High-temperature steam connecting pipe structure with water jacket
By introducing saturated water into the jacket space of the high-temperature steam pipe structure to absorb heat, the problem of excessively high external temperature of the high-temperature steam channel is solved, which realizes the flexibility of material selection, reduces equipment costs, and simplifies the manufacturing process.
Patent Information
- Application Number
- CN202520794755.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-24
AI Technical Summary
The high temperature of the structure outside the high-temperature steam passage leads to difficulties in material selection, increased equipment costs and manufacturing difficulty. In particular, the extraction steam temperature of the high-pressure heater and deaerator exceeds 500°C, and conventional materials cannot meet the design requirements.
A high-temperature steam pipe structure with a water jacket is designed. The saturated water in the jacket space absorbs the heat conducted by the high-temperature steam, thereby reducing the structural temperature outside the high-temperature steam channel. The high-temperature transition short pipe and annular plate are made of high-temperature resistant materials, combined with a pressure-bearing shell and pipe seat made of low-temperature resistant materials, which reduces the shell thickness and manufacturing difficulty.
It effectively reduced the design temperature of the external structure of the high-temperature steam channel, reduced the material cost and manufacturing difficulty of the equipment, and reduced the overall weight and manufacturing cost of the equipment.
Smart Images
Figure CN223895436U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to high temperature heat dissipation and thermal insulation technical field, concretely is a kind of water jacketed high temperature steam connection pipe structure. BACKGROUND
[0002] With the development of large-scale high-parameter direction of thermal power boiler unit, the extraction steam temperature of high-pressure heater and deaerator of thermal power generation regenerative system increases. The extraction steam temperature of high-pressure heater even exceeds 500 DEG C, and the design temperature exceeds 540 DEG C. Such high temperature brings great difficulty to the selection of pressure-containing shell and equipment manufacturing. Taking No. 0 high-pressure heater of a million unit project as an example, the steam pressure is 15.273 MPa, the steam temperature is 515.8 DEG C, the shell side design pressure is 17.5 MPa, the design temperature is 540 / 375 DEG C, the equipment is divided into three heat transfer sections, which are superheating section, saturation section and drain cooling section, the shell side superheating section cylinder design temperature is 540 DEG C, and the other shell design temperature is 375 DEG C. The shell side superheating section cylinder design temperature is 540 DEG C, which cannot be selected by conventional carbon steel and high-strength low-alloy steel material, and only high-alloy steel such as stainless steel S31608 can be selected. Because of high temperature and low material strength, the design thickness of the superheating section cylinder is 110 mm, which exceeds the standard applicable thickness range of steel plate, and only Ⅵ grade forgings can be used. At the same time, the equipment manufacturing process is faced with the welding and heat treatment problems of the stainless steel superheating section cylinder, tube plate and adjacent cylinder. If the design and production are carried out according to the above, the equipment material cost, production cost, production difficulty and various production risks are quite high. CONTENT OF UTILITY MODEL
[0003] The utility model aims at overcoming the defects of prior art, providing a kind of water jacketed high temperature steam connection pipe structure, utilize the heat carried away by the space of jacket from high temperature steam conduction, prevent the temperature of other structures outside high temperature steam passage from continuously rising, so as to reduce the design temperature of other structures outside high temperature steam passage, reduce equipment material grade, also can reduce shell thickness, reduce equipment manufacturing difficulty, greatly reduce equipment cost.
[0004] The utility model aims at overcoming the defects of prior art, providing a kind of water jacketed high temperature steam connection pipe structure, utilize the heat carried away by the space of jacket from high temperature steam conduction, prevent the temperature of other structures outside high temperature steam passage from continuously rising, so as to reduce the design temperature of other structures outside high temperature steam passage, reduce equipment material grade, also can reduce shell thickness, reduce equipment manufacturing difficulty, greatly reduce equipment cost.
[0005] The jacket space comprises a pipe socket, a high-temperature transition short pipe and an annular plate, the pipe socket and the high-temperature transition short pipe are sleeved outside the high-temperature steam introduction pipe, and a passage is left between the pipe socket and the high-temperature steam introduction pipe and between the high-temperature transition short pipe and the high-temperature steam introduction pipe, one end of the high-temperature transition short pipe is communicated with one end of the pipe socket, and the other end of the high-temperature transition short pipe is connected with the high-temperature steam pipe, and the annular plate is arranged between the high-temperature steam introduction pipe and the high-temperature transition short pipe and connected with the high-temperature steam introduction pipe and the high-temperature transition short pipe, so as to prevent the high-temperature steam from entering the passage between the high-temperature transition short pipe and the high-temperature steam introduction pipe.
[0006] The high-temperature transition short pipe, the annular plate and the high-temperature steam pipe can be made of materials with high temperature resistance, so that the high-temperature transition short pipe, the annular plate and the high-temperature steam pipe are prevented from being damaged by the high-temperature steam.
[0007] The outer side of the inner shell is sleeved with a pressure-bearing shell, and a passage is left between the pressure-bearing shell and the inner shell, saturated water exists in the passage, the other end of the pipe socket is communicated with the pressure-bearing shell, and the saturated water is circulated in the pressure-bearing shell and the pipe socket.
[0008] The pressure-bearing shell and the pipe socket can be made of materials with low temperature resistance, so that the material grade is reduced and the cost is lowered.
[0009] The jacket space is filled with saturated water, the saturated water absorbs the heat conducted out by the high-temperature steam, the temperature of the pressure-bearing shell, the pipe socket and other structures outside the high-temperature steam passage is prevented from continuously rising, so that the design temperature of other structures outside the high-temperature steam passage is lowered, the material grade of the equipment is lowered, the shell thickness is reduced, and the equipment manufacturing difficulty is lowered.
[0010] The steam inlet is arranged at the bottom of the high-temperature steam pipe, and the top of the high-temperature steam pipe is communicated with the high-temperature steam introduction pipe.
[0011] The inner shell can be replaced by an underwater steam main pipe.
[0012] The utility model discloses a saturated water in the jacket space is used to take away the heat of the high-temperature steam conduction to the high-temperature transition short pipe by evaporation, prevents the temperature of the high-temperature transition short pipe from continuously rising, thereby insulating the high-temperature conduction of the steam to the pipe socket and the pressure-bearing shell, lowering the design temperature of the pressure-bearing shell and the pipe socket, lowering the material grade of the equipment, reducing the shell thickness, lowering the equipment manufacturing difficulty and greatly reducing the equipment cost. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is the structural schematic diagram of the utility model;
[0014] In the drawing: 1 - inner shell, 2 - pressure-bearing shell, 3 - pipe socket, 4 - high-temperature steam introduction pipe, 5 - high-temperature transition short pipe, 6 - annular plate, 7 - high-temperature steam pipe. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0017] In one embodiment of this application:
[0018] like Figure 1 As shown, a high-temperature steam pipe structure with a water jacket is installed at the bottom of the No. 0 high-pressure heater of a 1,000 MW unit. High-temperature steam enters the equipment from the bottom through this structure. The structure includes a high-temperature steam channel and a jacket space for heat dissipation. The high-temperature steam channel includes a high-temperature steam inlet pipe 4, a high-temperature steam pipe 7, and an inner shell 1. The inner shell 1 is connected to one end of the high-temperature steam inlet pipe 4 and welded together. The other end of the high-temperature steam inlet pipe 4 is connected to the high-temperature steam pipe 7. The jacket space is fitted over the inner shell 1 and the high-temperature steam inlet pipe 4.
[0019] The jacket space includes a connector seat 3, a high-temperature transition short pipe 5, and an annular plate 6. The connector seat 3 and the high-temperature transition short pipe 5 are both fitted outside the high-temperature steam inlet pipe 4, and there are channels between the connector seat 3 and the high-temperature steam inlet pipe 4, and between the high-temperature transition short pipe 5 and the high-temperature steam inlet pipe 4. One end of the high-temperature transition short pipe 5 is connected to one end of the connector seat 3 and welded together, and the other end is welded to the high-temperature steam connector 7. An annular plate 6 is provided between the high-temperature steam inlet pipe 4 and the high-temperature transition short pipe 5. The annular plate 6 is welded to the high-temperature steam inlet pipe 4 and the high-temperature transition short pipe 5 respectively. The jacket space is filled with saturated water.
[0020] The inner shell 1 is fitted with a pressure-bearing shell 2 on its outer side, and a channel is left between the pressure-bearing shell 2 and the inner shell 1. The channel contains saturated water, and the other end of the pipe seat 3 is connected to the pressure-bearing shell 2 by welding.
[0021] The steam inlet is arranged at the bottom of the high-temperature steam connector 7, and the top of the high-temperature steam connector 7 is communicated with the high-temperature steam inlet pipe 4.
[0022] When the high-temperature steam enters the inner shell 1 through the high-temperature steam connector 7 and the high-temperature steam inlet pipe 4, the high temperature of the high-temperature steam is conducted to the high-temperature transition short pipe 5 through the annular plate 6 and the high-temperature steam connector 7. Since the jacket space is always filled with saturated water, the saturated water evaporates and takes away the heat conducted by the high-temperature transition short pipe 5 when heated, thereby preventing the temperature of the high-temperature transition short pipe 5 from continuously rising, so as to isolate the high-temperature steam from being conducted to the connector seat 3 and the pressure-bearing shell 2. Therefore, when determining the design temperature of the inner shell 1, the design temperature of the pressure-bearing shell 2 and the connector seat 3 can be determined as not less than the saturated temperature under the design pressure, for example, the design temperature is 375℃, and the pressure-bearing shell 2 and the connector seat 3 can be made of low-temperature-resistant materials, for example, the material of the pressure-bearing shell 2 is 13MnNiMoR with a thickness of 60mm, and the material of the connector seat 3 is ordinary carbon steel and low-alloy high-strength steel, thereby reducing the structural weight. The design temperature of the high-temperature transition short pipe 5, the annular plate 6 and the high-temperature steam connector 7 is determined as not less than the temperature under the isentropic condition of the operating parameter and the design pressure, for example, the design temperature is 540℃, and the high-temperature transition short pipe 5, the annular plate 6 and the high-temperature steam connector 7 can be made of high-temperature-resistant materials, for example, the material is S31608, thereby achieving the purposes of reducing the material grade, reducing the shell thickness, reducing the manufacturing difficulty and reducing the cost.
[0023] In another embodiment of the present application:
[0024] On the basis of the previous embodiment, the inner shell 1 is improved in the present embodiment, and the inner shell 1 can be replaced by an underwater steam main pipe.
[0025] The above description is only the implementation manner of the present application, and it should be understood that the present application is not limited to the form disclosed in the present application, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described in the present application by the above-mentioned teaching or related technical or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the present application should be within the protection scope of the claims attached to the present application.
Claims
1. A high-temperature steam pipe connection structure with a water jacket, characterized in that: The device includes a high-temperature steam channel and a jacketed space for heat dissipation. The high-temperature steam channel includes a high-temperature steam inlet pipe (4), a high-temperature steam connector (7), and an inner shell (1). The inner shell (1) is connected to one end of the high-temperature steam inlet pipe (4), and the other end of the high-temperature steam inlet pipe (4) is connected to the high-temperature steam connector (7). The jacketed space includes a connector seat (3), a high-temperature transition short pipe (5), and an annular plate (6). The connector seat (3) and the high-temperature transition short pipe (5) are both fitted outside the high-temperature steam inlet pipe (4), and there are channels between the connector seat (3) and the high-temperature steam inlet pipe (4), and between the high-temperature transition short pipe (5) and the high-temperature steam inlet pipe (4). One end of the high-temperature transition short pipe (5) is connected to one end of the connector seat (3), and the other end is connected to the high-temperature steam connector (7). An annular plate (6) is provided between the high-temperature steam inlet pipe (4) and the high-temperature transition short pipe (5). The jacketed space is fitted outside the inner shell (1).
2. The high-temperature steam pipe connection structure with water jacket according to claim 1, characterized in that: The high-temperature transition short pipe (5), the annular plate (6), and the high-temperature steam pipe (7) can be made of materials with high temperature resistance.
3. The high-temperature steam pipe connection structure with water jacket according to claim 1, characterized in that: The inner shell (1) is fitted with a pressure-bearing shell (2) on its outer side, and a channel is left between the pressure-bearing shell (2) and the inner shell (1). The other end of the pipe seat (3) is connected to the pressure-bearing shell (2).
4. The high-temperature steam pipe connection structure with water jacket according to claim 3, characterized in that: The pressure-bearing shell (2) and the pipe seat (3) may be made of materials with low temperature resistance.
5. The high-temperature steam pipe connection structure with water jacket according to claim 1, characterized in that: The jacket space is filled with saturated water.
6. A high-temperature steam pipe connection structure with a water jacket according to any one of claims 1-5, characterized in that: The steam inlet is located at the bottom of the high-temperature steam pipe (7), and the top of the high-temperature steam pipe (7) is connected to the high-temperature steam inlet pipe (4).
7. The high-temperature steam pipe connection structure with water jacket according to claim 1, characterized in that: The inner shell (1) can be replaced with an underwater steam header.