CN108267030B - Combined jet injection type steam-water mixing and heating device - Google Patents
Combined jet injection type steam-water mixing and heating device Download PDFInfo
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- CN108267030B CN108267030B CN201810354838.9A CN201810354838A CN108267030B CN 108267030 B CN108267030 B CN 108267030B CN 201810354838 A CN201810354838 A CN 201810354838A CN 108267030 B CN108267030 B CN 108267030B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
- F28C3/08—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour with change of state, e.g. absorption, evaporation, condensation
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Abstract
The invention discloses a combined jet injection type steam-water mixing heating device suitable for a low-pressure working condition, which comprises a scaling arc-shaped mixing chamber, a diffusion chamber, a steam-water mixing strengthening chamber, a plurality of condensed water injection inlets and at least two steam inlets, wherein the scaling arc-shaped mixing chamber is provided with a plurality of condensed water injection inlets; one end face of the scaling arc-shaped mixing chamber is coaxially connected with one end face of the steam-water mixing strengthening chamber, and the other end face of the steam-water mixing strengthening chamber is coaxially connected with the diffusion chamber; the condensed water injection inlets are connected with the other end face of the scaling arc-shaped mixing chamber; the pipe wall of the throat part of the scaling arc-shaped mixing chamber is connected with at least two steam inlets. The ratio of the diameter of the end face of the scaling arc-shaped mixing chamber to the length of the pipe is 0.2-0.5; the ratio of the total sectional area of the condensed water injection inlets to the sectional area of the throat of the steam-water mixing strengthening chamber is 0.008-0.02; the ratio of the total cross-sectional area of the condensed water injection inlets to the total cross-sectional area of the steam inlets is 0.03-0.07; the ratio of the throat section of the steam-water mixing strengthening chamber to the outlet section of the diffusion chamber is 2-5; the diameter ratio of the throat part to the end face of the scaled arc-shaped mixing chamber is 0.50-0.99.
Description
Technical Field
The invention relates to a structural design of a combined jet injection type steam-water mixing heating device suitable for a low-pressure working condition, which is used for the field of steam-water surface type heat exchange technology, in particular to the field of surface type heat exchange technology and device under a vacuum state and the like.
Background
The heat exchanger is equipment capable of realizing heat exchange, is widely applied to industries such as chemical industry, medicine, thermal power generation and the like, and plays an important role in thermal power generating units.
The low-pressure heater in the thermal power generating unit is a heat exchanger, and the low-pressure heater exchanges heat between condensed water of the unit and steam doing work in the steam turbine, so that the water supply temperature is increased to improve the circulation efficiency of the thermodynamic system. At present, a multi-stage surface heater is mainly adopted for heating water supply in a low-pressure heating system of a thermal power plant at home and abroad, but the surface heater has the problems of poor high end, easy scaling, copper-containing condensate, huge system and the like, and particularly the surface heater in a vacuum state is more serious. For these problems, the scholars have proposed to replace the surface heat exchanger with a hybrid heat exchanger, such as a hybrid heater in existing power plants in the united states.
The mixed heat exchanger directly contacts and mixes the low-temperature working medium and the high-temperature working medium for heat exchange, the heat exchange effect is better than that of the surface heat exchanger, and the end difference can be effectively reduced. The injection type heat exchanger is a direct contact type steam-water mixing heat exchanger, and steam is used as a heat source to heat cold water, so that the water temperature at an outlet is increased; the working modes are divided into a steam jet type and a water jet type. The single-tube injection type steam-water mixed heater has the advantages of simple structure, easy processing, low cost, stable operation, convenient installation and maintenance, good sealing performance and the like, overcomes the defect of poor high end of the surface heat exchanger, improves the heat exchange coefficient and is gradually put into industrial application. However, the existing single-tube injection type steam-water mixing heater has the defects that the throat part cannot be long due to the limitation of the structural size, so that the steam-liquid mixing is insufficient, and the heating performance and injection performance of the heater are reduced; and in the single-tube injection type steam-water mixing heater, the steam-water mixing contact area is smaller than that of the same-volume multi-tube injection type steam-water mixing heater, and the multi-tube injection type steam-water mixing heater based on the arc injection chamber has the advantages and simultaneously increases the heat exchange area, so that the heat exchange effect is further improved.
The research on the injection type steam-water mixing heater mainly focuses on injecting steam to heat low-temperature water, increasing the outlet pressure of the heater, reducing vibration and noise when the heater works, and the like. The injection type steam-water mixing efficient heater proposed by Pei Zhigang and the like [ application number: 201620014486.9]. The device utilizes the gravity effect to complete the direct heat exchange between vertically flowing steam and cold water entering from the periphery, and has the defects that the outlet pressure of a heater is small, and the device is required to be entirely immersed in the cold water when in use; zhang Funiu and the like: 0341417. X ]. The structure of the original steam-water mixing heater is improved, the conclusion that the flow resistance is minimum when the included angle between the water supplementing (backwater) pipe and the water inlet cavity is 40-50 degrees is obtained, and the purpose of enhancing heat exchange is achieved by reducing the sectional area of the water inlet cavity and increasing the flow speed; hou Changjun and the like, and circular holes are uniformly formed in the wall of the rear section of the mixing tube in the circumferential direction so as to reduce vibration [ application number: 200520106835.1]; tong Mingwei an ejector type hybrid heater [ application number: 201710421925.7 it utilizes the injection rivers to guide the high-temperature steam and carries on the mixed heat exchange, has saved the tubular product of the surface test heater and strengthened the heat exchange at the same time, but its injection type heat exchange structure that put forward is still more complicated, only suitable for the working condition that the pressure is higher and has larger end difference at the same time; there has been no great progress in the research on an ejector-type hybrid heater under vacuum.
The current situation of the injection type steam-water mixed heater is researched, and the research on the injection performance, the heat exchange performance and the structure of the multi-pipe injection type steam-water mixed heater under the conditions of low pressure and vacuum is less, and the research and the application of the multi-pipe injection type steam-water mixed heater under the power plant parameters still have a larger lifting space. At present, a multi-pipe injection type steam-water mixing efficient heater suitable for a low-pressure system of a thermal power plant, particularly in a vacuum state is lacking.
Disclosure of Invention
Aiming at the problems of low heat efficiency, large heat exchange end difference and the like of the existing single-tube injection type steam-water mixed heater, the invention provides the combined jet injection type steam-water mixed heating device.
In order to solve the technical problems, the invention adopts the following technical scheme:
a combined jet injection type steam-water mixing heating device comprises a scaling arc-shaped mixing chamber, a diffusion chamber, a steam-water mixing strengthening chamber, a plurality of condensate injection inlets and at least two steam inlets;
one end face of the scaling arc-shaped mixing chamber is coaxially connected with one end face of the steam-water mixing strengthening chamber; the other end face of the steam-water mixing strengthening chamber is coaxially connected with the diffusion chamber; the condensed water injection inlets are connected with the other end face of the scaling arc-shaped mixing chamber and are symmetrically distributed; the pipe wall of the throat part of the scaling arc-shaped mixing chamber is connected with at least two steam inlets which are uniformly distributed along the periphery of the section of the throat part of the scaling arc-shaped mixing chamber, and the axes of the steam inlets are all on the perpendicular bisector of the axis of the scaling arc-shaped mixing chamber; the steam-water mixing strengthening chamber consists of a first concentric reducing pipe, a throat pipe and a second concentric reducing pipe;
the ratio of the total sectional area of the condensed water injection inlets to the sectional area of the throat of the steam-water mixing strengthening chamber is 0.008-0.02; the ratio of the throat section of the steam-water mixing strengthening chamber to the outlet section of the diffusion chamber is 2-5; the ratio of the diameter of the end face of the scaling arc-shaped mixing chamber to the length of the pipe of the scaling arc-shaped mixing chamber is 0.2-0.5; the ratio of the total cross-sectional area of the condensed water injection inlets to the total cross-sectional area of the steam inlet is 0.03-0.07; the diameter ratio of the throat part to the end face of the scaling arc-shaped mixing chamber is 0.50-0.99.
The principle of the invention is as follows: under the low-pressure and vacuum conditions, in the scaling arc-shaped mixing chamber, when supercooled water passes through the condensed water injection inlet, the flow speed is increased, the pressure is reduced, and a low-pressure area is formed at the outlet of the condensed water injection inlet; the steam entering from the steam inlet is sucked in a low-pressure area and mixed with supercooled water, energy, momentum and quality are exchanged between the steam and the water, and the scaled arc structure of the mixing chamber strengthens injection, so that the steam and the water are mixed more severely; then the mixture enters a steam-water mixing strengthening chamber to further strengthen the mixing of steam and water, the water temperature is increased, and the scaled arc-shaped mixing chamber is matched with the steam-water mixing strengthening chamber to form two-stage injection, so that the injection effect is improved; finally, the water enters the diffusion chamber, the pressure of the water flow is increased, and the heating process of the supercooled water is completed.
The invention has the technical effects that: the temperature of the outlet of the diffusion chamber is increased by 4.26 ℃ compared with that of a single-pipe injection type mixed heater; compared with the original surface low-pressure heater of the power plant, the outlet temperature of the heater is increased by 2.3 ℃, the end difference of the heater is reduced from 4.15 ℃ to 1.85 ℃, the dimensionless heat exchange coefficient is increased by 23.6%, the injection coefficient is increased by 22.6%, and the heat exchange power is increased by 3993.06KW. The invention improves the performance of the heater, improves the overall efficiency of the 660MW unit by 0.15%, and saves 8514.72t standard coal in one year of operation.
Drawings
FIG. 1 is a schematic perspective view of a combined jet injection type steam-water mixing heating device;
FIG. 2 is a cross-sectional view of a combined jet injection type steam-water mixing heating device;
in the figure, 1-a scaled arc mixing chamber; 2-a diffusion chamber; 3-a steam-water mixing strengthening chamber; 4, a condensed water injection inlet; 5-steam inlet.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1 and 2, the combined jet injection type steam-water mixing heating device comprises a scaling arc-shaped mixing chamber 1, a diffusion chamber 2, a steam-water mixing strengthening chamber 3, a plurality of condensate injection inlets 4 and at least two steam inlets 5.
One end face of the scaling arc-shaped mixing chamber 1 is coaxially connected with one end face of the steam-water mixing strengthening chamber 3; the other end face of the steam-water mixing strengthening chamber 3 is coaxially connected with the diffusion chamber 2; the condensed water injection inlets 4 are connected with the other end face of the scaling arc-shaped mixing chamber 1 and are symmetrically distributed; the pipe wall of the throat part of the scaling arc-shaped mixing chamber 1 is connected with at least two steam inlets 5, and the steam inlets 5 are uniformly distributed along the periphery of the throat section of the scaling arc-shaped mixing chamber 1, and the axes of the steam inlets 5 are all on the perpendicular bisector of the axis of the scaling arc-shaped mixing chamber 1; the steam-water mixing strengthening chamber 3 consists of a first concentric reducing pipe, a throat pipe and a second concentric reducing pipe.
The ratio of the total sectional area of the condensed water injection inlets 4 to the sectional area of the throat pipe of the steam-water mixing strengthening chamber 3 is 0.008-0.02; the ratio of the throat section of the steam-water mixing strengthening chamber 3 to the outlet section area of the diffusion chamber 2 is 2-5; the ratio of the diameter of the end face of the scaling arc-shaped mixing chamber 1 to the length of the pipe of the scaling arc-shaped mixing chamber 1 is 0.2-0.5; the ratio of the total cross-sectional area of the condensed water injection inlets 4 to the total cross-sectional area of the steam inlet 5 is 0.03-0.07; the diameter ratio of the throat part to the end face of the scaling arc-shaped mixing chamber 1 is 0.50-0.99.
In the present embodiment, the number of condensate injection inlets 4 is nine, and the number of steam inlets 5 is four.
Compared with the test results of the existing single-tube injection type steam-water mixed heater, the test results of the invention are shown in the following table:
from the test results, it is seen that:
the outlet temperature of the diffusion chamber is increased by 2.3 ℃ compared with the outlet temperature of the original surface low-pressure heater of the power plant, and the end difference of the heater is reduced from 4.15 ℃ to 1.85 ℃; compared with a single-tube injection type mixed heater, the temperature is increased by 4.26 ℃, the dimensionless heat exchange coefficient is increased by 23.6%, the injection coefficient is increased by 22.6%, the heat exchange power is increased by 3993.06KW, and the overall efficiency of the unit can be increased by 0.15%; the 660MW unit operates for one year, and 8514.72t standard coal can be saved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (1)
1. A combined jet injection type steam-water mixing and heating device is characterized in that: comprises a scaling arc-shaped mixing chamber (1), a diffusion chamber (2), a steam-water mixing strengthening chamber (3), a plurality of condensed water injection inlets (4) and at least two steam inlets (5);
one end face of the scaling arc-shaped mixing chamber (1) is coaxially connected with one end face of the steam-water mixing strengthening chamber (3); the other end face of the steam-water mixing strengthening chamber (3) is coaxially connected with the diffusion chamber (2); the condensed water injection inlets (4) are connected with the other end face of the scaling arc-shaped mixing chamber (1) and are symmetrically distributed; the pipe wall of the throat part of the scaling arc-shaped mixing chamber (1) is connected with at least two steam inlets (5), the steam inlets (5) are uniformly distributed along the periphery of the section of the throat part of the scaling arc-shaped mixing chamber (1), and the axes of the steam inlets (5) are all arranged on the perpendicular bisector of the axis of the scaling arc-shaped mixing chamber (1); the steam-water mixing strengthening chamber (3) consists of a first concentric reducing pipe, a throat pipe and a second concentric reducing pipe;
the ratio of the total sectional area of the condensed water injection inlets (4) to the sectional area of the throat of the steam-water mixing strengthening chamber (3) is 0.008-0.02; the ratio of the throat of the steam-water mixing strengthening chamber (3) to the outlet cross section of the diffusion chamber (2) is 2-5; the ratio of the diameter of the end face of the scaling arc-shaped mixing chamber (1) to the length of the tube of the scaling arc-shaped mixing chamber (1) is 0.2-0.5; the ratio of the total sectional area of the condensed water injection inlets (4) to the total sectional area of the steam inlet (5) is 0.03-0.07; the diameter ratio of the throat part to the end face of the scaling arc-shaped mixing chamber (1) is 0.50-0.99.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810354838.9A CN108267030B (en) | 2018-04-19 | 2018-04-19 | Combined jet injection type steam-water mixing and heating device |
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| CN201810354838.9A CN108267030B (en) | 2018-04-19 | 2018-04-19 | Combined jet injection type steam-water mixing and heating device |
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| CN108267030A CN108267030A (en) | 2018-07-10 |
| CN108267030B true CN108267030B (en) | 2023-08-25 |
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| CN111223582B (en) * | 2020-01-15 | 2021-08-06 | 上海交通大学 | Device for inhibiting direct contact condensation pressure pulsation |
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| RU2012829C1 (en) * | 1991-05-12 | 1994-05-15 | Борис Иванович Стрикица | Regenerative heater of feeding water of ejector |
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| CN205300305U (en) * | 2016-01-08 | 2016-06-08 | 广东一也节能科技有限公司 | High -efficient heater is mixed to injection type soda |
| CN106370029A (en) * | 2016-09-22 | 2017-02-01 | 安庆康为模具制造有限公司 | Air-water mixing type heat exchanger |
| CN106767001A (en) * | 2016-12-23 | 2017-05-31 | 邢淦琛 | A kind of spiral steam heater |
| CN208042820U (en) * | 2018-04-19 | 2018-11-02 | 重庆大学 | A kind of multiple jet flow injection type steam-water injection |
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2018
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2012829C1 (en) * | 1991-05-12 | 1994-05-15 | Борис Иванович Стрикица | Regenerative heater of feeding water of ejector |
| CN2456021Y (en) * | 2000-12-25 | 2001-10-24 | 清华大学 | Steam-water heat exchanging booster |
| CN1959323A (en) * | 2006-11-27 | 2007-05-09 | 重庆大学 | Mixing heater of jetting steam caused by liquid |
| CN201184755Y (en) * | 2008-02-03 | 2009-01-21 | 新疆东海热能科技开发有限公司 | Acoustic-speed-varying supercharging heat pump type heat exchanger |
| CN202254924U (en) * | 2011-08-11 | 2012-05-30 | 沈阳热力设备制造总厂 | Efficient boosting heat exchanger |
| CN102679763A (en) * | 2012-04-27 | 2012-09-19 | 太原理工大学 | Steam and water mixing heater |
| CN205300305U (en) * | 2016-01-08 | 2016-06-08 | 广东一也节能科技有限公司 | High -efficient heater is mixed to injection type soda |
| CN106370029A (en) * | 2016-09-22 | 2017-02-01 | 安庆康为模具制造有限公司 | Air-water mixing type heat exchanger |
| CN106767001A (en) * | 2016-12-23 | 2017-05-31 | 邢淦琛 | A kind of spiral steam heater |
| CN208042820U (en) * | 2018-04-19 | 2018-11-02 | 重庆大学 | A kind of multiple jet flow injection type steam-water injection |
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