CN212955000U

CN212955000U - System for utilize power boiler waste heat pyrolysis seaweed

Info

Publication number: CN212955000U
Application number: CN202021564484.XU
Authority: CN
Inventors: 武鹏举; 刘杨先; 陈洁; 倪学为; 詹柏武
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-04-13
Anticipated expiration: 2030-07-31

Abstract

The utility model provides a system for pyrolyzing seaweed by utilizing the waste heat of a power plant boiler, which comprises an air preheater, a pyrolyzing furnace and a pretreatment mechanism; the air preheater is arranged in a flue, one end of the flue is communicated with the boiler, and the other end of the flue is connected with a dust removal and purification device; the outside air enters an air preheater to be heated; the outlet end of the air preheater is provided with a gas splitter valve, and heated air flows into the first pipeline and the second pipeline through the gas splitter valve; the pretreatment mechanism is communicated with the first pipeline, and the seaweed is treated by the pretreatment mechanism and then enters the pyrolysis furnace for pyrolysis; an inlet at the upper end of the pipe ring is communicated with the second pipeline, and an outlet at the lower end of the pipe ring is connected with the outside; boiler waste heat on the one hand can be used to dry marine alga, and on the other hand provides the required heat of pyrolysis marine alga, and the in-process preparation of pyrolysis marine alga obtains the biomass energy, improves boiler waste heat utilization, accomplishes to rationally applying ocean resource, and does not need additionally to install pyrolysis marine alga tail gas processing apparatus, and the cost is reduced has good market prospect.

Description

System for utilize power boiler waste heat pyrolysis seaweed

Technical Field

The utility model belongs to the technical field of power plant's boiler waste heat recovery, concretely relates to utilize system of power plant's boiler waste heat pyrolysis marine alga.

Background

With the increasing trend of energy crisis, people are increasingly conscious of environmental protection, and energy conservation and emission reduction become the focus of concern at home and abroad. A large amount of resources are consumed in the process of producing electric energy by the coal-fired power plant, a large amount of energy is wasted, and especially, a large amount of low-temperature flue gas waste heat is discharged into the air, so that the heat efficiency of the power plant is reduced, and the environment is damaged to a certain extent. At the present stage, the utilization of the flue gas waste heat of the boiler of the power plant in China is still mainly in two modes, namely, the flue gas waste heat is utilized to heat circulating water and air of the boiler, and the waste heat is converted into mechanical power or electric energy, so that the two modes have the problems of low energy grade, low efficiency of converting the waste heat into the mechanical energy and the electric energy and the like.

The marine resources of China are rich, and the seaweed serving as one of the marine resources is rich in variety, has the advantages of low cultivation cost, high production rate, strong adaptability, high photosynthetic efficiency and the like, and can be used as a raw material for preparing biomass energy. The bio-oil prepared by pyrolyzing the seaweed can be used for extracting high-quality biodiesel and can also be used for baking furnace fuel oil in the starting stage of a power plant boiler; the biochar prepared after pyrolysis can replace expensive activated carbon, can be used as an adsorbent to adsorb and remove various flue gas pollutants in a power plant boiler, such as sulfur dioxide, nitrogen oxides and heavy metals (mercury, arsenic and selenium), and has high resource value. However, the existing preparation method of the pyrolysis seaweed needs to consume more energy and has higher production cost. Therefore, the method can develop and utilize the waste heat generated in the power plant boiler, and has positive significance for improving the utilization rate of the waste heat of the boiler, preparing biomass energy and the like in the technology of preparing the biomass oil and the biomass charcoal by pyrolyzing the seaweed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art not enough, provide an utilize system of power plant's boiler waste heat pyrolysis marine alga, the boiler waste heat can be used to dry marine alga on the one hand, is convenient for carry out the preliminary treatment to the marine alga, and on the other hand provides the required heat of pyrolysis marine alga to can follow the in-process preparation of pyrolysis marine alga and obtain the biomass energy, improve boiler waste heat utilization ratio, accomplish the reasonable application to ocean resource.

The technical scheme of the utility model is that:

a system for pyrolyzing seaweed by using waste heat of a power plant boiler comprises an air preheater, a pyrolyzing furnace and a pretreatment mechanism; the air preheater is arranged in a flue, one end of the flue is communicated with the boiler, and the other end of the flue is connected with a dust removal purification device; the outside air enters the air preheater to be heated; the outlet end of the air preheater is provided with a gas splitter valve, and heated air flows into the first pipeline and the second pipeline through the gas splitter valve; the pretreatment mechanism is communicated with the first pipeline, and the seaweed is treated by the pretreatment mechanism and then enters the pyrolysis furnace for pyrolysis;

the pyrolysis furnace comprises a shell and an inner container; a pipe ring is arranged on the outer wall of the inner container, an inlet at the upper end of the pipe ring is communicated with the second pipeline, and an outlet at the lower end of the pipe ring is connected with the outside; the first-stage cooling device is communicated with the pyrolysis furnace through an exhaust hole formed in the side wall of the shell; the first-stage cooling device is communicated with the second-stage cooling device; the second-stage cooling device is connected with the dust removal and purification device through a third pipeline; and the flue gas generated by the boiler and the tail gas generated by the pyrolysis furnace are treated by the dust removal purification device and then discharged into the external environment.

In the above scheme, the inlet end of the air preheater is provided with a first fan; and a second fan is arranged at the outlet end of the dust removal and purification device.

In the scheme, the pretreatment mechanism comprises a drying device, a crushing device and a material storage device which are sequentially arranged; one end of the crushing device is communicated with the drying device, and the other end of the crushing device is communicated with the material storage device; the first pipeline is communicated with the drying device; the material storage device is communicated with the pyrolysis furnace.

In the scheme, a heat insulating material is filled between the outer shell and the inner container, and the heat conductivity coefficient of the heat insulating material is less than 0.12 w/(m.k); the distance between the outer shell and the inner container is 0.5-1 m; the outer diameter of the inner container is 3-5 m.

In the scheme, the pipe ring is spiral, the inner diameter of the pipe ring is 0.1-0.3 m, and the outer diameter of the pipe ring is 0.3-0.5 m; the distance between adjacent pipelines of the pipe ring is 0.45-0.75 m; the heat conductivity coefficients of the inner container and the pipe ring are more than 300 w/(m.k).

In the scheme, the bottom of the pyrolysis furnace is provided with a slag discharge hole, and a slag discharge hole plug is in threaded connection with the slag discharge hole; the diameter of the slag discharge hole is 0.6-1 m; the inner side of the exhaust hole is provided with a gas-solid separator.

Compared with the prior art, the beneficial effects of the utility model are that:

1. utilize power plant's boiler waste heat pyrolysis marine alga system in, the waste heat that the boiler flue gas produced heats the air in the air heater, the air after the heating is partly let in among the preprocessing device for carry out drying process to wet marine alga, the other portion lets in the tube coil in the pyrolysis furnace, for the pyrolysis marine alga provides required heat, practices thrift the required energy of conventional pyrolysis marine alga device, reduces boiler flue gas temperature, has improved boiler waste heat utilization, reduces the harm of high temperature flue gas to the environment.

2. Utilize power plant's boiler waste heat pyrolysis marine alga system, to the problem that present power plant's boiler waste heat utilization rate is low, utilize the marine alga to acquire easily, the high advantage of resource value, be used for the pyrolysis marine alga with the boiler waste heat, can prepare at the in-process of pyrolysis marine alga and obtain the biomass energy, can alleviate the energy crisis of current to a certain extent, accomplish the reasonable application to ocean resource.

3. Utilize power boiler waste heat pyrolysis marine alga's system, be equipped with dust purification device in the flue, the flue gas that the boiler produced can emit into the atmosphere after handling, avoids polluting external environment, scientific environmental protection, during the tail gas that produces in the pyrolysis furnace also lets in dust purification device simultaneously, does not need additionally to install pyrolysis marine alga tail gas processing apparatus, reduce cost, economic suitability is strong, has good market prospect.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is a schematic view of a partial structure of the pyrolysis furnace.

In the figure:

1-an air preheater; 2-gas diverter valve; 3-a pyrolysis furnace; 301-a housing; 302-an insulating material; 303-inner container; 304-a tube coil; 305-slag discharge holes; 306-a plug of a slag discharge hole; 307-gas-solid separator; 308-exhaust hole; 4-a first stage cooling device; 5-a second stage cooling device; 6-a pretreatment mechanism; 7-a dust removal purification device; 8-a boiler; 9-flue; 10-a first fan; 11-a second fan; 12-a first conduit; 13-a second conduit; 14-a third conduit.

Detailed Description

The invention will be further described with reference to the drawings and the following examples, but the scope of the invention is not limited thereto.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is conventionally placed when the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element to which the present invention is directed must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and 2, the system for pyrolyzing seaweed by using waste heat of a power plant boiler of the present invention comprises an air preheater 1, a pyrolysis furnace 3, and a pretreatment mechanism 6; the air preheater 1 is arranged in a flue 9, one end of the flue 9 is communicated with a boiler 8, and the other end of the flue 9 is connected with a dust removal purification device 7; the flue gas generated by the boiler 8 can heat the air preheater 1 arranged in the flue 9, and the flue gas is finally treated by the dust removal purification device 7 and then discharged into the external environment. The inlet end of the air preheater 1 is provided with a first fan 10 for blowing outside air into the air preheater 1, and the air in the air preheater 1 is heated by flue gas and then flows to the outlet end of the air preheater 1; the outlet end of the air preheater 1 is provided with a gas diverter valve 2, the gas diverter valve 2 divides the hot air into two parts, one part of the hot air flows into the first pipeline 12, and the other part of the hot air flows into the second pipeline 13.

The pretreatment mechanism 6 comprises a drying device, a crushing device and a material storage device which are arranged in sequence; the drying device is communicated with the crushing device, and the crushing device is communicated with the material storage device. The first pipe 12 is in communication with the pre-treatment means 6, in particular, said first pipe 12 is in communication with the drying means. The top of the drying device is provided with a feeding port, wet seaweed enters from the feeding port, hot air in the first pipeline 12 provides heat for the drying device to dry the wet seaweed, the dried seaweed is fed into the crushing device, the dried seaweed is crushed into fine powder and then is sent into the storage device to be stored, the crushed seaweed is crushed into fine powder to facilitate the sufficient pyrolysis of the seaweed, and when the seaweed is stored to a certain amount, the seaweed is sent into the pyrolysis furnace 3 to be pyrolyzed.

The pyrolysis furnace 3 comprises an outer shell 301 and an inner container 303; the outer wall of the inner container 303 is provided with a pipe ring 304, and preferably, the pipe ring 304 is spirally attached to the outer wall of the inner container 303. The inlet at the upper end of the coil 304 is communicated with the second pipeline 13, the hot air introduced into the second pipeline 13 is used for heating the pyrolysis furnace 3, the energy required by the conventional seaweed pyrolyzing device is saved, and the hot air is directly discharged into the atmospheric environment after the heat exchange is carried out on the spiral coil 304. The inner container 303 and the pipe ring 304 are made of materials with heat conductivity coefficient larger than 300 w/(m.k). The distance between the shell 301 and the inner container 303 is 0.5-1 m, and a heat insulating material 302 with a heat conductivity coefficient less than 0.12 w/(m.k) is filled between the shell 301 and the inner container 303, so that the heating effect of hot air is improved, and the seaweed can be fully pyrolyzed. The outer diameter of the inner container 303 is 3-5 m, and the inner diameter of the pipe ring 304 is matched with the outer diameter of the inner container 303. The inner diameter of the pipe ring 304 is 0.1-0.3 m, and the outer diameter of the pipe ring 304 is 0.3-0.5 m; the distance between the upper and lower adjacent pipelines of the pipe ring 304 is 0.45-0.75 m, so that the contact area between the pipe ring and the liner is increased as much as possible while the pipe ring is convenient to install and manufacture, and the heat transfer effect is enhanced.

The bottom of the pyrolysis furnace 3 is provided with a slag discharge hole 305, a slag discharge hole plug 306 is in threaded connection with the slag discharge hole 305, specifically, an external thread is arranged on the slag discharge hole plug 306, an internal thread is arranged on the slag discharge hole 305, the internal thread and the slag discharge hole plug are rotatably screwed, the diameter of the slag discharge hole plug 305 is 0.6-1 m, the slag discharge hole plug 305 is used for discharging slag regularly, and the sealing performance of the pyrolysis furnace 3 is ensured by the slag discharge hole plug 306. The side wall of the shell 301 is provided with an exhaust hole 308, the first stage cooling device 4 is communicated with the pyrolysis furnace 3 through the exhaust hole 308, and the inner side of the exhaust hole 308 is provided with a gas-solid separator 307 for preventing large granular solids from entering the first stage cooling device 4. The gas volatilized by pyrolysis of the seaweed in the pyrolysis furnace 3 is filtered through the gas-solid separator 307, is introduced into the first-stage cooling device 4 from the exhaust hole 308, and is subjected to secondary condensation through the second-stage cooling device 5, so that the biomass oil can be prepared, the biomass oil can be used for refining high-quality biodiesel, the biodiesel can be used as fuel, and the energy crisis under the condition can be relieved to a certain extent. The biomass carbon can be prepared by cleaning the gas-solid separator 307, the first-stage cooling device 4 and the second-stage cooling device 5 and collecting and sorting residues at the slag discharge hole 305, can replace expensive activated carbon, can be used as an adsorbent to adsorb and remove various smoke pollutants generated by a power plant, can be used for preparing biomass energy while effectively utilizing waste heat of a boiler of the power plant, and has important significance in the aspects of realizing energy conservation and emission reduction of the boiler, utilization of marine biological resources and the like.

Remaining tail gas lets in dust purification device 7 through third pipeline 14 after the condensation of second grade cooling device 5, can let in dust purification device 7 along with the flue gas that boiler 8 produced together and handle, dust purification device 7 is handled it, arrange to the external world through setting up second fan 11 at dust purification device 7 exit end afterwards, do not need additionally to install pyrolysis marine alga tail gas processing apparatus in the whole flow, and therefore, the cost is reduced, the reasonable application of resource has been accomplished, and the economic applicability is strong, and good market prospect is provided.

The above detailed description is only for the purpose of illustrating the practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. A system for pyrolyzing seaweed by using waste heat of a power plant boiler is characterized by comprising an air preheater (1), a pyrolysis furnace (3) and a pretreatment mechanism (6); the air preheater (1) is arranged in a flue (9), one end of the flue (9) is communicated with the boiler (8), and the other end of the flue is connected with a dust removal purification device (7); the outside air enters the air preheater (1) for heating; the outlet end of the air preheater (1) is provided with a gas diverter valve (2), and heated air flows into a first pipeline (12) and a second pipeline (13) through the gas diverter valve (2); the pretreatment mechanism (6) is communicated with the first pipeline (12), and the seaweed is treated by the pretreatment mechanism (6) and then enters the pyrolysis furnace (3) for pyrolysis;

the pyrolysis furnace (3) comprises an outer shell (301) and an inner container (303); a pipe ring (304) is arranged on the outer wall of the inner container (303), an inlet at the upper end of the pipe ring (304) is communicated with the second pipeline (13), and an outlet at the lower end of the pipe ring (304) is connected with the outside; the first-stage cooling device (4) is communicated with the pyrolysis furnace (3) through an exhaust hole (308) formed in the side wall of the shell (301); the first-stage cooling device (4) is communicated with the second-stage cooling device (5); the second-stage cooling device (5) is connected with the dust removal and purification device (7) through a third pipeline (14); and the flue gas generated by the boiler (8) and the tail gas generated by the pyrolysis furnace (3) are treated by the dust removal purification device (7) and then discharged to the outside.

2. A system for pyrolyzing seaweed using the afterheat of a power plant boiler in accordance with claim 1, wherein the inlet end of the air preheater (1) is provided with a first fan (10); and a second fan (11) is arranged at the outlet end of the dust removal and purification device (7).

3. A system for pyrolyzing seaweed by using the afterheat of a power plant boiler in accordance with claim 1, wherein said pretreatment mechanism (6) comprises a drying device, a pulverizing device and a material storage device which are arranged in sequence; one end of the crushing device is communicated with the drying device, and the other end of the crushing device is communicated with the material storage device; the first pipeline (12) is communicated with a drying device; the material storage device is communicated with the pyrolysis furnace (3).

4. A system for pyrolyzing seaweed by using the waste heat of a power plant boiler according to claim 1, wherein a heat insulating material (302) is filled between the outer shell (301) and the inner container (303), and the heat conductivity coefficient of the heat insulating material (302) is less than 0.12 w/(m-k); the distance between the outer shell (301) and the inner container (303) is 0.5-1 m; the outer diameter of the inner container (303) is 3-5 m.

5. The system for pyrolyzing seaweed by using the waste heat of the power plant boiler as claimed in claim 1, wherein the tube ring (304) is spiral, the inner diameter of the tube ring (304) is 0.1-0.3 m, and the outer diameter of the tube ring (304) is 0.3-0.5 m; the distance between adjacent pipelines of the pipe ring (304) is 0.45-0.75 m; the heat conductivity coefficients of the inner container (303) and the pipe ring (304) are more than 300 w/(m.k).

6. The system for pyrolyzing seaweed by using the waste heat of the power plant boiler as claimed in claim 1, wherein a slag discharge hole (305) is formed at the bottom of the pyrolysis furnace (3), and a slag discharge hole plug (306) is in threaded connection with the slag discharge hole (305); the diameter of the slag discharge hole (305) is 0.6-1 m; the inner side of the exhaust hole (308) is provided with a gas-solid separator (307).