement of incineration on the water content in the sludge cannot be met. Meanwhile, the existing circulating cooling water is directly discharged or cooled in an air cooling mode, so that a large amount of heat energy is wasted.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved is as follows: to the technical problem, the utility model provides a sludge drying burns and waste heat comprehensive utilization system burns the heat energy that produces with sludge incineration and is used for the electricity generation, and electric drive filter-press carries out the filter-pressing to mud, gets rid of the partial extra water wherein, reduces the energy that uses the heat drying to consume. And then, comprehensively utilizing the energy in the circulating cooling water in a heat pump mode, improving the grade of heat energy of the circulating cooling water, and carrying out heat drying on the residual sludge to achieve the water content required by incineration. The whole system can utilize the energy of the sludge to the maximum extent and save the disposal cost of the sludge.

The technical scheme is as follows: the utility model provides a sludge drying burns and waste heat comprehensive utilization system, includes wet mud storehouse, pressure filter, first conveyer, heat drying machine, second conveyer, burns burning furnace, exhaust-heat boiler, steam turbine, generator, condenser and heat pump, the sludge outlet in wet mud storehouse and the access connection of pressure filter, the sludge outlet of pressure filter is connected with the feed inlet of first conveyer, the discharge gate of first conveyer and the access connection of heat drying machine, the export of heat drying machine is connected with the feed inlet of second conveyer, the discharge gate of second conveyer and the access connection of burning furnace, the exhanst gas outlet of burning furnace and exhaust-heat boiler's flue gas access connection, exhaust-heat boiler's superheated steam outlet and the access connection of steam turbine, the steam turbine is connected with the generator, the generator is connected with the pressure filter, and for the pressure filter power supply, the exhaust steam outlet of steam turbine and the access connection of condenser, the heat energy of condenser gets into the heat drying machine through the heat pump.

The utility model provides a sludge drying burns and waste heat comprehensive utilization system, still includes gas cleaning system, gas cleaning system's flue gas inlet and exhaust-heat boiler's fume outlet are connected.

Preferably, the filter press is a plate and frame filter press.

Preferably, the wastewater produced by the filter press enters a sewage treatment station.

Preferably, the first conveyor and the second conveyor are both screw conveyors.

Preferably, the incinerator is a fluidized bed incinerator.

Preferably, the temperature of the incinerator is 850 to 900 ℃.

Has the advantages that: 1) The utility model generates power by the heat of sludge incineration, and simultaneously adopts the electric energy to drive the filter press to pre-dehydrate the sludge, remove most of water in a liquid state, thereby realizing energy conservation and environmental protection;

2) The waste heat generated after the power generation of the steam turbine is fully utilized, the heat of the circulating cooling water is utilized by adopting a heat pump, the heat contained in the sludge is utilized to the maximum extent, and the purposes of saving energy and reducing consumption are achieved;

3) The combination of drying, incineration and waste heat utilization has high thermal efficiency, so that the sludge can be maintained to be incinerated by self without adding energy from the outside, and the annual running time exceeds 8000h, and the smoke can reach the standard and be discharged;

4) The water content of the sludge after filter pressing is about 50-60%, and water which can be removed in a liquid water mode is removed to the maximum extent;

5) The water content of the sludge after heat drying is lower than 20 percent, and the heat value of the sludge is greatly improved;

6) The temperature of the incinerator is controlled to be 850-900 ℃, and dioxin generated by incineration is effectively decomposed.

Drawings

FIG. 1 is a schematic structural view of a sludge drying and incinerating and waste heat comprehensive utilization system of the present invention;

number in the figure: 1. the system comprises a wet sludge bin, 2, a filter press, 3, a first conveyor, 4, a heat dryer, 5, a second conveyor, 6, an incinerator, 7, a waste heat boiler, 8, a flue gas purification system, 9, a steam turbine, 10, a generator, 11, a condenser, 12 and a heat pump.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.

Example 1

Referring to fig. 1, a sludge drying incineration and waste heat comprehensive utilization system comprises a wet sludge bin 1, a filter press 2, a first conveyor 3, a heat dryer 4, a second conveyor 5, an incinerator 6, a waste heat boiler 7, a steam turbine 9, a generator 10, a condenser 11 and a heat pump 12, wherein a sludge outlet of the wet sludge bin 1 is connected with an inlet of the filter press 2, a sludge outlet of the filter press 2 is connected with a feed inlet of the first conveyor 3, a discharge outlet of the first conveyor 3 is connected with an inlet of the heat dryer 4, an outlet of the heat dryer 4 is connected with a feed inlet of the second conveyor 5, a discharge outlet of the second conveyor 5 is connected with an inlet of the incinerator 6, a flue gas outlet of the incinerator 6 is connected with a flue gas inlet of the waste heat boiler 7, an superheated steam outlet of the waste heat boiler 7 is connected with an inlet of the steam turbine 9, the steam turbine 9 is connected with the generator 10, the generator 10 is connected with the filter press 2 and supplies power to the filter press 2, an exhaust steam outlet of the steam turbine 9 is connected with an inlet of the condenser 11, and heat energy of the condenser 11 enters the heat dryer 4 through the heat pump 12.

The sludge drying incineration and waste heat comprehensive utilization system further comprises a flue gas purification system 8, and a flue gas inlet of the flue gas purification system 8 is connected with a flue gas outlet of the waste heat boiler 7.

The filter press 2 is a plate and frame filter press.

And (3) the wastewater generated by the filter press 2 enters a sewage treatment station.

The first conveyor 3 and the second conveyor 5 are both screw conveyors.

The incinerator 6 is a fluidized bed incinerator.

The temperature of the incinerator 6 is 850 to 900 ℃.

Wet sludge is injected into the plate-and-frame filter press from the wet sludge bin, deep filter pressing is carried out on the wet sludge through the plate-and-frame filter press, the water content of the sludge after filter pressing reaches about 50% -60%, moisture in the filter pressing process is removed in a liquid state, and wastewater is sent into a sewage disposal station for disposal and then is discharged. And (4) conveying the sludge subjected to filter pressing dehydration into a heat drying machine through a screw conveyor for heat drying. Drying the sludge to be below 20% of water content by a heat drying mode, feeding the dried sludge into an incinerator for incineration by a screw conveyor, controlling the incineration temperature in the incinerator to be 850-900 ℃, and completely decomposing dioxin generated in the incineration process while fully combusting and releasing heat of the sludge. The heat generated by incineration is absorbed by a waste heat boiler to generate superheated steam, and the steam works through a steam turbine to generate power. The electricity that the generator sent is used for driving plate and frame filter press to carry out the filter-pressing to wet mud. The exhaust steam is condensed by the circulating cooling water, so that the heat of the exhaust steam is transferred to the circulating cooling water. And extracting heat energy in the circulating cooling water through a heat pump, and drying the sludge through a heat drier after extraction.

The utility model discloses utilize the electricity that mud self burned and sent to carry out machinery before mud carries out the heat drying and just dewater, most water is with the form of liquid desorption, compares in the heat drying, has practiced thrift a large amount of energies to the mud calorific value has been solved with the unbalanced problem of dry heat. Therefore, the problem that auxiliary fuel is needed due to insufficient heat value of the sludge at present is fundamentally solved, the operation cost is greatly reduced, and the concept of energy conservation and environmental protection is embodied. And simultaneously, the utility model discloses make full use of the waste heat after the steam turbine electricity generation, the form that adopts the heat pump draws the heat of recirculated cooling water and carries out the heat drying to mud to the heat that can furthest's utilization sludge incineration produced does not outwards discharge the heat basically, has further embodied energy saving and consumption reduction's theory.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a sludge drying burns and waste heat comprehensive utilization system which characterized in that: comprises a wet sludge bin (1), a filter press (2), a first conveyor (3), a heat drier (4), a second conveyor (5), an incinerator (6), a waste heat boiler (7), a steam turbine (9), a generator (10), a condenser (11) and a heat pump (12), the sludge outlet of the wet sludge bin (1) is connected with the inlet of the filter press (2), the sludge outlet of the filter press (2) is connected with the feed inlet of the first conveyor (3), the discharge port of the first conveyor (3) is connected with the inlet of the heat drier (4), the outlet of the heat drier (4) is connected with the feed inlet of the second conveyor (5), the discharge outlet of the second conveyor (5) is connected with the inlet of the incinerator (6), the flue gas outlet of the incinerator (6) is connected with the flue gas inlet of the waste heat boiler (7), the superheated steam outlet of the waste heat boiler (7) is connected with the inlet of a steam turbine (9), the steam turbine (9) is connected with a generator (10), the generator (10) is connected with the filter press (2), and supplies power to the filter press (2), the exhaust steam outlet of the steam turbine (9) is connected with the inlet of the condenser (11), and the heat energy of the condenser (11) enters the heat drier (4) through the heat pump (12).

2. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: the waste heat boiler is characterized by further comprising a flue gas purification system (8), wherein a flue gas inlet of the flue gas purification system (8) is connected with a flue gas outlet of the waste heat boiler (7).

3. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: the filter press (2) is a plate and frame filter press.

4. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: and wastewater generated by the filter press (2) enters a sewage treatment station.

5. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: the first conveyor (3) and the second conveyor (5) are both screw conveyors.

6. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: the incinerator (6) is a fluidized bed incinerator.

7. The system for sludge drying incineration and waste heat comprehensive utilization according to claim 1, characterized in that: the temperature of the incinerator (6) is 850 to 900 ℃.