CN218480619U

CN218480619U - Sludge drying and incineration cooperative disposal system for waste incineration plant

Info

Publication number: CN218480619U
Application number: CN202222608210.1U
Authority: CN
Inventors: 杨洁; 鲁润润; 郭镇宁; 胡利华; 刘永付; 崔洁; 韩兆玉
Original assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen 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
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-02-14
Anticipated expiration: 2032-09-30

Abstract

The utility model provides a sludge drying of msw incineration factory burns deals with system in coordination belongs to sludge treatment technical field. The utility model discloses a water tank, first water pump, steam generator, sludge drying machine, steam pocket, downcomer, water-cooling wall, over heater, economizer, turbo generator group, condenser, oxygen-eliminating device, second water pump, water tank, first water pump, steam generator, sludge drying machine connect gradually, steam generator, over heater, turbo generator group, condenser, oxygen-eliminating device, second water pump, economizer and steam pocket connect gradually, the steam pocket is connected with steam generator. The utility model provides a waste incineration factory sludge drying burns in coordination with processing system can provide stable steam volume for the sludge drying machine, keeps sludge drying system steady operation.

Description

Sludge drying and incineration cooperative disposal system for waste incineration plant

Technical Field

The utility model belongs to the technical field of sludge treatment, concretely relates to waste incineration plant sludge drying burns deals with system in coordination.

Background

Municipal sludge is one of the most important derivatives in the domestic sewage treatment process, along with the development of the economic society, the environmental awareness of people is continuously improved, and the realization of stabilization, reduction, harmless and resource treatment and disposal of the municipal sludge becomes a hot research problem. At present, municipal sludge treatment ways in China include sludge agriculture, sludge landfill, sludge incineration, sludge marine treatment and the like. The sludge incineration is the best mode for sludge reduction, the volume reduction can reach more than 90%, however, municipal sludge has high water content and low heat value, and the direct incineration does not have economy. The process of sludge drying and dewatering is a process with high energy consumption and can generate additional pollutants, and even if the water content of the municipal sludge is reduced to 50%, the municipal sludge has a lower calorific value and does not have the value of independent incineration, so that the municipal sludge incineration disposal is generally coupled with an incineration power plant, and the sludge drying heat comes from the waste heat or electric energy of the power plant.

For the cooperative incineration of the sludge and the household garbage, in order to not influence the stability of an incineration process, the sludge needs to be dried before entering a furnace, and the sludge drying mode generally comprises a direct drying process, an indirect drying process and a combined drying process, wherein the direct drying utilizes waste heat boiler flue gas of an incineration plant on a heat source, and as the flue gas quantity required by the direct drying process of the flue gas is large, the requirements of the flue gas on conveying equipment and pipelines are high, and the high temperature of the flue gas also enables more VOCs to be generated in the sludge in the drying process, so that the environment of a plant area is severe; the combined drying process is a combination of the two processes, and although the application effect is due to the direct drying process, the equipment investment is large, the system is complex, and the application in engineering is relatively less. The indirect drying process utilizes waste heat steam of a waste incineration plant, and the steam has large heat capacity, is clean and convenient to convey. In terms of safety, the temperature of sludge particles is about 105 ℃ during indirect drying, steam with high heat capacity is used as a heat medium in the indirect drying process, and compared with a direct drying process, the indirect drying process is low in smoke temperature during operation, less in odor emission and friendly to the environment of a plant area. After comprehensively considering energy consumption, environment, investment and operation, the indirect drying process is the drying process most suitable for coupling treatment of municipal sludge in a waste incineration power plant.

The patent application with the patent number of CN112520974A discloses a low-temperature drying treatment system for coupling sludge in a waste incineration plant, which comprises a waste incineration power generation system, a belt type drying machine, a first-class absorption heat pump, a circulating fan and a sludge conveyor, and is characterized in that a steam machine is used for extracting steam at low pressure to drive the first-class absorption heat pump, so that heat in the process of condensing and dehumidifying the sludge is recovered while low-temperature drying of the sludge is realized, and the dried sludge is conveyed to an incinerator for synergetic incineration. However, the indirect drying of sludge by using steam extracted by a steam turbine to exchange heat through the system is caused by the situations of insufficient steam intake, unstable or even insufficient steam extraction in two-furnace one-machine projects, which results in the unstable operation of the sludge drying system.

SUMMERY OF THE UTILITY MODEL

To the technical problem mentioned above, the utility model provides a waste incineration plant sludge drying burns cooperative processing system that can provide stable steam volume, guarantee mummification system steady operation.

In order to achieve the purpose of the utility model, the technical proposal of the utility model is as follows:

the utility model provides a waste incineration factory sludge drying burns in coordination with processing system which characterized in that: the system comprises a water tank, a first water pump, a steam generator, a sludge drier, a steam pocket, a downcomer, a water wall, a superheater, an economizer, a turbo generator set, a condenser, a deaerator and a second water pump, wherein a water outlet of the water tank is connected with the first water pump, the first water pump is connected with a water inlet of the steam generator, a steam outlet of the steam generator is connected with a steam inlet of the sludge drier, and a water outlet of the sludge drier is connected with the water tank; the steam generator is further connected with the superheater, the turbine generator set, the condenser, the deaerator, the second water pump, the economizer and the steam drum are sequentially connected, and a steam outlet of the steam drum is connected with a steam inlet of the steam generator.

Furthermore, the steam generator and the steam drum are jointly connected with the downcomer, the downcomer is connected with the water-cooled wall, and the water-cooled wall is connected to the steam drum.

Furthermore, a steam outlet of the sludge drier is connected with a condenser.

Further, the steam generator can be arranged inside the steam drum.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

through setting up steam generator to and utilize the saturated steam that produces in the steam pocket to heat for the inside water of steam generator and produce superheated steam, then utilize the superheated steam that steam generator produced to carry out the mummification to the inside wet sludge of sludge drying machine, can provide stable steam volume for sludge drying machine, keep sludge drying system steady operation.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

fig. 2 is a schematic flow diagram of the steam generator of the present invention disposed inside the steam drum;

in the figure: the system comprises a water tank 1, a first water pump 2, a steam generator 3, a sludge drier 4, a steam drum 5, a downcomer 6, a water-cooled wall 7, a superheater 8, a coal economizer 9, a turbine power generation unit 10, a condenser 11, a deaerator 12, a second water pump 13 and a condenser 14.

Detailed Description

The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the utility model provides a waste incineration plant sludge drying burns deals with system in coordination, including water tank 1, first water pump 2, steam generator 3, sludge drying machine 4, steam pocket 5, downcomer 6, water-cooling wall 7, over heater 8, economizer 9, turbo-generator group 10, condenser 11, oxygen-eliminating device 12, second water pump 13. The water outlet of the water tank 1 is connected with the first water pump 2, the first water pump 2 is connected with the water inlet of the steam generator 3, the steam outlet of the steam generator 3 is connected with the steam inlet of the sludge drier 4, the water outlet of the sludge drier 4 is connected with the water tank 1, and the steam outlet of the steam drum 5 is connected with the steam inlet of the steam generator 3. The water in the water tank 1 is conveyed into the steam generator 3 through the first water pump 2, the water entering the steam generator 3 is heated into superheated steam by saturated steam from the steam drum 5, the superheated steam enters the sludge drier 4 to carry out heat exchange drying on wet sludge, the superheated steam inside the sludge drier 4 is changed into saturated water after heat exchange, and then the saturated water enters the water tank 1, so that the cyclic utilization of water resources can be realized; the steam generator 3 is further connected with a superheater 8, and the superheater 8, the turbo generator set 10, the condenser 11, the deaerator 12, the second water pump 13, the economizer 9 and the steam drum 5 are communicated through pipelines in sequence.

The steam generator 3 and the steam drum 5 are connected with the downcomer 6 together, the downcomer 6 is connected with the water wall 7, the water wall 7 is connected with the steam drum 5, the downcomer 6 can recover saturated water formed after heat release of saturated steam in the steam generator 3 and the steam drum 5, and then the saturated water continuously absorbs heat through the water wall 7 and enters the steam drum 5 to be recycled.

In order to prevent the wet and hot waste gas generated by drying in the sludge drying machine from being discharged into the air to cause pollution, a steam outlet of the sludge drying machine is also connected with a condenser.

In the present application, the steam generator 3 may also be disposed inside the steam drum 5, so as to reduce the connection installation of the pipes, facilitating the arrangement.

The utility model provides a sludge drying of msw incineration factory burns in coordination with processing system's work flow does: water in the water tank 1 is sent into the steam generator 3 through the first water pump 2, saturated steam (the temperature is about 290 ℃) generated by the steam drum 5 enters the steam generator 3, partial saturated steam is condensed, phase change and heat release are carried out, the water provided by the first water pump 2 is heated into superheated steam (0.5 MPa/160 ℃), the saturated steam after heat release becomes saturated water, and the saturated water enters the water-cooled wall 7 through the downcomer 6 to continue heat absorption and then enters the steam drum 5 to be reused. Superheated steam enters the sludge drier 4 from a connecting pipeline of the steam generator 3 and the sludge drier 4 and indirectly exchanges heat with wet sludge in the sludge drier 4 to evaporate moisture in the wet sludge, the superheated steam after heat exchange is changed into saturated water to return to the water tank 1 for continuous circulation, the wet sludge is dehydrated until the moisture content is 20% -50% and is mixed and burnt in the furnace, wet hot waste gas generated in the drying process in the sludge drier 4 passes through the condenser 14, part of the wet hot waste gas is changed into condensate water, the condensate water is sent to a percolate treatment station of a garbage incineration plant through a pipeline, and the rest of the condensed waste gas is connected into a secondary air system. If redundant saturated steam exists in the steam generator 3, the steam generator can enter the superheater 8, then sequentially passes through the turbine power generation unit 10, the condenser 11, the deaerator 12, the second water pump 13, the economizer 9 and the steam drum 5, and continuously participates in the steam-water flow of the power plant.

The system can make the steam generator 3 generate steam under different parameters by adjusting the pressure of the steam supply system (such as a steam outlet adjusting valve and the like), and is suitable for the specific requirements of different sludge drying devices and projects on the water content of the sludge.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a waste incineration factory sludge drying burns in coordination with processing system which characterized in that: the system comprises a water tank (1), a first water pump (2), a steam generator (3), a sludge drier (4), a steam drum (5), a downcomer (6), a water-cooled wall (7), a superheater (8), an economizer (9), a turbine power generation unit (10), a steam condenser (11), a deaerator (12) and a second water pump (13), wherein a water outlet of the water tank (1) is connected with the first water pump (2), the first water pump (2) is connected with a water inlet of the steam generator (3), a steam outlet of the steam generator (3) is connected with a steam inlet of the sludge drier (4), and a water outlet of the sludge drier (4) is connected with the water tank (1); steam generator (3) still with superheater (8) are connected, superheater (8), turbo generator group (10), condenser (11), oxygen-eliminating device (12), second water pump (13), economizer (9) and steam pocket (5) loop through the pipeline intercommunication, the play steam port of steam pocket (5) with steam generator (3) advances the steam port and is connected.

2. The sludge drying and incineration cooperative disposal system of the waste incineration plant according to claim 1, wherein: the steam generator (3) and the steam drum (5) are jointly connected with the downcomer (6), the downcomer (6) is connected with the water wall (7), and the water wall (7) is connected with the steam drum (5).

3. The sludge drying and incineration cooperative disposal system of the waste incineration plant according to claim 1, wherein: and a steam outlet of the sludge drier (4) is connected with a condenser (14).

4. The sludge drying and incineration cooperative disposal system of the waste incineration plant according to claim 1, wherein: the steam generator (3) may also be arranged inside the steam drum (5).