Venturi type steam rotational flow atomization desuperheater and regulation and control system

Abstract

The invention discloses a Venturi type steam rotational flow atomization desuperheater and a regulation and control system, and belongs to the technical field of steam temperature and pressure reduction. The problems that in an existing desuperheater, desuperheating water makes direct contact with a high-temperature barrel, the local temperature difference of the barrel is obviously increased, and cracks or deformation is likely to be generated due to thermal stress in long-term operation are solved. A venturi structure is applied to the desuperheater, a steam inlet pipeline, an inlet conical pipe section, a venturi throat pipe section, an outlet conical pipe section and an outlet pipeline are arranged in the desuperheater, and steam sequentially passes through the structure. And a sawtooth rotational flow channel is arranged on the inner wall of the venturi throat pipe section. The conical pipe section is provided with water spraying holes, the sleeve is fixed outside the throat pipe section, and desuperheating water enters the steam flow channel through the sleeve and the water spraying holes. And the regulation and control system realizes automatic regulation of the flow of desuperheating water. The desuperheating water is uniformly atomized under the impact action of the rotational flow steam, and liquid drops rapidly absorb heat and are evaporated into low-temperature steam, so that a proper desuperheating and decompressing effect is achieved, and the direct contact between the desuperheating water and the high-temperature cylinder is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam temperature and pressure reduction, and in particular relates to a Venturi-type steam swirl atomizing desuperheater and a control system. Background Art

[0002] High-temperature steam plays an indispensable role in industrial production and heating, along with water, electricity, and gas. Based on the principle of high-pressure transmission and low-pressure use, different fields require different pressures and temperatures for steam. Traditional steam desuperheaters usually adopt a built-in cooling water flow channel design, in which the cooling water is in direct contact with the high-temperature cylinder, resulting in large local temperature differences in the cylinder. Long-term operation can easily lead to cracks or deformation due to thermal stress. Although existing technologies have attempted to alleviate the problem through material optimization or external insulation, they have not fundamentally solved the problem of thermal stress concentration caused by direct contact of cooling water with the cylinder, resulting in damage to steam pipes in many industrial application sites.

[0003] The desuperheater in this paper features a serrated, rotating channel on the inner wall of the Venturi throat, creating a swirling flow as the steam passes through it. After passing through the throat, the steam accelerates and collides with the high-velocity desuperheating water ejected through the spray holes in the conical outlet section. This high-velocity desuperheating water is atomized more evenly under the impact of the steam. The swirling action intensifies the mixing of the droplets with the surrounding high-temperature steam, allowing the desuperheating water droplets to quickly absorb heat and evaporate into low-temperature steam. This allows the desuperheating water to effectively target the desuperheater's target area, effectively reducing direct contact between the atomized droplets and the high-temperature cylinder, and achieving excellent pressure reduction and temperature reduction for high-temperature, high-pressure steam. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a Venturi-type steam swirl atomizing desuperheater and a control system, which is used to solve the problems of stress concentration, metal fatigue, etc. in the existing desuperheater after the inner wall of the cylinder is subjected to drastic changes in hot and cold alternation in high-temperature steam. Under the long-term impact of high-temperature steam and high-speed cooling water (low temperature), it is easy to cause erosion and fracture of the inner wall of the cylinder. In the Venturi-type steam swirl atomizing desuperheater of the present invention, the high-temperature steam is accelerated and forced to swirl after passing through the Venturi throat section, and collides with the high-speed cooling water jet at the outlet conical section; the steam swirl and the collision effect make the cooling water more fully atomized, and the atomized droplets are more fully in contact with the surrounding high-temperature steam under the drive of the steam swirl. Under the above-mentioned combined effect, the cooling water is more fully atomized, and quickly absorbs heat and evaporates in the high-temperature steam to form low-temperature steam, thereby achieving the purpose of cooling and reducing the pressure of high-temperature steam.

[0005] To achieve the above goals, the technical solutions adopted by this patented design of a Venturi-type steam swirl atomizing desuperheater and control system are as follows:

[0006] A Venturi-type steam swirl atomizing desuperheater and control system includes a desuperheater and a control system. The desuperheater includes a desuperheater pipe connected to a Venturi tube section. The desuperheater throat section barrel is connected to a sleeve. The desuperheater throat section barrel is provided with a water spray hole. The axial direction of the water spray hole can be set to a specific direction according to actual needs. The water spray hole is connected to the sleeve. The sleeve is connected to a liquid supply pipe, and a solenoid valve is installed on the supply pipe. The inner wall of the Venturi tube throat is evenly provided with serrated swirl channels. The specific number of swirl channels and swirl angle can be set according to specific circumstances. The control system includes a temperature sensor, a pressure sensor, and a proportional regulator. The temperature sensor and pressure sensor are installed inside the outlet of the desuperheater pipe. The proportional regulator is connected to the temperature sensor, pressure sensor, and solenoid valve.

[0007] Furthermore, a sealing assembly is provided at the connection between the sleeve and the cooler cylinder.

[0008] Furthermore, a sealing assembly is provided at the connection between the sleeve and the liquid supply pipe.

[0009] Furthermore, a solenoid valve is installed at the connection between the sleeve and the liquid supply pipe, and the flow rate of the cooling water can be regulated by the solenoid valve.

[0010] Furthermore, the water spray holes are distributed in a ring shape on the outer circumference of the desuperheater cylinder.

[0011] Furthermore, the sawtooth swirl channel is spiral and evenly distributed on the inner wall of the Venturi tube.

[0012] Furthermore, the angle α1 of the inlet conical pipe section, the angle α2 of the outlet conical pipe section, the angle α3 of the cooling water spray hole, and the angle α4 of the sawtooth swirl channel are adjustable.

[0013] Furthermore, the sleeve and the axis of the desuperheater cylinder are in the same plane.

[0014] Furthermore, the axis of the cooling water spray hole and the axis of the steam pipe are in the same plane.

[0015] Furthermore, the installation position of the temperature and pressure sensors is within a reasonable range from the water spray hole position.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This invention employs uniformly arranged serrated swirl channels along the inner wall of the Venturi tube. High-temperature steam passing through the Venturi tube undergoes swirl due to the serrated swirl channels. This method not only increases steam velocity but also enhances the impact effect, accelerating the atomization of the desuperheated water under the impact of the swirling steam, allowing it to rapidly absorb heat and evaporate.

[0018] 2. The present invention employs adjustable angles α1, α2, and α3 of the inlet conical section, the outlet conical section, and the cooling water spray hole. The inlet conical section angle α1 of the Venturi tube is between 10° and 20°, with 20° being the optimal angle. This effectively reduces the inlet length and hydraulic losses. The outlet conical section angle α2 is between 5° and 7° and 10° and 15°, with 15° being the optimal angle. This effectively reduces hydraulic losses while keeping the outlet length short. The cooling water spray hole angle α3 is adjustable to ensure that the cooling water entering the desuperheater does not impact the inner wall of the cylinder. The sawtooth swirl channel angle α4 is between 20° and 30°, ensuring that the high-temperature steam entering the desuperheater fully swirls, reducing steam pressure loss.

[0019] 3. The present invention adopts a water spray hole, the position of which is adjustable, which can meet the design of countercurrent injection, downstream injection, vertical injection, etc., and the water spray holes are distributed in a ring shape on the outer circumference of the cylinder, which is more suitable for practical applications.

[0020] 4. The present invention provides a sleeve that can allow the cooling water to be sucked in or sprayed into the Venturi tube section by configuring pressure, so that the cooling water is fully atomized in the Venturi tube section, and the cooling water can stably enter the Venturi tube section from the sleeve.

[0021] 5. The present invention adopts a sawtooth swirl channel, the number of which is adjustable, and 6-8 swirl channels can be set.

[0022] 6. The water spray hole of the present invention is in the same plane as the axis of the desuperheater cylinder, which maximizes the jet distance of the desuperheated water and prevents the desuperheated water from directly impacting the cylinder wall.

[0023] 7. The control system of the present invention includes a temperature sensor, a pressure sensor, a control device, a proportional regulator, and a timing device. The temperature and pressure sensors are installed at the outlet of the desuperheater pipe and feed the collected signals back to the proportional regulator. The proportional regulator then compares the signals and transmits a signal to the solenoid valve to control the flow of desuperheated water entering the Venturi section. The timing device controls the system's operating time, ensuring efficient and safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure shows an overall schematic diagram of a Venturi-type steam swirl atomizing desuperheater and a control system of the present invention;

[0025] Figure 2 A schematic structural diagram of a Venturi-type steam swirl atomizing desuperheater according to the present invention is shown;

[0026] Figure 3 The present invention shows Figure 2Figure A is a schematic diagram of the structure of a partial section;

[0027] Figure 4 The present invention shows Figure 2 Schematic diagram of the structure of the middle BB section;

[0028] Figure 5 The present invention shows Figure 4 Schematic diagram of the structure of the middle CC section;

[0029] Figure 6 The flowchart of the control system of the present invention is shown;

[0030] In the figure, 1 - desuperheater inlet pipe 2 - inlet conical pipe section 3 - Venturi throat section 4 - outlet conical pipe section 5 - desuperheater outlet pipe 6 - sleeve 7 - water spray hole 8 - sawtooth swirl channel 9 - desuperheater cylinder 10 - liquid supply pipe 11 - solenoid valve 12 - control device 13 - proportional regulator 14 - timing device 15 - temperature and pressure sensor. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The present invention is a venturi type steam swirl atomizing desuperheater and control system, the overall structure of which is as follows Figure 1 shown.

[0033] See attached Figure 2 The present invention discloses a Venturi-type steam swirl atomizing desuperheater, the specific structure of which is shown in the figure. This desuperheater employs a Venturi structure, with a desuperheater inlet pipe 1 disposed internally. The desuperheater inlet pipe connects to an inlet conical pipe section 2, which in turn connects to a Venturi throat section 3, which in turn connects to an outlet conical pipe section 4, which in turn connects to a desuperheater outlet pipe 5.

[0034] See attached Figure 3 The water spray hole 7 of the present invention is located at the intersection of the extended line of the nozzle axial direction and the sleeve 6, and the water spray hole 7 extends into the desuperheater barrel 9. The sleeve 6 connects the nozzle to the water spray hole 7. This structure can effectively allow the desuperheated water to be sucked or sprayed into the desuperheater through the sleeve.

[0035] See attached Figure 4 The present invention evenly arranges serrated grooves on the inner wall of the Venturi throat section 3 to form a serrated swirl channel 8. The cross-sectional structure is as follows: Figure 4 As shown, the high-speed and high-temperature steam swirls due to the sawtooth swirl channel 8, making the desuperheated water more fully atomized after entering the desuperheater.

[0036] See attached Figure 6 The present invention places a temperature and pressure sensor 15 within the desuperheater outlet pipe 5. The collected signals are fed back to a proportional regulator 13, which then compares the collected signals and transmits a signal to a solenoid valve 11 to control the flow of desuperheated water into the Venturi section. A timing device 14 is also incorporated. When the collected value and the signal value are equal, the timing device outputs a countdown signal to a control device 12, regulating the operating state of the control device 12. This invention achieves more uniform atomization of the final sprayed desuperheated water and more effectively and safely achieves the cooling and pressure reduction functions through a signal feedback mechanism.

[0037] The following is further explained in conjunction with the working process of the present invention:

[0038] In this embodiment, high-speed, high-temperature steam enters the desuperheater inlet pipe 1. When the high-speed, high-temperature steam flows through the inlet conical pipe section 2, its speed increases and its pressure decreases. When the high-speed, high-temperature steam flows through the Venturi throat section 3, it swirls due to the action of the sawtooth swirl channel 8. At the same time, the solenoid valve 11 at the connection between the liquid supply pipe 10 and the sleeve 6 is opened, and the cooling water is sucked into or sprayed into the desuperheater from the water spray hole 7 through the sleeve 6. The cooling water is forced to collide with the swirling high-speed, high-temperature steam, causing it to be evenly atomized. At the same time, the atomized droplets quickly absorb heat and evaporate to form low-temperature steam, which is finally discharged from the desuperheater outlet pipe 5. The temperature and pressure sensor 15 collects the steam temperature and corresponding pressure flowing through the desuperheater outlet pipe 5, and feeds the collected temperature and corresponding pressure back to the proportional regulator 13. After comparing the set value, proportional regulator 13 sends a signal to timing device 14 if it meets the set value. Timing device 14 then outputs a countdown (half-hour) signal to control device 12. During the countdown, control device 12 is inactive, and solenoid valve 11 remains operational. If the set value is not met, a signal is sent to solenoid valve 11 to regulate the flow of desuperheated water into the Venturi section. Control device 12 then adjusts the flow in real time until the set value is met. This allows the desuperheated water to efficiently and accurately reach the target area of ​​the desuperheater, achieving a better pressure-reducing and temperature-reducing effect.

[0039] In addition, for different operating conditions, it is necessary to regulate the number of sawtooth swirl channels 8, the angle α1 of the inlet conical pipe section, the angle α2 of the outlet conical pipe section, the angle α3 of the cooling water spray hole, the angle α4 of the sawtooth swirl channel, the position of the cooling water spray hole, the cooling water flow rate, etc., so that the cooling water is more fully atomized after entering the desuperheater, thereby meeting the cooling and pressure reduction requirements of the desuperheater.

[0040] The above embodiments are intended only to illustrate the design concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. A Venturi-type steam swirl atomizing desuperheater and control system, comprising a desuperheater and a control system, characterized in that: The desuperheater includes a desuperheater inlet pipe, an inlet conical pipe section, a venturi throat section, an outlet conical pipe section, and a desuperheater outlet pipe. The control system includes a temperature sensor, a pressure sensor, a control device, a proportional regulator, a timing device, and a solenoid valve. The angle α1 of the inlet conical pipe section, the angle α2 of the outlet conical pipe section, the angle α3 of the cooling water spray hole, and the angle α4 of the sawtooth swirl channel are adjustable. The inner wall of the Venturi throat section is evenly provided with sawtooth grooves to form a sawtooth swirl channel. The outlet conical pipe section is grooved outward to provide a water spray hole, a nozzle is fixedly installed in the water spray hole, and the sleeve is connected to the nozzle. The outlet pipe of the desuperheater is provided with temperature and pressure detection ports. The solenoid valve is installed on the supply pipeline to adjust the output flow of the desuperheated water. The temperature and pressure sensors are installed on the outlet pipe of the desuperheater and matched with the control device, the proportional regulator, the timing device and the electromagnetic valve.

2. The Venturi steam swirl atomizing desuperheater and control system according to claim 1, characterized in that: The desuperheater inlet pipe, the inlet cone pipe section, the venturi throat section, the outlet cone pipe section and the desuperheater outlet pipe are welded and connected in sequence.

3. The Venturi steam swirl atomizing desuperheater and control system according to claim 1, characterized in that: The inner wall of the Venturi throat section can be evenly installed with 6-8 sawtooth swirl channels. To ensure sufficient steam swirl, the sawtooth swirl channels are spiral and evenly distributed on the inner wall. The angle α4 of the sawtooth swirl channels is between 20° and 30°.

4. The Venturi steam swirl atomizing desuperheater and control system according to claim 1, characterized in that: The water spray holes can be arranged downstream, upstream or vertically. The water spray holes are distributed in an annular shape on the outer circumference of the cylinder.

5. The water spray hole according to claim 4, characterized in that: The water spray hole is opened at the position where the extension line of the nozzle axial direction intersects with the sleeve, and the water spray hole extends into the cooler cylinder, and an expansion gap is provided between the water spray hole and the nozzle.

6. The water spray hole according to claim 4, characterized in that: The included angle α3 between the water spray hole and the cylinder is adjustable.

7. The Venturi steam swirl atomizing desuperheater and control system according to claim 1, characterized in that: The included angle α1 of the inlet conical pipe section is set between 10° and 20°, and the included angle α2 of the outlet conical pipe section is set between 5° and 7° and 10° and 15°.

8. The desuperheater cylinder and the water spray hole are arranged in the same plane as claimed in claim 1. The sleeve and the desuperheater cylinder are arranged in the same plane as the axis of the sleeve.

9. The Venturi steam swirl atomizing desuperheater and control system according to claim 1, characterized in that: The temperature and pressure sensors collect and feed the signals back to the proportional regulator, which then compares the signals and sends them to the solenoid valve to control the flow of desuperheated water into the Venturi section. The temperature and pressure sensors must be installed within a reasonable distance from the water spray hole.

10. A Venturi-type steam swirl atomizing desuperheater and control system according to claim 1, wherein when the timing device meets the set value, the timing device outputs a countdown signal to the control device, during which the control device is in an inoperative state and the solenoid valve maintains its original working state; if the set value is not met, a signal is transmitted to the solenoid valve to regulate the desuperheating water flow, which is regulated in real time by the control device until the set value is met.

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