CN105928375A - Built-in type header system - Google Patents

Abstract

The built-in header system includes header, header support, outlet pipe and outlet pipe sealing structure; the header and header support are arranged in the waste heat recovery device, and the furnace wall of the waste heat recovery device is a membrane wall structure; the collection The tank support is fixed on the furnace wall of the waste heat recovery device, and the header is supported and fixed by the header support; the outlet pipe communicates with the header, and the working medium in the header flows out or flows in through the outlet pipe; the outlet pipe is sealed The structure includes a pipe sleeve and a bellows; the pipe sleeve passes through the furnace wall of the waste heat recovery device and is fixed by welding; the lead-out pipe sleeve is inside the pipe sleeve, one end of the bellows is welded to the outer wall of the lead-out pipe, and the other end of the bellows One end is welded to the furnace wall of the waste heat recovery device. The invention has the advantages of ensuring uniform flow of materials, enhancing the safety of heat exchange working medium circulation, and being convenient for maintenance.

Description

Built-in header system

technical field

The invention relates to a built-in header system, which belongs to the technical field of thermal energy engineering and engineering thermophysics.

Background technique

Slag is a high-temperature, molten product in the metallurgical production process, such as liquid blast furnace slag, steel slag, copper slag, etc., which contains rich heat energy resources. For example, liquid blast furnace slag is a typical molten slag. The quenched blast furnace slag forms a large amount of glass phase amorphous substance, which has high hydration activity and is a high-quality raw material for the production of cement and other building materials. At the same time, the temperature of liquid blast furnace slag is between 1300°C and 1600°C, which has a high value of heat energy recovery and utilization. However, in the dry/semi-dry utilization process of slag for heat utilization, due to the high temperature of slag granulated particles, further waste heat recovery and utilization are still required, but the granulated slag has high hardness and is mainly composed of particulate matter. , the existing waste heat utilization settings need to be innovated to adapt to the characteristics of the heat medium.

After the liquid slag at 1000~1500℃ is granulated by dry or semi-dry granulation equipment, the high-temperature slag particles need to be further exchanged with waste heat recovery equipment to obtain sufficient heat utilization effect. For efficient heat exchange, superheaters or evaporators are often installed in waste heat recovery devices, and these heat exchangers are often equipped with headers. In the traditional heat exchanger header setting, the header is often set outside the furnace. Although it is convenient for construction and simple to fix, a large number of heat exchange tubes need to pass through the furnace wall, which is likely to affect the safety of the working fluid cycle.

Contents of the invention

Aiming at the deficiencies and defects of the prior art, the object of the present invention is to provide a built-in header system for heat exchange of high temperature and high hardness heat exchange medium.

Technical scheme of the present invention is as follows:

Built-in header system, the system includes header, header support, outlet pipe and outlet pipe sealing structure; the header and header support are arranged in the waste heat recovery device, and the furnace wall of the waste heat recovery device is a membrane wall structure The support of the header is fixed on the furnace wall of the waste heat recovery device, and the header is supported and fixed by the support of the header; the outlet pipe is connected with the header, and the working medium in the header flows out or flows in through the outlet pipe; The outlet pipe sealing structure includes a pipe sleeve and a bellows; the pipe sleeve passes through the furnace wall of the waste heat recovery device and is fixed by welding; the outlet pipe sleeve is inside the pipe sleeve, and one end of the bellows is welded to the outer wall of the outlet pipe , the other end of the bellows is welded to the furnace wall of the waste heat recovery device.

Another technical solution is:

Built-in header system, the system includes header, header support, outlet pipe and outlet pipe sealing structure; the header and header support are arranged in the waste heat recovery device, and the furnace wall of the waste heat recovery device is a membrane wall structure The support of the header is fixed on the furnace wall of the waste heat recovery device, and the header is supported and fixed by the support of the header; the outlet pipe is connected with the header, and the working medium in the header flows out or flows in through the outlet pipe; The sealing structure of the outlet pipe includes a pipe sleeve and a corrugated pipe; the pipe sleeve passes through the furnace wall of the waste heat recovery device; the outlet pipe sleeve is inside the pipe sleeve, and the outer end port of the sleeve pipe extending out of the furnace wall is welded with the outlet pipe; One end of the bellows is welded to the outer wall of the casing, and the other end of the bellows is welded to the furnace wall of the waste heat recovery device.

In the above two technical solutions, the header is a small header with a diameter of 76mm-273mm. The header includes an upper header and a lower header, and a tube bundle is connected between the upper header and the lower header.

In the above two technical solutions, the header support is a header bracket or a header support plate.

Compared with the prior art, the present invention has the following advantages: the built-in header can ensure the uniform flow of materials, enhance the safety of heat exchange working medium circulation, and is convenient for maintenance, so that the integrity and reliability of the process are further enhanced.

Description of drawings

Fig. 1 is a schematic diagram of the built-in header system involved in the present invention.

Fig. 2 is a system schematic diagram of another technical solution of the built-in header involved in the present invention.

In the figure: 1 - waste heat recovery device; 2 - tube bundle; 3 - upper header; 4 - lower header; 5 - outlet pipe; 6 - sewage pipe; 7 - header bracket; 8 - header support plate; 9 - pipe sleeve; 10 - bellows.

detailed description

The structure, principle and working process of the built-in header system provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

After the liquid slag at 1000~1500℃ is granulated by dry or semi-dry granulation equipment, the high-temperature slag particles need to be further exchanged with waste heat recovery equipment to obtain sufficient heat utilization effect. For efficient heat exchange, superheaters or evaporators are often installed in waste heat recovery devices, and these heat exchangers are often equipped with headers.

As shown in accompanying drawings 1 and 2, the built-in header system includes a header, a header support, an outlet pipe and an outlet pipe sealing structure. Both the header and the header supports are arranged in the waste heat recovery device 1, and the furnace wall of the waste heat recovery device 1 adopts a membrane wall structure.

The header is supported and fixed by the header support, and the header support is fixed on the furnace wall of the waste heat recovery device 1 . The header support is a header bracket 7 or a header support plate 8 . The header often includes an upper header 3 and a lower header 4 . For the upper header 3, the header bracket 7 is usually used to support and fix it. As for the lower header 4 connected to the inclined evaporator (also installed in the waste heat recovery device), it is necessary to weld the header support plate 8 on the lower header 4, and the header support plate 8 passes through the waste heat recovery device 1 Furnace wall fixed.

A tube bundle 2 is connected between the upper header 3 and the lower header 4, and the tube bundle is a convection tube bundle or an evaporation tube bundle. Since the header is built into the waste heat recovery device, in terms of structure and process optimization, the header is a small header with a diameter of 76mm~273mm. The small header corresponds to the small tube bundle. The number of tubes in the tube bundle 2 connected between the upper header 3 and the lower header 4 of the same section is 3~6, and the tube diameter of the tube bundle is 38mm~51mm. The outlet pipe 5 communicates with the header, and the working medium in the header flows out or flows into the header through the outlet pipe 5 . In the embodiment, the working fluid flows into the lower header 4 from the downcomer through the outlet pipe 5, and then flows through the tube bundle 2. During this process, it exchanges heat with the high-temperature medium outside the tube bundle to generate a steam-water mixture, which is collected through the upper header 3. After that, it flows out of the upper header 3 through the outlet pipe 5, enters the riser pipe and ascends into the steam drum provided on the top of the waste heat recovery device for steam-water separation. In order to ensure the safety of the working fluid system, the lower header 4 is provided with a blowdown pipe 6 .

Since the outlet pipe 5 passes through the furnace wall of the membrane wall structure, in order to ensure the sealing of the system and at the same time avoid stress damage caused by different thermal expansion and contraction of different materials, the outlet pipe 5 is provided with an outlet pipe sealing structure. The outlet pipe sealing structure includes a sleeve 9 and a bellows 10 .

One of the technical solutions is that the pipe sleeve 9 passes through the furnace wall of the waste heat recovery device, and is fixed on the furnace wall by welding the outer wall and the membrane wall. When the lead-out pipe 5 passes through the furnace wall, the lead-out pipe 5 is set in the pipe sleeve, which can expand and contract in the radial or axial direction of the pipe without causing thermal stress damage to the membrane-type fireplace wall; The pipes 5 are socketed, and the thermal stress generated by the pipe sleeves 9 also has room for relief. To ensure sealing, one end of the bellows 10 is welded to the outer wall of the outlet pipe 5, and the other end of the bellows 10 is welded to the furnace wall of the waste heat recovery device 1.

Another technical solution is that the pipe sleeve 9 passes through the furnace wall of the waste heat recovery device without welding. When the lead-out pipe 5 passes through the furnace wall, the lead-out pipe 5 is set in the pipe sleeve, and the outer end port of the furnace wall protruded from the sleeve 9 is welded and sealed with the lead-out pipe 5, so that the lead-out pipe and the sleeve are simultaneously in the pipe radial or axial To expand and contract without causing thermal stress damage to the membrane fireplace wall. To ensure sealing, one end of the bellows 10 is welded to the outer wall of the casing 9, and the other end of the bellows 10 is welded to the furnace wall of the waste heat recovery device 1 .

Different from the header arrangement of conventional heat exchange components, since the high-temperature material is slag particles with high hardness, the header is arranged in the waste heat recovery device 1 to ensure that the material flows evenly. At the same time, the upper header 3 and the lower header 4 are both arranged in the waste heat recovery device 1, which also avoids the unsafe problem caused by the numerous tube bundles 2 connected between the upper and lower headers passing through the membrane fireplace wall of the waste heat recovery device. The arrangement of small headers and small tube bundles not only ensures the uniform flow of materials, but also further enhances the safety of heat exchange working medium circulation and facilitates maintenance.

In one embodiment, the present invention is used as a header of an evaporator in a moving bed, and is applied to heat exchange of high-temperature slag after dry granulation of blast furnace slag.

Claims (6)

1. The most built-in header system, it is characterised in that: described system includes the support of header, header, fairlead (5) and draws tube seal structure；Described header and header support and are arranged in waste-heat recovery device (1), and waste-heat recovery device (1) furnace wall is membrane wall structure；Described header is supported and fixed on waste-heat recovery device (1) furnace wall, and described header is supported support by header and fixes；Described fairlead (5) connects with header, and in header, working medium is flowed out by fairlead (5) or flowed into；Described extraction tube seal structure includes pipe box (9) and bellows (10)；Described pipe box (9) is through the furnace wall of waste-heat recovery device (1), and passes through to be welded and fixed；Described fairlead (5) is enclosed within pipe box (9), and described bellows (10) one end is welded with fairlead (5) outer wall, and the bellows other end welds with waste-heat recovery device (1) furnace wall.
2. Built-in header system the most according to claim 1, it is characterised in that: a diameter of 76mm ~ 273 mm of described header；Described header includes upper collecting chamber (3) and lower header (4), and connecting between upper collecting chamber (3) and lower header (4) has tube bank (2).
3. Built-in header system the most according to claim 1, it is characterised in that: described header is supported for collecting cassette carrier (7) or header gripper shoe (8).
4. The most built-in header system, it is characterised in that: described system includes the support of header, header, fairlead (5) and draws tube seal structure；Described header and header support and are arranged in waste-heat recovery device (1), and waste-heat recovery device (1) furnace wall is membrane wall structure；Described header is supported and fixed on waste-heat recovery device (1) furnace wall, and described header is supported support by header and fixes；Described fairlead (5) connects with header, and in header, working medium is flowed out by fairlead (5) or flowed into；Described extraction tube seal structure includes pipe box (9) and bellows (10)；Described pipe box (9) is through the furnace wall of waste-heat recovery device (1)；Described fairlead (5) is enclosed within pipe box (9), and sleeve pipe (9) stretches out the external port of furnace wall and welds with fairlead (5)；Described bellows (10) one end is welded with sleeve pipe (9) outer wall, and the bellows other end welds with waste-heat recovery device (1) furnace wall.
5. Built-in header system the most according to claim 4, it is characterised in that: a diameter of 76mm ~ 273 mm of described header；Described header includes upper collecting chamber (3) and lower header (4), and connecting between upper collecting chamber (3) and lower header (4) has tube bank (2).
6. Built-in header system the most according to claim 4, it is characterised in that: described header is supported for collecting cassette carrier (7) or header gripper shoe (8).