Flash steam recycling system

Abstract

The utility model discloses a flash steam recycling system which is used for reducing generation of scale in a hot water tank and lowering the maintenance cost of equipment. The device comprises a condensate water tank, a fan vacuum system and a steam pipe, a steam outlet is formed in the top of the condensate water tank, one end of the steam pipe is connected with the steam outlet, the other end of the steam pipe extends into the fan vacuum system and is communicated with an air inlet in the fan vacuum system, and the steam pipe is used for conveying flash steam generated in the condensate water tank into the fan vacuum system; and a regulating valve is arranged on the steam pipe and is used for controlling the steam pipe to be opened and closed.

Description

Technical Field

[0001] The present application relates to the technical field of energy recovery and utilization, and in particular to a flash steam recovery and utilization system. Background Art

[0002] In the papermaking industry, condensate tanks are often used as a device for heat recovery and water resource management. The effective operation of condensate tanks plays a key role in improving overall energy efficiency, reducing energy consumption, and lowering maintenance costs. In traditional papermaking processes, the flash steam generated by the condensate tank (i.e., the steam released after the high-temperature condensate is rapidly depressurized) is usually recovered into the hot water tank for treatment through a hydraulic ejector using the Venturi effect. During the recovery process, the hydraulic ejector relies on the negative pressure area formed by the high-pressure water flow at the throat to attract and extract the flash steam. This not only realizes the recovery and utilization of the heat energy in the flash steam, but also promotes the drainage efficiency of other equipment in the papermaking process by forming a small vacuum.

[0003] However, since hot water tanks require regular replenishment of fresh water to maintain water levels and system stability, the minerals and impurities contained in fresh water are easily precipitated under high temperature and high pressure and deposited on components such as the hot water tank, circulation pipes, pumps, and valves, forming scale that is difficult to remove. The formation of scale not only reduces heat transfer efficiency and affects system performance, but also increases the complexity and cost of equipment maintenance.

[0004] Based on this, the present application proposes a flash steam recovery and utilization system to solve the technical problems caused by the above-mentioned scale. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a flash steam recovery and utilization system, which can reduce the generation of scale in the hot water tank and reduce the cost of equipment maintenance.

[0006] The present application provides a flash steam recovery and utilization system, comprising:

[0007] Condensate tank, fan vacuum system and steam pipe; a steam outlet is provided on the top of the condensate tank, one end of the steam pipe is connected to the steam outlet, and the other end extends into the fan vacuum system and is connected to the air inlet in the fan vacuum system. The steam pipe is used to transport the flash steam generated in the condensate tank to the fan vacuum system; a regulating valve is provided on the steam pipe, and the regulating valve is used to control the opening and closing of the steam pipe.

[0008] Optionally, the condensate tank is provided with a drain pipe, a safety valve is provided in the drain pipe, and the drain pipe is used to discharge the flash steam in the condensate tank into the air.

[0009] Optionally, a muffler is provided at the end of the exhaust pipe, and the muffler is detachably connected to the exhaust pipe.

[0010] Optionally, a pressure detector is provided on the condensation water tank, and the pressure detector is used to detect the pressure in the condensation water tank.

[0011] Optionally, the recycling system also includes a condensate stabilization tank, and a water outlet is provided at the bottom of the condensate tank. The condensate stabilization tank and the water outlet are connected through a condensate pipe, so that the condensate in the condensate tank is discharged into the condensate stabilization tank along the condensate pipe.

[0012] Optionally, a condensate pump is provided on the condensate pipe.

[0013] Optionally, the steam outlet and the steam pipe are connected via a flange structure, and a sealing gasket is provided in the flange structure.

[0014] Optionally, a heat-insulating layer is fixed to the outside of the steam pipe.

[0015] Optionally, a steam separator is provided between the steam pipe and the fan vacuum system, and the steam separator is used to separate moisture and impurities in the steam.

[0016] It can be seen from the above technical solutions that this application has the following effects:

[0017] The present application proposes a flash steam recovery and utilization system, in which a steam pipe is led out from the steam outlet of the condensate tank, the steam pipe is extended to be connected to the fan vacuum system, and a regulating valve is provided on the steam pipe, which can control the opening and closing of the steam pipe. In this way, the flash steam in the condensate tank can be transmitted to the fan vacuum system for utilization. Compared with the existing technology, the present application does not use the hot water tank to recover the flash steam, thereby reducing the amount of fresh water added to the hot water tank, thereby reducing the scaling phenomenon in the hot water tank, and reducing the high cost problem caused by the cleaning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in this application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of a flash steam recovery and utilization system provided in this application;

[0020] Figure 2Another schematic diagram of a flash steam recovery and utilization system provided in this application;

[0021] Among them, there are condensate tank 01, fan vacuum system 02, steam pipe 03, steam outlet 04, regulating valve 05, paper machine wire section 06, emptying pipe 07, safety valve 08, muffler 09, pressure detector 10, condensate stabilization tank 11, condensate pipe 12, condensate pump 13, flange structure 14, steam separator 15, drying cylinder 16, and flash tank 17. DETAILED DESCRIPTION

[0022] In the present utility model, the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "transverse", and "longitudinal" are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or parts, and do not particularly limit the specific installation directions of the various components or parts.

[0023] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0025] In addition, the structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] Based on the existing problem of using hot water tanks to process flash steam, which results in a lot of scaling in the hot water tanks and high equipment maintenance costs, this application provides a flash steam recovery and utilization system to reduce scaling in the hot water tanks and lower equipment maintenance costs. The specific implementation process of this application is described below.

[0028] See also Figure 1 and Figure 2 , the present application provides a flash steam recovery and utilization system comprising:

[0029] Condensate tank 01, fan vacuum system 02 and steam pipe 03; a steam outlet 04 is provided on the top of the condensate tank 01, one end of the steam pipe 03 is connected to the steam outlet 04, and the other end extends into the fan vacuum system 02 and is connected to the air inlet in the fan vacuum system 02. The steam pipe 03 is used to transport the flash steam generated in the condensate tank 01 to the fan vacuum system 02; a regulating valve 05 is provided on the steam pipe 03, and the regulating valve 05 is used to control the opening and closing of the steam pipe 03.

[0030] Condensate Tank 01 collects condensed water generated during the papermaking process, such as high-temperature condensate from drying cylinder 16 and flash tank 17. During the condensation process in Condensate Tank 01, some steam rapidly vaporizes due to a sudden drop in pressure, forming flash steam. A steam outlet 04 is located at the top of Condensate Tank 01, allowing the flash steam within the tank to be released.

[0031] One end of the steam pipe 03 is tightly connected to the steam outlet 04 of the condensate tank 01, and the other end extends to the air inlet of the fan vacuum system 02. The steam pipe 03 transports the flash steam generated in the condensate tank 01 to the fan vacuum system 02 for further processing and utilization; a regulating valve 05 is fixed in the steam pipe 03. By controlling the opening degree of the regulating valve 05, the opening and closing of the steam pipe 03 can be controlled, and the flow rate of the flash steam can be adjusted.

[0032] The fan vacuum system 02 is connected to the paper machine wire section 06 and is used to provide vacuum suction to the paper machine wire section 06, thereby rapidly separating the pulp and water in the paper machine wire section 06. By introducing flash steam into the fan vacuum system 02, the energy contained in the flash steam (such as heat and pressure energy) is utilized to assist and enhance the functions of the fan vacuum system 02, such as increasing the vacuum level of the fan vacuum system 02, accelerating water removal, and reducing energy consumption. By directly introducing the flash steam into the fan vacuum system 02, the thermal energy of the flash steam can be effectively recovered and reused.

[0033] In this embodiment, the condensate tank 01 is connected to the fan vacuum system 02 through the steam pipe 03, so that the flash steam in the condensate tank 01 is discharged into the fan vacuum system 02 along the steam pipe 03. The fan vacuum system 02 uses the heat energy or kinetic energy contained in the flash steam to enhance its own function, thereby reducing the energy consumption of the fan vacuum system 02; secondly, compared with the prior art that uses a hot water tank to treat flash steam, the present application does not use a hot water tank, thereby reducing the amount of clean water added to the hot water tank, thereby reducing the probability of scaling caused by clean water, and solving the problem of high cost caused by cleaning scaling.

[0034] In an optional embodiment, a drain pipe 07 is provided on the condensed water tank 01 , and a safety valve 08 is provided in the drain pipe 07 . The drain pipe 07 is used to discharge the flash steam in the condensed water tank 01 into the air.

[0035] In this embodiment, condensate tank 01 is additionally equipped with a drain pipe 07. Drain pipe 07 is used to safely discharge flash steam from condensate tank 01 into the atmosphere in certain circumstances (such as when fan vacuum system 02 fails, is shut down for maintenance, or the flash steam volume exceeds the system's processing capacity). A safety valve 08 is installed within drain pipe 07. Safety valve 08 can be a pressure-sensitive device. When the pressure within condensate tank 01 exceeds a preset safety threshold, safety valve 08 automatically opens, allowing the flash steam to be quickly released into the atmosphere through drain pipe 07, thereby preventing damage to condensate tank 01 or safety accidents caused by overpressure.

[0036] In this optional embodiment, a muffler 09 is provided at the end of the exhaust pipe 07 , and the muffler 09 is detachably connected to the exhaust pipe 07 .

[0037] In this embodiment, a muffler 09 is added to the end of the exhaust pipe 07 to reduce the noise generated when the flash steam is discharged from the exhaust pipe 07. The muffler 09 is connected to the exhaust pipe 07 in a detachable manner (such as a snap connection, bolt connection, threaded connection, etc.) to facilitate installation, maintenance, and replacement.

[0038] In an optional embodiment, a pressure detector 10 is provided on the condensed water tank 01 , and the pressure detector 10 is used to detect the pressure in the condensed water tank 01 .

[0039] The pressure detector 10 is installed on the condensate tank 01. The pressure detector 10 can monitor and provide feedback on the pressure status in the condensate tank 01 in real time. By accurately measuring the pressure in the condensate tank 01, the pressure detector 10 can timely understand the status of the tank, so as to make corresponding adjustments or issue an alarm.

[0040] In an optional embodiment, the recycling system also includes a condensate stabilization tank 11, and a water outlet is provided at the bottom of the condensate tank 01. The condensate stabilization tank 11 and the water outlet are connected through a condensate pipe 12, so that the condensate in the condensate tank 01 is discharged into the condensate stabilization tank along the condensate pipe 12.

[0041] As condensate is collected and produced in condensate tank 01, its temperature, flow rate, and quality may fluctuate due to various factors. Condensate stabilization tank 11 is provided to buffer and regulate these fluctuations, ensuring consistent condensate quality and facilitating subsequent processing or reuse.

[0042] The bottom of the condensate tank 01 is provided with a water outlet, which is connected to the condensate stabilization tank 11 via a condensate pipe 12. When the condensate in the condensate tank 01 accumulates to a certain amount, it automatically flows into the condensate stabilization tank 11 through the water outlet and the condensate pipe 12. The condensate can flow naturally through the condensate pipe 12 by gravity or by pumping.

[0043] In this optional embodiment, a condensate pump 13 is provided on the condensate pipe 12. In this embodiment, the condensate pump 13 provides power to pump the condensate from the condensate tank 01 and transport it to the condensate stabilization tank 11. The condensate pump 13 can be a centrifugal pump, a volumetric pump, etc.

[0044] In an optional embodiment, the steam outlet 04 is connected to the steam pipe 03 via a flange structure 14 , and a sealing gasket is provided inside the flange structure 14 .

[0045] Flange structure 14 consists of two flanges and several bolts and nuts. One flange is connected to steam outlet 04, and the other is connected to steam pipe 03. The two flanges are bolted together, thus establishing communication between steam pipe 03 and condensate tank 01. Due to the high temperature and high pressure characteristics of steam, the sealing performance of the connection is extremely high. Therefore, a sealing gasket is installed inside flange structure 14. The gasket is located between the two flanges. When the bolts are tightened, the two flanges squeeze the gasket, thereby sealing the gap between the two flanges and preventing steam leakage. The gasket can be made of high-temperature and high-pressure resistant materials, such as asbestos, graphite, and metal.

[0046] To reduce heat loss during flash steam transportation, in an optional embodiment, an insulation layer is fixed to the outside of the steam pipe 03. The insulation layer can be made of materials with thermal insulation properties, high temperature resistance, corrosion resistance, and high mechanical strength, such as rock wool, glass wool, aluminum silicate, polyurethane, etc.

[0047] The insulation layer can be fixed by tying, pasting or wrapping to ensure that the insulation layer is stably fixed outside the steam pipe 03.

[0048] In an optional embodiment, a steam separator 15 is provided between the steam pipe 03 and the fan vacuum system 02 , and the steam separator 15 is used to separate moisture and impurities in the steam.

[0049] Flash steam often carries a certain amount of moisture and tiny particles of impurities. If the moisture and impurities directly enter the fan vacuum system 02, there is a possibility of reducing the fan efficiency, increasing the system resistance, and accelerating equipment wear. Therefore, in this embodiment, a steam separator 15 is added between the steam pipe 03 and the fan vacuum system 02. The steam separator 15 can separate moisture and impurities from the steam to ensure that the steam entering the fan vacuum system 02 is dry and clean.

[0050] It should be noted that the above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flash steam recovery and utilization system, characterized in that: include: Condensate tank, fan vacuum system and steam pipe; a steam outlet is provided on the top of the condensate tank, one end of the steam pipe is connected to the steam outlet, and the other end extends into the fan vacuum system and is connected to the air inlet in the fan vacuum system. The steam pipe is used to transport the flash steam generated in the condensate tank to the fan vacuum system; a regulating valve is provided on the steam pipe, and the regulating valve is used to control the opening and closing of the steam pipe.

2. The recycling system according to claim 1, characterized in that: The condensed water tank is provided with a drain pipe, a safety valve is provided in the drain pipe, and the drain pipe is used to discharge the flash steam in the condensed water tank into the air.

3. The recycling system according to claim 2, characterized in that: A muffler is provided at the end of the exhaust pipe, and the muffler is detachably connected to the exhaust pipe.

4. The recycling system according to any one of claims 1 to 3, characterized in that: The condensed water tank is provided with a pressure detector, and the pressure detector is used to detect the pressure in the condensed water tank.

5. The recycling system according to any one of claims 1 to 3, characterized in that: The recycling system also includes a condensate stabilization tank, a water outlet is provided at the bottom of the condensate tank, and the condensate stabilization tank and the water outlet are connected through a condensate pipe, so that the condensate in the condensate tank is discharged into the condensate stabilization tank along the condensate pipe.

6. The recycling system according to claim 5, characterized in that: The condensate water pipe is provided with a condensate water pump.

7. The recycling system according to any one of claims 1 to 3, characterized in that: The steam outlet is connected to the steam pipe via a flange structure, and a sealing gasket is provided in the flange structure.

8. The recycling system according to any one of claims 1 to 3, characterized in that: A heat-insulating layer is fixed on the outside of the steam pipe.

9. The recycling system according to any one of claims 1 to 3, characterized in that: A steam separator is provided between the steam pipe and the fan vacuum system, and the steam separator is used to separate moisture and impurities in the steam.

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