CN210740373U - Steam-water injection type temperature and pressure reducing device - Google Patents
Steam-water injection type temperature and pressure reducing device Download PDFInfo
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- CN210740373U CN210740373U CN201921652336.0U CN201921652336U CN210740373U CN 210740373 U CN210740373 U CN 210740373U CN 201921652336 U CN201921652336 U CN 201921652336U CN 210740373 U CN210740373 U CN 210740373U
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Abstract
The utility model relates to a steam-water injection type temperature and pressure reducing device, which comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a Laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is connected with a mixing pipe 10 and a diffuser pipe 12 in turn. Through the utility model discloses carry out the temperature and pressure reduction of steam, effectively shortened the mixing time of steam and water, shortened the length of hybrid tube and diffuser pipe simultaneously, reduced running cost and energy consumption.
Description
Technical Field
The utility model relates to a steam temperature and pressure reduction technical field, concretely relates to soda injection type temperature and pressure reduction device of low energy consumption.
Background
The temperature and pressure reducing device reduces high-temperature and high-pressure steam into low-pressure and low-temperature superheated steam or saturated steam which can meet the requirements of equipment. Taking a denitration urea hydrolyzer of a thermal power plant as an example, the steam required by the hydrolyzer is about 0.7MPa and 165 ℃, but the auxiliary steam of a boiler of the power plant is basically 0.8-3.0MPa, and the temperature is basically 280-350 ℃; if the high-temperature high-pressure steam directly enters the urea hydrolyzer, the equipment of the hydrolyzer is broken down or even damaged, and the service life of the hydrolyzer is greatly shortened; and meanwhile, urea cannot be completely decomposed into ammonia gas and carbon dioxide, so that urea resources are wasted, and the efficiency of the hydrolyzer is reduced. Taking the steam at the outlet of the superheater of the boiler in the thermal power plant as an example, the steam generated by the boiler enters the steam turbine to do work after being further heated by the heater, but the steam turbine is sensitive to the temperature and the pressure of the steam, and if the steam parameter is greater than the upper limit of the steam parameter required by the steam turbine, the steam turbine is damaged, and meanwhile, great potential safety hazards can be caused. The temperature and pressure must be reduced to the appropriate range by the desuperheating and depressurizing device.
The traditional temperature and pressure reducing device has the problems of small flow adjustable range, large noise vibration and the like, and also has the problems of complex structure, large volume, high precision requirement of part components, high energy consumption of system operation and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a soda injection formula pressure and temperature reduction device, this pressure and temperature reduction device simple structure is reasonable, and the equipment integrated level is high, easy operation, and the operation is reliable.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline, a temperature reducing water inlet pipeline, a rotary atomizer, a Laval nozzle, a receiving chamber, a mixing pipe and a diffuser pipe; the outlet of the high-temperature high-pressure steam inlet pipeline is connected with a Laval nozzle, the outlet of the desuperheating water inlet pipeline is connected with a rotary atomizer, and the outlet of the rotary atomizer and the outlet of the Laval nozzle are both communicated with one end of the receiving chamber; the other end of the receiving chamber is sequentially connected with the mixing pipe and the diffuser pipe.
In the steam-water injection type temperature and pressure reducing device, the rotary atomizer is composed of a plurality of guide vanes with the same rotation direction and angle, an outer cylindrical cylinder and an inner cylindrical cylinder.
In the steam-water injection type temperature and pressure reducing device, the included angle between the guide vane and the axis of the rotary atomizer is 15-75 degrees.
According to the steam-water injection type temperature and pressure reducing device, the receiving chamber, the mixing pipe and the diffuser pipe are integrally in a Laval pipe form.
Adopt the soda injection type temperature and pressure reduction process of the device is as follows:
s1, allowing high-temperature and high-pressure steam to enter a Laval nozzle through a high-temperature and high-pressure steam inlet pipeline, and spraying the steam to form a low-pressure and reflux area in the receiving chamber;
s2, allowing the desuperheating water to enter the rotary atomizer through the desuperheating water inlet pipeline and be atomized into small droplets, rotating at a high speed around the Laval nozzle, and injecting the small droplets into the receiving chamber due to the low pressure formed in the step S1;
steam sprayed by the nozzle S3 and temperature-reduced water droplets in the step S2 are contacted and mixed in a return zone of the receiving chamber to exchange heat, and high-temperature and high-pressure steam is changed into superheated steam with relatively low temperature and pressure;
s4 the mixture of desuperheated water droplets and superheated steam generated in step S3 from the receiving chamber enters a mixing pipe to further mix and transfer heat, thereby further reducing the temperature of the steam;
s5 the steam generated in step S4 enters the diffuser pipe from the mixing pipe, the steam speed is reduced, the pressure is increased, and the steam suitable for use is formed.
The small temperature-reducing water droplets are partially evaporated in the receiving chamber and are continuously evaporated in the mixing pipe, and the high-temperature high-pressure steam is cooled through two evaporation processes.
Compared with the prior art, the utility model discloses an useful part is:
the rotary atomizer is used for atomizing the desuperheating water, the structure is simple and stable, the number of desuperheating water inlets and corresponding pipeline connections are reduced, and the number of desuperheating water atomizing devices is reduced;
because the receiving chamber has a reflux area, the contact time of the steam and the desuperheating water in the receiving chamber is prolonged, the heat transfer effect is better, the temperature and the pressure can be reduced in a short time and a short distance, and the temperature and the pressure are close to the designed values when the mixture of the steam and the desuperheating water enters the mixing pipe, so that the lengths of the mixing pipe and the diffuser pipe can be shortened; moreover, the receiving chamber, the mixing pipe and the diffuser pipe are integrally in a Laval pipe form, and the characteristics that the Laval pipe enables the steam pressure to be reduced and the flow speed to be increased are utilized, so that the steam and the temperature-reduction water droplets are violently mixed in the receiving chamber and the mixing pipe and are fully contacted to carry out strong energy and momentum conversion, the mixing time of the steam and the water is effectively shortened, and the lengths of the mixing pipe and the diffuser pipe are also shortened; compared with the temperature and pressure reducing device with the same specification, the length of the mixing pipe and the diffuser pipe can be shortened by about 30 percent;
the utility model can adjust the flow of high-temperature and high-pressure steam by adjusting the size of the Laval nozzle, and adjust the flow of the desuperheating water so as to accurately reduce the final steam temperature and pressure to the designed value, thereby improving the desuperheating and depressurizing precision and simultaneously increasing the adjustable range of the steam flow;
by adopting the device, the pressure and temperature reduction processes are simultaneously carried out in the device, and compared with the device which reduces pressure by the pressure reducing valve and then reduces temperature, the operation flow is simplified;
by adopting the device of the utility model, the whole structure of the temperature and pressure reducing device is simplified, the use of complex structural accessories and auxiliary devices in the process of temperature and pressure reduction is reduced, and the device has the advantages of simple structure, convenient operation, small overall dimension and small occupied space after installation; meanwhile, because no mechanical transmission part is arranged in the device, the device has simple structure, stable operation and convenient maintenance, and reduces the operation cost and energy consumption.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the temperature and pressure reducing device of the present invention;
fig. 2 is a schematic diagram of a preferred structure of the rotary atomizer of the present invention.
Reference numerals: 1-high temperature high pressure steam inlet pipeline, 2-desuperheating water inlet pipeline, 3-rotary atomizer, 4-Laval nozzle, 5-Laval nozzle throat, 6-Laval nozzle outlet cross section, 7-reflux zone, 8-receiving chamber, 9-receiving chamber and mixing pipe interface, 10-mixing pipe, 11-mixing pipe and diffuser pipe interface, 12-diffuser pipe, 13-diffuser pipe outlet interface, 14-guide vane, 15-outer cylinder, 16-inner cylinder, A-high temperature high pressure steam inlet, B-desuperheating water inlet, C-steam outlet.
Detailed Description
Embodiment 1 of the utility model: as shown in fig. 1, a steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is sequentially connected with a mixing pipe 10 and a diffuser pipe 12; the receiving chamber 8, the mixing tube 10 and the diffuser tube 12 are integral in the form of a laval tube. Wherein the outlet cross section 6 of the laval nozzle 4 can be arranged in the receiving chamber 8.
Example 2: as shown in fig. 1, a steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is connected with a mixing pipe 10 and a diffuser pipe 12 in turn. Wherein the outlet cross section 6 of the laval nozzle 4 can be arranged in front of the inlet of the receiving chamber 8.
Example 3: as shown in fig. 1 and 2, the steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is sequentially connected with a mixing pipe 10 and a diffuser pipe 12; the rotary atomizer 3 consists of a plurality of guide vanes 14 with the same rotation direction and angle, an outer cylinder 15 and an inner cylinder 16; the included angle between the guide vane 14 and the axis of the rotary atomizer 3 is 15-40 degrees.
The larger the included angle between the guide vane 14 and the axis of the rotary atomizer 3 is, the better the atomization effect is relatively, but the larger the angle is, the larger the resistance is, and therefore, the proper included angle is comprehensively selected according to the working conditions.
Example 4: as shown in fig. 1 and 2, the steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is sequentially connected with a mixing pipe 10 and a diffuser pipe 12; the rotary atomizer 3 consists of a plurality of guide vanes 14 with the same rotation direction and angle, an outer cylinder 15 and an inner cylinder 16; the included angle between the guide vane and the axis of the rotary atomizer is 50-75 degrees; the receiving chamber 8, the mixing tube 10 and the diffuser tube 12 are integral in the form of a laval tube.
Example 5: as shown in fig. 1 and 2, the steam-water injection type temperature and pressure reducing device comprises a high-temperature high-pressure steam inlet pipeline 1, a temperature reducing water inlet pipeline 2, a rotary atomizer 3, a laval nozzle 4, a receiving chamber 8, a mixing pipe 10 and a diffuser pipe 12; the outlet of the high-temperature high-pressure steam inlet pipeline 1 is connected with a Laval nozzle 4, the outlet of the desuperheating water inlet pipeline 2 is connected with a rotary atomizer 3, and the outlet of the rotary atomizer 3 and the outlet of the Laval nozzle 4 are both communicated with one end of a receiving chamber 8; the other end of the receiving chamber 8 is sequentially connected with a mixing pipe 10 and a diffuser pipe 12; the rotary atomizer 3 consists of a plurality of guide vanes 14 with the same rotation direction and angle, an outer cylinder 15 and an inner cylinder 16; the included angle between the guide vane and the axis of the rotary atomizer is 35-55 degrees.
The utility model discloses a theory of operation of embodiment:
as shown in fig. 1 and 2, high-temperature high-pressure steam PPFirstly, the high-temperature high-pressure steam enters a Laval nozzle 4 from a high-temperature high-pressure steam inlet pipeline 1, and the pressure of the steam is enabled to be from P due to the action of the Laval nozzlePIs reduced to the same pressure P as the inlet of the desuperheating waterhThe flow speed of the steam is greatly improved; meanwhile, after passing through the rotary atomizer 3, the desuperheated water is atomized into small droplets by the action of centrifugal force and rotates at high speed around the Laval nozzle 4.
After the steam has passed through the nozzle, the small droplets of entrained desuperheated water are advanced and the mixture fills the entire cross-section at the steam inlet in the receiving chamber 8. As the distance of the steam-water mixture from the nozzle outlet cross section increases, the steam pressure at the outlet of the receiving chamber 8 decreases to P2Meanwhile, low pressure is formed in the receiving chamber 8, so that the temperature-reduced water is injected into the receiving chamber 8; due to the high vapor velocity, a recirculation zone 7 is formed in the receiving chamber 8 to allow the vapor to fully contact the temperature-reduced water droplets, thereby enhancing the energy between the vapor and the dropletsAnd momentum conversion, so that the desuperheating water is evaporated quickly, the steam temperature is reduced quickly, and the heat transfer effect is better, therefore, the desuperheating and the pressure reducing can be realized in a short time and a short distance, and the mixing distance is greatly shortened. Part of the temperature-reduced water is evaporated in the receiving chamber 8, and the high-temperature and high-pressure steam is changed into superheated steam having relatively low temperature and pressure.
Due to the pressure P at the outlet of the receiving chamber 82Lower than the pressure P of the inlet of the desuperheating waterhUnder the action of pressure difference and entrainment of high-speed steam, the steam-water mixture enters the mixing pipe 10. The receiving chamber 8, the mixing pipe 10 and the diffuser pipe 12 are in a Laval pipe form, so that the steam-water mixture is vigorously mixed in the mixing pipe 10 to exchange energy and momentum, the small droplets of the temperature-reduced water are basically and completely evaporated with the increase of pressure, and the pressure of the steam-water mixture at the outlet of the mixing pipe 10 is increased to P3The steam temperature is further reduced and the velocity field gradually approaches equilibrium.
After the steam enters the diffuser pipe 12 from the mixing pipe 10, the steam speed is gradually reduced due to the gradually enlarged section of the diffuser pipe 12, and the pressure is further increased to PcThe temperature is further reduced, and finally steam suitable for the corresponding equipment is formed at the outlet of the diffuser pipe 12.
After the temperature and pressure reduction device of the utility model is used, the pressure of the high-temperature high-pressure steam is from PPDown to PcThe desuperheating water is completely evaporated, and finally the steam after desuperheating and pressure reducing is output from the diffuser pipe 12 at a certain temperature and pressure.
Claims (4)
1. The utility model provides a soda injection formula pressure and temperature reduction device which characterized in that: comprises a high-temperature high-pressure steam inlet pipeline (1), a temperature-reducing water inlet pipeline (2), a rotary atomizer (3), a Laval nozzle (4), a receiving chamber (8), a mixing pipe (10) and a diffuser pipe (12); the outlet of the high-temperature high-pressure steam inlet pipeline (1) is connected with the Laval nozzle (4), the outlet of the desuperheating water inlet pipeline (2) is connected with the rotary atomizer (3), and the outlet of the rotary atomizer (3) and the outlet of the Laval nozzle (4) are both communicated with one end of the receiving chamber (8); the other end of the receiving chamber (8) is sequentially connected with a mixing pipe (10) and a diffuser pipe (12).
2. The steam-water injection type temperature and pressure reducing device according to claim 1, characterized in that: the rotary atomizer (3) is composed of a plurality of guide vanes (14) with the same rotation direction and angle, an outer cylindrical cylinder (15) and an inner cylindrical cylinder (16).
3. The steam-water injection type temperature and pressure reducing device according to claim 2, characterized in that: the included angle between the guide vane (14) and the axis of the rotary atomizer (3) is 15-75 degrees.
4. The steam-water injection type temperature and pressure reducing device according to claim 1, characterized in that: the receiving chamber (8), the mixing tube (10) and the diffuser tube (12) are integrated in the form of a Laval tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921652336.0U CN210740373U (en) | 2019-09-29 | 2019-09-29 | Steam-water injection type temperature and pressure reducing device |
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| CN201921652336.0U CN210740373U (en) | 2019-09-29 | 2019-09-29 | Steam-water injection type temperature and pressure reducing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566937A (en) * | 2019-09-29 | 2019-12-13 | 中国华电科工集团有限公司 | steam-water injection type temperature and pressure reducing device and method |
| CN111761072A (en) * | 2020-07-01 | 2020-10-13 | 西安交通大学 | Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder |
| CN112084174A (en) * | 2020-09-17 | 2020-12-15 | 西安交通大学 | Rapid establishing method for steam turbine set shafting fault diagnosis database |
-
2019
- 2019-09-29 CN CN201921652336.0U patent/CN210740373U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566937A (en) * | 2019-09-29 | 2019-12-13 | 中国华电科工集团有限公司 | steam-water injection type temperature and pressure reducing device and method |
| CN111761072A (en) * | 2020-07-01 | 2020-10-13 | 西安交通大学 | Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder |
| CN111761072B (en) * | 2020-07-01 | 2021-11-09 | 西安交通大学 | Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder |
| CN112084174A (en) * | 2020-09-17 | 2020-12-15 | 西安交通大学 | Rapid establishing method for steam turbine set shafting fault diagnosis database |
| CN112084174B (en) * | 2020-09-17 | 2022-10-25 | 西安交通大学 | Rapid establishing method for steam turbine set shafting fault diagnosis database |
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