Secondary steam scrubber tower for MVR (Mechanical Vapor Recompression) system

Abstract

The secondary steam scrubber tower for the MVR system comprises a first tower body and a second tower body fixedly connected to the outer side of the lower portion of the first tower body in a sleeving mode, the bottom of the first tower body extends into the middle section of the second tower body, a secondary steam inlet is formed in the top of the first tower body, a liquid outlet is formed in the bottom of the second tower body, and a secondary steam outlet is formed in the bottom of the second tower body. A plurality of spiral nozzles which are distributed in the longitudinal direction and arranged downwards are arranged in the first tower body, a secondary steam outlet is formed in the upper section of the second tower body, a through hole is formed in the middle of the bottom of the first tower body, and an annular liquid blocking table is upwards arranged at the position, corresponding to the circumferential edge of the through hole, of the bottom of the first tower body. A plurality of flow guide pipes communicated with the interior of the first tower body are vertically and fixedly connected to the bottom of the first tower body along the circumferential outer side of the through hole, and a gap is formed between every two adjacent flow guide pipes. The liquid blocking table and the flow guide pipe are arranged at the bottom of the first tower body, washing water is prevented from flowing out of the first tower body to form a waterfall water curtain, and the washing effect of secondary steam can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary steam treatment, in particular to a secondary steam scrubbing tower for an MVR system. Background Art

[0002] In the salt-making process of mechanical vapor recompression (MVR), the washing and defoaming of secondary steam is often carried out by a scrubber. The secondary steam from the evaporator enters the scrubber from the secondary steam inlet and then goes down through the multi-layer water mist spray area. The liquid water mist washes and removes the entrained droplets in the secondary steam to avoid serious corrosion of the compressor caused by the droplets and corrosive ions in the secondary steam. The washed secondary steam is discharged from the secondary steam outlet and enters the steam compressor. After being processed by the compressor, it is sent to the heating chamber of the evaporator as a heat source to realize the role of circulating and providing heat energy to the evaporation system. However, in the commonly used scrubber, after the washing water flows down along the inner wall of the cylinder, it is easy to form a waterfall water curtain. When the washed secondary steam passes through the waterfall water curtain, it will entrain droplets again, affecting the washing effect. Utility Model Content

[0003] In view of this, the utility model aims to overcome the deficiencies of the above-mentioned problems in the prior art and proposes a secondary steam scrubber for an MVR system.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A secondary steam scrubbing tower for an MVR system comprises a first tower body and a second tower body which is sleeved and fixedly connected to the outer side of the lower part of the first tower body, wherein the bottom of the first tower body extends into the middle section of the second tower body, the top of the first tower body is provided with a secondary steam inlet, the bottom of the second tower body is provided with a liquid discharge port, a plurality of spiral nozzles which are distributed longitudinally and arranged downward are provided in the first tower body, a secondary steam outlet is provided in the upper section of the second tower body, a through hole is opened in the middle of the bottom of the first tower body, and an annular liquid retaining platform is provided upwardly at the circumferential edge of the through hole at the bottom of the first tower body corresponding to the through hole, a plurality of flow guide pipes which are connected to the inside of the first tower body are vertically fixedly connected to the circumferential outer side of the through hole at the bottom of the first tower body, and a gap is provided between every two adjacent flow guide pipes.

[0006] Furthermore, an annular liquid storage tank is formed between the first tower body and the liquid retaining platform, and the bottom of the liquid storage tank is arranged to be a downwardly concave arc surface structure, a liquid passing hole is provided at the bottom of the liquid storage tank corresponding to each guide tube, an integrally formed limiting convex edge is provided horizontally outwardly at the upper end of the guide tube, and a limiting groove corresponding to the limiting convex edge is provided on the outer wall of the bottom of the first tower body corresponding to each liquid passing hole, and the guide tube is fixedly connected to the bottom of the first tower body through the cooperation of the limiting convex edge and the limiting groove.

[0007] Furthermore, a wire mesh demister is provided between the inside of the second tower body and the first tower body, and a support plate is fixedly connected between the second tower body and the first tower body, a plurality of air holes are evenly opened on the support plate, and the wire mesh demister is arranged on the upper side of the support plate.

[0008] Furthermore, the wire mesh demister has a thickness of 150 to 200 mm.

[0009] Furthermore, a plurality of downwardly disposed centrifugal atomizing nozzles are evenly arranged along the circumferential direction in the second tower body above the wire mesh demister.

[0010] Furthermore, a manhole is provided at the middle section of the second tower body.

[0011] Furthermore, the liquid discharge port is arranged at the bottom of the lower section of the second tower body, and the lower section of the second tower body is an inverted cone structure.

[0012] Furthermore, liquid level gauge interfaces are provided at the middle section and the lower section of the second tower body.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] When the secondary steam scrubbing tower for the MVR system described in the utility model is in use, the secondary steam enters the first tower body from the secondary steam inlet, is sprayed and washed by the spiral nozzle to remove entrained droplets and corrosive ions, flows out from the through hole, passes through the gap between the guide pipes in the second tower body and flows upward to the secondary steam outlet for discharge; at the same time, the washing water sprayed by the spiral nozzle flows down along the inner wall of the first tower body, gathers between the first tower body and the liquid retaining platform, flows downward from the guide pipe, and finally discharges from the scrubbing tower from the liquid discharge port, so as to avoid the washing water directly flowing out of the first tower body to form a waterfall water curtain, thereby causing the secondary steam to entrain droplets again. The scrubbing tower can effectively improve the washing effect of the secondary steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0016] Figure 1 A schematic diagram of the structure of a secondary steam scrubber for an MVR system according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure between the first tower body and the flow guide pipe according to an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the first tower body according to an embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the bottom structure of the first tower body according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the flow guide tube described in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. First tower body; 101. Secondary steam inlet; 102. Through hole; 103. Liquid retaining platform; 104. Liquid passing hole; 105. Limiting groove; 106. Liquid storage tank; 107. Arc surface; 2. Second tower body; 201. Upper section; 202. Middle section; 203. Lower section; 204. Liquid discharge port; 205. Secondary steam outlet; 206. Non-condensable gas outlet; 207. Manhole; 208. Liquid level gauge interface; 3. Spiral nozzle; 4. Flow guide pipe; 401. Limiting convex edge; 5. Wire mesh demister; 6. Support plate; 7. Centrifugal atomizing nozzle. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] As shown in the figure, a secondary steam scrubbing tower for an MVR system comprises a first tower body 1 and a second tower body 2 which is fixedly mounted on the outer side of the lower part of the first tower body 1, and the bottom of the first tower body 1 extends into the middle section of the second tower body 2, a secondary steam inlet 101 is provided at the top of the first tower body 1, a liquid discharge port 204 is provided at the bottom of the second tower body 2, a plurality of spiral nozzles 3 which are distributed longitudinally and arranged downward are provided in the first tower body 1, a secondary steam outlet 205 is provided at the upper section 201 of the second tower body 2, a through hole 102 is provided at the middle of the bottom of the first tower body 1, and an annular liquid retaining platform 103 is provided upward at the circumferential edge of the through hole 102 at the bottom of the first tower body 1, and a plurality of flow guide pipes 4 which are connected to the inside of the first tower body 1 are vertically fixedly mounted along the circumferential outer side of the through hole 102 at the bottom of the first tower body 1, and a gap is provided between each adjacent two flow guide pipes 4. In this embodiment, each spiral nozzle 3 is connected to the first tower body 1 through a first spray pipe. Figure 1 The direction of the middle arrow is the flow direction of the secondary steam. The secondary steam enters the first tower body 1 from the secondary steam inlet 101, is sprayed and washed by the spiral nozzle 3 to remove the entrained droplets and corrosive ions, flows out from the through hole 102, and flows upward through the gap between the guide pipes 4 in the second tower body 2 to be discharged at the secondary steam outlet 205; at the same time, the washing water sprayed by the spiral nozzle 3 flows down along the inner wall of the first tower body 1, gathers between the first tower body 1 and the liquid retaining platform 103, and flows downward from the guide pipe 4, and finally discharges from the gas washing tower from the drain port 204.

[0028] An annular liquid storage tank 106 is formed between the first tower body 1 and the liquid retaining platform 103, and the bottom of the liquid storage tank 106 is set to a downwardly concave arc surface 107 structure, and a liquid passing hole 104 is provided at the bottom of the liquid storage tank 106 corresponding to each guide tube 4, and an integrally formed limiting convex edge 401 is horizontally provided at the upper end of the guide tube 4, and a limiting groove 105 corresponding to the limiting convex edge 401 is provided on the outer wall of the bottom of the first tower body 1 corresponding to each liquid passing hole 104, and the guide tube 4 is fixedly connected to the bottom of the first tower body 1 through the cooperation of the limiting convex edge 401 and the limiting groove 105. In this embodiment, the limiting convex edge 401 is embedded in the limiting groove 105, and the limiting convex edge 401 is fixedly connected to the limiting groove 105 by screws, or the limiting convex edge 401 is bonded and fixed in the limiting groove 105 by adhesive. The bottom of the liquid storage tank 106 is set to an arc surface 107 structure to facilitate the outflow of washing water and effectively reduce the residual washing water; a limiting ridge 401 and a limiting groove 105 are set here to limit the installation of the guide tube 4 to ensure that the guide tube 4 is aligned with the liquid hole 104; and the guide tube 4 is set to a single tube structure to facilitate the targeted replacement of a certain guide tube 4 at a later time.

[0029] A wire mesh demister 5 is provided between the second tower body 2 and the first tower body 1, and a support plate 6 is fixedly connected between the second tower body 2 and the first tower body 1, and a plurality of air holes are evenly provided on the support plate 6, and the wire mesh demister 5 is provided on the upper side of the support plate 6. In this embodiment, the wire mesh demister 5 is provided, and the liquid droplets and mist entrained in the secondary steam will separate and fall from the filaments when passing through the wire mesh demister 5, and the gas basically does not contain mist after passing through the wire mesh demister 5, which can effectively remove the mist droplets of 3 to 5 μm, reduce the water content, reduce equipment corrosion, and extend the service life of the compressor.

[0030] The wire mesh demister 5 has a thickness of 150 to 200 mm.

[0031] A plurality of downwardly disposed centrifugal atomizing nozzles 7 are uniformly arranged in the circumferential direction in the second tower body 2 above the wire mesh demister 5. In this embodiment, each centrifugal atomizing nozzle 7 is connected to the second tower body 2 through a second spray pipe arranged through the side wall of the second tower body 2. The centrifugal atomizing nozzle 7 is arranged above the wire mesh demister 5, and the wire mesh demister 5 is regularly flushed to ensure the gas-liquid separation effect of the wire mesh demister 5, while also ensuring its use efficiency.

[0032] A manhole 207 is provided at the middle section 202 of the second tower body 2 to facilitate inspection and cleaning of the internal structure of the second tower body 2 .

[0033] The drain port 204 is disposed at the bottom of the lower section 203 of the second tower body 2 , and the lower section 203 of the second tower body 2 is an inverted cone structure, so that the liquid in the second tower body 2 can be collected and discharged from the drain port 204 .

[0034] Liquid level gauge interfaces 208 are provided on both the middle section 202 and the lower section 203 of the second tower body 2 .

[0035] A non-condensable gas outlet 206 is also provided in the upper section 201 of the second tower body 2. Before the system is started, the non-condensable gas in the steam washing tower is discharged from the non-condensable gas outlet 206 to avoid problems such as reduced heating effect of the heat source, increased energy consumption, and increased compressor load after entering the system through the compressor.

[0036] The working process of this embodiment is as follows:

[0037] Secondary steam enters the first tower body 1 from the secondary steam inlet 101, is sprayed and washed by the spiral nozzle 3 to remove entrained droplets and corrosive ions, flows out from the through hole 102 and flows upward through the gap between the guide pipes 4 in the second tower body 2, and then passes through the wire mesh demister 5 to remove the entrained droplets in the secondary steam, and the secondary steam is finally discharged from the secondary steam outlet 205; at the same time, the washing water sprayed by the spiral nozzle 3 flows down along the inner wall of the first tower body 1, gathers in the liquid storage tank 106, and flows downward from the guide pipe 4, and finally discharges from the gas washing tower from the drain port 204.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary steam scrubber for an MVR system, characterized in that: The utility model comprises a first tower body and a second tower body which is sleeved and fixedly connected to the outer side of the lower part of the first tower body, and the bottom of the first tower body extends into the middle section of the second tower body, a secondary steam inlet is arranged at the top of the first tower body, a liquid discharge port is arranged at the bottom of the second tower body, a plurality of spiral nozzles which are distributed longitudinally and arranged downward are arranged in the first tower body, a secondary steam outlet is arranged at the upper section of the second tower body, a through hole is opened in the middle of the bottom of the first tower body, and an annular liquid blocking platform is arranged upwardly at the circumferential edge of the through hole corresponding to the bottom of the first tower body, a plurality of flow guide pipes which are connected with the inside of the first tower body are vertically fixedly connected along the circumferential outer side of the through hole at the bottom of the first tower body, and a gap is arranged between each two adjacent flow guide pipes.

2. The secondary steam scrubber for an MVR system according to claim 1, characterized in that: An annular liquid storage tank is formed between the first tower body and the liquid retaining platform, and the bottom of the liquid storage tank is arranged to be a downwardly concave arc surface structure, a liquid passing hole is provided at the bottom of the liquid storage tank corresponding to each guide pipe, an integrally formed limiting convex edge is horizontally provided at the upper end of the guide pipe, and a limiting groove corresponding to the limiting convex edge is provided on the outer side wall of the bottom of the first tower body corresponding to each liquid passing hole, and the guide pipe is fixedly connected to the bottom of the first tower body through the cooperation of the limiting convex edge and the limiting groove.

3. The secondary steam scrubber for an MVR system according to claim 1, characterized in that: A wire mesh demister is arranged between the inside of the second tower body and the first tower body, and a support plate is fixedly connected between the second tower body and the first tower body, a plurality of air holes are evenly opened on the support plate, and the wire mesh demister is arranged on the upper side of the support plate.

4. The secondary steam scrubber for an MVR system according to claim 3, characterized in that: The thickness of the wire mesh demister is 150-200mm.

5. The secondary steam scrubber for an MVR system according to claim 3, characterized in that: A plurality of downwardly disposed centrifugal atomizing nozzles are evenly arranged along the circumferential direction in the second tower body above the wire mesh demister.

6. The secondary steam scrubber for an MVR system according to claim 1, characterized in that: A manhole is provided at the middle section of the second tower body.

7. The secondary steam scrubber for an MVR system according to claim 1, characterized in that: The liquid discharge port is arranged at the bottom of the lower section of the second tower body, and the lower section of the second tower body is an inverted cone structure.

8. The secondary steam scrubber for an MVR system according to claim 1, characterized in that: Liquid level gauge interfaces are provided at the middle section and the lower section of the second tower body.

Images