Hairpin type efficient steam cooler with adjustable feed water flow

Abstract

The utility model relates to a hairpin type efficient steam cooler with adjustable feed water flow, which comprises a U-shaped elbow, straight section shells and tube pass end sockets, two ends of the U-shaped elbow are respectively connected with one end of one straight section shell, and the other ends of the two straight section shells are hermetically connected with one tube pass end socket; a tube pass inlet and a tube pass outlet are formed in the two tube pass end sockets respectively, the opposite sides of the two tube pass end sockets are connected with throttling orifice plate flanges through vertical pipelines, the throttling orifice plate flanges and the vertical pipelines on the two sides form a return pipeline, and a valve capable of controlling the opening degree is arranged on the downstream of the return pipeline. According to the cooler, the advantages of an existing hairpin type heat exchanger are integrated, the return pipeline provided with the throttling orifice plate flange is additionally arranged between the tube pass inlet and the tube pass outlet on the basis of the hairpin type heat exchanger, convenient flow adjusting operation is achieved, and therefore the application requirement for adjusting flow under more complex working conditions is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to hairpin heat exchange technical field, concretely relates to a hairpin high -efficient steam cooler of water supply flow adjustable. BACKGROUND

[0002] In the field of power station auxiliary heat exchange technology, the demand for efficient, reliable and adaptable steam coolers is growing. The traditional steam cooler adopts a U-shaped tube shell structure with built-in throttle orifice plates, but in actual operation, due to the gap between theoretical calculation and actual situation of flow distribution, the operator needs to disassemble the manhole of the steam cooler and enter the water chamber to adjust the size of the throttle orifice, which is laborious and time-consuming. Secondly, the traditional U-shaped tube shell structure, the steam outside the tube and the water inside the tube are not pure counter flow, which causes temperature difference loss, resulting in a large heat exchange area and waste of materials. In addition, the U-shaped tube shell single tube plate structure is prone to significant thermal stress concentration due to its large thickness, and is prone to fatigue failure during power station peak shaving operation.

[0003] The hairpin steam cooler is an innovative tube shell steam cooler, characterized by a hairpin-shaped pipe that allows two fluids of different temperatures to fully contact and exchange heat efficiently. This design not only improves the overall performance of the heat exchanger, but also makes the structure more compact and reduces manufacturing costs. Its design concept is based on the deep understanding and improvement of the limitations of traditional U-shaped tube shell steam coolers. Traditional U-shaped tube shell steam coolers can only achieve partial counter flow, limiting the improvement of heat transfer efficiency. The hairpin steam cooler, through its unique design, realizes pure counter flow heat exchange of fluids in the pipe, greatly improving the heat transfer efficiency. By decomposing the traditional U-shaped tube shell steam cooler single tube plate into a hairpin steam cooler double tube plate assembly, the thermal mechanical stress is reduced through stress dispersion, effectively improving the problem of fatigue failure during power station peak shaving operation.

[0004] However, the existing hairpin heat exchanger still has some deficiencies in design, such as the need to improve the convenience of cleaning and maintenance of some products and the problem of flow regulation. These problems limit the application of hairpin heat exchangers in a wider field. INVENTION CONTENTS

[0005] In view of the deficiencies in the above background technology, the technical problem to be solved by the present utility model is to provide a hairpin high -efficient steam cooler of water supply flow adjustable. The cooler combines the advantages of existing hairpin heat exchangers and adds a return pipe with a throttle orifice plate flange between the inlet and outlet of the tube, realizing convenient flow regulation operation, thus meeting the application requirements of flow regulation under more complex conditions.

[0006] The utility model discloses a technical scheme that solves the technical problem:

[0007] A hairpin type high-efficiency steam cooler with adjustable water supply flow, comprising a U-shaped bend, a straight section shell, a tube pass header, one end of the U-shaped bend is connected with one end of one straight section shell respectively, and the other end of the two straight section shells is sealingly connected with one tube pass header; a tube pass inlet and a tube pass outlet are arranged on the two tube pass headers respectively, and the opposite side of the two tube pass headers is connected with a throttling orifice flange through a vertical pipeline, the throttling orifice flange and the vertical pipelines on both sides form a back-cleaning pipeline, and a valve capable of controlling opening degree is arranged downstream of the back-cleaning pipeline.

[0008] Further, the throttling orifice flange is internally provided with an upstream PLC control valve and a downstream PLC control valve respectively installed on both sides;

[0009] Both the two PLC control valves are provided with a position feedback sensor, at least one of a temperature sensor, a pressure sensor or a flow sensor is arranged on the vertical pipeline outside the two PLC control valves and close to the PLC control valves, the temperature sensor, the pressure sensor, the flow sensor and the position feedback sensor are electrically connected with a PLC controller, and the power end of the PLC control valve is electrically connected with the PLC controller.

[0010] Further, the PLC controller is installed in a control cabinet in an industrial environment.

[0011] Further, the PLC control valve is an electric control valve or a pneumatic control valve.

[0012] Further, the throttling orifice flange comprises a flange part and a throttling orifice plate, the throttling orifice plate comprises a hole plate matched with the cross section of the pipeline and an extension part used for fixing with the edge of the flange.

[0013] Further, the throttling orifice plate is a single-plate hole throttling orifice plate or a multi-plate hole throttling orifice plate.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] Compared with the prior art, the utility model realizes pure counterflow heat exchange.

[0016] The utility model changes the single tube plate of the prior art U-shaped steam cooler into the double tube plate structure of the hairpin type heat exchanger, thereby effectively reducing the thermal stress.

[0017] The utility model maintains the advantages of the traditional hairpin type heat exchanger, and improves the overall energy utilization rate through the back-cleaning pipeline.

[0018] In this invention, a PLC (Programmable Logic Controller) is preferably used in combination with the return pipe to precisely regulate the water supply flow. The PLC controller can monitor the internal temperature distribution, flow rate, or pressure of the return pipe in real time through corresponding sensors and adjust the proportion of the return fluid accordingly. Using a throttling orifice plate in conjunction with the PLC-controlled valve allows for a higher flow velocity in the return fluid, enhancing turbulence and reducing uneven temperature distribution. This ensures uniform mixing of the return fluid and the added fluid, reducing scaling and extending equipment life.

[0019] In this invention, the return pipe allows the cleaning fluid to enter from the pipe side, and the cleaning fluid can circulate inside the pipe, making cleaning more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Figure 1 This is a schematic diagram of the structure of a hairpin-type high-efficiency steam cooler with adjustable water flow rate according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of a hairpin-type high-efficiency steam cooler with adjustable water flow rate according to one embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional structural diagram of a hairpin-type high-efficiency steam cooler with adjustable water flow rate according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of a throttling orifice plate according to an embodiment of the present invention, wherein (a) is a single-plate orifice throttling orifice plate; and (b) is a multi-plate orifice throttling orifice plate.

[0025] In the figure, 1 is a U-shaped elbow, 2 is a first straight section shell, 3 is a first support, 4 is a second support, 5 is a first shell-side connector, 6 is a first pipe-side connector, 7 is a first pipe-side end cap, 8 is a flange with a throttling orifice plate, 9 is a second pipe-side end cap, 10 is a second pipe-side connector, 11 is a second shell-side connector, and 12 is a second straight section shell. Detailed Implementation

[0026] In order to make the person in the technical field better understand the utility model scheme, the utility model is further explained in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0027] Embodiment 1

[0028] The water flow adjustable hairpin type high-efficiency steam cooler (see Figures 1-3 ), including U-shaped elbow 1, first straight section shell 2, first support 3, second support 4, first shell side pipe 5, first tube side pipe 6, first tube side head 7, flange 8 provided with throttle orifice plate, second tube side head 9, second tube side pipe 10, second shell side pipe 11, second straight section shell 12, both ends of the U-shaped elbow 1 are fixedly connected with the left ends of the first straight section shell 2 and the second straight section shell 12 respectively; the first support 3 and the second support 4 are connected with the first straight section shell 2 and the second straight section shell 12 side by side at the same time, and the first support and the second support are fixedly connected with the ground to provide support for the whole cooler. The first shell side pipe 5 is installed on the right end side of the first straight section shell, and the second shell side pipe 11 is installed on the right end side of the second straight section shell. The right ends of the first straight section shell 2 and the second straight section shell 12 are fixedly connected with the first tube side head 7 and the second tube side head 9 respectively through the direct welding pipe plate mode. The first tube side pipe 6 and the second tube side pipe 10 are respectively installed on the outer sides of the first tube side head 7 and the second tube side head 9.

[0029] The first tube side head 7 and the second tube side head 9 are connected through two vertical pipes on the opposite sides, and the two vertical pipes are sealed and fixed in communication through the flange 8 provided with the throttle orifice plate.

[0030] The PLC control valve controlled by the PLC controller is added between the first tube side head 7 and the flange 8 provided with the throttle orifice plate and between the second tube side head 9 and the flange 8 provided with the throttle orifice plate respectively.

[0031] Embodiment 2

[0032] The PLC controller in the embodiment is selected from a type suitable for an industrial environment, such as a Siemens S7-200, etc. The PLC control valve is used as an actuator, and different power types are selected according to flow, such as an electric type for small flow, an electric control valve is used to achieve fast response speed, and a pneumatic type for large flow, a pneumatic control valve is used to achieve high reliability. The PLC control valve is provided with a position feedback sensor to ensure that the opening of the valve is consistent with the PLC output signal. Temperature sensors, pressure sensors and flow sensors are arranged on the outside of the PLC control valve and close to the vertical pipeline of the PLC control valve, so as to accurately control the opening of the valve. The cooler is also provided with a power supply device, and the power supply device supplies power to the PLC controller and the PLC control valve. When installing, the travel range of the PLC control valve needs to be manually adjusted to ensure that the opening of the valve is consistent with the output of the PLC controller. The PLC controller is installed in the control cabinet to ensure good ventilation and to be away from the electromagnetic interference source.

[0033] Embodiment 3

[0034] The flange provided with the orifice plate in the embodiment includes a flange part and an orifice plate, the flange part is used for sealing connection with a vertical pipeline, and the orifice plate includes a hole plate matched with the cross section of the pipeline and an extension part used for fixing with the edge of the flange. Figure 4 Different types of orifice plates are selected according to working conditions and media. Since the flow in the back-cleaning pipeline in the utility model is too large and is mixed with inlet fluid, which seriously affects the heat exchange efficiency, the flow in the back-cleaning pipeline needs to be small, and in most cases, an orifice plate with a single-hole circular hole can be selected, as shown in (a) of FIG. 1. Figure 4 If the back-cleaning fluid flow is large, a multi-hole orifice plate is used to prevent uneven mixing, as shown in (b) of FIG. 1. Figure 4

[0035] In the utility model, the first shell side connection pipe and the second shell side connection pipe can be selected as the shell side inlet or the shell side outlet according to working conditions, and the first tube side connection pipe and the second tube side connection pipe can also be selected as the tube side inlet or the tube side outlet according to working conditions. Hereinafter, the working process of the utility model is described by taking the first shell side connection pipe as the shell side inlet, the second shell side connection pipe as the shell side outlet, the first tube side connection pipe as the tube side inlet and the second tube side connection pipe as the tube side outlet. Specifically, the shell side medium enters from the first shell side connection pipe 5, sequentially flows through the gap outside the internal connection pipe of the first straight section shell 2, the U-shaped elbow 1, the gap outside the internal connection pipe of the second straight section shell 12, and flows out from the second shell side connection pipe 11. This flow path is called the shell side.

[0036] ​The tube-side medium enters from the first tube-side connecting pipe 6, flows through the first tube-side head 7, the tube sheet, the internal connecting pipe of the first straight section shell 2, the U-shaped bend 1, the internal connecting pipe of the second straight section shell 12, the tube sheet, and then enters the second tube-side head 9, and part of the medium flows out from the second tube-side connecting pipe 10, and part of the medium flows back to the condenser through the pipeline provided with the throttling orifice plate flange 8. This flow path is referred to as the tube side.

[0037] The proportion of the condenser part is controlled by controlling the PLC control valve downstream of the throttling orifice plate in the channel (in this embodiment, downstream refers to between the first tube-side head 7 and the throttling orifice plate flange 8, and upstream refers to between the second tube-side head 9 and the throttling orifice plate flange 8), and the PLC control valve upstream of the throttling orifice plate is fully opened or coarsely adjusted according to the flow direction of the tube-side medium, and the opening degree of the PLC control valve downstream of the throttling orifice plate is adjusted to achieve the purpose of controllable flow. The condenser pipeline re-introduces the cold fluid at the outlet of the tube side to the inlet to form an internal circulation. By adjusting the proportion of the condenser fluid, the sum of the amount of fresh fluid actually entering the tube side and the amount of condenser fluid can be changed, thereby indirectly regulating the total flow of the tube side. The flow superposition principle is Q 总 = Q 新 + Q 回 , wherein:

[0038] Q 新 : the fresh fluid flow (main flow) pumped from the outside;

[0039] Q 回 : the fluid flow returned through the condenser pipeline.

[0040] By adjusting Q 回 , Q 总 can be controlled, that is, when Q 新 is fixed, the total flow can be flexibly adjusted. Generally, when the hairpin high-efficiency steam cooler is used and connected with upper and lower equipment, the total flow is generally controlled by the main pump, and the working condition of the main pump is generally kept unchanged. In this embodiment, the internal total flow can be adjusted by adjusting the condenser fluid.

[0041] Embodiment 4

[0042] The water flow adjustable hairpin high-efficiency steam cooler in this embodiment comprises a U-shaped bend, straight section shells, and tube-side heads, the two ends of the U-shaped bend are respectively connected to one end of one straight section shell, the other end of the two straight section shells is respectively sealed and connected to one tube-side head through a flange; a tube-side inlet and a tube-side outlet are respectively arranged on the two tube-side heads, the flanges provided with throttling orifice plates are connected to the vertical pipelines on the opposite sides of the two tube-side heads, and the flanges provided with throttling orifice plates and the vertical pipelines on the two sides constitute condenser pipelines, and valves capable of controlling the opening degree are arranged downstream of the condenser pipelines.

[0043] The utility model discloses, due to the setting of the back to the cage pipeline, can break the laminar effect of the pipe course entrance with faster flow rate, make it can even mix, reduce the gradient of entrance temperature, can also effectively prolong the service life of material.

[0044] The utility model is not applicable to the prior art.

Claims

1. A hairpin-type high-efficiency steam cooler with adjustable feedwater flow rate, comprising a U-shaped elbow, straight shell sections, and tube-side end caps, wherein the two ends of the U-shaped elbow are respectively connected to one end of a straight shell section, and the other ends of the two straight shell sections are sealed to a tube-side end cap; a tube-side inlet and a tube-side outlet are respectively provided on the two tube-side end caps, characterized in that, Two pipe pass head opposite sides are connected by vertical pipeline with orifice flange, with orifice flange and the vertical pipeline on both sides constitute the back latticing pipeline, downstream of the back latticing pipeline is provided with the valve that can control the opening.

2. The hairpin high efficiency steam cooler with adjustable feedwater flow according to claim 1, characterized in that, The inside of the orifice flange is respectively equipped with upstream PLC control valve and downstream PLC control valve; Both PLC control valves are equipped with position feedback sensor, at least one of temperature sensor, pressure sensor or flow sensor is arranged on the vertical pipeline outside the two PLC control valves and close to the PLC control valve, the temperature sensor, pressure sensor, flow sensor and position feedback sensor are electrically connected with the PLC controller, the power end of the PLC control valve is electrically connected with the PLC controller.

3. The hairpin high efficiency steam cooler with adjustable feedwater flow according to claim 2, characterized in that, The PLC controller is installed in the control cabinet of industrial environment.

4. The hairpin high efficiency steam cooler with adjustable feedwater flow according to claim 2, wherein, The PLC control valve is electrically controlled valve or pneumatically controlled valve.

5. The hairpin high efficiency steam cooler with adjustable feedwater flow according to claim 1, wherein, The orifice flange includes flange part and orifice plate, the orifice plate includes hole plate matched with pipeline section and extension part for fixing with flange edge.

6. The hairpin high efficiency steam cooler with adjustable feedwater flow according to claim 5, characterized in that, The orifice plate is single plate orifice plate or multi plate orifice plate.

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