An intelligent steam heat exchange condensate steam trap device

Abstract

The present invention discloses an intelligent steam heat exchange condensate steam trap device, which comprises a sealed hollow cylindrical structure composed of a cylinder body, a flat bottom head and an upper cover. A steam condensate inlet, a steam condensate outlet, a pressurized water steam inlet and an exhaust port are arranged on the side wall of the cylinder body. Inside the sealed hollow cylindrical structure, there are three layers of plug valves coaxially connected by a coaxial connecting rod. A control cylinder driving assembly drives the coaxial connecting rod to rotate to control the opening and closing of the steam condensate inlet, the steam condensate outlet and the pressurized water steam inlet. The present invention can recover the steam condensate under pressure back to the boiler station with the original steam pressure, which not only prevents the secondary flash evaporation of the original atmospheric pressure recovery steam trap and wastes a certain amount of heat energy, but also recovers the boiler circulating water to achieve balance, with obvious energy-saving effect; the maximum energy saving improves the high-temperature production environment, bringing great benefits to both people and control equipment.

Description

Technical Field

[0001] The invention relates to the field of steam traps, and in particular to an intelligent steam trap device for steam heat exchange condensate water. Background Art

[0002] The existing technologies are all mechanical float or bucket structures. The structure is composed of a condensate collection bucket, a float or an inverted bucket inside, and a switch valve connected by a connecting rod. The principle is that when condensate does not enter, the valve core is closed by its own weight to block the discharge of steam. When steam condensate enters and reaches a certain liquid level, the condensate generates buoyancy on the float or inverted bucket, and the drain valve core is pushed open through the connecting rod of the valve core. At this time, the condensate is pushed by the upstream pressure to discharge the steam condensate out of the bucket. When the water level drops to the lower limit level, due to the reduction or disappearance of buoyancy, the valve core is closed through the connecting rod under the action of the float and bucket's own weight, achieving the drain effect of only draining water but not steam. In this reciprocating operation, the steam condensate is intermittently discharged and recycled from the heat exchanger.

[0003] Based on the mechanical structure characteristics of the existing technology and the discharge of condensed water by steam pressure, it has the following defects. In addition to the factors of the size of the fluid diameter and the flow resistance coefficient, the drainage volume mainly depends on the upstream and downstream pressure difference of the steam trap core. The larger the pressure difference, the larger the drainage volume, otherwise it is small; in order to increase the water delivery, the steam point generally adopts the outlet normal pressure method to increase the drainage volume. In this way, the condensed water discharged under pressure will immediately produce a "secondary flash" phenomenon under low pressure or normal pressure. The normal pressure steam flashed out will take away part of the heat in the condensed water, which will not only cause the loss of heat energy but also greatly increase the temperature of the surrounding working environment, which will worsen the working environment of personnel and control instruments. If the method of recovering steam condensed water under pressure at the steam trap outlet is adopted, it will directly lead to a decrease in water delivery. In severe cases, the condensed water will flow back and submerge the heat exchange surface, which will stop the heat exchange and affect the product quality.

[0004] In addition, its working mechanical structure (connecting rod and valve core) will wear out over a long period of time and there is no sealing compensation structure, which not only reduces the amount of water discharge and steam leakage, but also greatly reduces the life of the equipment and greatly increases the maintenance cost. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an intelligent steam trap device for heat exchange condensate water.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An intelligent steam heat exchange condensate steam trap device, comprising a sealed hollow cylindrical structure composed of a cylinder body, a flat bottom head and an upper cover. A steam condensate inlet, a steam condensate outlet, a pressurized water steam inlet and a non-condensable gas discharge outlet are provided on the side wall of the cylinder body. Inside the sealed hollow cylindrical structure, there are three layers of plug valve cores connected by a coaxial connecting rod. There are three layers of plug valve bodies in the cylinder body. The plug valve core is limited in the plug valve seat body through a plug valve cover. There are two through holes on the side wall of the plug valve body. One through hole of the upper layer plug valve body is communicated with the pressurized water steam inlet, one through hole of the middle layer plug valve body is communicated with the steam condensate inlet, and one through hole of the lower layer plug valve body is communicated with the steam condensate outlet. The upper layer plug valve core controls the opening and closing of the pressurized water steam inlet, the middle layer plug valve core controls the opening and closing of the steam condensate inlet, and the lower layer plug valve core controls the opening and closing of the steam condensate outlet. Above the upper cover, there is a cylinder driving component to drive the coaxial connecting rod to rotate. A liquid level sensor is arranged inside the sealed hollow cylindrical structure. The top end of the liquid level sensor is connected to the upper cover, and the lower end of the liquid level sensor extends downward to the bottom of the cylinder body. The signal transmitted by the liquid level sensor is input into a programmed intelligent controller, and the controller issues an instruction to control the cylinder driving component to drive the coaxial connecting rod to rotate.

[0008] Further technology of the present invention:

[0009] Preferably, the upper cover is connected to the cylinder driving component through a cylinder connection component. The cylinder driving component drives a square head connecting rod, and a square head is provided at the top of the coaxial connecting rod, and the square head is docked with the square head connecting rod.

[0010] Preferably, a perforation is provided on the plug valve core. Under normal conditions of the coaxial connecting rod, the perforation of the middle layer plug valve core is communicated with the through hole of the middle layer plug valve body, the steam condensate inlet is opened to allow condensate water to enter, the perforation of the upper layer plug valve core is misaligned with the through hole of the upper layer plug valve body, and the perforation of the lower layer plug valve core is misaligned with the through hole of the lower layer plug valve body, so as to close the steam condensate outlet and the pressurized water steam inlet to block the discharge of steam;

[0011] When the steam trap valve core is rotated forward by 90 degrees, the perforation of the middle layer plug valve core is misaligned with the through hole of the middle layer plug valve body, the steam condensate inlet is closed, the perforation of the upper layer plug valve core is communicated with the through hole of the upper layer plug valve body, the perforation of the lower layer plug valve core is communicated with the through hole of the lower layer plug valve body, the steam condensate outlet and the pressurized water steam inlet are opened, and the condensate water is pressed out.

[0012] Preferably, a temperature sensor is further arranged inside the sealed hollow cylindrical structure. The top end of the temperature sensor is connected to the upper cover, and the lower end of the temperature sensor extends downward to the bottom of the cylinder body to sense the temperature of the condensate water.

[0013] Preferably, vertical slideways are provided on the inner wall of the cylinder body, and the three layers of plug valve bodies are slid into the cylinder body from the vertical slideways during assembly.

[0014] The beneficial effects of the present invention are as follows:

[0015] It can recover the steam condensate under pressure back to the boiler station with the original pressure, which not only prevents the secondary flashing of the original atmospheric-pressure recovery steam trap and wastes a certain amount of heat energy, but also recovers the boiler circulating water to achieve balance, with obvious energy-saving effects; maximizing energy conservation also improves the high-temperature production environment, bringing great benefits to both people and control equipment.

[0016] It can drain water in a timely and sufficient manner, reducing the occurrence of accidents where the upstream heat exchange surface may be flooded due to poor drainage and affecting heat exchange. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings;

[0018] Figure 1 It is a front view sectional schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure A-A of the present invention;

[0020] Reference numerals: 10, cylinder body; 11, flat bottom head; 12, upper cover; 13, coaxial connecting rod; 14, plug valve core; 15, plug valve body; 16, plug valve cover; 17, through hole; 18, cylinder drive assembly; 19, liquid level sensor; 20, cylinder connection assembly; 21, square head connecting rod; 22, perforation; 23, temperature sensor; 24, vertical slideway; 25, sewage valve assembly. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] Such as Figure 1-2, Embodiment 1: An intelligent steam heat exchange condensate steam trap device comprises a sealed hollow cylindrical structure composed of a cylinder body 10, a flat bottom head 11 and an upper cover 12. A steam condensate inlet, a steam condensate outlet, a pressurized water steam inlet and an exhaust port are provided on the side wall of the cylinder body 10. Inside the sealed hollow cylindrical structure, there are three layers of plug valve cores 14, namely an upper, a middle and a lower layer, connected by a coaxial connecting rod 13. There are three layers of plug valve bodies 15 in the cylinder body 10. The plug valve core 14 is limited in the plug valve body 15 by a plug valve cover 16. Two through holes 17 are provided on the side wall of the plug valve body 15. One through hole 17 of the upper layer plug valve body 15 is communicated with the pressurized water steam inlet, one through hole 17 of the middle layer plug valve body 15 is communicated with the steam condensate inlet, and one through hole 17 of the lower layer plug valve body 15 is communicated with the steam condensate outlet. The upper layer plug valve core 14 controls the opening and closing of the pressurized water steam inlet, the middle layer plug valve core 14 controls the opening and closing of the steam condensate inlet, and the lower layer plug valve core 14 controls the opening and closing of the steam condensate outlet. Above the upper cover 12, there is a cylinder driving assembly 18 to drive the coaxial connecting rod 13 to rotate. A liquid level sensor 19 is arranged inside the sealed hollow cylindrical structure. The top of the liquid level sensor 19 is connected to the upper cover 12, and the lower end of the liquid level sensor 19 extends downward to the bottom inside the cylinder body 10. The signal transmitted by the liquid level sensor 19 is input into a programmed intelligent controller, and the controller issues an instruction to control the cylinder driving assembly 18 to drive the coaxial connecting rod 13 to rotate.

[0023] In this embodiment, a sewage valve assembly 25 is provided on the flat bottom head 11 for discharging the water inside the sealed hollow cylindrical structure.

[0024] The cylinder driving assembly 18 is connected to the upper cover 12 through a cylinder connecting assembly 20. The cylinder driving assembly 18 drives a square head connecting rod 21. A square head is provided at the top of the coaxial connecting rod 13, and the square head is docked with the square head connecting rod 21.

[0025] A through hole 22 is provided on the plug valve core 14. Under normal conditions of the coaxial connecting rod 13, the through hole 22 of the middle layer plug valve core 14 is communicated with the through hole 17 of the middle layer plug valve body 15, the steam condensate inlet is opened to allow condensate water to enter, the through hole 22 of the upper layer plug valve core 14 is misaligned with the through hole 17 of the upper layer plug valve body 15, and the through hole 22 of the lower layer plug valve core 14 is misaligned with the through hole 17 of the lower layer plug valve body 15, so that the steam condensate outlet and the pressurized water steam inlet are closed to block the discharge of steam;

[0026] When the steam trap valve core is rotated forward by 90 degrees, the through hole 22 of the middle layer plug valve core 14 is misaligned with the through hole 17 of the middle layer plug valve body 15, the steam condensate inlet is closed, the through hole 22 of the upper layer plug valve core 14 is communicated with the through hole 17 of the upper layer plug valve body 15, the through hole 22 of the lower layer plug valve core 14 is communicated with the through hole 17 of the lower layer plug valve body 15, the steam condensate outlet and the pressurized water steam inlet are opened, and the condensate water is pressed out.

[0027] Inside the sealed hollow cylindrical structure, there is also a temperature sensor 23. The top end of the temperature sensor 23 is connected to the upper cover 12, and the lower end of the temperature sensor 23 extends downward to the bottom inside the cylinder 10. The temperature sensor 23 senses the temperature of the condensed water.

[0028] Vertical slideways 24 are provided on the inner wall of the cylinder 10, and the upper, middle, and lower three-layer cock valve bodies 15 slide into the cylinder 10 from the vertical slideways 24.

[0029] The principle is that when the condensed water has not entered, the valve core is in a state where the condensed water inlet is open, and the condensed water outlet and the compressed water steam port are closed, so as to block the discharge of steam. When steam condensed water enters and reaches a certain liquid level, the signal transmitted by the liquid level sensor is input into the programmed intelligent controller. The controller issues an instruction, and through the cylinder drive assembly, the coupling shaft of the three-layer valve core is rotated. The drain valve core is rotated forward by 90 degrees, the condensed water inlet is closed, and the condensed water outlet and the compressed water steam port are in an open state, so as to press out the condensed water and at the same time block the discharge of the upstream heat exchange steam. At this time, the condensed water is pushed out of the cylinder by the pressure of the compressed water steam. When the water level drops to the lower limit liquid level, the signal transmitted by the liquid level sensor is input into the programmed intelligent controller. The controller issues an instruction, and through the pneumatic drive head, the coupling shaft of the three-layer valve core is rotated. The drain valve core is rotated backward by 90 degrees, the condensed water inlet is opened, and the condensed water outlet and the compressed water steam port are closed, so as to continue to admit condensed water and at the same time block the discharge of the upstream heat exchange steam. It achieves the function of draining water only without discharging steam. It works in this way repeatedly, intermittently discharging and recovering the steam condensed water from the heat exchanger.

[0030] Through its unique mechanical structure, the liquid level is sensed by the liquid level sensor, and at the same time, the drainage volume each time is calculated (which could not be achieved by conventional mechanical water conveyors). At the same time, the temperature sensor senses the temperature of the condensed water. In the above-mentioned known state of excluding the quality, temperature, and corresponding density of the condensed water, the controller can calculate the corresponding heat exchange amount of the condensed water through the heat release mathematical model program. Through the calculation of the heat exchange amount, the controller can further calculate the amount of water evaporated from the upstream heat exchanger through the heat release mathematical model program. Then, based on the amount of evaporated water, the controller can further calculate the change in the concentration of the soluble solids in the upstream heat exchanger through the evaporation heat exchange mathematical model program, thereby intelligently judging the end point of the solid matter solution evaporation process and avoiding the huge investment in the past for manual concentration measurement or online concentration detection inlet sensors.

[0031] The advantages of the technology of the present invention are as follows: First, it is energy-saving. The characteristic of this mechanical structure is that it can recover the steam condensed water under the original steam pressure to the boiler station, which not only prevents the secondary flash evaporation of the original atmospheric pressure recovery steam trap and wastes a certain amount of heat energy, but also recovers the boiler circulating water, making it reach a balance, and the energy-saving effect is obvious. The maximum energy-saving also improves the high-temperature production environment, bringing great benefits to both people and control equipment.

[0032] The technology of the present invention can drain water in a timely and sufficient manner, reducing the occurrence of accidents where the upstream heat exchange surface may be flooded due to poor water drainage, which affects heat exchange.

[0033] Due to the adoption of artificial intelligence technology of automatic sensing, automatic control and intelligent judgment, the technology of the present invention can automatically sense and judge the working states of the upstream and downstream through the working conditions at this point, and can also provide high-quality control data for the process units of the upstream and downstream, thus realizing intelligence.

[0034] I. Mathematical calculation models of condensate water volume corresponding to steam heat release, water evaporation amount from solution evaporation, and solid content concentration of liquid material

[0035] 1. Mathematical relationship between condensate water volume and steam heat release

[0036] ① Mathematical relationship between steam volume corresponding to steam condensate water volume

[0037] During steam heat exchange, latent heat of vaporization is released during the phase change, and its temperature remains unchanged, and the mass of vapor and liquid is equal.

[0038] That is, G 汽 = G 凝水

[0039] G 凝水 —— Mass of steam condensate water (kg)

[0040] G 汽 —— Mass of corresponding steam (kg)

[0041] ② Mathematical relationship of total heat release during steam heat exchange

[0042] R 汽 = G 汽 × r 温汽 = G 凝水 × r 温水

[0043] R 汽 —— Latent heat of vaporization released by steam liquefaction (kj)

[0044] G 凝水 —— Mass of steam corresponding to condensate water (kg, this parameter is measured and output by the steam trap.)

[0045] r 温水 —— Latent heat of vaporization of steam (kj / kg, at the corresponding temperature)

[0046] ③ Mathematical relationship between latent heat of vaporization of steam and temperature (0.15 - 0.51 MPa, usage range for liquid material evaporation)

[0047] r 温水 = 2202 + 2.935(t汽 -120.23)

[0048] r 温水 —— Latent heat of vaporization of steam (kJ / kg, at the corresponding temperature)

[0049] t 温水 —— Temperature of steam condensate (°C, measured online by the trap temperature sensor for this parameter.)

[0050] ④ Heat release mathematical model: Heat transfer quantity corresponding to condensate

[0051] R 汽 = G 凝水 × r 温水

[0052] R 汽 = G 凝水 × [2202 + 2.935(t 汽 - 120.23)]

[0053] 2. Mathematical relationship of the amount of water evaporated by the heat exchanger

[0054] Based on the heat transfer quantity calculated by the above mathematical model, the amount of water evaporated from the solid content solution is deduced.

[0055] Based on, R 蒸水 = R 汽

[0056] = G 蒸水 × r 蒸水

[0057] It is deduced that, G 蒸水 = R 蒸水 / r 蒸水

[0058] G 蒸水 = R 蒸水 / 2258

[0059] G 蒸水 —— Mass of water evaporated from the soluble solid content solution (kg)

[0060] r 蒸水 —— Latent heat of vaporization of water vapor (2258 kJ / kg at room temperature))

[0061] R 蒸水 —— Heat of vaporization required to evaporate water (kJ)

[0062] 3. Mathematical relationship of the concentration of the liquid after evaporation

[0063] Based on the principle that the content of solid matter in the liquid remains unchanged throughout the evaporation process,[[]]

[0064] Then, G 料始 × η 始 = G 料终 × η 终， G 料终 = G 料始 - G 蒸水

[0065] G 料始 × η 始 = (G 料始 - G 蒸水 ) × η 终

[0066] It is derived that η 终 = G 料始 × η 始 / (G 料始 - G 蒸水 )

[0067] G 料始 —— Initial evaporation mass of the feed liquid (kg, known value)

[0068] η 始 —— Initial evaporation mass concentration of the feed liquid (%, known value)

[0069] G 蒸水 —— Mass of the evaporated water (kg, model calculation value)

[0070] η 终 —— Mass concentration of the shaped feed liquid at the end of evaporation (%, calculated value)

[0071] When the cumulative amount of condensate water discharged by the intelligent steam trap reaches the calculated value of the above formula through on-line detection, the evaporation of water in the heat exchange of the feed liquid reaches the concentration requirement of shaping. That is to say, the amount of condensate water discharged by the intelligent steam trap corresponds to the concentration of the shaped feed liquid. When the cumulative amount of condensate water discharged detected by the intelligent steam trap reaches the calculated value, the heating and evaporation process ends. Thus, it reflects the intelligent control method using a mathematical model, automatically realizing the intelligent control of the heat exchange and evaporation concentration process of the feed liquid, and overcoming the defects of traditional semi-artificial control.

[0072] In the present invention, unless there are clear regulations and limitations, the features are interlaced with each other and do not necessarily exist independently. The above display and description include the basic principles, main features and advantages of the present invention. Those skilled in the art should know that the present invention is not limited to the limitations of the above embodiments. The above embodiments and the description are only the preferred examples of the present invention, rather than being used to limit the present invention to be the only option. Under the requirements of the spirit and scope of the invention, the present invention can be further changed and optimized. The improvements and optimizations made to the present invention all fall within the scope of the present invention claimed. The specific scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent steam heat exchange condensate steam trap device, characterized in that: It includes a sealed hollow cylindrical structure composed of a cylinder body, a flat bottom head and an upper cover. The side wall of the cylinder body is provided with a steam condensate inlet, a steam condensate outlet, a pressure water steam inlet and an exhaust port. Inside the sealed hollow cylindrical structure, there are upper, middle and lower three-layer plug valve cores connected by a coaxial connecting rod. There are upper, middle and lower three-layer plug valve bodies in the cylinder body. The plug valve core is limited in the plug valve body through a plug valve cover. There are two through holes on the side wall of the plug valve body. One through hole of the upper-layer plug valve body is communicated with the pressure water steam inlet, one through hole of the middle-layer plug valve body is communicated with the steam condensate inlet, and one through hole of the lower-layer plug valve body is communicated with the steam condensate outlet. The upper-layer plug valve core controls the opening and closing of the pressure water steam inlet, the middle-layer plug valve core controls the opening and closing of the steam condensate inlet, and the lower-layer plug valve core controls the opening and closing of the steam condensate outlet. Above the upper cover, there is a cylinder drive assembly to drive the coaxial connecting rod to rotate. Inside the sealed hollow cylindrical structure, there is a liquid level sensor. The top of the liquid level sensor is connected to the upper cover, and the lower end of the liquid level sensor extends downward to the bottom of the cylinder body. The signal transmitted by the liquid level sensor is input into a programmed intelligent controller, and the controller issues an instruction to control the cylinder drive assembly to drive the coaxial connecting rod to rotate; There is a perforation on the plug valve core. Under normal conditions of the coaxial connecting rod, the perforation of the middle-layer plug valve core is communicated with the through hole of the middle-layer plug valve body, the steam condensate inlet is opened to let in condensate, the perforation of the upper-layer plug valve core is misaligned with the through hole of the upper-layer plug valve body, and the perforation of the lower-layer plug valve core is misaligned with the through hole of the lower-layer plug valve body, so that the steam condensate outlet and the pressure water steam inlet are closed to block the discharge of steam; When the steam trap valve core is rotated forward by 90 degrees, the perforation of the middle-layer plug valve core is misaligned with the through hole of the middle-layer plug valve body, the steam condensate inlet is closed, the perforation of the upper-layer plug valve core is communicated with the through hole of the upper-layer plug valve body, the perforation of the lower-layer plug valve core is communicated with the through hole of the lower-layer plug valve body, the steam condensate outlet and the pressure water steam inlet are opened, and the condensate is pressed out; There is a vertical slideway on the inner wall of the cylinder body. When assembling, the upper, middle and lower three-layer plug valve bodies are slid into the cylinder body from the vertical slideway.

2. The intelligent steam heat exchange condensate steam trap device according to claim 1, characterized in that: The upper cover is connected with a cylinder control assembly through a cylinder connection assembly. The cylinder drive assembly drives a square head connecting rod, and there is a square head at the top of the coaxial connecting rod, and the square head is butted with the square head connecting rod.

3. The intelligent steam heat exchange condensate steam trap device according to claim 1, characterized in that: There is also a temperature sensor inside the sealed hollow body structure. The top of the temperature sensor is connected to the upper cover, and the lower end of the temperature sensor extends downward to the bottom of the cylinder body. The temperature sensor senses the temperature of the condensate.

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