CN216039213U

CN216039213U - Device for blending combustion of municipal sludge in pulverized coal furnace of thermal power plant

Info

Publication number: CN216039213U
Application number: CN202122518676.8U
Authority: CN
Inventors: 张广成; 盖晓英; 朿成莉; 吕扬; 杨凤岭; 蔡延民; 尹鹏; 王国威
Original assignee: Shandong Guoshun Construction Group Co Ltd
Current assignee: Shandong Guoshun Construction Group Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-03-15
Anticipated expiration: 2031-10-19

Abstract

The utility model relates to a device for blending and burning urban sludge in a pulverized coal furnace of a thermal power plant, which comprises a drier and a pre-drying mixing device, wherein the top of the pre-drying mixing device is a sludge inlet, the bottom of the pre-drying mixing device is a sludge outlet, and the pre-drying mixing device is obliquely arranged relative to the drier; the sludge outlet of the pre-drying mixing device is connected with the feed inlet of the drier, the position of the pre-drying mixing device, which is close to the sludge outlet, is provided with a rotary uniform distributor, the sludge inlet end of the pre-drying mixing device is provided with a plurality of ejectors, the rotary uniform distributor is provided with a helical blade structure, and the ejectors are connected with a high-temperature flue gas source. The drying efficiency of the drying machine is improved, and the energy consumption of the later incineration of the sludge is reduced. Is beneficial to the recycling, harmless and reduction treatment of the sludge.

Description

Device for blending combustion of municipal sludge in pulverized coal furnace of thermal power plant

Technical Field

The utility model belongs to the technical field of sludge treatment devices, and particularly relates to a device for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant.

Background

The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

At present, the common methods for treating sludge (hereinafter referred to as municipal sludge) generated by municipal sewage treatment in the world comprise various sludge treatment modes such as sanitary landfill, biological compost, power generation by fermenting methane again, drying and incineration and the like. Among them, the sanitary landfill operation is relatively simple, the investment cost is small, the treatment cost is low, but the land occupation is serious, the site selection is difficult, the transportation cost is high, and if the anti-seepage technology is not enough, the potential soil and underground water pollution is caused. For the above reasons, with the increase of sludge amount, the proportion of municipal sludge landfill treatment in China is smaller and smaller, and the technology is basically abandoned in countries such as the United states, European Union and the like. Sludge agriculture can make organic matters reenter natural environment, but also has certain risk: a large amount of pathogenic bacteria, parasites (eggs), heavy metals such as chromium and mercury, and nondegradable toxic and harmful substances such as polychlorinated biphenyl, dioxin and radioactive nuclide contained in the sludge can enter the environment along with the pathogenic bacteria, the parasites (eggs), the heavy metals such as chromium and mercury, and the nondegradable toxic and harmful substances, so that the whole biological chain is influenced, and the health of human beings is finally harmed. The sludge needs to be subjected to non-toxic and harmless treatment for agricultural treatment, so that the requirement of various countries on the agricultural sludge standard is more and more strict, which brings great difficulty to sludge agriculture. In order to prevent the pollution components such as heavy metals contained in the sludge from entering the human body through the way of fertilizers, melons, fruits, vegetables and foods, high-temperature incineration is generally adopted in Japan, Europe and the like.

The industrial sludge drying incineration has obvious advantages and can treat sludge relatively thoroughly, but if a sludge incineration plant is newly built for the purpose of treating sludge, the one-time investment cost is high, the treatment cost is high, and the problems that the discharged gas after combustion pollutes the atmosphere and the like are caused.

The inventor finds that in the existing sludge drying and incinerating process, the incinerated flue gas and the sludge are used for drying, and then the sludge is incinerated, but the drying method has the disadvantages of poor sludge drying effect, low drying efficiency, large energy consumption and large energy consumption in later sludge incineration.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model aims to provide a device for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a device for blending and burning urban sludge in a pulverized coal furnace of a thermal power plant comprises a drier and a pre-drying mixing device, wherein the top of the pre-drying mixing device is a sludge inlet, the bottom of the pre-drying mixing device is a sludge outlet, and the pre-drying mixing device is obliquely arranged relative to the drier;

the sludge outlet of the pre-drying mixing device is connected with the feed inlet of the drier, the position of the pre-drying mixing device, which is close to the sludge outlet, is provided with a rotary uniform distributor, the sludge inlet end of the pre-drying mixing device is provided with a plurality of ejectors, the rotary uniform distributor is provided with a helical blade structure, and the ejectors are connected with a high-temperature flue gas source.

According to the utility model, the predrying mixing device is arranged at the inlet of the sludge drying machine, so that the premixing effect of sludge and high-temperature flue gas can be improved, the uniformity of sludge entering the drying machine is improved, the drying efficiency of the drying machine is improved, and the drying effect of the sludge can be improved.

One or more technical schemes of the utility model have the following beneficial effects:

1. the treatment device provided by the utility model has the advantages that the predrying device is matched with the drier, the drying efficiency of the drier is improved, the energy consumption of later-stage incineration of sludge is reduced, the resource utilization of the sludge can be better realized, the sludge has a certain heat value, and the energy can be recovered for power generation and heat supply.

2. The utility model can better realize the harmless treatment of the sludge, achieves the harmless effect, provides a new way for sludge treatment for sewage treatment plants, can eliminate the existing and potential environmental hazards of the sludge as soon as possible, and improves the environment.

3. The utility model can better realize the reduction treatment of the sludge, and the sludge is dried and then enters the subsequent incineration treatment, thereby reducing the land occupation of sludge landfill and purifying the environment; can bring good social benefit and greatly reduce the pollution of ground water and underground water.

4. The treatment device of the utility model does not need to invest in building a new plant, and can be directly co-fired with the fire coal of the existing thermal power plant, namely, the dried sludge is directly mixed with the fire coal of the thermal power plant, thus saving a series of investments such as investment for building the plant, purchasing equipment, subsequent operation management and the like.

5. The volume of the sludge is greatly reduced, the pressure of insufficient land landfill volume is reduced, land resources are saved for the country, landfill cost is saved for the local, the problems of sludge volume reduction and resource utilization are fully solved, and the method conforms to the basic guidelines and policies for developing circular economy and constructing a harmonious society advocated by the country.

6. The treatment device of the utility model has high sludge treatment speed and does not need long-term storage.

7. After incineration, moisture, organic matters and the like in the residual sludge are decomposed, and only a small amount of inorganic matters are left to become incineration ash, so that substances which need to be treated finally are few, the problem of heavy metal ions is avoided, and the incineration ash can be prepared into useful products such as building materials, and is a relatively safe sludge treatment mode.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.

FIG. 1 is an overall structure diagram of a device for co-firing municipal sludge in a pulverized coal furnace of a thermal power plant;

FIG. 2 is a partially enlarged view of a predrying mixing device of a device for blending combustion of municipal sludge in a pulverized coal furnace of a thermal power plant;

FIG. 3 is a schematic side view of a rotary homogenizer of a pre-drying mixing device;

FIG. 4 is a schematic top view of a rotary homogenizer of a pre-drying mixing device;

the system comprises a wet sludge storage bin 1, a wet sludge screw pump 2, a drier 3, a blower 4, a blower 5, a first feeder 6, a second feeder 7, a dry sludge buffer bin 8, a cyclone separator 9, a ventilator 10, a rotary feeding valve 11, a pre-drying mixing device 12, a rotary uniform distributor 13, a spiral blade 14, a rotating shaft 15, a fixing piece 16, a high-temperature smoke gas source 17, a dust remover 18 and a coal-removing furnace coal feeder.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

A device for blending and burning urban sludge in a pulverized coal furnace of a thermal power plant comprises a drier 3 and a pre-drying mixing device 11, wherein the top of the pre-drying mixing device 11 is a sludge inlet, the bottom of the pre-drying mixing device 11 is a sludge outlet, and the pre-drying mixing device 11 is obliquely arranged relative to the drier 3;

the sludge outlet of the pre-drying mixing device 11 is connected with the feed inlet of the drier 3, the position of the pre-drying mixing device 11 close to the sludge outlet is provided with a rotary uniform distributor 12, the position of the pre-drying mixing device 11 close to the sludge inlet is provided with a plurality of ejectors, the rotary uniform distributor 12 is provided with a helical blade structure, and the ejectors are connected with a high-temperature flue gas source 16.

After entering the pre-drying mixing device 11, the sludge is in direct contact with high-temperature flue gas sprayed by the sprayer, and is rotatably cut by the helical blades under the action of the rotary uniform distributor 12, so that the sludge is crushed, and the scattered wet particles are in contact with the high-temperature flue gas. The uniformity of the sludge is ensured. Therefore, the sludge and the high-temperature flue gas are mixed and pre-dried in the pre-drying and mixing device, then enter the drier 3, and are mixed through the pre-drying and mixing device 11, so that the uniformity of the sludge entering the drier 3 is improved, the mixing efficiency of the sludge and the flue gas is improved, the drying effect of the high-temperature flue gas on the sludge can be improved, and the drying efficiency of the drier 3 is improved.

The pre-drying mixing device 11 is obliquely arranged relative to the feeding hole of the drier 3, so that sludge particles can slide down to the feeding hole of the drier 3 under the action of gravity.

As a further technical solution, as shown in fig. 3 and 4, the rotary uniform distributor 12 includes a spiral blade 13, a rotary shaft 14, and a fixing piece 15, the motor is connected to the rotary shaft 14, the rotary shaft 14 is connected to the spiral blade 13, the fixing piece 15 is disposed on the top of the spiral blade 13, the fixing piece 15 is attached to the top surface of the spiral blade 13, and one end of the fixing piece 15 is fixedly connected to the rotary shaft. The fixing piece 15 is used for fixedly connecting the spiral blade and the rotating shaft, and the stability of the cutting and mixing effect of the spiral blade on sludge can be improved. The helical blade is used for scattering sludge in the pre-drying mixing device, and the scattered wet particles are contacted with high-temperature flue gas. The reaction force of sludge received by the helical blade is also larger in the scattering process, so that the mechanical strength of the helical blade can be improved by fixing the fixing sheet, and the scattering effect is improved.

As a further technical scheme, the rotary uniform distributor 12 is connected with the side wall of the pre-drying mixing device 11, a certain included angle is formed between the rotary shaft of the rotary uniform distributor and the side wall of the pre-drying mixing device, the rotary uniform distributor is inclined towards the sludge outlet direction of the pre-drying mixing device, and the spiral blades 13 are arranged along the axial direction of the pre-drying mixing device. As shown in figure 2, the rotating shaft 14 inclines towards the direction of the sludge outlet, so that the buffering effect of the sludge and the rotating uniform distributor 12 can be realized, the process that materials go down from the sludge inlet to the sludge outlet inclines downwards, the impact of the sludge on the rotating uniform distributor 12 is large, and the impact can be reduced by the inclined arrangement. Meanwhile, the helical blades 13 are arranged along the axial direction of the pre-drying and mixing device, so that the sludge scattering process is facilitated.

Further, three helical blades 13 are provided. The helical blades 13 and the rotating shaft 14 are made of 2205 materials resistant to abrasion and corrosion.

As a further technical scheme, a plurality of ejectors are distributed in the circumferential direction of the pre-drying mixing device. The high-temperature flue gas ring enters the pre-drying mixing device through the plurality of air inlets.

As a further technical scheme, a feed inlet of the drying machine 3 is connected with a high-temperature flue gas source 16. And (3) the high-temperature flue gas enters a drier to directly contact with pre-dried sludge, and mass heat exchange is carried out to remove moisture.

As a further technical scheme, a spiral blade type stirrer is arranged in the drier 3. The wet sludge particles can be more fully contacted with the high-temperature flue gas through the rotation of the helical blades of the stirrer.

And one part of the high-temperature flue gas is taken from an inlet of the air preheater, the other part of the high-temperature flue gas is taken from an electric dust removal outlet, and the tail gas of the dryer is conveyed to a front flue of the electric dust remover of the power plant by an induced draft fan, enters a chimney together with the flue gas after dust removal, and is finally discharged into the atmosphere.

As shown in fig. 1, the device for co-burning municipal sludge in the coal-powder furnace of the thermal power plant further comprises the following structure:

as a further technical scheme, the bottom of the drier 3 is provided with an ash collecting hopper.

As a further technical scheme, the drying machine further comprises a cyclone separator 8, an air outlet is formed in the top of the drying machine, and the air outlet is connected with the cyclone separator 8.

Further, the device comprises a dry sludge buffer bin 7, a solid material outlet at the bottom of the cyclone separator 8 is connected with the dry sludge buffer bin 7, and an outlet of the dry sludge buffer bin is connected with an outlet of the ash collecting hopper.

The sludge particles with moisture removed are divided into two parts, large particles enter an ash collecting hopper at the bottom of the dryer, a rotary feeding valve 10 and a first feeder 5 are arranged at the lower part of the ash collecting hopper, and dry sludge particles are pneumatically conveyed to a boiler coal feeder through a Roots blower in the first feeder 5 through the rotary feeding valve 10 and enter a coal mill together with coal; the dried fine dry sludge powder enters a cyclone separator 8 on the upper part of a dry sludge buffer bin through an outlet on the upper part of a dryer 3 under the action of the pumping force of a ventilator, larger particles enter the dry sludge buffer bin 7 to be stored under the action of the cyclone separator 8, a rotary feed valve 10 and a second feeder 6 are arranged on the lower part of the dry sludge buffer bin 7, dry sludge dust in the bin passes through the rotary feed valve 10 and is pneumatically conveyed to a boiler coal feeder through an air feeder 4 in the feeder, materials discharged from a discharge port of the second feeder are conveyed to the coal feeder 18 on the next step, are conveyed to a raw coal bin together with coal through the coal feeder, and finally enter a boiler together with the coal to be incinerated. The mixed gas discharged from the top air outlet of the cyclone separator 8 enters a ventilator 9 and then goes to a dust remover 17. The wind containing the powder bin of the cyclone separator is sent into a flue in front of the electric dust remover through a ventilator 9, and the sludge and dust are separated out through the electric dust remover, so that the sludge is purified.

As a further technical scheme, the cyclone separator further comprises a dust remover, and a gas outlet of the cyclone separator is connected with the dust remover. The dust remover may be an electric dust remover.

As a further technical scheme, the sludge pre-drying device further comprises a wet sludge storage bin 1, wherein a discharge port of the wet sludge storage bin 1 is connected with a wet sludge screw pump 2, and an outlet of the wet sludge screw pump 2 is connected with a feed port of the pre-drying mixing device.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a device that thermal power factory buggy stove mixes burning municipal sludge which characterized in that: the sludge pre-drying and mixing device comprises a drying machine and a pre-drying and mixing device, wherein the top of the pre-drying and mixing device is a sludge inlet, the bottom of the pre-drying and mixing device is a sludge outlet, and the pre-drying and mixing device is obliquely arranged relative to the drying machine;

2. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 1, wherein: the rotary uniform distributor comprises a spiral blade, a rotating shaft and a fixing piece, the motor is connected with the rotating shaft, the rotating shaft is connected with the spiral blade, the fixing piece is arranged at the top of the spiral blade and attached to the blade top surface of the spiral blade, and one end of the fixing piece is fixedly connected with the rotating shaft.

3. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 2, wherein: the rotary uniform distributor is connected with the side wall of the pre-drying mixing device, a rotary shaft of the rotary uniform distributor and the side wall of the pre-drying mixing device have a certain included angle, and the rotary shaft is inclined towards the sludge outlet direction of the pre-drying mixing device, and the helical blades are arranged along the axial direction of the pre-drying mixing device.

4. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 1, wherein: several injectors are distributed in the circumferential direction of the pre-drying mixing device.

5. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 1, wherein: the inside of the drier is provided with a spiral blade type stirrer.

6. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 1, wherein: the bottom of the drier is provided with an ash collecting hopper.

7. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 6, wherein: the drying machine also comprises a cyclone separator, wherein the top of the drying machine is provided with an air outlet, and the air outlet is connected with the cyclone separator.

8. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 7, wherein: the device comprises a dry sludge buffer bin, wherein a solid material outlet at the bottom of a cyclone separator is connected with the dry sludge buffer bin, and an outlet of the dry sludge buffer bin is connected with an outlet of an ash collecting hopper.

9. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 7, wherein: the cyclone separator also comprises a dust remover, and a gas outlet of the cyclone separator is connected with the dust remover.

10. The apparatus for co-combustion of municipal sludge in a pulverized coal furnace of a thermal power plant according to claim 1, wherein: still include wet sludge and store the storehouse, wet sludge screw pump is connected to the discharge gate in wet sludge storage storehouse, and the export of wet sludge screw pump is connected with predrying mixing arrangement's feed inlet.