Waste heat recovery system

Abstract

The waste heat recovery system comprises a waste heat recovery device, a steam supply leading-in pipe, a steam supply leading-out pipe, a continuous drainage water leading-in pipe and a clean steam leading-out pipe, the continuous drainage recovery device comprises a shell, a vaporizing chamber and a filtering chamber are arranged in the shell, and the vaporizing chamber is provided with a steam supply leading-in opening, a steam supply leading-out opening and a continuous drainage water vaporizing pipe; a plurality of layers of meshes are arranged at one end of the drainage vaporization pipe, and a pipe orifice at the other end is communicated with the filter chamber; a plurality of filter pipes are arranged in the filter chamber, and a clean steam outlet is formed in the filter chamber. Continuously discharged water is scattered into water mist through meshes with different pore diameters; high-temperature steam is introduced into the steam supply introduction port, and heat exchange is carried out on the water-mist-shaped continuous drainage water, so that the continuous drainage water is completely vaporized; the vaporized continuous drainage water can be used by a power plant or sold to the outside after being filtered by the filter pipe, so that the cost is saved; the vaporized continuous drainage water is completely separated from the high-temperature steam, and the filter pipe only needs to filter the vaporized continuous drainage water, so that the workload of the filter pipe is greatly reduced, and the service life of the filter pipe is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of boiler waste water recovery, in particular to a waste heat recovery system. Background Art

[0002] Boiler blowdown is a major loss in boiler operation. In order to control the quality of boiler water and steam, two parts of boiler wastewater must be discharged. The first part is continuous blowdown, also known as surface blowdown, which requires continuous discharge of part of the boiler water from the part with the highest salt and alkali concentration to reduce the salt content, alkali content, silica content and suspended slag content in the boiler water. The second part is periodic blowdown, also known as bottom blowdown, which needs to be discharged from the bottom of the boiler regularly.

[0003] The purpose of sewage discharge is to protect the quality of boiler water so that the boiler can operate safely and stably for a long time. However, directly discharging continuous sewage and fixed sewage will not only lose heat and affect the efficiency of the boiler, but also cause thermal pollution to the environment.

[0004] The existing technology for recycling continuous drainage water is generally to recycle it through a continuous drainage expansion tank, but the actual recovery efficiency of the continuous drainage expansion tank for continuous drainage water is only about 15%, the rest of the heat and water are all wasted, and the recovered steam still contains impurities, and the actual recovery effect is not good.

[0005] Patent publication number CN218523550U discloses "a boiler waste heat recovery system for continuous drainage". The continuous drainage is atomized by an atomizing device through a continuous drainage inlet pipe and then sprayed into a steam inlet pipe. After being mixed with high-temperature steam in a state of finer particles and vaporized, the mixed steam is all passed into a filtering device for filtration. Although this scheme overcomes the problems of incomplete vaporization and incomplete filtration mentioned originally, there is also another problem at the same time: since a large amount of heat is required to compensate the enthalpy of the continuous drainage for complete vaporization of the continuous drainage, the amount of superheated steam introduced into the continuous drainage waste heat recovery system is also huge, and the amount of mixed steam subsequently passing through the filtering device is also huge. The strength and wear resistance requirements of the filtering device will also be greatly increased, which is not conducive to ensuring the service life of the filtering device. Utility Model Content

[0006] In view of the above problems, the utility model proposes a waste heat recovery system.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A waste heat recovery system comprises a waste heat recovery device, a steam supply inlet pipe, a steam supply outlet pipe and a water discharge inlet pipe, the waste heat recovery device comprises a shell, and also comprises a clean steam outlet pipe, the shell has a vaporization chamber and a filter chamber which are sealed and separated from each other, the vaporization chamber is provided with a steam supply inlet, a steam supply outlet and a water discharge vaporization pipe; the steam supply inlet is connected to the steam supply inlet pipe, the steam supply outlet is connected to the steam supply outlet pipe, the water discharge vaporization pipe is a serpentine pipe, one end of the water discharge vaporization pipe is provided on the shell for connecting to the water discharge inlet pipe, and a plurality of layers of mesh sheets with different apertures are provided on the inner side of the end of the pipe, and the other end of the pipe is connected to the filter chamber; a plurality of filter tubes are provided in the filter chamber for filtering the vaporized water discharge, and a clean steam outlet is also provided on the filter chamber for connecting to the clean steam outlet pipe.

[0009] In one embodiment of the utility model, the steam supply inlet is arranged above the water-connecting vaporization pipe, and the steam supply outlet is arranged on the side of the bottom of the water-connecting vaporization pipe; the water-connecting vaporization pipe includes a connected introduction pipe, a heating pipe and a connecting plate, the introduction pipe is used to introduce the water-connecting into the bottom of the heating pipe, and the heating pipe is serpentine to the top of the shell; the connecting plate is a hollow plate, one side of the connecting plate is connected to the heating pipe, and the other side is provided with a plurality of connecting ports, and the connecting ports are connected to the inside of the filter tube.

[0010] In one embodiment of the present invention, the pipe opening of the introduction pipe is arranged above the steam supply outlet, and the position of the introduction pipe is opposite to the steam supply outlet.

[0011] In one embodiment of the present invention, a ceramic spiral is disposed in the filter tube.

[0012] In one embodiment of the present invention, the filter tube body is a ceramic structure, and a polytetrafluoroethylene filter layer, a hollow fiber ultrafiltration layer, a NF nanofiltration layer and a unidirectional filter membrane layer are sequentially arranged outside the tube body.

[0013] In one embodiment of the present invention, the number of the heating tubes is at least 2, which are arranged side by side in the vaporization chamber, and both ends of all the heating tubes are connected to the introduction pipe and the connection plate respectively.

[0014] In one embodiment of the present invention, the apertures of the mesh sheets disposed in the pipe opening of the water-discharging vaporization pipe decrease gradually from the pipe opening to the inside.

[0015] The beneficial effects of the utility model are as follows: the drain water is directly introduced from the boiler drum through the drain water vaporization pipe, and after being dispersed by a number of meshes of different apertures arranged at the pipe mouth, the original state of gas and liquid mainly in the form of liquid is changed into a water mist with fine particles; the high-temperature steam in the plant is introduced at the steam supply inlet, and heat is exchanged with the water mist-like drain water in the drain water vaporization pipe through the serpentine drain water vaporization pipe, so that the drain water continuously absorbs heat until it is completely vaporized; the high-temperature steam after the heat exchange is completed is discharged from the steam supply outlet, and the vaporized drain water enters the filter chamber and is filtered by the filter tube, and then is discharged from the clean steam outlet, so that the drain water is filtered to obtain clean steam, which can be used by the power plant for self-use or sold to the outside, thereby achieving cost savings; the vaporized drain water is completely separated from the high-temperature steam, and the filter tube only needs to filter the vaporized drain water, which can greatly reduce the workload of the filter tube, thereby increasing the service life of the filter tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the waste heat recovery device of this embodiment;

[0017] Figure 2 yes Figure 1 A partial enlarged schematic diagram in the middle;

[0018] Figure 3 Schematic diagram of the waste heat recovery system of this embodiment.

[0019] The reference numerals in the figures are:

[0020] 1. Shell, 2. Vaporization chamber, 3. Filter chamber, 4. Steam supply inlet, 5. Steam supply outlet, 6. Vaporization pipe with water connection, 61. Inlet pipe, 62. Heating pipe, 63. Connecting plate, 7. Mesh, 8. Filter tube, 9. Ceramic spiral, 10. Clean steam outlet, 11. Waste heat recovery device, 12. Steam supply inlet pipe, 13. Steam supply outlet pipe, 14. Water connection inlet pipe, 15. Clean steam outlet pipe, 16. Steam supply pipeline. DETAILED DESCRIPTION

[0021] The utility model is described in detail below in conjunction with the accompanying drawings.

[0022] Example

[0023] like Figure 1-3 As shown, a waste heat recovery system includes a waste heat recovery device 11, a steam supply inlet pipe 12, a steam supply outlet pipe 13, a continuous water discharge inlet pipe 14 and a clean steam outlet pipe 15.

[0024] The waste heat recovery device 11 comprises a housing 1, in which a vaporization chamber 2 and a filter chamber 3 are sealed and separated from each other.

[0025] The vaporization chamber 2 is provided with a steam supply inlet 4 , a steam supply outlet 5 and a steam-connecting water vaporization pipe 6 .

[0026] The steam supply inlet 4 is connected to the steam supply inlet pipe 12, and is used to introduce the high-temperature steam in the original steam supply pipeline in the plant into the waste heat recovery device. The steam supply outlet 5 is connected to the steam supply outlet pipe 13, and is used to introduce the steam after heat exchange back to the original steam supply pipeline 16 in the plant.

[0027] The water discharge vaporization pipe 6 is a serpentine pipe, one end of which is provided on the shell 1 for connecting with the water discharge inlet pipe 14 , and a plurality of layers of mesh sheets 7 with different apertures are provided inside the end of the pipe. The other end of the pipe is connected with the filter chamber 3 .

[0028] A plurality of filter tubes 8 are provided in the filter chamber 3 for filtering the vaporized continuous drainage water. A clean steam outlet 10 is also provided on the filter chamber 3 for connecting with a clean steam outlet pipe 15 to introduce the filtered clean steam into the original steam supply pipeline 16 in the factory.

[0029] The steam supply inlet pipe 12, the steam supply outlet pipe 13 and the clean steam outlet pipe 15 are all provided with a shutoff valve to control the connection and shutoff of the corresponding pipes. The continuous water discharge inlet pipe 14 is provided with a regulating valve to control the amount of continuous water discharge entering the waste heat recovery device 11.

[0030] The continuous drainage water is directly introduced from the boiler drum through the continuous drainage water vaporization pipe 6, and after being dispersed by a plurality of meshes 7 with different apertures arranged at the pipe mouth, the original state of gas and liquid mainly composed of liquid is changed into a water mist with fine particles.

[0031] High-temperature steam in the plant is introduced at the steam supply inlet 4, and passes through the serpentine continuous drainage vaporization pipe 6 to exchange heat with the water mist continuous drainage in the continuous drainage vaporization pipe 6, so that the continuous drainage continuously absorbs heat until it is completely vaporized.

[0032] After the heat exchange is completed, the high-temperature steam is discharged from the steam supply outlet 5, and the vaporized continuous drainage water enters the filter chamber 3 and is filtered by the filter tube 8 before being discharged from the clean steam outlet 10, thereby filtering the continuous drainage water to obtain clean steam, which can be used by the power plant for its own use or sold to the outside, thereby achieving cost savings; the vaporized continuous drainage water is completely separated from the high-temperature steam, and the filter tube 8 only needs to filter the vaporized continuous drainage water, which can greatly reduce the workload of the filter tube 8 and thus increase the service life of the filter tube 8.

[0033] The steam supply inlet 4 is arranged above the water-discharging vaporization pipe 6 , and the steam supply outlet 5 is arranged at the side of the bottom of the water-discharging vaporization pipe 6 .

[0034] The continuous drainage vaporization pipe 6 includes an introduction pipe 61, a heating pipe 62 and a connection plate 63 which are connected to each other. The introduction pipe 61 is used to introduce the continuous drainage into the bottom of the heating pipe 62, and the heating pipe 62 is serpentinely spiraled to the top of the shell 1. The connection plate 63 is a hollow plate, one side of the connection plate 63 is connected to the heating pipe 62, and the other side is provided with a plurality of connection ports 631, and the connection ports 631 are connected to the inside of the filter tube 8.

[0035] The mesh 7 is arranged at the inlet pipe 61, and the aperture of the mesh 7 is set to decrease from the pipe mouth to the inside. After the continuous drainage is introduced from the pipe mouth, it is first roughly scattered by the mesh 7 with a large aperture, and then continuously refined into a mist-like small water droplet form by a number of meshes 7 with decreasing apertures arranged in sequence. In this embodiment, the number of meshes 7 is 4, and the spacing between the meshes increases as the aperture decreases, and the pipe section where the mesh 7 is located is detachably connected to the inlet pipe 61 as a whole, so that the mesh 7 can be removed as a whole for replacement.

[0036] The pipe opening of the introduction pipe 61 is arranged above the steam supply outlet 5 , and the position of the introduction pipe 61 is opposite to the steam supply outlet 5 .

[0037] The atomized continuous drainage water is led through the steam supply outlet 5 through the inlet pipe 61, and is initially heated by the relatively low temperature steam before reaching the bottom of the heating pipe 62. From the bottom, it spirals upward along the serpentine heating pipe 62, and continuously exchanges indirect heat with the high-temperature steam coming from the steam supply inlet 4 above, and then gradually heats up until it is completely vaporized. The vaporized continuous drainage water is collected at the connection plate 63, and enters the filter tube 8 through the connection port 631 for filtration.

[0038] There are at least two heating tubes 62, which are arranged side by side in the vaporization chamber 2, and both ends of all heating tubes 62 are respectively connected to the introduction tube 61 and the connection plate 63. In this embodiment, there are four heating tubes 62, which can disperse the atomized continuous drainage water, which is conducive to more uniform and rapid heat absorption of the continuous drainage water.

[0039] A ceramic spiral 9 is provided in the filter tube 8, and the continuous discharge steam in the gas state impacts on the ceramic spiral 9, which first performs a preliminary filtration on the continuous discharge steam. At the same time, the continuous discharge steam rotates along the spiral to produce a centrifugal effect and impacts on the filter membrane, thereby enhancing the filtering effect.

[0040] The body of the filter tube 8 is a ceramic structure, and a polytetrafluoroethylene filter layer, a hollow fiber ultrafiltration layer, a NF nanofiltration layer and a unidirectional filter membrane layer are sequentially arranged outside the tube body.

[0041] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A waste heat recovery system, comprising a waste heat recovery device, a steam supply inlet pipe, a steam supply outlet pipe and a water supply inlet pipe, wherein the waste heat recovery device comprises a shell, characterized in that: It also includes a clean steam outlet pipe, and the shell has a vaporization chamber and a filter chamber that are sealed and separated from each other. The vaporization chamber is provided with a steam supply inlet, a steam supply outlet and a water-connecting vaporization pipe; the steam supply inlet is connected to the steam supply inlet pipe, and the steam supply outlet is connected to the steam supply outlet pipe. The water-connecting vaporization pipe is a serpentine pipe, and one end of the water-connecting vaporization pipe is provided on the shell for connecting to the water-connecting inlet pipe, and a plurality of layers of mesh with different apertures are provided on the inner side of the end of the pipe, and the other end of the pipe is connected to the filter chamber; a plurality of filter tubes are provided in the filter chamber for filtering the vaporized water-connecting, and a clean steam outlet is also provided on the filter chamber for connecting to the clean steam outlet pipe.

2. The waste heat recovery system according to claim 1, characterized in that: The steam supply inlet is arranged above the water-connecting vaporization pipe, and the steam supply outlet is arranged on the side of the bottom of the water-connecting vaporization pipe; the water-connecting vaporization pipe includes a connected introduction pipe, a heating pipe and a connecting plate, the introduction pipe is used to introduce the water-connecting into the bottom of the heating pipe, and the heating pipe is serpentinely coiled to the top of the shell; the connecting plate is a hollow plate, one side of the connecting plate is connected to the heating pipe, and the other side is provided with a plurality of connecting ports, and the connecting ports are connected to the inside of the filter tube.

3. The waste heat recovery system according to claim 2, characterized in that: The pipe opening of the introduction pipe is arranged above the steam supply outlet, and the position of the introduction pipe is opposite to the steam supply outlet.

4. The waste heat recovery system according to claim 3, characterized in that: A ceramic spiral is arranged in the filter tube.

5. The waste heat recovery system according to any one of claims 2 to 4, characterized in that: The filter tube body is a ceramic structure, and a polytetrafluoroethylene filter layer, a hollow fiber ultrafiltration layer, a NF nanofiltration layer and a unidirectional filter membrane layer are sequentially arranged outside the tube body.

6. The waste heat recovery system according to claim 5, characterized in that: The number of the heating tubes is at least 2, which are arranged side by side in the vaporization chamber, and both ends of all the heating tubes are connected to the introduction pipe and the connection plate respectively.

7. The waste heat recovery system according to claim 5, characterized in that: The apertures of the mesh sheets arranged in the pipe opening of the water vaporization pipe decrease in sequence from the pipe opening to the inside.

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