Double-purpose jacketed cyclone thermostat

Abstract

The present application relates to steam cooling equipment technical field, specifically relates to a double-purpose cyclone variable temperature device of jacketed, including cylinder, the outside of the cylinder is close to the front and is provided with annular jacket, the jacket and the outer wall of cylinder jointly enclose annular shunt cavity, the jacket is provided with medium flow inlet pipe that communicates shunt cavity, the sidewall of cylinder is provided with a plurality of injection holes corresponding to shunt cavity, a plurality of injection holes are distributed around the circumference of the cylinder, the center line of injection hole and the axial and radial of cylinder all form angle, when using, the temperature reducing water that enters via injection hole spirally flows along the inner wall of cylinder to the back and forms water film.Compared with the prior art, when being a temperature reducer, there is water film between the inner wall of cylinder and superheated steam, and the water film vaporization can take away a large amount of heat, the heat exchange effect is good, the temperature reduction is more uniform, effectively reduces the temperature of cylinder sidewall, reduces the thermal shock of superheated steam to cylinder wall, prolongs the service life, there is no traditional temperature reducing water nozzle and venturi in the cylinder, and it is convenient to manufacture.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam cooling equipment, in particular to a double-purpose cyclone temperature changer with jacket. BACKGROUND

[0002] In the field of combined cycle thermal power, petrochemical cracking, power center and other fields requiring superheated steam temperature reduction, the temperature reducer is the main superheated steam temperature reduction equipment, and its application range is very wide. In actual process production, the temperature of each temperature reducer is reduced to meet the needs of downstream production equipment at different stages, and the temperature reduction accuracy of superheated steam directly affects the product quality of downstream products. The temperature reducer is a device for adjusting the temperature of superheated steam using water as a cooling medium. Its function is to control and maintain the temperature of superheated steam or reheated steam at a specified value, and prevent the overheated and reheated steam from heating the tube wall.

[0003] The temperature reducer is divided into surface type and water spray type. The surface type temperature reducer is a partition type heat exchanger with U-shaped tubes or disc-shaped tubes in a cylindrical cylinder, and the water quality of the cooling water flowing in the tube has no special requirements, but the volume is large, easy to produce thermal fatigue, the adjustment delay is large and the adjustment range is small, and it is suitable for low and medium pressure boilers. The temperature reducer disclosed in the Chinese patent document with publication number CN207865367U adopts spiral heat exchange pipes to increase the heat exchange area, quickly reduce the temperature, effectively control the temperature of the superheated steam in the temperature reducer, and greatly improve the sensitivity of the temperature reducer, providing support for the safe operation of the waste heat boiler.

[0004] The working principle of the water spray type temperature reducer is that high temperature steam is introduced into the venturi from the inlet end of the temperature reducer, and water is sprayed into the venturi throat nozzle to form mist water droplets and mix with high speed steam flow, and then the mixture is introduced into the temperature reducer from the other end through a certain length of sleeve. In this way, the sprayed water absorbs the heat of the superheated steam and becomes steam, reducing the steam temperature. Because the quality of the temperature reducing water is very high, some boilers use self-made condensate water as the temperature reducing water source. However, the water quality of modern high-parameter boilers is very high, so boiler feed water is widely used as the temperature reducing water source, which greatly simplifies the equipment system. For example, the patent documents with publication numbers CN107709880 A, CN2636182Y and CN102588947A disclose different water spray type temperature reducers.

[0005] For the water spray type desuperheater, the prior art is through the nozzle inserted into the cylinder to spray cooling water to mix with high temperature steam, which has the following inconvenience: 1. The nozzle and the pipeline connected with the nozzle for supplying water are inserted into the cylinder, which is difficult to assemble and increases the manufacturing cost; 2. The nozzle is generally extended in the cylinder, so that most of the cooling water mixes with the superheated steam in the middle part of the cylinder, the mixing area is small, and only a small part of the cooling water flows through the wall surface of the cylinder, so that the superheated steam flowing through the wall surface of the cylinder is not uniformly and sufficiently desuperheated; further, the superheated steam directly impacts and contacts with the inner wall of the cylinder, which causes the temperature of the wall surface of the cylinder to be too high, thereby reducing the service life of the equipment.

[0006] Furthermore, due to the limitation of the existing nozzle and internal structure, the existing desuperheater can only be used for desuperheating, and is not suitable for heating, so that separate equipment needs to be provided for desuperheating and heating, which occupies a large space and has high industrial cost. SUMMARY

[0007] In view of the above technical problems of the prior art, the present application provides a double-purpose cyclone desuperheater with a jacket.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] The present application provides a double-purpose cyclone desuperheater with a jacket, which comprises a cylinder for the flow of superheated steam / medium temperature steam towards the rear, the front end of the cylinder is connected with an inlet connecting pipeline, and the rear end of the cylinder is connected with an outlet connecting pipeline, characterized in that: an annular jacket is arranged on the outer side of the cylinder close to the front end, the jacket and the outer wall of the cylinder jointly form an annular shunt cavity, and the jacket is provided with a medium flow inlet pipe communicating with the shunt cavity; a plurality of injection holes are arranged on the side wall of the cylinder corresponding to the shunt cavity, the plurality of injection holes are distributed around the circumference of the cylinder, the center line of the injection hole forms an angle with the axial direction and the radial direction of the cylinder, so that the desuperheating water / overheated steam entering through the injection hole spirally flows towards the rear along the inner wall of the cylinder to form a water film / steam film.

[0010] As a further specific solution, the cylinder comprises a straight cylinder-shaped spray cylinder and a cyclone cylinder with gradually decreasing inner diameter arranged in sequence towards the rear, and the jacket and the injection hole are arranged in the spray cylinder to form the water film / steam film in the spray cylinder and the cyclone cylinder.

[0011] As a further specific solution, the cylinder further comprises a transition section with gradually increasing inner diameter towards the rear arranged at the rear end of the spray cylinder and a straight cylinder-shaped secondary mixing cylinder arranged at the front end of the cyclone cylinder.

[0012] As a further specific solution, the plurality of injection holes are arranged on the same radial cross section of the cylinder.

[0013] As a further specific scheme, multiple said injection holes are arranged on different radial sections of said cylinder body, and the injection holes of different radial sections are arranged in axial alignment or staggered arrangement, and said angles of the injection holes of different radial sections are the same or different.

[0014] As a further specific scheme, multiple said injection holes are uniformly distributed at equal intervals around said cylinder body in a circumferential direction; or multiple said injection holes are non-uniformly distributed at non-equal intervals around said cylinder body in a circumferential direction.

[0015] As a further specific scheme, said port of said medium inflow pipe is provided with an inlet flange assembly.

[0016] As a further specific scheme, the number of said medium inflow pipes is one or more than two.

[0017] As a further specific scheme, said shunt cavity is provided with a hydrophobic valve.

[0018] Advantages of the present application

[0019] In practical application, when used as a desuperheater, superheated steam flows into the front end of the cylinder body, and desuperheating water flows into the medium inflow pipe, and the superheated steam is cooled by the desuperheating water and then flows out from the rear end of the cylinder body; when used as a heater, medium-pressure steam flows into the front end of the cylinder body, and superheated steam flows into the medium inflow pipe, and the medium-pressure steam is heated by the high-pressure steam and then flows out from the rear end of the cylinder body. Compared with the prior art, the present application has the following advantages:

[0020] (1) When used as a desuperheater, the water film of the desuperheating water spiraling along the inner wall of the cylinder body can fully contact and mix with the superheated steam, the heat exchange effect is good, and the superheated steam is desuperheated more uniformly; when used as a heater, the superheated steam spiraling along the inner wall of the cylinder body forms a steam film, which is intended to isolate and not to mix with the steam, so as to protect the medium-pressure steam in the middle from condensing due to the cold wall surface, thus the entire cylinder body does not need to be filled with saturated superheated steam, the superheated steam is less, and energy saving effect is achieved. Under the above premise, the overall length of the desuperheater can be shortened, the manufacturing cost is reduced, and the economic benefit is improved;

[0021] (2) When used as a desuperheater, there is a layer of desuperheating water film between the inner wall of the cylinder body and the superheated steam, and the water film vaporization can carry away a large amount of heat, effectively reduce the temperature of the cylinder side wall, reduce the thermal shock of the superheated steam to the cylinder wall, and prolong the service life;

[0022] (3) The spiral flow of desuperheating water / superheated steam has small impact pressure on the inner wall of the cylinder body;

[0023] (4) There is no traditional desuperheating water nozzle and Venturi tube in the cylinder body, the structure is simple, and the manufacturing is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure diagram of a jacketed dual-purpose cyclone temperature changer in an embodiment.

[0025] Figure 2 Structure diagram of another view of a jacketed dual-purpose cyclone temperature changer in an embodiment.

[0026] Figure 3 Structure diagram of another embodiment, showing two rows of injection holes.

[0027] Figure 4 Structure diagram of Figure 3 one of the radial cross-sectional views.

[0028] Figure 5 Structure diagram of Figure 3 another radial cross-sectional view, mainly showing the differences in the angles and arrangements of the injection holes in different cross sections. Figure 4

[0029] Reference signs:

[0030] Cylinder 1, transition section 11, injection cylinder 12, cyclone cylinder 13, secondary mixing cylinder 14, injection hole 15;

[0031] Jacket 2, flow distribution chamber 3, medium flow inlet pipe 4, inlet flange assembly 5;

[0032] Inlet connecting pipe 6, outlet connecting pipe 7. DETAILED DESCRIPTION

[0033] The present application will be described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0034] The jacketed dual-purpose cyclone temperature changer in the present embodiment can be used as a desuperheater or a heater, and the following will be described by taking the desuperheater as an example, as shown in Figure 1 and Figure 2 ​As shown, including the superheated steam from left to right to the rear flow through the transversely arranged cylinder 1, the front end of the cylinder 1 is connected with the inlet connecting pipe 6 for the flow of superheated steam, the rear end of the cylinder 1 is connected with the outlet connecting pipe 7 for the flow of desuperheated steam, as an improvement: the outer side of the cylinder 1 near the front end is provided with an annular jacket 2, the jacket 2 and the outer wall of the cylinder 1 together form an annular shunt cavity 3, the jacket 2 is provided with a medium flow pipe 4 communicating with the shunt cavity 3, the number of medium flow pipe 4 in this example is two, one of which is provided with a drain valve at the corresponding shunt cavity 3 to discharge after use. The port of the medium flow pipe 4 is provided with an inlet flange assembly 5 for connecting the peripheral water supply mechanism. The side wall of the cylinder 1 corresponding to the shunt cavity 3 is provided with a plurality of injection holes 15, which are distributed around the circumference of the cylinder 1, the center line of the injection hole 15 forms an angle α with the axial direction of the cylinder 1 and an angle β with the radial direction, so that the desuperheated water entering the shunt cavity 3 from the medium flow pipe 4 forms a water film along the inner wall of the cylinder 1 by the injection hole 15 during use. In practice, according to the process conditions, the number, aperture and angle of the injection hole 15 are determined by CFD simulation calculation.

[0035] Compared with the prior art, since the superheated steam has the tendency to flow to the wall of the cylinder 1, the spiral water film along the inner wall of the cylinder 1 can fully contact with the superheated steam, the heat exchange effect is good, the superheated steam is desuperheated more uniformly, and under this premise, the length of the desuperheater can be shortened, the manufacturing cost can be reduced and the economic benefit can be improved. There is a layer of desuperheated water film between the inner wall of the cylinder 1 and the superheated steam, and the water film vaporization can take away a large amount of heat, effectively reduce the temperature of the side wall of the cylinder 1, reduce the thermal shock of the superheated steam to the cylinder wall, and prolong the service life. The spiral flow of desuperheated water has small impact pressure on the inner wall of the cylinder 1. There is no traditional desuperheated water nozzle and venturi in the cylinder 1, the structure is simple and easy to manufacture.

[0036] In practice, when used as a heater, the structure is almost unchanged, and the medium flow pipe 4 flows into superheated steam. As can be seen, the front end of the cylinder 1 flows into superheated steam / medium temperature steam, and the medium flow pipe flows into desuperheated water / superheated steam. Obviously, the " / " here represents an "or" relationship, that is, "the inlet connecting pipe 6 flows into medium temperature steam - the medium flow pipe 4 flows into superheated steam - the water film is formed in the cylinder 1" one by one; and "the inlet connecting pipe 6 flows into medium temperature steam - the medium flow pipe 4 flows into superheated steam - the steam film is formed in the cylinder 1" one by one.

[0037] In this embodiment, the cylinder body 1 includes a transition section 11 with an increasing rear diameter, a straight cylinder section 12, a cyclone cylinder section 13 with a gradually decreasing diameter, and a straight secondary mixing cylinder section 14 arranged in sequence from rear to front. The jacket 2 and the spray holes 15 are arranged in the spray cylinder section 12 to form the water film / steam film in the spray cylinder section 12 and the cyclone cylinder section 13.

[0038] In this embodiment, as shown in Figs. 1 and 2, the spray holes 15 are arranged in the same radial section of the cylinder body 1. Figure 1 and Figure 2 In practice, as shown in Figs. 3 and 4, the spray holes 15 can be arranged in different radial sections of the cylinder body 1. Figures 3 to 5 Figure 3 The spray holes 15 are arranged in two annular rows, and in practice, they can be arranged in multiple rows. Figure 4 and Figure 5 The spray holes 15 in different radial sections are arranged axially offset, and in practice, they can be arranged in alignment according to requirements. Figure 4 and Figure 5 The angles of the spray holes 15 in different radial sections are the same, and in practice, they can be different according to requirements. In this embodiment, the spray holes 15 are uniformly distributed at equal intervals in the circumferential direction of the cylinder body 1, and in practice, they can be non-uniformly distributed at unequal intervals in the circumferential direction of the cylinder body 1. Therefore, the spray holes 15 can be arranged more densely in positions where the superheated steam tends to flow more, or the angles of the spray holes 15 can be adjusted to form a water film with a larger water flow, so as to more specifically contact the desuperheating.

[0039] In addition, it should be noted that after the applicant made the innovative improvement of the present case, the following prior art document was retrieved during the novelty search. The Chinese patent document with publication number CN205592935U discloses a steam desuperheater. Cooling medium flows into each nozzle through a shunt cavity, and the cooling medium is sprayed at high speed from the periphery of the cylinder body 1 to the middle of the mixing cavity. However, it emphasizes that the spray direction of the nozzle is perpendicular to the steam flow direction, and a nozzle is used to form fine spray in the mixing cavity. On the one hand, under the premise that the prior art document emphasizes that the spray direction of the desuperheating water is perpendicular to the steam flow direction, the person skilled in the art has no motivation to break the limitation and change it to the opposite direction, and it is not easy to think of designing the desuperheating water direction as an inclined spiral flow. On the other hand, the fine spray of the prior art document and the formation of the water film of the present case are quite different in working mode. The nozzle of the prior art document can only avoid the impact of the superheated steam on the position where the nozzle is located, but the other positions of the cylinder body 1 still have the problem of being impacted by steam with too high a temperature. The spiral water film of the present case can cover a large area of the inner wall of the cylinder body 1, so the prior art document cannot achieve the effect of the spiral water film of the present case. In summary, the prior art document does not affect the creativity of the present case.

[0040] ​In the description of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", "linking" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art. The machinery, parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0042] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A jacketed dual-purpose cyclone temperature converter, comprising a cylinder for rearward flow of superheated steam / medium-temperature steam, an inlet connection pipe connected to the front end of the cylinder, and an outlet connection pipe connected to the rear end of the cylinder, characterized in that: An annular jacket is provided on the outer side of the cylinder near the front end. The jacket and the outer wall of the cylinder together form an annular flow-dividing cavity. The jacket is provided with a medium inlet pipe that connects to the flow-dividing cavity. Multiple injection holes are provided on the side wall of the cylinder corresponding to the flow-dividing cavity. The multiple injection holes are distributed around the circumference of the cylinder. The center line of the injection hole forms an angle with the axial and radial directions of the cylinder, so that the desuperheated water / superheated steam entering through the injection hole flows spirally backward along the inner wall of the cylinder to form a water film / steam film.

2. The jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The cylinder body includes a straight cylindrical spray nozzle arranged rearward and a cyclone tube with a gradually decreasing inner diameter. The jacket and injection holes are arranged in the spray nozzle to form the water film / vapor film inside the spray nozzle and the cyclone tube.

3. A jacketed dual-purpose cyclone temperature converter according to claim 2, characterized in that: The cylinder also includes a transition section with an inner diameter that gradually increases rearward at the rear end of the spray nozzle and a straight cylindrical secondary mixing cylinder at the front end of the cyclone.

4. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The plurality of injection holes are arranged on the same radial section of the cylinder.

5. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: Multiple injection holes are arranged on different radial sections of the cylinder. The injection holes of different radial sections are aligned or staggered in the axial direction of the cylinder. The angles of the injection holes of different radial sections are the same or different.

6. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The plurality of injection holes are evenly distributed at equal intervals around the circumference of the cylinder; or the plurality of injection holes are non-uniformly distributed at non-equal intervals around the circumference of the cylinder.

7. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The port of the medium inlet pipe is equipped with an inlet flange assembly.

8. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The number of media inlet pipes is one or more.

9. A jacketed dual-purpose cyclone temperature converter according to claim 1, characterized in that: The diversion cavity is equipped with a drain valve.

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