CN206130407U - Hot -air pipes axial compression compensator and have hot -air pipes of this compensator - Google Patents

Abstract

The utility model discloses an axial compression compensator for a hot air pipeline and a hot air pipeline with the compensator, belonging to the technical field of hot air pipeline compensators. The utility model comprises an outer tube, a positioning plate I, a positioning plate II, an axial limit rod and a flow guide tube, the outer tube is provided with a flow guide tube, and the flow guide tube is an air flow pipe with a tapered inner diameter, that is, along the The cross-sectional area of the guide tube decreases gradually in the direction of air flow, and the outer tube is provided with a positioning plate I and a positioning plate II correspondingly, and a bellows is provided on the outer tube between the positioning plate I and the positioning plate II , the axial limiting rod is installed on the positioning plate I and the positioning plate II, and positioning nuts are installed on both ends of the axial limiting rod. The utility model effectively overcomes the destructive effect of the blind plate force and internal heat expansion displacement on the hot air pipeline system, and improves the service life of the hot air pipeline.

Description

Axial compression compensator for hot air pipeline and hot air pipeline with the compensator

technical field

The utility model relates to the technical field of hot blast pipelines for blast furnace hot blast stoves, in particular to an axial compression compensator for hot blast pipelines and a hot blast pipeline with the compensator.

Background technique

Blast furnace ironmaking is an important link in steel production, and it is also the most widely used ironmaking process. During the blast furnace production process, iron ore, coke, and flux (limestone) for slagging are loaded from the top of the furnace, and from the lower part of the furnace along the circumference of the furnace. The tuyere blows in preheated air. At high temperature, the carbon in the coke is burned with the oxygen blown into the air to generate carbon monoxide, and the iron oxide in the ore is reduced to obtain molten iron during the ascension process in the furnace. Blast furnace smelting requires hot air with a sufficiently high temperature. During the blast furnace smelting process, the hot blast stove heats the blast to the required temperature and blows it into the blast furnace, which can significantly improve the benefit and efficiency of the blast furnace. The hot blast stove needs special hot blast pipelines to transport the high-temperature hot blast at 1100-1250°C into the blast furnace, and a blast furnace is generally equipped with 3-4 hot blast stove groups, and multiple hot blast stoves supply air to the blast furnace. A complex high-temperature, high-pressure hot air pipeline system is formed.

One end of the hot blast main pipe is vertically and horizontally connected to multiple hot blast branch pipes of the hot blast stove group, and the other end is horizontally connected to the hot blast surrounding pipe. Especially, the position of the hot air outlet of the top-fired hot blast stove is relatively high, resulting in the position of the hot blast branch pipe being 5-8 meters higher than the hot blast surrounding pipe , so that the hot blast main pipe and the hot blast surrounding pipe are not on the same level, the thermal expansion compensation and the limit device setting of the entire hot blast piping system are relatively complicated. The hot air pressure in the hot air pipe is generally 0.30-0.45Mpa, and a huge blind force will be generated at the blind plate or elbow. The hot air pipe and hot blast stove will also expand during the heating process, and the blind plate force and internal heat expansion displacement For hot air ducts. In order to eliminate the above effects, it is necessary to set up axial tension compensator to eliminate the thermal expansion displacement of hot blast stove, hot blast branch pipe and hot blast main pipe, and at the same time set a limit device to overcome and limit the blind end force of the hot blast pipe during the air supply process. displacement. The existing hot blast pipeline system is difficult to effectively eliminate the expansion displacement and the displacement caused by the blind end force during the hot blast stove working process, which can easily cause three types of damage to the hot blast pipeline: 1) damage to the refractory material at the hot blast outlet of the hot blast stove, 2) hot blast branch pipe and The upper refractory material of the trident pipe connected to the hot blast main pipe is damaged. 3) The refractory material of the vertical pipe connected to the hot blast main pipe is damaged, which eventually leads to redness and cracking of the shell of the above-mentioned parts of the hot blast pipe, seriously affecting the safe production of the blast furnace. Due to the high position of the hot air main pipe and the difficulty of maintenance, the stability of the hot air pipeline has become an important technical issue under the condition of high air temperature. In order to eliminate the above-mentioned problems, it is often necessary to install a compensator on the above-mentioned pipeline to compensate the expansion displacement of the hot-blast pipeline.

After retrieval, relevant technical solutions have been disclosed. For example, the name of the invention is: split bellows compensator (patent number: ZL2010207013071, application date: 2010-12-31), which includes bellows, end pipes connected The gasket plate on the inner surface of the terminal tube and the guide tube arranged inside the terminal tube and the bellows and in contact with one end of the gasket plate, wherein the bellows, the terminal tube, the gasket plate and the guide tube are all composed of the number Consisting of at least two single lobes that are equal and uniformly distributed in the cross section of the split-lobe corrugated compensator, the fluid flow direction is perpendicular to said cross section. In addition, the bidirectional diversion retest compensator (patent application number: 2016101126073, application date: 2016-02-29), which includes an end pipe, a corrugated pipe, a left diversion pipe, a right diversion pipe, a middle junction, a middle junction and two The end-to-end pipes are connected by bellows to form a compound bellows compensator structure; inside the bellows are provided a left diversion pipe and a right diversion pipe axially covering the bellows; However, the above-mentioned compensators can only achieve stretching or compression functions, and their supplementary functions are limited, so it is difficult to effectively compensate the expansion displacement of different forms of hot air pipes; this problem continues to improve.

Utility model content

1. The technical problems to be solved by the utility model

The purpose of the utility model is to overcome the problem that the hot blast pipeline compensator in the prior art is difficult to effectively compensate the expansion displacement of different forms of the hot blast pipeline, and provide a hot blast pipeline axial compression compensator and a hot blast pipeline with the compensator; A hot blast pipeline axial compression compensator realizes the axial compensation of the hot blast pipeline; a hot blast pipeline with an axial compression compensator effectively overcomes the damage of the blind plate force and internal thermal expansion displacement to the hot blast pipeline system role, thereby increasing the service life.

2. Technical solution

In order to achieve the above object, the technical solution provided by the utility model is:

A hot air pipeline axial compression compensator of the present utility model includes an outer pipe, a positioning plate I, a positioning plate II, an axial limit rod and a guide tube, the guide tube is arranged in the outer tube, and the guide tube The flow tube is an air flow duct with a tapered inner diameter, that is, the cross-sectional area of the flow guide tube gradually decreases along the direction of air flow, and the outer tube is correspondingly provided with a positioning plate I and a positioning plate II, and the positioning plate I and the positioning plate Bellows are arranged on the outer tube between the positioning plates II, the axial limiting rod is installed on the positioning plate I and the positioning plate II, and positioning nuts are installed on both ends of the axial limiting rod.

Preferably, a sliding retaining ring is provided at one end of the draft tube, and the sliding retaining ring is slidably matched with the inner wall of the outer tube, and a fixed retaining ring is provided at the other end of the draft tube, and the fixed retaining ring is in contact with the inner wall of the outer tube. The inner wall of the outer tube is firmly connected.

Preferably, two positioning nuts are arranged on the axial limit rod on the outside of the positioning plate I, and a transverse limit gasket is arranged between the positioning nut and the positioning plate I; the axial limit on the outside of the positioning plate II Two positioning nuts are arranged on the rod, and a transverse limit washer is arranged between the positioning nuts and the positioning plate II.

A hot air pipeline with an axial compression compensator of the utility model includes a steering joint, a vertical branch pipe, a horizontal branch pipe and a branch pipe positioning seat. The vertical branch pipe and the horizontal branch pipe are fixed on the branch pipe positioning seat. The top of the vertical branch pipe is connected to the hot blast stove through a steering joint, and the bottom of the vertical branch pipe is connected to the horizontal branch pipe, and the above-mentioned axial compression compensator is arranged on the horizontal branch pipe.

Preferably, a hot air valve is arranged on the horizontal branch pipe.

Preferably, the vertical branch pipe is provided with an axial tension compensator.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

(1) A hot air pipeline axial compression compensator of the present utility model is provided with a guide tube inside the outer tube, and the guide tube is an air flow channel with a tapered inner diameter, that is, the direction of the guide tube along the direction of airflow flow The cross-sectional area gradually decreases. The outer tube is provided with a positioning plate I and a positioning plate II correspondingly. The outer tube between the positioning plate I and the positioning plate II is provided with a bellows. The axial limit The rod is installed on the positioning plate I and the positioning plate II, and the two ends of the axial limit rod are installed with positioning nuts; the cross-sectional area of the guide tube is gradually reduced, and the hot air generates greater resistance in the guide tube. And the axial compression compensator produces a large pressure drop, which reduces the blind plate force of the hot air on the turning of the pipeline.

(2) A hot air pipeline axial compression compensator of the present utility model is provided with 2 positioning nuts, and the positioning nuts on the outside limit the force deviation of the positioning nuts on the inside; even when the positioning nuts on the inside become loose, the outside The positioning nut still has a good positioning and limiting effect, thus effectively ensuring the fixing effect of the positioning nut on the positioning plate I and the positioning plate II;

(3) A hot blast pipeline with an axial compression compensator of the utility model, the vertical branch pipe and the horizontal branch pipe are fixed on the branch pipe positioning seat, the top of the vertical branch pipe is connected with the hot blast stove through a steering joint, the bottom of the vertical branch pipe is connected with The horizontal branch pipes are connected, and the horizontal branch pipes are equipped with an axial compression compensator, which can eliminate the thermal expansion displacement of the hot blast stove and the hot air branch pipes, thereby effectively reducing the damage of the hot air pipes and improving the service life of the pipes.

Description of drawings

Fig. 1 is the structural representation of the axial compression compensator of the present utility model;

Fig. 2 is a schematic diagram of the connection between the horizontal branch unit and the vertical branch unit of the present invention.

Explanation of the symbols in the accompanying drawings:

110, hot blast stove; 121, steering joint; 122, vertical branch pipe; 131, horizontal branch pipe; 132, hot air valve; 140, branch pipe positioning seat;

220. Axial compression compensator; 230. Axial tension compensator;

310, positioning nut; 320, axial limit rod; 330, guide tube; 340, transverse limit gasket;

411, positioning board I; 412, positioning board II;

510, bellows; 521, sliding retaining ring; 522, fixed retaining ring.

detailed description

The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of example exemplary embodiments in which the invention can be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments can be implemented and the invention can be utilized without departing from the spirit and scope of the invention. Various changes. Therefore, the following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but only for illustration and not to limit the description of the features and characteristics of the present invention, in order to propose the implementation of the present invention. The best mode of the utility model is enough to enable those skilled in the art to implement the utility model. Accordingly, the scope of the invention is limited only by the appended claims.

The following detailed description and example embodiments of the invention can be better understood when taken in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.

Example 1

As shown in Figure 1-2, a hot air pipeline with an axial compression compensator of the present invention includes a steering joint 121, a vertical branch pipe 122, a horizontal branch pipe 131 and a branch pipe positioning seat 140, and the vertical branch pipe 122 1. The horizontal branch pipe 131 is fixed on the branch pipe positioning seat 140, the top of the vertical branch pipe 122 is connected with the hot blast stove 110 through the steering joint 121, the bottom of the vertical branch pipe 122 is connected with the horizontal branch pipe 131, and the horizontal branch pipe 131 is provided with There is an axial compression compensator 220; and a hot blast valve 132 is arranged on the horizontal branch pipe 131, and the hot blast valve 132 is used to control the opening or closing of the hot blast pipe, thereby controlling the air supply state of the hot blast stove 110 to the blast furnace. The other end of the horizontal branch pipe 131 The hot blast main pipe is connected with the hot blast surrounding pipe, and the hot blast from the hot blast stove 110 reaches the hot blast main pipe through the steering joint 121, the vertical branch pipe 122, and the horizontal branch pipe 131, and then enters the hot blast surrounding pipe from the hot blast main pipe to provide hot air for the blast furnace.

A hot air pipeline axial compression compensator of this embodiment includes an outer pipe, a positioning plate I 411, a positioning plate II 412, an axial limit rod 320, and a guide tube 330, and the guide tube 330 is arranged inside the outer tube. The pipe 330 is an airflow duct with a tapered inner diameter, that is, the cross-sectional area of the guide pipe 330 gradually decreases along the direction of air flow; one end of the guide pipe 330 is provided with a sliding retaining ring 521, and the sliding retaining ring 521 is connected to the The inner wall of the outer tube is slidably fitted. The sliding retaining ring 521 is arranged on the side of the air supply, that is, the windward side of the hot air. The other end of the draft tube 330 is provided with a fixed retaining ring 522, which is fixed to the inner wall of the outer pipe. even.

The outer tube of the axial compression compensator 220 in this embodiment is correspondingly provided with a positioning plate I 411 and a positioning plate II 412, the positioning plate I 411 and the positioning plate II 412 are circular; the positioning plate I 411 and the positioning plate II 412 A bellows 510 is arranged on the outer tube between them; the above-mentioned axial limit rod 320 is installed on the positioning plate I 411 and the positioning plate II 412, and the two ends of the axial limit rod 320 are equipped with positioning nuts 310, That is, a positioning nut 310 is installed on the axial limit rod 320 on the outside of the positioning plate I 411 and the positioning plate II 412 to limit the movement of the positioning plate I 411 and the positioning plate II 412 toward the direction away from each other, and the positioning plate I 411 and the positioning plate II 412 can move toward each other along the axial limit rod 320. The outer side is the side where the positioning plate I 411 and the positioning plate II 412 are away from each other, and the inner side is the side where they are approaching each other. Two positioning nuts 310 are arranged on the axial limit rod 320 on the outside of the positioning plate I 411, and a transverse limit washer 340 is arranged between the positioning nuts 310 and the positioning plate I 411; the shaft outside the positioning plate II 412 Two positioning nuts 310 are arranged on the limiting rod 320 , and a transverse limiting washer 340 is arranged between the positioning nuts 310 and the positioning plate II 412 . During the hot air supply process, the hot air flows into the guide tube 330. Since the cross-sectional area of the guide tube 330 gradually decreases, the hot air generates greater resistance in the guide tube 330, and the sliding retaining ring 521 is arranged on the side of the air supply. , so that the sliding retaining ring 521 is compressed along the flow direction of the hot air, and a large pressure drop is generated in the axial compression compensator 220, which reduces the blind force of the hot air on the pipe turning, thereby effectively reducing the pressure of the hot air pipe. The degree of damage and improve the service life of the pipeline. Positioning nuts 310 are installed at both ends of the axial limit rod 320, since the hot blast stove 110 is an alternating process of air supply and heat storage, each time the process of heat storage and air supply is completed, the axial compression compensator 220 All will complete the cyclic process of compression and recovery, and this process will inevitably cause collisions with the positioning nut 310, and such tiny collisions will easily cause the positioning nut 310 and the positioning plate I 411 or positioning plate II 412 to loosen.

In this embodiment, two positioning nuts 310 are arranged on the side of the axial limiting rod 320 close to the positioning plate I 411, and a transverse limiting gasket 340 is arranged between the positioning nuts 310 and the positioning plate I 411. The spacer 340 is closely attached to the positioning plate I411; the axial limit rod 320 is provided with two positioning nuts 310 on the side close to the positioning plate II412, and a lateral limit is set between the positioning nuts 310 and the positioning plate II412 Gasket 340, and the lateral limit gasket 340 is in close contact with the positioning plate II 412. The transverse limit washer 340 weakens the impact on the positioning nut 310 in the process of heat storage and air supply, thereby weakening the impact of the impact force on the positioning nut 310, and because there are two positioning nuts 310, the outer positioning nut 310 limits the displacement of the inner positioning nut 310 under force; even when the inner positioning nut 310 is loose, the outer positioning nut 310 still has a better positioning and limiting effect, thereby effectively ensuring that the positioning nut 310 is aligned with the positioning plate. I 411 and positioning plate II 412 have a fixed effect.

Example 2

A hot air pipeline with an axial compression compensator in this embodiment is basically the same as that in Embodiment 1, except that: the vertical branch pipe 122 is provided with an axial tension compensator 230, that is, between the steering joint 121 and the The vertical branch pipe 122 between the horizontal branch pipes 131 is provided with an axial tension compensator 230, and the axial tension compensator 230 includes an outer pipe, a positioning plate I 411, a positioning plate II 412, and an axial limit rod 320 And the guide tube 330, the outer tube is provided with a guide tube 330, the guide tube 330 is an air flow pipe with a tapered inner diameter, that is, the cross-sectional area of the guide tube 330 gradually decreases along the direction of the air flow, that is The cross-sectional area of the draft pipe 330 near the hot blast stove 110 is larger than the cross-sectional area of the side away from the hot blast stove 110 . One end of the guide pipe 330 is provided with a sliding retaining ring 521, and the sliding retaining ring 521 is arranged on the side of the hot air supply. During the air supply process of the hot blast stove 110, the cross-sectional area of the guide pipe 330 gradually increases along the direction of the air flow. decrease, so that the axial tension compensator 230 produces greater resistance, and the sliding retaining ring 521 moves to the side of the fixed retaining ring 522 under the action of the hot air pressure, that is, the lateral direction of the draft tube 330 near the sliding retaining ring 521 The cross-sectional area is larger than the side close to the fixed retaining ring 522; thus, a larger pressure drop is generated in the axial tension compensator 230, thereby reducing the blind plate force of the hot air on the pipe turning, and weakening the blind plate force on the vertical The damage at the joint between the branch pipe 122 and the horizontal branch pipe 131; the sliding retaining ring 521 is slidingly fitted with the inner wall of the outer pipe, and the other end of the guide tube 330 is provided with a fixed retaining ring 522, which is in contact with the inner wall of the outer pipe. Fixed connection.

Correspondingly, the outer tube of this implementation is provided with a positioning plate I 411 and a positioning plate II 412, and the outer tube between the positioning plate I 411 and the positioning plate II 412 is provided with a bellows 510, and the axial limit rod 320 is installed on the positioning plate I 411 and the positioning plate II 412, the positioning nut 310 is arranged on the axial limit rod 320 inside the positioning plate I 411 and the positioning plate II 412, and the positioning plate I411 and the positioning plate II 412 can move toward the direction away from each other along the axial limit rod 320 Directional movement, ie axial tension compensator 230 can only produce tension movement. The axial limit rod 320 inside the positioning plate I 411 is provided with a positioning nut 310, and a transverse limit washer 340 is arranged between the positioning nut 310 and the positioning plate I 411; the axial limit rod 320 inside the positioning plate II 412 A positioning nut 310 is arranged on the top, and a transverse limit washer 340 is arranged between the positioning nut 310 and the positioning plate II 412 .

Since the vertical branch pipe 122 is provided with an axial tension compensator 230, the hot blast stove 110 is prone to thermal expansion and "grows taller" after being heated. Move towards the direction away from each other, so as to compensate the length of the hot blast pipe, and prevent the relative displacement of the vertical branch pipe 122 and the hot blast stove 110 from causing stress damage.

More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments but includes modifications, modifications, Any and all embodiments are omitted, combined (eg, between various embodiments), adapted, and/or substituted. The definitions in the claims are to be interpreted broadly according to the language used in the claims and not limited to the examples described in the foregoing detailed description or during the prosecution of this application, which examples should be considered non-exclusive. For example, in the present invention, the term "preferably" is not exclusive, and here it means "preferably, but not limited to". Any steps recited in any method or process claims may be performed in any order and are not limited to the order presented in the claims. Accordingly, the scope of the present invention should be determined only by the appended claims and their legal equivalents, rather than by the description and examples given above.

Claims (6)

1. a kind of hot air duct is compressed axially compensator, it is characterised in that：Including outer tube, location-plate I (411), location-plate II (412), axial limiting bar (320) and mozzle (330), described mozzle (330) is arranged in outer tube, above-mentioned mozzle (330) it is the airflow line that internal diameter is tapered, i.e., the cross-sectional area along the direction mozzle (330) of air current flow is gradually reduced, It is corresponding on described outer tube to be provided with location-plate I (411) and location-plate II (412), location-plate I (411) and location-plate II (412) be provided with corrugated tube (510) on the outer tube between, described axial limiting bar (320) be installed on location-plate I (411) and On location-plate II (412), location nut (310) is installed on the two ends end of axial limiting bar (320).

2. a kind of hot air duct according to claim 1 is compressed axially compensator, it is characterised in that：Described mozzle (330) one end end is provided with slip back-up ring (521), and the slip back-up ring (521) is slidably matched with outer tube wall, and described leads Flow tube (330) other end end is provided with fixed back-up ring (522), and fixed back-up ring (522) is fixedly connected with outer tube wall.

3. a kind of hot air duct according to claim 2 is compressed axially compensator, it is characterised in that：Described location-plate I (411) 2 location nuts (310), and location nut (310) and location-plate I are provided with the axial limiting bar (320) on the outside of (411) cross spacing pad (340) is provided between；2 are provided with axial limiting bar (320) on the outside of location-plate II (412) Individual location nut (310), is provided with cross spacing pad (340) between location nut (310) and location-plate II (412).

4. a kind of with the hot air duct for being compressed axially compensator, it is characterised in that：Including steering knuckle (121), vertical arm (122), horizontal branch pipe (131) and arm positioning seat (140), described vertical arm (122), horizontal branch pipe (131) are fixed on On arm positioning seat (140), described vertical arm (122) top is connected by steering knuckle (121) with air stove (110), Vertical arm (122) bottom is connected with horizontal branch pipe (131), arranges just like claim on described horizontal branch pipe (131) Compensator (220) is compressed axially described in any one of 1-3.

5. according to claim 4 a kind of with the hot air duct for being compressed axially compensator, it is characterised in that：Described water Hot-blast valve (132) is provided with flat arm (131).

6. according to claim 5 a kind of with the hot air duct for being compressed axially compensator, it is characterised in that：Described is perpendicular Axial tension compensator (230) is provided with allotment pipe (122).