CN217527836U - Nitrogen rotational flow sealing heat-preserving barrel for wet electric dust collector - Google Patents

Abstract

The utility model belongs to metallurgy, chemical industry equipment field specifically disclose a sealed heat-preserving container of nitrogen gas whirl for wet-type electrostatic precipitator, including the staving, be equipped with in the staving with the insulator of wet-type electrostatic precipitator intercommunication, be equipped with nitrogen gas whirl seal structure on the staving, nitrogen gas whirl seal structure includes nitrogen gas air supplement pipe, nitrogen gas drainage tube and stores the chamber staving with the nitrogen gas of nitrogen gas drainage tube intercommunication and includes staving upper portion and staving base, and the lateral wall that the chamber was stored to nitrogen gas is seted up a plurality of nitrogen gas confessions and is gone into in the staving base and form the drainage hole of whirl in the staving base, and the whirl flows to wet-type electrostatic precipitator direction. The utility model discloses having improved the position that nitrogen gas let in the staving, having optimized the nitrogen gas flow state, formed the nitrogen gas curtain in the staving, kept apart insulator and wet-type electrostatic precipitator, avoided the flue gas in the wet-type electrostatic precipitator to scurry in getting into the insulator to guarantee that the insulator is not polluted, guarantee its insulating properties, avoid the incident, eliminate the potential safety hazard.

Description

Nitrogen rotational flow sealing heat-preserving barrel for wet electric dust collector

Technical Field

The utility model relates to a metallurgical, chemical industry equipment field especially relates to a nitrogen gas whirl seals heat-preserving container for wet-type electrostatic precipitator.

Background

In metallurgical and chemical production processes, the flue gases produced typically contain large amounts of dust, water vapor or corrosive gases, such as blast furnace flue gases. In order to meet the increasingly strict environmental requirements, the flue gas must be correspondingly treated before being discharged so as to reach the emission standard.

At present, wet-type electric dust collectors are more applied in engineering to efficiently remove liquid drops, dust and the like in flue gas, so that deep purification of the flue gas is realized. In the wet-type electric dust collector, because the corona electrode system of the electric dust collector is a high-voltage charged body, a suspension supporting device of the wet-type electric dust collector must be well insulated from grounding parts such as a shell and an anode system, and the cathode system which ensures that the high-voltage charged body has enough discharge distance to each electric field generally has four heat-insulating barrels (insulator chambers), in order to prevent condensation and dewing of ceramic bottles (high-voltage insulators), a resistance heater is required to be arranged in each heat-insulating barrel, so that the temperature in each heat-insulating barrel is 20-30 ℃ higher than the dew point temperature of smoke. In general, nitrogen is introduced into the heat-insulating barrel, so that a certain amount of nitrogen (normal temperature) is filled in the outer area of the ceramic bottle to prevent air or smoke from entering the barrel; meanwhile, nitrogen is introduced into the inner side of the ceramic bottle through a drainage channel arranged on the ceramic bottle, so that airflow injection is formed to prevent dust-containing smoke in the electric dust collector from entering the inner side of the ceramic bottle.

When the wet-type electric dust collector is applied under the negative pressure working condition, the method and the structure can ensure that the phenomena of dust accumulation, creepage and the like do not occur on the inner side of the ceramic bottle; however, when the wet electric dust collector is located under the positive pressure working condition, the method and the structure have the potential that flue gas is possibly reversely blown into the ceramic bottle and even into the heat-insulating barrel due to rotational flow existing in the flow field, so that the ceramic bottle and the heat-insulating barrel are polluted to cause corresponding safety accidents, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings in the prior art, an object of the present invention is to provide a nitrogen cyclone sealed thermal insulation barrel for a wet electric dust collector, which is used for solving the problem that the flue gas in the prior art is likely to enter the thermal insulation barrel in a reverse-fleeing manner.

For realizing above-mentioned purpose and other relevant purposes, the utility model provides a sealed heat-preserving container of nitrogen gas whirl for wet-type electrostatic precipitator, including the staving, be equipped with the insulator with wet-type electrostatic precipitator intercommunication in the staving, be equipped with nitrogen gas whirl seal structure on the staving, nitrogen gas whirl seal structure includes nitrogen gas moisturizing pipe and nitrogen gas drainage subassembly, and nitrogen gas drainage subassembly includes the nitrogen gas drainage tube and stores the chamber with the nitrogen gas of nitrogen gas drainage tube intercommunication, the staving includes staving upper portion and staving base, and the lateral wall in nitrogen gas storage chamber is seted up a plurality of nitrogen gas flows and is gone into in the staving base and form the drainage hole of whirl in the staving base, and the whirl to wet-type electrostatic precipitator direction flows.

As the above, the utility model discloses a nitrogen gas whirl seals heat-preserving container for wet-type electrostatic precipitator has following beneficial effect: the utility model discloses in, utilize nitrogen gas drainage subassembly to let in nitrogen gas in to the staving base to formed the whirl to the flow of wet-type electrostatic precipitator direction in the staving base, the staving base region under the insulator medial surface forms the nitrogen gas curtain promptly, keep apart the insulator in the staving and wet-type electrostatic precipitator, avoid the flue gas in the wet-type electrostatic precipitator to scurry in getting into insulator (ceramic bottle), guarantee that insulator and staving upper portion are not polluted, thereby the insulating properties of guarantee insulator avoids the incident, eliminate the potential safety hazard.

And, the utility model discloses in inject the nitrogen gas flow more than or equal to nitrogen gas drainage tube's of nitrogen gas air supplement pipe nitrogen gas flow to ensure that the negative pressure zone that leads to after the whirl forms in the staving base can be filled by the nitrogen gas in the nitrogen gas air supplement pipe benefit insulator as far as possible, rather than the flue gas in the wet-type electrostatic precipitator is reversed scurried and is got into the insulator intussuseption.

Optionally, the nitrogen storage cavity is composed of an annular bottom plate, an annular cover plate, a cylinder and an inner peripheral wall of the barrel base.

In the scheme, an annular space is formed by utilizing the annular bottom plate, the annular cover plate, the cylinder and the inner peripheral wall of the barrel body base, the annular space is a nitrogen storage cavity, thus, the nitrogen gas drainage tube only needs to run through the lateral wall of staving base can store the chamber intercommunication with nitrogen gas to let in nitrogen gas and store the intracavity and store the drainage hole of chamber lateral wall through nitrogen gas and redistribute and flow in the staving base.

Optionally, the drainage holes are obliquely arranged along the circumferential direction of the nitrogen storage cavity at an angle smaller than the tangential angle of the circumference in the nitrogen storage cavity and are obliquely arranged along the axial direction of the nitrogen storage cavity towards the wet electric dust collector;

or, partial drainage holes are obliquely arranged along the circumferential direction of the nitrogen storage cavity by an angle smaller than the tangential angle of the circumference of the nitrogen storage cavity, and the other partial drainage holes are obliquely arranged along the axial direction of the nitrogen storage cavity towards the direction of the wet electric dust collector.

In this scheme, the drainage hole be provided with two kinds of modes, the first mode is that the drainage hole stores the circumferencial direction in chamber along nitrogen gas and sets up and simultaneously stores the axial in chamber to the slope of wet-type electrostatic precipitator direction along the nitrogen gas with the angle skew that is less than nitrogen gas storage intracavity circumference tangent angle, nitrogen gas in the chamber flows into the staving base through such drainage hole, the initial velocity that flows has downwards (wet-type electrostatic precipitator is located the below of staving base), the initial velocity that the circumference flows has simultaneously, consequently, can form the whirl of downflow in the staving base, form the nitrogen gas curtain in the staving base promptly, prevent that the flue gas in the wet-type electrostatic precipitator from scurrying and getting into in the insulator.

The second mode is that in a plurality of drainage holes, partial drainage hole is along the circumferencial direction of nitrogen gas storage chamber with the angle slope setting that is less than nitrogen gas storage intracavity circumference tangent angle, and first drainage hole is called as to this partial drainage hole, and another partial drainage hole is followed the axial of nitrogen gas storage chamber to wet-type electrostatic precipitator direction slope sets up, and second drainage hole is called as to this partial drainage hole. Like this, nitrogen gas in the first drainage hole inflow staving base has the initial velocity that circumference flows, and nitrogen gas in the second drainage hole inflow staving base has the initial velocity of downflow, and the nitrogen gas flow interact of two kinds of flow directions forms the whirl of downflow, forms the nitrogen curtain wall in the staving base promptly, prevents that the flue gas in the wet-type electrostatic precipitator from scurrying and getting into in the insulator.

Optionally, the plurality of drainage holes are divided into one group or two groups or three groups along the axial direction of the nitrogen storage cavity, and each group of drainage holes are uniformly distributed along the circumferential direction of the nitrogen storage cavity.

In this scheme, divide into a plurality of drainage holes a set of or two sets of or three groups to inject every group drainage hole along the circumferencial direction evenly distributed of nitrogen gas storage chamber, so, can form the whirl in the staving base better, thereby prevent better that the flue gas in the wet-type electrostatic precipitator from scurrying and get into in the insulator.

Optionally, the number of drainage holes in each group is more than three.

In this scheme, the quantity of having injectd every group drainage hole is more than three, and like this, the thrust point of air current has at least threely, can form the nitrogen gas whirl faster better.

Optionally, the number of the nitrogen gas drainage pipes is several, and the several nitrogen gas drainage pipes are uniformly distributed along the circumference of the nitrogen gas storage cavity.

In this scheme, when the quantity of nitrogen gas drainage tube was more, can make every drainage hole flow the nitrogen gas of the same pressure as far as possible.

Optionally, the nitrogen gas supply pipe is communicated with the upper part of the barrel body, a top end cover is arranged at the top of the insulator, and a plurality of vent holes used for communicating the inside of the insulator with the inside of the barrel body are formed in the top end cover.

In this scheme, in nitrogen gas air supplement pipe let in staving upper portion with nitrogen gas, nitrogen gas flows into in the insulator through the air vent on the top end cover to fill the negative pressure zone that produces in the staving base after the whirl forms, avoid the flue gas in the wet-type electrostatic precipitator to scurry in getting into the insulator.

Optionally, the communication position of the nitrogen gas supply pipe and the upper part of the barrel body is higher than the top end of the insulator.

In this scheme, when the intercommunication department on nitrogen gas air supplement pipe and staving upper portion was higher than the top of insulator, can flow into in the insulator through the air vent faster better through the nitrogen gas in the nitrogen gas air supplement pipe benefit staving upper portion.

Optionally, the plurality of vent holes are evenly distributed along the circumference of the top end cap.

In this scheme, a plurality of air vents are along the circumference evenly distributed of top end cover, so, can introduce the insulator with the nitrogen gas that the nitrogen gas moisturizing pipe let in more evenly.

Optionally, a heater is arranged in the barrel body.

In the scheme, the heater in the barrel body is used for heating air and the insulator in the barrel body, so that the temperature in the barrel body, particularly the temperature of the insulator, is 20-30 ℃ higher than the dew point temperature of smoke.

Drawings

Fig. 1 is a longitudinal sectional view of a nitrogen cyclone sealed heat-preserving container for a wet electric precipitator in an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged schematic view of portion B of FIG. 1;

FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

fig. 5 is an enlarged schematic view of a portion B in fig. 1 according to a second embodiment of the present invention;

fig. 6 isbase:Sub>A cross-sectional view along the directionbase:Sub>A-base:Sub>A in fig. 1 according to the second embodiment of the present invention.

Detailed Description

Reference numerals in the drawings of the specification include: the device comprises a barrel upper part 1, a barrel base 2, an insulator upper part 3, an insulator base 4, a wet electric dust collector 5, a top end cover 6, an air vent 601, a discharge electrode suspension pull rod 7, a heater 8, a nitrogen gas supplementing pipe 9, a nitrogen gas drainage pipe 10, a nitrogen gas storage cavity 11, a drainage hole 12, a first drainage hole 1201 and a second drainage hole 1202.

The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein.

It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship between the terms may be changed or adjusted without substantial technical changes.

Example one

As shown in fig. 1-4, the present embodiment provides a nitrogen cyclone sealed insulation barrel for a wet electric dust collector, which includes a barrel body, wherein a heater 8 and an insulator communicated with the wet electric dust collector 5 are disposed in the barrel body, and a nitrogen cyclone sealed structure is disposed on the barrel body. The barrel body comprises a barrel body upper part 1 and a barrel body base 2, and the insulator comprises an insulator upper part 3 and an insulator base 4.

The insulator adopts ceramic material to make, and insulator upper portion 3 is the toper structure, places in the staving through insulator base 4, and the inner space of insulator upper portion 3 communicates with staving base 2 and wet-type electrostatic precipitator 5's inside, and consequently, the flue gas in the wet-type electrostatic precipitator 5 is in the insulator of the most likely upwards inflow under the malleation operating mode. The top of insulator upper portion 3 is equipped with top end cover 6, and the centre of a circle department of top end cover 6 is equipped with the through-hole, and discharge electrode suspends pull rod 7 in midair and runs through the through-hole of top end cover 6 and installs on top end cover 6 through the nut. Referring to fig. 2, the top end cover 6 is further provided with a plurality of vent holes 601 for communicating the inside of the insulator with the inside of the barrel, and the plurality of vent holes 601 are uniformly distributed along the circumference of the top end cover 6, so that nitrogen in the upper portion 1 of the barrel is uniformly introduced into the upper portion 3 of the insulator, in this embodiment, the number of the vent holes 601 is six. The heater 8 is arranged on the peripheral wall of the insulator base 4, in the embodiment, the heater 8 adopts an electric heating belt, so that the temperature in the barrel body is ensured to be 20-30 ℃ higher than the dew point temperature of the smoke. Still be equipped with heat preservation and observation window on the lateral wall of staving, the setting of heat preservation and observation window is prior art, and this place is no longer repeated.

Staving base 2 fixed mounting is on wet-type electrostatic precipitator 5, specifically, staving base 2's shape is the cylinder shape, and the bottom of staving base 2 and wet-type electrostatic precipitator 5's shell fixed connection, this fixed connection mode can be the welding, also can be through bolt, sealing washer sealing connection. In this embodiment, the barrel base 2 is welded to the outer casing of the wet electric dust collector 5.

The nitrogen rotational flow sealing structure comprises a nitrogen air supplementing pipe 9 and a nitrogen drainage assembly, the nitrogen air supplementing pipe 9 is communicated with the barrel body upper portion 1, the communicating position of the nitrogen air supplementing pipe 9 and the barrel body upper portion 1 is higher than the top end cover 6 of the insulator upper portion 3, the number of the nitrogen air supplementing pipes 9 is one or more, and in the embodiment, the number of the nitrogen air supplementing pipes 9 is one.

Nitrogen gas drainage subassembly includes nitrogen gas drainage tube 10 and stores chamber 11 with the nitrogen gas of nitrogen gas drainage tube 10 intercommunication, and nitrogen gas is stored chamber 11 and is become by annular bottom plate, annular apron, drum and barrel base 2's internal perisporium, combines fig. 3 and fig. 4 to show, and a plurality of confessions nitrogen gas are offered to the internal circumference wall (drum) that nitrogen gas stored chamber 11 and flow into in barrel base 2 and form the drainage hole 12 of whirl in barrel base 2, and the whirl flows downwards. The thickness of the cylinder is not less than 10mm, so that the length of the drainage hole 12 is long enough, and the nitrogen flowing out through the drainage hole 12 forms a rotational flow in the barrel base 2. In this example, the thickness of the cylinder was 15mm. The drainage holes 12 are obliquely arranged along the circumferential direction of the nitrogen storage cavity 11 at an angle smaller than the tangential angle of the inner circumference (the inner circumference of the cylinder) of the nitrogen storage cavity 11, and meanwhile, the drainage holes 12 are inclined downwards along the axial direction of the nitrogen storage cavity 11, the drainage holes 12 are divided into one group or two groups or three groups along the axial direction of the nitrogen storage cavity 11, the number of the drainage holes 12 in each group is more than three, and the drainage holes 12 in each group are uniformly distributed along the circumferential direction of the nitrogen storage cavity 11. In this embodiment, the drainage holes 12 are divided into two groups in the axial direction of the nitrogen storage chamber 11, and the number of the drainage holes 12 in each group is six. So, nitrogen gas in nitrogen gas drainage component entering staving base 2 has the downward initial velocity in tangential to form the nitrogen gas whirl, and guide the gas flow in staving base 2 through the nitrogen gas whirl, optimize the nitrogen gas flow field, form the nitrogen gas curtain. The nitrogen curtain wall in the embodiment means that nitrogen is formed on the cross section of the barrel body base 2 for blocking, namely the cross section is filled with nitrogen as much as possible to block other gases from passing through, so that the nitrogen sealing effect is achieved.

The number of the nitrogen draft tubes 10 is one or more than two, and the more than two nitrogen draft tubes 10 are uniformly distributed along the circumference of the nitrogen storage cavity 11. In this embodiment, the number of the nitrogen draft tubes 10 is one. The nitrogen flow rate of the nitrogen supplementing pipe 9 is equal to or higher than that of the nitrogen draft pipe 10. In this embodiment, the nitrogen flow rate of the nitrogen make-up pipe 9 is equal to that of the nitrogen draft pipe 10.

When the wet electric dust collector is actually used, the upper part 1 of the bucket body is hermetically connected with the bucket body base 2, the inner diameter of the upper part 1 of the bucket body is generally 800-1000mm, the inner diameter of the bucket body base 2 is correspondingly 400-500mm, and the bottom end of the bucket body base 2 is connected with the shell of the wet electric dust collector 5.

The pressure of the nitrogen input by the nitrogen supplementing pipe 9 is not lower than 50kPa, and considering that the temperature control of the inner and outer spaces of the heat-preserving barrel is influenced by the excessive flow of the nitrogen, the flow of the nitrogen supplementing pipe 9 is not higher than 50m ³ The nitrogen in the upper part 1 of the barrel flows down through the vent holes 601 of the top end cover 6 as shown by the arrows in fig. 1.

The nitrogen pressure and the nitrogen flow input by the nitrogen drainage component are the same as those of the nitrogen air supplement pipe 9, so that an effective nitrogen curtain wall is formed in the barrel body base 2. Through air vent 601 inflow insulator upper portion 3 interior nitrogen gas, under the drainage effect of the nitrogen gas whirl that the nitrogen gas drainage subassembly formed, form stronger nitrogen gas curtain with the nitrogen gas of nitrogen gas drainage subassembly input together in staving base 2, thereby flue gas in the separation wet-type electrostatic precipitator 5 gets into in insulator upper portion 3, the sealed effect of nitrogen gas has been guaranteed, avoid 3 inside wall dewings in staving upper portion 1 and insulator upper portion, thereby ensure the insulating properties of insulator, avoid the incident, eliminate the potential safety hazard. The specific nitrogen flow conditions are shown by the arrows in fig. 1-4.

To sum up, the nitrogen cyclone sealing heat-preserving container for the wet-type electric precipitator 5, which is provided by the embodiment, has the advantages of simple overall structure, convenience in installation, low cost and good sealing effect, can effectively isolate the insulator from the wet-type electric precipitator 5, avoids the smoke in the wet-type electric precipitator 5 from flowing back into the insulator, and ensures that the insulator is not polluted, thereby ensuring the insulating property of the insulator, avoiding the occurrence of safety accidents and eliminating potential safety hazards.

Example two

The present embodiment is different from the first embodiment only in that: the arrangement of the drainage holes in this embodiment is slightly different from that in the first embodiment, specifically, as shown in fig. 5 and 6, one of the two sets of drainage holes in this embodiment is obliquely arranged in the circumferential direction of the nitrogen storage chamber 11 at an angle smaller than the tangential angle of the inner circumference of the nitrogen storage chamber 11 (the inner circumference of the cylinder), referred to as a first drainage hole 1201, the other set of drainage holes is obliquely arranged in the axial direction of the nitrogen storage chamber 11, referred to as a second drainage hole 1202, and the second drainage hole 1202 is located above the first drainage hole 1201.

So, through the nitrogen gas of first drainage hole 1201 inflow in staving base 2, have the initial velocity that circumference flows, and through the nitrogen gas of second drainage hole 1202 inflow staving base 2, have the initial velocity that flows downwards, the nitrogen gas stream interact of two kinds of flow directions, form the whirl of downward flow, can form the nitrogen gas curtain with the nitrogen gas that flows into in insulator upper portion 3 through air vent 601 in staving base 2, prevent that the flue gas in the wet-type electrostatic precipitator 5 from scurrying and getting into in the insulator.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. It will be apparent to those skilled in the art that modifications and variations can be made to the above-described embodiments without departing from the spirit and scope of the invention, and it is intended that all equivalent modifications and variations be covered by the appended claims without departing from the spirit and scope of the invention.

Claims (8)

1. The utility model provides a nitrogen gas whirl seals heat-preserving container for wet-type electrostatic precipitator, includes the staving, is equipped with the insulator that communicates with wet-type electrostatic precipitator in the staving, its characterized in that: the nitrogen cyclone sealing structure comprises a nitrogen replenishing pipe and a nitrogen drainage assembly, the nitrogen drainage assembly comprises a nitrogen drainage pipe and a nitrogen storage cavity communicated with the nitrogen drainage pipe, the barrel comprises an upper part of the barrel and a base of the barrel, a plurality of drainage holes for nitrogen to flow into the base of the barrel and form a cyclone in the base of the barrel are formed in the side wall of the nitrogen storage cavity, the cyclone flows towards the wet electric dust remover, the nitrogen storage cavity consists of an annular bottom plate, an annular cover plate, a cylinder and an inner peripheral wall of the base of the barrel, and the drainage holes are obliquely arranged along the circumferential direction of the nitrogen storage cavity at an angle smaller than the circumferential tangential angle in the nitrogen storage cavity and are obliquely arranged towards the wet electric dust remover along the axial direction of the nitrogen storage cavity; or, partial drainage holes are obliquely arranged along the circumferential direction of the nitrogen storage cavity at an angle smaller than the circumferential tangent angle in the nitrogen storage cavity, and the other partial drainage holes are obliquely arranged along the axial direction of the nitrogen storage cavity towards the direction of the wet electric dust collector.

2. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 1, which is characterized in that: the plurality of drainage holes are divided into one group or two groups or three groups along the axial direction of the nitrogen storage cavity, and each group of drainage holes are uniformly distributed along the circumferential direction of the nitrogen storage cavity.

3. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 2, characterized in that: the number of each group of drainage holes is more than three.

4. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 1, which is characterized in that: the quantity of nitrogen gas drainage tube is a plurality of, and a plurality of nitrogen gas drainage tubes are along the circumference evenly distributed of nitrogen gas storage chamber.

5. The nitrogen rotational flow sealing heat-preservation barrel for the wet electric dust remover as claimed in claim 1, characterized in that: the nitrogen gas supply pipe is communicated with the upper part of the barrel body, a top end cover is arranged at the top of the insulator, and a plurality of vent holes used for communicating the inside of the insulator with the inside of the barrel body are formed in the top end cover.

6. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 5, characterized in that: the communication position of the nitrogen gas supplementing pipe and the upper part of the barrel body is higher than the top end of the insulator.

7. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 5, characterized in that: the plurality of vent holes are evenly distributed along the circumference of the top end cover.

8. The nitrogen rotational flow sealing heat-preserving barrel for the wet electric dust collector as claimed in claim 1, which is characterized in that: a heater is arranged in the barrel body.

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