CN209763039U - Spherical steam accumulator capable of generating superheated steam - Google Patents

Abstract

The utility model relates to a spherical steam accumulator capable of generating superheated steam, which comprises a spherical tank body, on which a water inlet pipe and a heating device are arranged, and a first steam outlet pipe, a second outlet pipe Steam pipe and low-pressure steam inlet pipe. The spherical tank is equipped with a heat exchange unit for heat exchange with high-temperature water in the tank. The outlet end of the first steam outlet pipe communicates with the inlet end of the low-pressure steam inlet pipe through a pressure regulating valve group. The pipe and the second steam outlet pipe are respectively connected with the inlet and outlet of the heat exchange unit. By setting the pressure regulating valve group, low-pressure steam inlet pipe and heat exchange unit, after adjusting the pressure of the outlet steam to the required pressure, and then returning the pressure-regulated steam to the spherical tank to exchange heat with the steam in the tank, superheat can be obtained Steam, suitable for the vacuum pump of the RH or VD refining system of the steelmaking plant, the spherical steam accumulator has a simple structure, is easy to manufacture and is convenient to install.

Description

Spherical steam accumulator capable of generating superheated steam

technical field

The utility model belongs to the technical field of steam utilization, in particular to a spherical steam accumulator capable of generating superheated steam.

Background technique

The converter vaporization cooling waste heat boiler absorbs the heat in the converter flue gas through cooling water vaporization, and generates saturated steam for users. Flue gas is only produced during oxygen blowing smelting in the converter, so the heat source of the flue gas is generated intermittently, and the steam generated by the waste heat boiler is also intermittent, and the steam production fluctuates greatly during the oxygen blowing period of the converter. The device can change intermittently generated steam into continuous and stable steam output for continuous use by users.

The vacuum pump of the RH or VD refining system in the steelmaking plant needs to use steam with a superheat of 10°C to 20°C as the steam source, and the use of steam is intermittent. The steam pressure parameters used are generally 1.0MPa and 190°C. The steam parameters from the heat accumulator are: pressure 1.0MPa, temperature 180°C (saturation temperature). In order to meet the requirements of vacuum pumps, fast fuel oil (gas) boilers specially used for vacuum pumps were generally installed earlier. This type of boiler must be hot standby at any time, and can quickly start to reach the rated evaporation, and this type of boiler is basically produced abroad. Equipment The investment is expensive and the operating system is complicated.

With the gradual increase in energy prices, steel mills have shifted their attention to the steam source of the vacuum pump to the saturated steam generated by the converter waste heat boiler itself. Provided for vacuum pump use.

Utility model content

The embodiment of the utility model relates to a spherical steam accumulator capable of generating superheated steam, which can at least solve some defects of the prior art.

The embodiment of the utility model relates to a spherical steam accumulator capable of generating superheated steam, comprising a spherical tank body, the spherical tank body is provided with a water inlet pipe and a heating device, and the top of the spherical tank body is provided with a first outlet A steam pipe, a second steam outlet pipe and a low-pressure steam inlet pipe. The spherical tank is provided with a heat exchange unit for exchanging heat with the high-temperature water in the tank. The outlet end of the first steam outlet pipe is connected to the The inlet port of the low-pressure steam inlet pipe is connected, and the low-pressure steam inlet pipe and the second steam outlet pipe are respectively connected with the inlet and outlet of the heat exchange unit.

As one of the embodiments, the heat exchange unit is a heat exchange tube.

As one of the embodiments, the heat exchange tubes are serpentinely arranged in the spherical tank.

As one of the embodiments, the heat exchange tubes are bent sequentially from top to bottom in the spherical tank to form multiple serpentine layers.

As one of the embodiments, the heat exchange tubes are finned tubes.

As one of the embodiments, the heat exchange tube is supported and arranged in the spherical tank by a bracket.

As one of the embodiments, the heat exchange unit is connected with a drain pipe, and the drain pipe extends to pass through the bottom of the spherical tank.

As one of the embodiments, the heating device includes a high-pressure steam inlet pipe pierced at the bottom of the spherical tank and a heating pipe arranged in the spherical tank and communicated with the high-pressure steam inlet pipe. The heat pipe is provided with a plurality of steam injection holes.

As one of the embodiments, the axes of each of the heating tubes are parallel to the horizontal direction, and each of the steam injection holes is opened on the upper part of the heating tubes.

As one of the embodiments, a gas-liquid separation unit is provided at the inlet of the first steam outlet pipe.

Embodiments of the utility model have at least the following beneficial effects:

The spherical steam accumulator provided by the utility model adjusts the pressure of the outlet steam to the required pressure by setting the pressure regulating valve group, the low-pressure steam inlet pipe and the heat exchange unit, and then returns the steam after pressure adjustment to the spherical tank. Exchange heat with the steam in the tank to obtain superheated steam, which is suitable for the vacuum pump of the RH or VD refining system in the steelmaking plant. The spherical steam heat accumulator is simple in structure, easy to manufacture and easy to install. Compared with the horizontal cylindrical heat accumulator, under the same volume, the spherical steam heat accumulator provided by this embodiment has a smaller footprint. Complex accumulator attachment system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is a schematic structural view of a spherical steam accumulator capable of producing superheated steam provided by an embodiment of the present invention;

Fig. 2 is a sectional view along A-A in Fig. 1 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1, the utility model embodiment provides a kind of spherical steam accumulator that can produce superheated steam, comprises spherical tank body 1, and described spherical tank body 1 is provided with water inlet pipe 11 and heating device, and described spherical tank body The top of the body 1 is provided with a first steam outlet pipe 2, a second steam outlet pipe 5 and a low-pressure steam inlet pipe 3. The spherical tank body 1 is provided with a heat exchange unit for exchanging heat with high-temperature water in the tank. The outlet end of a steam outlet pipe 2 communicates with the inlet end of the low-pressure steam inlet pipe 3 through a pressure regulating valve group 4, and the low-pressure steam inlet pipe 3 and the second outlet pipe 5 are respectively connected to the inlet of the heat exchange unit. Export connections.

Among them, in this embodiment, for the use requirements of the vacuum pump used in the RH or VD refining system of the steelmaking plant, the high-pressure end of the above-mentioned pressure regulating valve group 4 is connected to the first steam outlet pipe 2, and the low-pressure end of the pressure regulating valve group 4 It is connected with the low-pressure steam inlet pipe 3, that is, the pressure regulating valve group 4 performs decompression operation. Pressure regulating valve group 4 is existing equipment, can be purchased by the market, and its specific structure is not repeated here.

The spherical steam accumulator provided in this embodiment, by setting the pressure regulating valve group 4, the low-pressure steam inlet pipe 3 and the heat exchange unit, adjusts the pressure of the outlet steam to the required pressure, and then returns the steam after pressure adjustment to the spherical heat accumulator. The tank 1 exchanges heat with the steam in the tank 1 to obtain superheated steam, which is suitable for the vacuum pump of the RH or VD refining system of the steelmaking plant. The spherical steam heat accumulator is simple in structure, easy to manufacture and easy to install. Compared with the horizontal cylindrical heat accumulator, under the same volume, the spherical steam heat accumulator provided by this embodiment has a smaller footprint. Complex accumulator attachment system.

It is easy to understand that the above-mentioned heat exchange unit is an indirect heat exchange device, as shown in Fig. 1 and Fig. 2, preferably adopting a tubular heat exchange structure, that is, the heat exchange unit is a heat exchange tube 6, which is easily Layout and installation.

The above-mentioned heat exchange tubes 6 can be plain tubes or finned tubes, preferably finned tubes, which have a better heat exchange effect.

The above-mentioned heat exchange tubes 6 can be arranged in a serpentine shape or other arrangements in the spherical tank body 1. In this embodiment, the serpentine arrangement is preferably used, which can increase the heat exchange area and prolong the steam exchange in a limited space. thermal stroke, thereby improving the heat transfer effect.

The above-mentioned heat exchange tubes 6 can be of a single-layer structure or a multi-layer structure. The single-layer structure means that the heat exchange tubes 6 are bent in a serpentine shape in the same horizontal plane. In a single-layer structure, the outlet end of the upper structure communicates with the inlet end of the lower structure, the inlet end of the uppermost structure is connected with the above-mentioned low-pressure steam inlet pipe 3, and the outlet end of the lowermost structure is connected with the above-mentioned second steam outlet pipe 5. In this embodiment, the heat exchange tube 6 with a multi-layer structure is adopted to achieve a better heat exchange effect, that is, the heat exchange tube 6 is bent sequentially from top to bottom in the spherical tank body 1 to form a multi-layer serpentine layer.

Further preferably, the heat exchange tube 6 is supported and arranged in the spherical tank body 1 by a bracket 7 . The bracket 7 is preferably one end welded on the inner wall of the spherical tank body 1, and the other end rests on a support provided on the inner wall of the spherical tank body 1 and is formed as a thermal expansion free end, which can avoid the problem of deformation of the bracket 7 due to thermal expansion. .

Further preferably, as shown in Figure 1, the heat exchange unit is connected with a drain pipe 9, and the drain pipe 9 extends to pass through the bottom of the spherical tank 1, and the drain pipe 9 can discharge the liquid moisture in the heat exchange unit , to prevent water hammer. It is easy to understand that for the above-mentioned heat exchange unit of the heat exchange tube 6 type, the drain tube 9 is connected to the lowest point of the heat exchange tube 6 .

The structure of the above-mentioned heating device is optimized as follows:

It can be understood that all heating devices in the prior art are applicable to this embodiment. Preferably, the heating device includes a high-pressure steam inlet pipe 10 pierced at the bottom of the spherical tank body 1 and a heating pipe 8 arranged in the spherical tank body 1 and communicating with the high-pressure steam inlet pipe 10, The heating pipe 8 is provided with a plurality of steam injection holes. The heating pipe 8 is directly sprayed with small holes, without complicated circulation cylinder, the steam spray is uniform, and the heating efficiency is high.

Further, the axes of the heating pipes 8 are parallel to the horizontal direction, and the steam injection holes are set on the upper part of the heating pipes 8 . On the one hand, the steam-water mixture ejected from the heating pipe 8 can quickly rise to the water surface, and the water flow can automatically replenish downward under the action of its own weight. On the other hand, it is convenient for maintenance personnel to observe the condition of the steam injection hole and perform maintenance on the steam injection hole , to avoid clogging of steam injection holes, etc.

Further preferably, the angle between the center line of each steam injection hole and the vertical plane is in the range of 22° to 60°, more preferably designed in the range of 25° to 45°; that is, each steam injection hole is slanted upward If it is sprayed in the same direction, the obtained heating effect and efficiency are particularly good. In this embodiment, the optimal value of the included angle is 35°.

Further preferably, each heat-charging tube 8 is provided with two rows of nozzle holes, and the two rows of nozzle holes are arranged symmetrically with respect to the vertical symmetry plane of the heat-charging pipe 8, and each row of nozzle holes includes A plurality of steam injection holes arranged at intervals. On the one hand, the spray holes are arranged in a row, which facilitates the formation of a relatively stable water circulation direction in the tank body 1, and ensures the effect of heating the water in the spherical tank body 1; on the other hand, the two rows of spray holes are arranged symmetrically, which can Water circulation is formed on both sides of the heating pipe 8 to improve the steam heating efficiency and effect, and ensure the uniformity of the temperature field in the spherical tank body 1 .

Continuing the structure of the above-mentioned spherical steam accumulator capable of producing superheated steam, as shown in Figure 1, a gas-liquid separation unit 12 is provided at the entrance of the first steam outlet pipe 2, and the gas-liquid separation unit 12 can adopt water droplet commonly used in the art. The separation device 12 is enough, and the specific structure is not described here. In addition, the spherical tank body 1 is also provided with pressure relief pipes, sewage pipes, release pipes, drainage pipes, manholes and other necessary nozzle facilities for heat accumulators.

In the spherical heat accumulator provided in this embodiment, there is no large opening on the tank body 1, which effectively improves the operating safety of the spherical heat accumulator.

Taking the vacuum pump used in the RH or VD refining system of a steelmaking plant as an example, the working process of the above-mentioned spherical steam accumulator that can generate superheated steam is roughly as follows:

The normal temperature water at 20°C enters the inside of the spherical tank 1 through the water inlet pipe 11 at the bottom of the spherical tank 1. When the water level inside the spherical tank 1 rises to the lowest water level, the water intake is stopped. The high-pressure saturated steam (3.2MPa, 238°C) through the high-pressure steam inlet pipe 10 at the bottom of the spherical tank 1 into each heating pipe 8, spray high-pressure high-temperature steam inside the low-temperature water inside the spherical tank 1 and mix it with normal temperature water to heat the water to high-temperature water at 238°C, Simultaneously, the pressure inside the spherical tank body 1 rises to 3.2MPa, the water level in the spherical tank body 1 rises to the highest water level, and the heating of the heat accumulator is completed. When the user needs superheated steam, the pressure regulating valve group 4 is opened, and the high-pressure steam on the upper part of the spherical tank 1 and the steam (3.2MPa, 238°C) flashed by high-temperature water pass through the water droplet separation device 12 to separate the liquid water droplets in the steam, and then pass The first outlet pipe 2 enters the pressure regulating valve group 4 to depressurize to 1.0MPa (saturation temperature under pressure is 180°C), the steam temperature drops to 191°C, and the superheat of the steam is 11°C, and then the decompressed low-pressure steam passes through the low-pressure inlet The steam pipe 3 enters the heat exchange tube 6 arranged in a serpentine shape. In the heat exchange tube 6, it exchanges heat with the high-temperature water (3.2MPa, 238°C) in the spherical tank 1. The low-pressure steam is heated to ~200°C, and the low-pressure steam The degree of superheat is 20°C, and the superheated low-pressure steam (1.0MPa, 200°C) is sent to the user through the second steam outlet pipe 5 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (10)

1. The utility model provides a can produce superheated steam's spherical steam heat accumulator, includes the spherical jar of body, be equipped with the inlet tube on the spherical jar of body and fill hot device, its characterized in that: spherical tank body top is equipped with first play steam pipe, second play steam pipe and low pressure admission pipe, the internal heat transfer unit that is used for with jar interior high temperature water heat transfer that is equipped with of spherical tank, first play steam pipe exit end through the pressure regulating valves with low pressure admission pipe entry end intercommunication, the low pressure admission pipe with the second play steam pipe respectively with heat transfer unit's income exit linkage.

2. The spherical steam heat accumulator capable of generating superheated steam according to claim 1, characterized in that: the heat exchange unit is a heat exchange pipe.

3. The spherical steam heat accumulator capable of generating superheated steam according to claim 2, characterized in that: the heat exchange tubes are arranged in the spherical tank body in a snake shape.

4. A spherical steam heat accumulator capable of generating superheated steam as set forth in claim 3 in which: the heat exchange tubes are sequentially coiled into a plurality of layers of snake-shaped layers from top to bottom in the spherical tank body.

5. The spherical steam heat accumulator capable of generating superheated steam according to claim 2, characterized in that: the heat exchange tubes are finned tubes.

6. The spherical steam heat accumulator capable of generating superheated steam according to any one of claims 2 to 5, characterized in that: the heat exchange tube is supported and arranged in the spherical tank body through a bracket.

7. The spherical steam heat accumulator capable of generating superheated steam according to claim 1, characterized in that: the heat exchange unit is connected with a drain pipe, and the drain pipe extends to penetrate out of the bottom of the spherical tank body.

8. The spherical steam heat accumulator capable of generating superheated steam according to claim 1, characterized in that: the heat filling device comprises a high-pressure steam inlet pipe penetrating through the bottom of the spherical tank body and a heat filling pipe arranged in the spherical tank body and communicated with the high-pressure steam inlet pipe, and a plurality of steam spray holes are formed in the heat filling pipe.

9. The spherical steam heat accumulator capable of generating superheated steam as set forth in claim 8, wherein: the axial line of each heat-charging pipe is parallel to the horizontal direction, and each steam jet hole is arranged at the upper part of the heat-charging pipe.

10. the spherical steam heat accumulator capable of generating superheated steam according to claim 1, characterized in that: and a gas-liquid separation unit is arranged at the inlet of the first steam outlet pipe.