CN214038442U

CN214038442U - Sludge blending combustion system

Info

Publication number: CN214038442U
Application number: CN202022672529.1U
Authority: CN
Inventors: 周民; 张小弟; 章华熔; 张天兴; 黄振兴; 沙德生; 于金伟; 嵇明明
Original assignee: Fujian Longking Co Ltd.; Huaneng Huaiyin Second Power Generation Co Ltd
Current assignee: Fujian Longking Co Ltd.; Huaneng Huaiyin Second Power Generation Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-24
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a system is burnt in mixing of mud, its sludge transport metering device's feed inlet is provided with and is used for kibbling mud breaker of mud, mud breaker can carry the conglobation or cubic that the metering device upper reaches was carried, the great sludge cake of weight is smashed into little specification, can reduce the influence that big specification mud gravity produced to the measurement like this, improve the measurement accuracy greatly, so that the mixing of coal-fired and mud burns the proportion and be in predetermined ratio scope, the mixing of coal-fired and mud burns the proportion precision greatly has been improved, can supply the coal condition of change according to boiler compound change or coal property characteristic change or coal bunker like this, the defeated mud volume of timely accurate adjustment sludge conveying mechanism, guarantee the stability and the homogeneity of mud and buggy mixing proportion.

Description

Sludge blending combustion system

Technical Field

The utility model relates to a sludge treatment technical field, in particular to sludge blending combustion system.

Background

With the rapid development of social economy and the continuous improvement of urbanization level, the discharge amount of industrial sewage and domestic sewage is increasing day by day, the sludge output of a sewage treatment plant is increased sharply, and the discharge amount of sludge (with the water content of 80%) of the sewage treatment plant reaches 6000 million tons in 2020 in accordance with the prediction of Ministry of housing and urban and rural construction. Although the sludge is rich in organic matters and various nutrient elements, the sludge also contains a large amount of pathogenic bacteria, parasitic ova, heavy metals, polyaromatic hydrocarbons and other toxic and harmful substances, and a series of problems of water eutrophication, soil pollution, germ transmission and the like can be caused if the sludge is stacked and directly discharged for a long time. The sludge in cities and towns in China is mainly buried, the landfill sites of main cities tend to be saturated, the phenomenon of sludge enclosing the city gradually occurs, and meanwhile, seepage liquid can permeate into soil and underground water after the fermentation of the landfill sludge, so that a new environmental protection problem is caused. In contrast, the sludge incineration can not only eliminate harmful substances, but also greatly reduce the volume of the sludge, and realize the recycling, harmless and reduction treatment of the sludge.

The coal-fired unit coupled sludge power generation is used as a utilization form of sludge incineration, has the advantages of large treatment capacity, strong adaptability, high system efficiency and the like, and has attracted much attention in recent years.

In the coupling sludge power generation technology of the existing power plant, sludge is fed into a coal yard to be mixed with pulverized coal, or is fed into a coal conveying trestle to be mixed with the pulverized coal, or a coal conveying belt fed into the top of a coal bunker is mixed with the pulverized coal, only one overall sludge and pulverized coal mixing proportion can be obtained, accurate control on the mixing of the sludge and the pulverized coal cannot be achieved, the sludge and pulverized coal mixing proportion is too low or too high in a certain period of time, the sludge mixing proportion in fuel entering a boiler is unstable, and the combustion stability of the boiler and the safety operation stability of a unit are affected.

Therefore, how to improve the stability of boiler combustion and the stability of safe operation of a unit after sludge blending combustion is a technical problem to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at improving the stability of boiler burning and the mud of the stability of unit safe operation mix the burning system.

The utility model provides a mud mixes system of burning, including mud storehouse, mud conveying mechanism and coal conveying mechanism, coal conveying mechanism is used for transporting the fire coal to mixing the station, still includes mud and carries metering device, set up in the low reaches in mud storehouse is used for weighing certainly the mud volume that the mud storehouse was unloaded, mud conveying mechanism is used for with certainly mud carries the mud that metering device was unloaded to transporting to mixing the station, and mud carries the feed inlet of metering device to be provided with mud breaker for broken mud.

The utility model provides a metering device is carried to mud's feed inlet is provided with mud breaker for mud is smashed. The sludge conveyed from the upstream of the sludge conveying and metering device can be agglomerated or blocky, the weight is large, and if the sludge directly falls into the sludge conveying and metering device, the metering is easily influenced due to the large gravity action of the sludge conveying and metering device, so that the metering accuracy is influenced. Under the effect of the sludge crushing device, large-sized sludge blocks are crushed into small sizes, the weighing accuracy is improved, the blending proportion of the fire coal and the sludge is in a preset proportioning range, the blending proportion precision of the fire coal and the sludge is greatly improved, the sludge conveying amount of the sludge conveying mechanism can be timely and accurately adjusted according to the composite change of a boiler or the change of coal quality characteristics or the change of coal supply of a coal bunker, and the stability and uniformity of the blending proportion of the sludge and the pulverized coal are ensured.

Optionally, the sludge crushing device comprises at least one crushing blade and a driving part, one end of each crushing blade is hinged to the inner wall of the feeding hole, and the driving part can drive the free end of each crushing blade to swing back and forth along the feeding direction;

or the sludge crushing device comprises at least one crushing blade, a driving shaft and a driving part, one end of each crushing blade is fixed with the driving shaft extending into the feeding hole, and the driving part drives the crushing blades to rotate or swing in a reciprocating mode through the driving shaft.

Optionally, the crushing device further comprises at least one blocking cone, one end of each blocking cone is fixed on the inner wall of the feeding hole, the other end of each blocking cone extends obliquely downwards, a preset distance is reserved between every two adjacent blocking cones, and at least one crushing blade is arranged between every two adjacent blocking cones.

Optionally, the blocking cone and the crushing blade are respectively arranged on two opposite side walls of the feeding hole.

Optionally, the cross section of the crushing blade comprises two upward and downward conical structures, and included angles of tip parts of the two conical structures are both 15-25 degrees; the cross section of the blocking cone is conical, the tip of the cone faces the feeding direction, and the included angle of the tip is 10-25 degrees.

Optionally, the driving part comprises a cylinder and a reciprocating gear rack pair, and the cylinder drives all the crushing blades to reciprocate up and down through the gear rack pair.

Optionally, the sludge conveying and metering device comprises a weighing sensor, and the weighing sensor is arranged at the middle rear part of the sludge conveying and metering device.

Optionally, the sludge treatment device further comprises a spiral conveying device, the spiral conveying device is arranged between the sludge bin and the sludge conveying and metering device, and the conveying speed of the spiral conveying device is adjustable.

Optionally, the discharge port of the sludge conveying and metering device may be further provided with a scraper for scraping sludge at the discharge port.

Optionally, the sludge conveying and metering device includes a housing having a cavity, the feed inlet is formed in the housing and can be communicated with the cavity, the housing is further provided with the discharge port, the housing is further provided with an air extraction port communicated with the cavity, the sludge mixed combustion system further includes an air extraction device, the air extraction device is communicated with the air extraction port through a pipeline and is used for extracting at least part of gas in the cavity to maintain a negative pressure state in the cavity when the working state is maintained.

Drawings

FIG. 1 is a schematic structural diagram of a sludge blending combustion system according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a sludge conveying mechanism according to an embodiment of the present invention;

FIG. 3 is an enlarged detail view taken at A in FIG. 2;

FIG. 4 is a top view of a sludge crushing device installed at a feed inlet according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a catch cone according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a crushing blade according to an embodiment of the present invention.

Wherein, in fig. 1 to 6:

1-sludge bin; 2-a screw conveyor; 3-a sludge conveying and metering device; 4-a sludge conveying mechanism; 5-a coal conveying mechanism; 6-a controller; 3-1-feed inlet; 3-2-a sludge crushing device; 3-3-a weighing sensor; 3-4-pipeline; 3-5-a discharge port; 3-6-scraper; 3-2-1 crushing blade; 3-2-2-block cone; 3-2-3-cylinder; 3-2-4 gear rack pairs.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 6, fig. 1 is a schematic structural diagram of a sludge co-combustion system according to an embodiment of the present invention; FIG. 2 is a schematic structural view of a sludge conveying mechanism according to an embodiment of the present invention; FIG. 3 is an enlarged detail view taken at A in FIG. 2; FIG. 4 is a top view of a sludge crushing device installed at a feed inlet according to an embodiment of the present invention; FIG. 5 is a schematic cross-sectional view of a catch cone according to an embodiment of the present invention; fig. 6 is a schematic cross-sectional view of a crushing blade according to an embodiment of the present invention.

The utility model provides a system is burnt in mixing of mud, this system include mud storehouse 1, mud conveying mechanism 4, coal conveying mechanism 5, mud transport metering device 3 and mud breaker 3-2.

The sludge conveying and metering device 3 is arranged at the downstream of the sludge bin 1 and is used for weighing the sludge discharged from the sludge bin 1. The sludge conveying mechanism 4 is used for conveying the sludge weighed by the sludge conveying and metering device 3 to the blending station, and the coal conveying mechanism 5 is used for conveying the fire coal to the blending station. The sludge and the fire coal are mixed at a blending station and then enter a boiler for combustion.

The sludge conveying mechanism 4 may include a screw conveyor, which is a mechanism for conveying materials by rotating a screw blade, and the specific structure of the mechanism may refer to the prior art and is not described in detail herein. Of course, the sludge conveying mechanism 4 can also be a belt or other conveying device. Similarly, the coal conveying mechanism 5 may be a spiral conveying device, or may be a coal conveying belt or other conveying devices such as a chain plate.

The sludge conveying and metering device 3 of the utility model is provided with a sludge crushing device 3-2 at a feed inlet 3-1 for sludge crushing. That is, the sludge delivered upstream of the sludge delivery and metering device 3 may be in a lump or block shape, and has a relatively large weight, and if the sludge directly falls into the sludge delivery and metering device 3, the measurement is easily affected due to the relatively large gravity action, and the measurement accuracy is affected. Under the action of the sludge crushing device 3-2, sludge blocks with larger sizes are crushed into small sizes, the weighing accuracy is improved, so that the blending combustion proportion of the fire coal and the sludge is in a preset proportioning range, the blending combustion proportioning accuracy of the fire coal and the sludge is greatly improved, the sludge conveying amount of the sludge conveying mechanism 4 can be timely and accurately adjusted according to the composite change of a boiler or the change of coal quality characteristics or the change of coal supply of a coal bunker, and the stability and uniformity of the mixing proportion of the sludge and the pulverized coal are ensured.

In the above embodiments, the sludge crushing apparatus 3-2 has various structures, and a specific embodiment is given below.

In a specific embodiment, the sludge crushing device 3-2 comprises at least one crushing blade 3-2-1 and a driving part, one end of each crushing blade 3-2-1 is hinged with the inner wall of the feeding hole 3-1, and the driving part can drive the free end of each crushing blade 3-2-1 to swing back and forth along the feeding direction.

The particular mounting structure of the uncrushed blade 3-2-1 is not shown, but is not an impediment to the understanding and practice of the solutions described herein by those skilled in the art.

Certainly, the crushing blades 3-2-1 can also be distributed around the rotating shaft, the rotating shaft partially extends into the feeding hole 3-1, the crushing blades 3-2-1 are connected and fixed on the rotating shaft, and the rotating shaft drives the crushing blades 3-2-1 to rotate or swing back and forth under the driving of the driving part, namely the driving part drives the crushing blades 3-2-1 to act through the rotating shaft so as to crush the sludge.

The driving component may be a motor, but may also be other components.

The crushing blades 3-2-1 swing back and forth along the feeding direction, so that the sludge can be crushed quickly while entering the sludge conveying and metering device 3 under the action of the dead weight.

Further, the sludge blending combustion system can also comprise at least one blocking cone 3-2-2, one end of each blocking cone 3-2-2 is fixed on the inner wall of the feeding hole 3-1, the other end of each blocking cone extends obliquely downwards, a preset interval is reserved between every two adjacent blocking cones 3-2-2, and at least one crushing blade 3-2-1 is arranged between every two adjacent blocking cones 3-2-2.

The blocking cone 3-2-2 can play a role in guiding and concentrating the sludge, and is beneficial to the crushing blade 3-2-1 to comprehensively crush the sludge.

In a specific embodiment, the blocking cone 3-2-2 and the crushing blade 3-2-1 are respectively arranged on two opposite side walls of the feed opening 3-1.

This arrangement facilitates an optimal arrangement of the blocking cone and the crushing blades.

Of course, the installation positions of the blocking cone 3-2-2 and the crushing blade 3-2-1 are not limited to the above description, and other installation modes can be adopted.

In one embodiment, the cross section of the crushing blade 3-2-1 comprises two upward and downward conical structures, and the included angle a of the tip parts of the two conical structures ranges from 15 degrees to 25 degrees. Thus, the flowing and the crushing of the sludge are facilitated.

Further, a specific embodiment of the baffle cone 3-2-2 is also provided. The cross section of the baffle cone 3-2-2 is conical, the tip of the cone faces the feeding direction, and the included angle b of the tip is 10-25 degrees.

Of course, the structures of the crushing blade 3-2-1 and the stopper cone 3-2-2 are not limited to the above description as long as effective crushing for sludge can be achieved.

In one embodiment, the driving part comprises a cylinder 3-2-3 and a reciprocating rack gear pair 3-2-4, and the cylinder 3-2-3 drives all crushing blades to reciprocate up and down through the rack gear pair 3-2-4. The cylinder 3-2-3 and the reciprocating gear rack pair 3-2-4 can be both arranged on the shell of the sludge conveying and metering device 3.

The sludge conveying and metering device 3 can realize accurate weighing of sludge flowing out of the sludge bin 1. The sludge conveying and metering device 3 can comprise a weighing sensor 3-3, and the weighing sensor 3-3 can be arranged at the middle rear part of the sludge conveying and metering device 3, so that the influence of sludge feeding at the feed inlet 3-1 on the measurement precision can be avoided as much as possible, and the measurement accuracy is improved.

In the above embodiments, the sludge blending combustion system may further include a screw conveyor 2 disposed between the sludge bin 1 and the sludge conveying and metering device 3, and a conveying speed of the screw conveyor 2 is adjustable. The conveying speed of the spiral conveying device 2 can be further adjusted according to the coal burning quantity.

Sludge crushing device because mud belongs to foul class medium, volatilizees foul class gas such as ammonia, methane, hydrogen sulfide easily in mud storage and transportation process, especially in measurement process foul diffusion mud in order to prevent mud from carrying metering device 3, causes the foul smell pollution of external environment, and this paper has still further carried out following setting.

Specifically, the sludge conveying and metering device 3 comprises a shell with an accommodating cavity, the shell is further provided with an air pumping port communicated with the accommodating cavity, the sludge mixed combustion system further comprises an air pumping device, the air pumping device is communicated with the air pumping port through a pipeline 3-4 and used for pumping out at least part of air in the accommodating cavity so as to maintain the negative pressure state in the accommodating cavity when the working state is maintained, and therefore odor cannot be leaked out of the device.

The shell is provided with a discharge port 3-5 and a feed port 3-1 which are communicated through the containing cavity, and sludge enters a downstream conveying device at the discharge port 3-5.

Furthermore, the discharge port 3-5 of the sludge conveying and metering device 3 can be also provided with a scraper 3-6 for scraping the sludge at the position of the discharge port 3-5. Because the sludge has certain viscosity and is easy to adhere to the sludge conveying device, the scrapers 3-6 are arranged at the discharge ports 3-5, so that the sludge on the sludge conveying and metering device 3 is timely and cleanly treated, and the influence on the measurement precision and the use of the sludge conveying and metering device 3 due to long-time sludge adhesion is prevented.

In the above embodiments, the actions of the components can be controlled by the controller 6, and the regulation and control of the sludge conveying mechanism by the controller 6 can be realized by limited experiments and debugging. For example, the controller 6 can perform integral operation on the sludge conveying weight signal, the conveying speed of the sludge conveying mechanism 4 and the coal powder conveying amount signal of the coal conveying mechanism 5 to obtain an instantaneous sludge and coal powder flow value and an accumulation value, calculate an instantaneous sludge mixing proportion value, compare the instantaneous sludge and coal powder flow value with a set sludge mixing proportion value, and feed back a signal to adjust the sludge conveying speed of the sludge conveying mechanism in time. Therefore, the sludge blending combustion system is more automatic.

The above is a detailed introduction to the sludge blending combustion system provided by the utility model. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The sludge blending combustion system comprises a sludge bin (1), a sludge conveying mechanism (4) and a coal conveying mechanism (5), wherein the coal conveying mechanism (5) is used for conveying fire coal to a blending station, and is characterized by further comprising a sludge conveying metering device (3) arranged at the downstream of the sludge bin (1) and used for weighing the sludge discharged from the sludge bin (1), the sludge conveying mechanism (4) is used for conveying the sludge discharged from the sludge conveying metering device (3) to the blending station, and a sludge crushing device (3-2) is arranged at a feed inlet (3-1) of the sludge conveying metering device (3) and used for crushing sludge.

2. The sludge blending combustion system as claimed in claim 1, wherein the sludge crushing device (3-2) comprises at least one crushing blade (3-2-1) and a driving part, one end of each crushing blade (3-2-1) is hinged with the inner wall of the feeding port (3-1), and the driving part can drive the free end of each crushing blade (3-2-1) to swing back and forth along the feeding direction;

or the sludge crushing device (3-2) comprises at least one crushing blade (3-2-1), a driving shaft and a driving part, one end of each crushing blade (3-2-1) is fixed with the driving shaft extending into the feeding hole (3-1), and the driving part can drive the driving shaft to rotate so as to enable the crushing blade (3-2-1) to swing in a reciprocating mode along the feeding direction.

3. The sludge blending combustion system as claimed in claim 2, further comprising at least one blocking cone (3-2-2), wherein one end of each blocking cone (3-2-2) is fixed to the inner wall of the feed port (3-1), the other end of each blocking cone extends obliquely downward, a predetermined interval is provided between adjacent blocking cones (3-2-2), and at least one crushing blade (3-2-1) is arranged between adjacent blocking cones (3-2-2).

4. The sludge blending combustion system as claimed in claim 3, wherein the baffle cone (3-2-2) and the crushing blade (3-2-1) are respectively disposed at two opposite side walls of the feed port (3-1).

5. The sludge blending combustion system as claimed in claim 3, wherein the cross section of the crushing blade (3-2-1) comprises two upward and downward conical structures, and the included angle (a) of the tip parts of the two conical structures ranges from 15 degrees to 25 degrees; the cross section of the blocking cone (3-2-2) is conical, the tip of the cone faces the feeding direction, and the included angle (b) of the tip is 10-25 degrees.

6. The sludge blending combustion system as claimed in claim 2, wherein the driving part comprises a cylinder (3-2-3) and a reciprocating gear rack pair (3-2-4), and the cylinder (3-2-3) drives all the crushing blades (3-2-1) to reciprocate up and down through the gear rack pair (3-2-4).

7. The sludge blending combustion system as claimed in claim 1, wherein the sludge conveying and metering device (3) comprises a weighing sensor (3-3), and the weighing sensor (3-3) is arranged at the middle rear part of the sludge conveying and metering device (3).

8. The sludge blending combustion system as claimed in claim 1, further comprising a screw conveyor (2) disposed between the sludge bin (1) and the sludge conveying and metering device (3), wherein the conveying speed of the screw conveyor (2) is adjustable.

9. The sludge blending combustion system as claimed in claim 1, wherein the discharge port (3-5) of the sludge conveying and metering device (3) is further provided with a scraper (3-6) for scraping the sludge at the discharge port (3-5).

10. The sludge blending combustion system as claimed in any one of claims 1 to 9, wherein the sludge delivery metering device (3) comprises a housing having a cavity, the feed inlet (3-1) is formed in the housing and can be communicated with the cavity, the housing is further provided with a discharge port, the housing is further provided with an air pumping port communicated with the cavity, the sludge blending combustion system further comprises an air pumping device, the air pumping device is communicated with the air pumping port through a pipeline (3-4) and is used for pumping at least part of air in the cavity so as to maintain a negative pressure state in the cavity when in a working state.