A method for recycling the discharged steam of a process

Abstract

The present invention discloses a method for recycling process discharged steam, a control pipeline and a steam collection assembly; the control pipeline is connected to the steam collection assembly, and the first air inlet is communicated with the control pipeline; this method for recycling process discharged steam includes the following steps: after steam is introduced into the process, the control pipeline controls the steam collection assembly to be communicated with the process discharge port; the waste steam containing air and water discharged from the process is introduced into the steam collection assembly, and the pressure controller controls the internal pressure of the energy storage device to be greater than the air pressure; after the process stops introducing steam, the control pipeline blocks the communication between the steam collection assembly and the process discharge port. Through the control of the control pipeline, when steam is introduced into the process, the process discharge port can be communicated with the steam collection assembly, which is beneficial to improving the purity of the steam collected by the steam collection assembly, and the steam collection assembly is beneficial to reducing the total steam discharge volume.

Description

Technical Field

[0001] The present invention relates to the technical field of steam recovery and utilization, and particularly relates to a method for recovering and utilizing the steam discharged from a process. Background Art

[0002] Due to the high heat enthalpy value of steam, the temperature of materials can be rapidly increased, making steam widely used as a heat energy medium in industrial production, drying and other fields. For example, in the steam heating process of foam products molding, a large amount of steam is required.

[0003] The steam heating process for foam products molding includes the following steps: mold closing, feeding, steam flushing, lateral steam, pressure holding, cooling, demolding, etc. The mechanism of foam product heating and forming is as follows: the equipment fills the mold cavity with foam plastic beads, and passes steam through the air holes on the mold cavity into the mold cavity, so that the foam plastic beads are softened and expanded after being heated. Under the limitation of the mold cavity, the expanded foam plastic beads can fill all the voids of the mold cavity. After cooling and shaping, the foam plastic product can be demolded.

[0004] In fact, during the process of heating steam to heat the foam plastic beads, the steam utilization rate is low, that is, only a small part of the steam heat is absorbed and utilized by the product and the mold, and most of the steam is directly discharged into the air as waste steam, which not only increases the heat in the atmosphere but also causes a large amount of energy waste. Since air is inevitably mixed in the mold cavity during mold closing, and condensate will be generated after the heating steam condenses, the waste steam discharged from the process will be mixed with air and condensate. The air and condensate contained in the waste steam are important factors affecting the recovery and reuse of steam. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] The present invention provides a method for recovering and utilizing the steam discharged from a process, including a control pipeline and a steam collection component; the control pipeline is connected to the steam collection component to control the on-off of the steam collection component and the process discharge port. The steam collection component includes an energy storage device and a pressure controller. The two sides of the energy storage device are respectively provided with a first air inlet and a first air outlet. The first air inlet is communicated with the control pipeline, and the pressure controller is used to control the internal pressure of the energy storage device.

[0007] The method for recovering and utilizing the steam discharged from the process includes the following steps:

[0008] After the steam is introduced into the process, the control pipeline controls the steam collection component to be communicated with the process discharge port;

[0009] The waste steam containing air and water discharged from the process is introduced into the steam collection assembly, and the pressure controller controls the internal pressure of the energy storage device to be greater than the air pressure;

[0010] After the process stops introducing steam, the control pipeline blocks the connection between the steam collection assembly and the process discharge port.

[0011] According to a method for recycling steam discharged from a process provided by an embodiment of the present invention, it has at least the following beneficial effects: Through the control of the control pipeline, during a certain period after the process introduces steam, the process discharge port is connected to the steam collection assembly, which is conducive to the collection of waste steam through the steam collection assembly. During a certain period after the process stops introducing steam, the control pipeline blocks the connection between the steam collection assembly and the process discharge port, which is conducive to avoiding the problem that the cooling water and air in the process enter the steam collection assembly and affect the steam recycling; After the process introduces steam, the control pipeline can connect the steam collection assembly and the process discharge port, and the waste steam containing air and water is discharged from the process discharge port and introduced into the steam collection assembly. Through the pressure controller, the internal pressure of the energy storage device can be made greater than the air pressure, that is, compared with directly discharging the waste steam into the air, the pressure difference between the process steam and the energy storage device is reduced, which is conducive to reducing the flow rate of the process steam discharged, improving the heat transfer efficiency between the heating steam and the foam plastic beads, and reducing the total amount of process steam discharged, playing a role in emission reduction. Moreover, the discharged waste steam can enter the steam collection assembly. In the energy storage device, since the densities of air and water are both greater than that of steam, air and water deposit at the lower end of the energy storage device, while steam flows to the upper end of the energy storage device, thereby separating and purifying the waste steam, facilitating the reuse of the purified steam in the process, and further realizing the recycling of steam.

[0012] According to some embodiments of the present invention, the control pipeline includes a first valve, a second valve, a first inlet, a first outlet, and a second outlet. Both the first outlet and the second outlet are connected to the first inlet. The first valve is used to control the on-off of the first outlet, and the second valve is used to control the on-off of the second outlet. The first inlet is connected to the process discharge port, and the second outlet is connected to the steam collection assembly;

[0013] In the step of controlling the connection between the steam collection assembly and the process discharge port by the control pipeline after the process introduces steam, it includes the following steps:

[0014] When the process initially introduces steam, the first valve is opened and the second valve is closed;

[0015] After a first time interval, the first valve is closed and the second valve is opened, and the process discharge port is connected to the steam collection assembly.

[0016] Since there is inevitably air mixed in the mold cavity when the mold is closed, when steam is initially introduced into the process, or during steam flushing, the steam will discharge the air in the mold cavity through the process discharge port. That is, at the initial stage of steam introduction, the air content at the process discharge port is relatively high and will gradually decrease. Therefore, for the method of recycling the steam discharged from this process, when steam is introduced at the initial stage of the process, the first valve is opened and the second valve is closed, that is, the connection between the process discharge port and the steam collection component is blocked. The air discharged from the process can be discharged to the atmosphere from the first outlet, which is beneficial to reducing the amount of air introduced into the steam collection component. After a first time interval, when the air in the mold cavity is largely discharged from the process, the first valve is closed and the second valve is opened, that is, the process discharge port is connected to the steam collection component, and relatively pure waste steam can be introduced into the steam collection component to achieve the preliminary collection and purification of steam. That is, the method of recycling the steam discharged from this process is beneficial to reducing the amount of air introduced into the steam collection component through the time-delay control of the pipeline, and is beneficial to improving the efficiency of steam collection and purification.

[0017] According to some embodiments of the present invention, in the step of controlling the pipeline to block the connection between the steam collection component and the process discharge port after the process stops introducing steam, the following steps are further included:

[0018] After the process stops introducing steam and the process stops discharging steam, the second valve is closed;

[0019] The steam collection component introduces the collected steam into the process.

[0020] When the expandable polystyrene beads in the mold cavity are foamed and formed, after the process stops introducing steam and the process discharge port stops discharging steam, in the method of recycling the steam discharged from this process, after the process stops discharging steam, the control pipeline can control the second valve to close, that is, block the connection between the steam collection component and the process discharge port. When the process needs to be cooled after foaming and forming, it is beneficial to avoid the problem that cooling water and air enter the steam collection component and cause the reduction of steam collection and purification efficiency. According to the process of each stage of the process, the control pipeline is beneficial to reducing the influence of air and liquid water on the collection and purification of steam through the on-off control of the process discharge port and the steam collection component, that is, improving the efficiency of steam recycling; the steam collection component can introduce the collected steam into this process or other processes, thereby improving the utilization rate of steam.

[0021] According to some embodiments of the present invention, the present invention further includes a drainer. The second outlet is located below the first inlet, the drainer is arranged between the second valve and the second outlet, and the upper end of the drainer is connected to the control pipeline;

[0022] The method of recycling the steam discharged from this process further includes the following steps:

[0023] The drain is opened, and the drain discharges the condensed water into the boiler.

[0024] The second outlet is located below the first inlet, and the upper end of the drain is connected to the control pipeline. The first inlet, the second outlet, and the drain are arranged in sequence from top to bottom. Under the guidance of gravity, the liquid water discharged from the process can flow to the drain. The drain can separate the liquid water contained in the waste steam from the gas, thereby reducing the amount of liquid water entering the steam collection assembly. During the stage when steam is introduced into the process, the heating steam will form condensed water when it encounters the mold with a lower temperature. The temperature of this condensed water is relatively high. Since the high-temperature water contains relatively high heat energy, the drain collects the high-temperature liquid water, and through the opening of the drain, the condensed water can be discharged into the boiler for reuse, which is beneficial to reducing the heat energy required for water heating, achieving the effect of energy conservation, and the purity of the condensed water is relatively high, and the recycling value is relatively high.

[0025] According to some embodiments of the present invention, the steam collection assembly further includes a liquid level detector. A third valve is provided at the lower end of the energy storage device, and the liquid level detector is used to detect the liquid level height of the energy storage device;

[0026] The method for recycling the steam discharged from the process further includes the following steps:

[0027] When the liquid level detector detects that the liquid level height in the energy storage device reaches the first set threshold, control the third valve to open to discharge the air and liquid water in the energy storage device;

[0028] When the liquid level detector detects that the liquid level height in the energy storage device drops to the second set threshold, then control the third valve to close.

[0029] A third valve is provided at the lower end of the energy storage device, and the steam collection assembly further includes a liquid level detector. When the liquid level detector detects that the liquid level height in the energy storage device reaches the first preset threshold, the third valve opens, and the air and liquid water in the energy storage device can be discharged from the energy storage device, which is beneficial to improving the purity of the steam in the energy storage device and is beneficial to realizing the collection and purification of the steam; when the liquid level detector detects that the liquid level height in the energy storage device drops to the second set threshold, then control the third valve to close, so as to maintain the pressure in the energy storage device, make the pressure in the energy storage device greater than the atmospheric pressure, which is beneficial to reducing the flow rate of the steam discharged from the process, thereby reducing the total amount of the steam discharged from the process, and playing a role in emission reduction.

[0030] According to some embodiments of the present invention, the present invention further includes a separator. The separator is connected to the third valve. A first air valve is connected to the upper end of the separator, and a first drain valve is connected to the lower end of the separator;

[0031] The method for recycling the steam discharged from the process further includes the following steps:

[0032] The first air valve opens to discharge the air in the separator, and the first drain valve opens to discharge the liquid water in the separator.

[0033] The separator is connected to the third valve. When the third valve opens, the air and liquid water in the energy storage device flow into the separator. The upper end of the separator is connected to the first air valve, and the lower end of the separator is connected to the first drain valve. When the air and liquid water in the separator reach a certain amount, the first air valve can be controlled to open, thereby discharging the air in the separator, and the first drain valve opens to discharge the liquid water in the separator, that is, the separation of air and liquid water is realized, which is beneficial to the reuse of the separated liquid water, that is, the condensate water generated in the waste steam collection process can be further collected, which is beneficial to the realization of resource reuse.

[0034] According to some embodiments of the present invention, multiple energy storage devices are provided, and the multiple energy storage devices are connected in sequence, and the multiple energy storage devices are all connected to the separator.

[0035] Under the control of the control pipeline, for the energy storage device, the input of the process steam is intermittent or variable flow. In order to reduce the impact of the change of steam input on steam recovery, multiple energy storage devices can be set, and the multiple energy storage devices are connected in sequence, that is, the first exhaust port of the energy storage device in the front is connected to the first intake port of the energy storage device in the back, so that the steam purified by the front energy storage device can flow into the back energy storage device for further purification, and the steam containing air can be purified through multiple energy storage devices, which is beneficial to improving the separation rate of air and steam, and the connection of multiple energy storage devices is beneficial to reducing the impact on the equipment caused by the intermittent transportation of the process steam.

[0036] According to some embodiments of the present invention, the pressure controller includes a second air valve and a pressure sensor. The pressure sensor is used to detect the pressure in the energy storage device, and the second air valve is connected to the energy storage device;

[0037] Before the step of introducing the waste steam containing air and water discharged from the process into the steam collection assembly, the following steps are further included:

[0038] The second air valve opens to introduce compensation gas into the energy storage device so that the pressure in the energy storage device is greater than the atmospheric pressure.

[0039] Considering that at the start of the process, the temperature in the energy storage device is normal temperature and the water vapor content is low; if no other gas enters, the pressure in the energy storage device will be the same as the atmospheric pressure, which is likely to cause the problem of unstable process parameters. Before the waste steam is introduced into the steam collection assembly, the steam recovery and utilization method of this process can introduce compensation gas into the energy storage device in advance, so that the pressure in the energy storage device is greater than the atmospheric pressure, so that the pressure in the energy storage device reaches the set range, so that the process parameters of the foam product molding steam heating process are more stable.

[0040] According to some embodiments of the present invention, the present invention further includes a purification device and a compressor. The inlet end of the purification device is communicated with the first exhaust port, and the outlet end of the purification device is communicated with the compressor;

[0041] The method for recycling the steam discharged from the process further includes the following steps:

[0042] The steam discharged from the steam collection assembly is introduced into the purification device to further purify the steam;

[0043] The compressor introduces the purified steam into the process.

[0044] The method for recycling the steam discharged from the process further includes a purification device and a compressor. The inlet end of the purification device is communicated with the first exhaust port. After the layering and preliminary purification by the steam collection assembly, the steam with relatively high purity can be introduced into the purification device, so as to further purify the steam. The outlet end of the purification device is communicated with the compressor. The compressor can reheat the purified steam and introduce the heated steam into the process again, so as to realize the recovery and reuse of the steam, which is conducive to the full utilization of the steam.

[0045] According to some embodiments of the present invention, the purification device includes an evaporation chamber, a condensation chamber and a suction device; the condensation chamber is connected to the evaporation chamber. The condensation chamber is provided with a second air inlet, a second exhaust port and a first drain port. The second air inlet is communicated with the first exhaust port. The evaporation chamber is provided with a first water inlet and a third exhaust port. The suction device is communicated with the third exhaust port; the first drain port can be communicated with the first water inlet;

[0046] The method for recycling the steam discharged from the process further includes the following steps;

[0047] The suction device evacuates the evaporation chamber to make the boiling point temperature of the water in the evaporation chamber lower than the sustainable condensation temperature of the condensation chamber.

[0048] The condensation chamber is connected to the evaporation chamber, and the second air inlet is communicated with the first exhaust port, that is, the steam preliminarily purified by the steam collection assembly is introduced into the condensation chamber, so that the steam condenses and releases heat, and the steam is liquefied into liquid water. Under the suction action of the suction device, the boiling point temperature of the water in the evaporation chamber is lower than the sustainable condensation temperature of the condensation chamber, so that the steam can be continuously condensed, and the heat released by the condensation is transferred to the evaporation chamber. Since the first drain port can be communicated with the first water inlet, the condensed water generated by the condensation of the steam is introduced into the evaporation chamber, so that the condensed water evaporates again, and the non-condensable gas in the condensation chamber is discharged from the second exhaust port, thus realizing the separation of the non-condensable gas. Through the operation of condensation and then evaporation again, it is beneficial to form pure steam. Under the compression of the compressor, the steam returns to the high-temperature saturated state again, so that the steam can meet the use requirements of the process steam again.

[0049] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0051] Figure 1 is a flowchart of a method for recycling process discharge steam provided by an embodiment of the present invention;

[0052] Figure 2 is a flowchart of a method for recycling process discharge steam provided by an embodiment of the present invention;

[0053] Figure 3 is a layout diagram of a method for recycling process discharge steam provided by an embodiment of the present invention;

[0054] Figure 4 is a layout diagram of a method for recycling process discharge steam provided by an embodiment of the present invention;

[0055] Figure 5 is a layout diagram of a method for recycling process discharge steam provided by an embodiment of the present invention;

[0056] Figure 6 is a layout diagram of a method for recycling process discharge steam provided by an embodiment of the present invention.

[0057] REFERENCE NUMERALS:

[0058] 110, first pipeline; 120, first valve; 130, second pipeline; 140, second valve; 200, energy storage device; 210, first air inlet; 220, first air outlet; 230, third valve; 240, second air valve; 300, drainer; 310, second drain valve; 400, separator; 410, first air valve; 420, first drain valve; 510, condensation chamber; 511, second air inlet; 512, second air outlet; 513, first drain port; 520, evaporation chamber; 521, first water inlet; 522, third air outlet; 530, compressor; 540, condensate collector; 600, process discharge port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or", "or / and", or "and / or" appear throughout the text, their meanings include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0062] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0063] Next, refer to Figures 1 to 6 To describe a method for recycling and utilization of process exhaust steam provided according to an embodiment of the present invention, selectively collect the waste steam discharged from the process, and purify the collected steam so that the steam can be reapplied to the process to achieve full utilization and reuse of resources.

[0064] It can be understood that referring to Figure 3 and Figure 4 , a method for recycling and utilization of process exhaust steam according to an embodiment of the present invention includes a steam collection component and a control pipeline. Among them, the inlet end of the control pipeline is communicated with the process discharge port 600.

[0065] Currently, in the foam product molding steam heating process, the condensate water, cooling water, waste steam, air, etc. generated by the process are all discharged centrally from a process discharge port 600. However, in different process stages of the foam product molding steam heating process, the air content in the gas discharged from the process discharge port 600 is different. For example, in the steam flushing stage of the foam product molding steam heating process, the air content in the gas discharged from the process discharge port 600 is relatively high and will rapidly decrease. For example, in the lateral steam stage of the foam product molding steam heating process, the air content in the gas discharged from the process discharge port 600 is relatively low while the purity of the steam is relatively high, and the temperature of the liquid water discharged from the process discharge port 600 is relatively high. For example, in the cooling and demolding stage of the foam product molding steam heating process, the air content in the gas discharged from the process discharge port 600 is relatively high and is mixed with cooling water.

[0066] See Figure 5 , the steam collection assembly is connected to the control pipeline, and the control pipeline can control the connection or blockage between the steam collection assembly and the process discharge port 600. According to the progress of each process stage, by controlling the on-off of the process discharge port 600 and the steam collection assembly, the control pipeline is beneficial to improving the purity of the steam collected by the steam collection assembly, and is beneficial to reducing the influence of air and liquid water on the collection and purification of steam, that is, improving the efficiency of steam recovery and utilization.

[0067] It can be understood that, see Figure 4 , the steam collection assembly includes a pressure controller and a storage tank 200. Among them, the storage tank 200 is provided with a first exhaust port 220 and a first intake port 210. The first exhaust port 220 and the first intake port 210 can be oppositely arranged on both sides of the storage tank 200, which is beneficial to increasing the time for the gas to flow through the storage tank 200. Specifically, both the first exhaust port 220 and the first intake port 210 are arranged at the upper end of the storage tank 200, which is beneficial to the gas to achieve layered deposition inside the storage tank 200. Among them, the control pipeline is connected to the first intake port 210, and the pressure controller is connected to the storage tank 200 to control the internal pressure of the storage tank 200 so that the internal pressure of the storage tank 200 is within the set threshold range.

[0068] It should be noted that the storage tank 200 is an instrument that can form a sealed structure, such as a tank body, a pipe body, a barrel body, etc. The specific shape of the storage tank 200 is not restricted here.

[0069] It can be understood that, see Figure 1 , in this embodiment, the method for recycling the steam discharged from this process includes the following steps:

[0070] S100: After the process is introduced with steam, the control pipeline controls the steam collection assembly to be connected to the process discharge port 600;

[0071] S200: The waste steam containing air and water discharged from the process is introduced into the steam collection assembly, and the pressure controller controls the internal pressure of the energy storage device 200 to be greater than the air pressure.

[0072] S300: After the process stops introducing steam, the control pipeline blocks the connection between the steam collection assembly and the process discharge port 600.

[0073] It can be understood that in step S100, compared with directly discharging the waste steam into the air, the method for recycling the steam discharged from the process improves the purity of the steam collected by the steam collection assembly by selecting the process stage. After the process introduces steam, the control pipeline connects the steam collection assembly and the process discharge port 600 at least for a certain period of time.

[0074] It can be understood that, referring to Figure 5 , in step S200, after the steam collection assembly is connected to the process discharge port 600, the waste steam containing liquid water and air is introduced into the steam collection assembly. The control pipeline can connect the steam collection assembly and the process discharge port 600, so that the waste steam containing liquid water and air is discharged from the process discharge port 600 and introduced into the steam collection assembly. By setting the pressure controller, the internal pressure of the energy storage device 200 can be made greater than the air pressure.

[0075] The pressure in the energy storage device 200 is generally higher than the atmospheric pressure. In the traditional process, the pressure difference between the process steam and the atmosphere is large, resulting in a large amount of steam being discharged into the atmosphere. However, the method for recycling the steam discharged from the process provided by the embodiment of the present invention can make the pressure difference between the energy storage device 200 and the process steam smaller than the pressure difference between the atmosphere and the process steam through the connection between the energy storage device 200 and the pressure controller.

[0076] According to the pipeline flow formula Q=(H / sL)^1 / 2, where H is the head difference between the starting end and the ending end of the pipeline, in m, L is the length from the starting end to the ending end of the pipeline, and s is the pipeline specific resistance. When factors such as the length L of the pipeline and the damping ratio s of the pipeline remain unchanged, the setting of the energy storage device 200 reduces the head difference H between the starting end and the ending end of the pipeline, which is beneficial to reducing the flow velocity of the process steam discharged, and further reducing the total amount of the process steam discharged, achieving the effect of reducing the amount of steam discharged. Moreover, the steam containing air discharged from the process can still be introduced into the energy storage device 200 for purification treatment, which is beneficial to further realizing the recycling of the steam, conforms to the concept of energy conservation and emission reduction, and has high economic value.

[0077] Moreover, the reduction of the steam flow rate in the mold is beneficial to the heat exchange between the steam and the expandable polystyrene beads. In the mold cavity, there is not only heat exchange but also mass transfer effect between the steam and the expandable polystyrene beads. There are many bubbles inside the expandable polystyrene beads, and the water vapor concentration outside the expandable polystyrene beads is higher than that inside the bubbles of the expandable polystyrene beads. The water vapor diffuses through the wall of the expandable polystyrene beads into the bubbles inside the expandable polystyrene beads. When the steam velocity is high, the kinetic energy of the steam molecules is high. After the steam collides with the liquid film or interface, it is bounced off, resulting in a reduction in the heat transfer and mass transfer effects between the steam molecules and the expandable polystyrene beads. Therefore, the setting of the energy storage device 200 in the steam collection assembly is beneficial to reducing the steam flow rate in the mold, improving the heat transfer efficiency of the steam to the mold cavity wall and the expandable polystyrene beads, thereby reducing the time of single-sided steam in the process, and the reduction of the single-sided steam time can also play a role in reducing the steam consumption.

[0078] The mold cavity includes an inlet steam side mold cavity and an outlet steam side mold cavity. When there is horizontal steam, under the pressure boosting effect of the steam collection assembly, the internal steam pressure in the outlet steam side mold cavity is greater than the steam pressure of the traditional direct discharge. When the heating steam penetrates into the interior of the outlet steam side mold cavity, it is beneficial to avoid the problem of the sudden pressure relief of the steam inside the mold cavity and the uneven temperature inside the mold cavity, which may lead to the lack of material in the molded product. Moreover, the increase in the steam pressure in the outlet steam side mold cavity is beneficial to heating this part of the mold cavity.

[0079] It can be understood that in step S200, the steam containing air discharged from the process can be introduced into the energy storage device 200 through the control pipeline at the first air inlet 210. When the steam containing air enters the energy storage device 200, in the large-volume space, the flow rate of the gas decreases, and the gas can carry out relatively sufficient energy exchange and deposition in the space, that is, it is considered that the pressure and temperature in the energy storage device 200 are basically stable.

[0080] According to Avogadro's law of gases, at the same temperature and pressure, any gas with the same volume contains the same number of molecules. The average relative molecular mass of air is greater than that of steam, that is, the density of air is greater than that of steam, so that the air moves to the lower end of the energy storage device 200 while the steam moves to the upper end of the energy storage device 200. The condensed liquid water of the steam also flows to the lower part of the energy storage device 200. That is, by using the physical properties of steam and air, the two can be stratified, which can play a role in purifying the steam to a certain extent.

[0081] It can be understood that in step S300, when the steam supply in the process stops, the air content of the gas discharged from the process outlet 600 gradually increases. And as the process proceeds to the cooling and demolding stage, the relatively low-temperature cooling water will be discharged at the process outlet 600. If the cooling water is introduced into the steam collection assembly, due to the heat transfer between the relatively low-temperature cooling water and the relatively high-temperature steam, the temperature of the steam will be reduced, increasing the difficulty of reusing the steam in the process.

[0082] Therefore, in a certain period after the process stops introducing steam, the method for recycling the discharged steam of the process blocks the connection between the process discharge port 600 and the steam collection component by controlling the pipeline, which is beneficial to avoiding the entry of relatively cold cooling water into the steam collection component and affecting the collection and purification of steam.

[0083] It can be understood that the control pipeline includes a first inlet, a first valve 120, a first outlet, a second outlet, and a second valve 140. The first valve 120 is used to control the on-off of the first outlet and the first inlet, and the second valve 140 is used to control the on-off of the second outlet and the first inlet. That is, through the control of the first valve 120 and the second valve 140, the on-off control of the first outlet and the first inlet, and the second outlet and the first inlet can be realized. The steam collection component is connected to the second outlet, the process discharge port 600 is connected to the first inlet, and the first outlet is connected to the atmosphere.

[0084] It can be understood that, referring to Figure 3 and Figure 4 Specifically, the control pipeline includes a first pipeline 110 and a second pipeline 130. Among them, the first inlet and the first outlet are respectively the inlet end and the outlet end of the first pipeline 110. The process discharge port 600 is connected to the inlet end of the first pipeline 110, that is, the first inlet is connected to the process discharge port 600, and the materials discharged from the process discharge port 600 first enter the first pipeline 110.

[0085] The first pipeline 110 is connected to the first valve 120. The setting of the first valve 120 can be used to control the on-off of the outlet end of the first pipeline 110. The inlet end of the second pipeline 130 is connected to the first pipeline 110. The inlet end of the second pipeline 130 is arranged between the first valve 120 and the inlet end of the first pipeline 110. The second outlet is the outlet end of the second pipeline 130. The second valve 140 is connected to the second pipeline 130 to control the on-off of the inlet end of the second pipeline 130. The first air inlet 210 is connected to the outlet end of the second pipeline 130.

[0086] Referring to Figure 2 In step S100, in the step of controlling the connection between the steam collection component and the process discharge port 600 after the process introduces steam, the following steps are included:

[0087] S110: When steam is introduced at the initial stage of the process, the first valve 120 is opened and the second valve 140 is closed;

[0088] S120: After a first time interval, the first valve 120 is closed and the second valve 140 is opened, and the process discharge port 600 is connected to the steam collection component.

[0089] It can be understood that in step S110, a steam inlet valve is provided at the upper end of a conventional mold, and heating steam is introduced into the mold through the steam inlet valve. A discharge valve is provided at the lower end of the mold, and the discharge valve is used to control the on-off of the process discharge port 600.

[0090] In the initial stage of the foam product molding steam heating process, saturated steam needs to be introduced in the steam flushing step. Therefore, both the steam inlet valve and the discharge valve are opened, and saturated steam is introduced into the mold. The pressure of the saturated steam is greater than the atmospheric pressure. Since the saturated steam pressure and temperature are in a positive correlation correspondence relationship, when the steam pressure increases, the steam temperature also increases. When the saturated steam pressure is greater than 1 atmospheric pressure, the saturated steam temperature is greater than 100 °C. At this time, the mold has just been filled with materials, and the air temperature inside the mold is approximately equal to the normal temperature. After the steam enters the mold from the steam pipeline, according to Bernoulli's equation: P + 1 / 2ρv 2 + ρgh = c, the sum of kinetic energy, gravitational potential energy, and pressure potential energy is a constant. Since the weight potential energy of the gas is negligible, when the steam enters the mold from the steam pipeline, the steam volume expands rapidly, the steam flow rate decreases, and the steam pressure increases, that is, the kinetic energy of the saturated steam is converted into pressure potential energy. It can be considered that the pressure on one side of the mold is instantaneously balanced, that is, the pressure of the air inside the mold is the same as the pressure of the saturated steam.

[0091] According to Avogadro's law of gases, at the same temperature and pressure, any gas in the same volume contains the same number of molecules, and the ideal gas equation: PV = nRT. At this time, the heat exchange between the steam and the air is not in time to reach equilibrium. The steam temperature is high and the air temperature is low. The number of steam molecules is less than the number of air molecules, and the relative molecular mass of the steam is 18, while the average relative molecular mass of the air molecular weight is about 29. It can be seen that the density of the saturated steam is much smaller than the density of the air. The saturated steam floats to the top of the mold, and the process discharge port 600 is provided at the lower end of the mold. Therefore, the air inside the mold is discharged from the inside of the mold before the steam. The liquid water mixed with air inside the mold is discharged from the process discharge port 600. That is, in the initial stage of the process, the air content of the process exhaust gas is relatively high and will decrease rapidly.

[0092] To improve the purity of the collected steam, in the initial stage of introducing steam in the process, the method for recycling the steam discharged in this process controls the pipeline to close the second valve 140 and open the first valve 120 to discharge the air in the process exhaust gas along the first pipeline 110 from the process system, thereby reducing the amount of air entering the steam collection component.

[0093] It can be understood that in step S120, after the first time interval, the second valve 140 is opened and the first valve 120 is closed, that is, the first pipeline 110 is closed and the second pipeline 130 is connected, so that the second pipeline 130 forms a loop with the process discharge port 600, and the process discharge port 600 is connected to the steam collection component.

[0094] After the first time interval, when the steam exhaust discharges the air in the mold cavity from the process system to a great extent, the purity of the steam discharged at the process outlet 600 is improved. The control pipeline then connects the second pipeline 130 and the loop of the process outlet 600, which is conducive to allowing relatively pure waste steam to flow into the steam collection component to achieve the collection and preliminary purification of the steam. That is, the method for recycling the steam discharged from this process, through the delay control of the control pipeline, is conducive to reducing the amount of air flowing into the steam collection component and improving the efficiency of steam collection and purification.

[0095] It can be understood that the first time interval is greater than 0S and less than 2S. The closing time of the first valve 120 can be set within 2 seconds after the initial steam enters the mold. That is, the first valve 120 is closed with a delay relative to the initial time when the steam is introduced. The second valve 140 is opened with a delay relative to the initial time when the steam is introduced to improve the purity of the waste steam recovered by the steam collection component.

[0096] It can be understood that when the second valve 140 is opened with a delay, the steam collection component is connected to the process outlet 600. According to the comparison between the pressure of the energy accumulator 200 and the pressure in the mold, it includes the following two situations:

[0097] First, if the pressure in the mold is greater than the pressure of the energy accumulator 200, under the action of the pressure difference, during the steam scouring stage, the waste steam generated in the mold flows into the energy accumulator 200. Under the control of the pressure controller, the pressure in the energy accumulator 200 is greater than the air pressure. Compared with the traditional direct discharge method, it is conducive to reducing the pressure difference between the energy accumulator 200 and the process steam, thereby reducing the flow rate of the steam discharged from the process, improving the heat transfer efficiency between the heating steam and the expanded polystyrene beads, being conducive to reducing the total amount of the steam discharged from the process, and the waste steam flowing into the energy accumulator 200 can be stratified and deposited in the energy accumulator 200, thereby realizing the separation of air and condensed water in the waste steam, and thus realizing the recycling of the steam.

[0098] Second, if the pressure in the mold is less than the pressure in the energy storage device 200, since the steam inlet valve in the mold is generally a proportional valve, the pressure in the mold can be adjusted within a certain range. Therefore, it is possible that the pressure in the mold is less than the pressure in the energy storage device 200; or, when the size of the product produced by the process is small, there is also a situation where the pressure in the mold is less than the pressure in the energy storage device 200. At this time, under the action of the pressure difference, during the steam scouring stage, the steam in the energy storage device 200 can be reversely introduced into the mold. Since the first air inlet 210 is located above the energy storage device 200, the steam above the energy storage device 200 can be reversely introduced into the mold through the first air inlet 210, so that the pressure in the mold can quickly reach the set value and be stabilized, that is, the stability of the production process parameters is improved. By reusing the steam in the energy storage device 200, it is beneficial to save energy.

[0099] It can be understood that with the continuous introduction of process steam, during the steam scouring and horizontal steam stages, the pressure in the mold will gradually be higher than the pressure in the energy storage device 200. Under the action of the pressure difference, the waste steam generated in the mold will gradually be introduced into the energy storage device 200 for purification treatment. By reducing the pressure difference between the energy storage device 200 and the process steam, the flow rate of the process exhaust steam is reduced, the heat transfer efficiency between the heating steam and the expanded polystyrene beads is improved, which is beneficial to reducing the total amount of the process exhaust steam, and the waste steam introduced into the energy storage device 200 can be stratified and deposited in the energy storage device 200, that is, the separation of air and condensed water in the waste steam is realized, so as to realize the recycling and reuse of the steam.

[0100] It can be understood that when the process runs to the pressure holding stage of the double-sided steam, the discharge valve is closed. By closing the discharge valve, the connection between the mold and the steam collection component can be blocked, so that the mold forms a closed space. With the continuous introduction of the heating steam, the steam pressure in the mold reaches the peak value, meeting the use requirements for heating the expanded polystyrene beads. At this time, the pressure in the mold is higher than the pressure in the energy storage device 200. When the discharge valve is opened, that is, after the mold is depressurized, the waste steam in the mold can be introduced into the steam collection component again, so as to realize the collection and purification of the waste steam, facilitating the full utilization and recycling of the steam.

[0101] It can be understood that the method for recycling the process exhaust steam also includes a controller. Both the second valve 140 and the first valve 120 are signal-connected to the controller. For example, the second valve 140 and the first valve 120 can be connected to the controller through electrical signals, pneumatic signals, pulse signals, etc. The controller can simultaneously control the connection or closing of the second valve 140 and the first valve 120, which is beneficial to reducing the labor intensity of workers and improving the control accuracy of the process. The controller can be connected to the steam inlet valve at the upper end of the mold, so as to realize the linkage between the steam inlet valve and the second valve 140 and the first valve 120.

[0102] It can be understood that, referring to Figure 2 , in step S300, after the process stops introducing steam, in the step of controlling the pipeline to block the connection between the steam collection component and the process discharge port 600, the following steps are further included:

[0103] S310: After the process stops introducing steam and stops discharging steam, the second valve 140 closes;

[0104] S320: The steam collection component introduces the collected steam into the process.

[0105] After the expandable polystyrene beads in the mold cavity are foamed and formed, the mold is depressurized, the process gradually stops introducing steam, and the process discharge port gradually stops discharging steam. Then the process enters the cooling and demolding stage, and cooling water is introduced into the process to cool down and cool the mold so as to realize the demolding of the foam product. The steam content at the process discharge port 600 rapidly decreases. After the process stops introducing steam and stops discharging steam, that is, after the waste steam in the mold is collected, the control pipeline can control the second valve 140 to close and the first valve 120 to open, that is, block the connection between the process discharge port 600 and the steam collection component. After the process stops introducing steam, it is beneficial to avoid the problem that cooling water and air enter the steam collection component and cause the reduction of steam collection and purification efficiency. According to the process of each stage of the process, the control pipeline controls the connection and disconnection between the process discharge port 600 and the steam collection component, which is beneficial to reducing the influence of air and liquid water on the collection and purification of steam, that is, improving the efficiency of steam recovery and utilization.

[0106] It can be understood that, referring to Figure 3 and Figure 5 , considering that in the foam product molding steam heating process, condensed water will continuously be generated after the steam releases heat. In order to further reduce the amount of condensed water entering the steam collection component, the method for recycling the steam discharged from the process further includes a drain 300. The second pipeline 130 is connected to the upper end of the drain 300. The drain 300 is arranged between the second valve 140 and the outlet end of the second pipeline 130, that is, the liquid water contained in the waste steam needs to pass through the drain 300 before entering the steam collection component.

[0107] The drain 300 can be a water storage tank. The upper end of the water storage tank is communicated with the second pipeline 130, that is, the second pipeline 130 is located below the first pipeline 110. A second drain valve 310 is provided at the lower end of the water storage tank. That is, the first pipeline 110, the second pipeline 130 and the water storage tank are arranged in sequence from top to bottom. Under the action of gravity, the liquid water and air contained in the waste steam can flow along the first pipeline 110 and the second pipeline 130 into the water storage tank, and the liquid water is collected in the water storage tank, which is beneficial to realizing the purification treatment of the waste steam. The liquid water in the water storage tank can increase the melting amount of the air contained in the waste steam. To a certain extent, it can play a role in reducing the air entering the steam collection assembly. The setting of the second drain valve 310 can discharge the liquid water in the drain 300. In some other embodiments of the present invention, the drain 300 can be a valve body such as a water trap valve.

[0108] During the stage of introducing steam into the process, the heating steam will form condensed water when it encounters the relatively low-temperature mold. The temperature of this condensed water is relatively high. The high-temperature condensed water generated in the mold can be collected into the drain 300.

[0109] It can be understood that the method for recycling the discharged steam of this process further includes the following steps:

[0110] S400: The drain 300 is opened, and the drain 300 passes the condensed water into the boiler.

[0111] During the stage of introducing steam into the process, the heating steam will form condensed water when it encounters the relatively low-temperature mold. The temperature of this condensed water is relatively high. Since the high-temperature water contains relatively high heat energy, the drain 300 collects the high-temperature liquid water, and by opening the second drain valve 310, the collected condensed water can be passed into the boiler to regenerate the heating steam, which is beneficial to reducing the heat energy required for water heating, and can also achieve the effect of energy saving. Moreover, the purity of the condensed water is relatively high, and the recycling value is relatively high.

[0112] It should be understood that in some other embodiments, the mold includes a moving mold and a fixed mold. The moving mold can be combined with the fixed mold to form a mold cavity. A first process outlet is provided at the lower end of the moving mold, and a second process outlet is provided at the lower end of the fixed mold. The control pipeline includes mutually independent first and second pipelines. The first pipeline is provided with a first inlet end, a second inlet end and a first outlet end. The first inlet end is communicated with the first process outlet, the second inlet end is communicated with the second process outlet, and a first valve and a second valve are respectively provided at the first inlet end and the second inlet end. Through the control of the first valve and the second valve, the on-off control of the first inlet end and the first outlet end and the second inlet end and the first outlet end can be realized.

[0113] The second pipeline is provided with a third inlet end, a fourth inlet end and a second outlet end. The third inlet end is communicated with the first process outlet, and the fourth inlet end is communicated with the second process outlet. A third valve and a fourth valve are respectively arranged at the third inlet end and the fourth inlet end. Through the control of the third valve and the fourth valve, the on-off control between the third inlet end and the second outlet end and between the fourth inlet end and the second outlet end can be realized. The first valve and the third valve are both communicated with the first process outlet, and the second valve and the fourth valve are both communicated with the second process outlet.

[0114] In the method for recycling the discharged steam of the process, after the steam is introduced into the process, in the step of controlling the pipeline to control the steam collection assembly to be communicated with the process discharge port 600, the following steps are included:

[0115] After the steam is introduced at the initial stage of the process, the first valve and the second valve are opened and the third valve and the fourth valve are closed.

[0116] After the first time interval, the first valve and the second valve are closed and the third valve and the fourth valve are opened, and the process discharge port 600 is communicated with the steam collection assembly.

[0117] The method for recycling the discharged steam of the process can realize the on-off control between the process discharge port 600 and the steam collection assembly through the control of the first valve, the second valve, the third valve and the fourth valve, and further can control the steam collection assembly to selectively collect the steam at different stages of the process.

[0118] It should be understood that in some other embodiments, the control pipeline can be a two-way three-way valve. The control pipeline includes a first inlet, a first outlet and a second outlet. When the valve core is in the first position, the first outlet is communicated with the first inlet and the second outlet is blocked from the first inlet. When the valve core is in the second position, the first outlet is blocked from the first inlet and the second outlet is communicated with the first inlet. By switching the valve core between the first position and the second position, the communication between the steam collection assembly and the process discharge port 600 can be controlled, and further the steam collection assembly can be controlled to selectively collect the steam at different stages of the process.

[0119] It can be understood that in this embodiment, the method for recycling the discharged steam of the process further includes a liquid level detector and a third valve 230. Among them, the third valve 230 is arranged at the lower end of the energy storage device 200, and the liquid level detector is communicated with the energy storage device 200 to be used for detecting the liquid level height of the energy storage device 200.

[0120] The method for recycling the discharged steam of the process further includes the following steps:

[0121] S510: When the liquid level detector detects that the liquid level height in the energy storage device 200 reaches the first set threshold, control the third valve 230 to open to discharge the air and liquid water in the energy storage device 200.

[0122] S520: When the liquid level detector detects that the liquid level height in the energy storage device 200 drops to the second set threshold value, control the third valve 230 to close.

[0123] The liquid level detector can adopt a sensor that is triggered by contacting or indirectly contacting liquid water. The liquid level detector and the third valve 230 can both be signal-connected to the controller. For example, the third valve 230 and the liquid level detector can be connected to the controller through electrical signals, pneumatic signals, pulse signals, etc.

[0124] When the liquid level detector detects that the liquid level height in the energy storage device 200 reaches the first preset threshold value, the liquid level detector generates a first detection signal and sends the first detection signal to the controller. The controller receives the first detection signal, and the first detection signal controls the third valve 230 to open, and the liquid water and air in the energy storage device 200 can be discharged from the energy storage device 200, which is beneficial to improving the steam purity in the energy storage device 200 and is beneficial to realizing the collection and purification of steam.

[0125] When the liquid level detector detects that the liquid level height in the energy storage device 200 reaches the second preset threshold value, the liquid level detector generates a second detection signal and sends the second detection signal to the controller. The controller receives the second detection signal, and the second detection signal controls the third valve 230 to close, so as to maintain the pressure in the energy storage device 200, make the pressure in the energy storage device 200 greater than the atmospheric pressure, which is beneficial to reducing the flow rate of the process-discharged steam, thereby reducing the total amount of the process-discharged steam and playing a role in emission reduction.

[0126] It can be understood that, referring to Figure 3 and Figure 5 , the method for recycling the process-discharged steam further includes a separator 400. The separator 400 is arranged below the energy storage device 200. The third valve 230 is communicated with the separation inlet of the separator 400. The separation inlet can be arranged in the middle of the separator 400. A first drain valve 420 and a first air valve 410 are arranged on the separator 400. Among them, the first air valve 410 is arranged at the upper end of the separator 400, and the first drain valve 420 is arranged at the lower end of the separator 400.

[0127] The method for recycling the process-discharged steam further includes the following steps:

[0128] S600: Open the first air valve 410 to discharge the air in the separator 400, and open the first drain valve 420 to discharge the liquid water in the separator 400.

[0129] The air deposited at the lower end of the energy storage device 200 and the liquid water condensed from part of the steam are discharged from the energy storage device 200 at the third valve 230, then enter the separator 400, and gas-liquid separation is achieved in the separator 400. The first air valve 410 is arranged at the upper end of the separator 400, and the first drain valve 420 is arranged at the lower end of the separator 400. Inside the separator 400, the air moves towards the upper end of the separator 400 while the liquid water deposits towards the lower end of the separator 400 to achieve the collection of air and liquid water. Both the first drain valve 420 and the first air valve 410 communicate with the internal chamber of the separator 400. By controlling the opening and closing of the first drain valve 420 and the first air valve 410, the liquid water and gas can be discharged from the separator 400, which is beneficial for the reuse of the separated liquid water, that is, for the further collection of the condensed water generated during the waste steam collection process, and is beneficial for the realization of resource reuse. The separator 400 can be in the form of a tank body.

[0130] It can be understood that under the control of the control pipeline, for the energy storage device 200, the input of the process steam is intermittent or variable flow rate, in order to reduce the impact of the change in steam input on steam recovery.

[0131] The energy storage device 200 of the method for recycling the discharged steam of the process wafer is provided with multiple ones, and the upper ends of the multiple energy storage devices 200 are connected in sequence, that is, the first exhaust port 220 of the energy storage device 200 located in the front communicates with the first intake port 210 of the energy storage device 200 located in the rear, and the first intake port 210 of the energy storage device 200 located at the front end communicates with the outlet end of the second pipeline 130, so that the steam purified by the previous energy storage device 200 can be introduced into the next energy storage device 200 for further purification. The lower ends of the multiple energy storage devices 200 are all connected to the separator 400, that is, the steam containing air can be purified by the multiple energy storage devices 200, which is beneficial for improving the separation rate of air and steam, and the connection of the multiple energy storage devices 200 is beneficial for reducing the impact on the equipment caused by the intermittent delivery of the process steam.

[0132] It can be understood that considering that at the start of the process, the temperature inside the energy storage device 200 is normal temperature and the water vapor content is low; if no other gas enters, the pressure inside the energy storage device 200 will be the same as the atmospheric pressure, and the process parameters are unstable.

[0133] The pressure controller includes a pressure sensor and a second air valve 240. The pressure sensor is connected to the energy storage device 200 to be used for detecting the pressure inside the energy storage device 200, and one end of the second air valve 240 is connected to the energy storage device 200.

[0134] Before step S200, the following steps are further included:

[0135] S700: The second air valve 240 is opened, and compensating gas is introduced into the energy storage device 200 so that the pressure in the energy storage device 200 is greater than the atmospheric pressure.

[0136] In the initial stage of the process, the second air valve 240 can be opened, and compensating gas is introduced into the energy storage device 200 to make the pressure in the energy storage device 200 reach the set range, so as to stabilize the foaming process parameters. The compensating gas can be compressed air, water vapor, etc. As can be seen from the above analysis, the density of saturated steam is less than that of air under the same pressure. If the compensating gas is water vapor, the second air valve 240 can be arranged at the upper end of the energy storage device 200. If the compensating gas is compressed air, the second air valve 240 can be arranged at the lower end of the energy storage device 200, so that the gas in the energy storage device 200 is more stable.

[0137] It can be understood that referring to Figure 3 and Figure 6 , the method for recycling the discharged steam of this process further includes a compressor 530 and a purification device. The purification device is arranged between the compressor 530 and the steam collection assembly. The first exhaust port 220 is communicated with the inlet end of the purification device, and the compressor 530 is communicated with the outlet end of the purification device.

[0138] The method for recycling the discharged steam of this process further includes the following steps:

[0139] S810: The steam discharged from the steam collection assembly is introduced into the purification device to further purify the steam;

[0140] S820: The compressor 530 introduces the purified steam into the process.

[0141] The method for recycling the discharged steam of this process further includes a compressor 530 and a purification device, and the first exhaust port 220 is communicated with the inlet end of the purification device. After the stratification and preliminary purification of the steam collection assembly, the steam with relatively high purity can be introduced into the purification device, so as to further purify the steam. The compressor 530 is communicated with the outlet end of the purification device. The compressor 530 can compress and heat up the purified steam again, and introduce the high-temperature saturated steam into the process again, so as to realize the recovery and reuse of the steam, which is beneficial to the full utilization of the steam.

[0142] It can be understood that referring to Figure 3 and Figure 6 , the purification device includes a condensate collector 540, an evaporation chamber 520, a suction device and a condensation chamber 510; the evaporation chamber 520 is connected to the condensation chamber 510, so that the heat released by the condensation chamber 510 can be transferred into the evaporation chamber 520 and absorbed by the material to be heated, thereby reducing the energy consumption of the liquid water evaporation process. Specifically, the condensation chamber 510 can share the same wall surface with the evaporation chamber 520 to meet the heat transfer requirements of both.

[0143] The condensation chamber 510 is provided with a first drain port 513, a second exhaust port 512 and a second intake port 511. The first exhaust port 220 is in communication with the second intake port 511. The evaporation chamber 520 is provided with a third exhaust port 522 and a first water inlet 521. The third exhaust port 522 is in communication with a suction device; both the first drain port 513 and the first water inlet 521 can be in communication with a condensate collector 540, and the condensate collector 540 can control the on-off of the first drain port 513 and the first water inlet 521.

[0144] It can be understood that the method for recycling the process discharge steam further includes the following steps:

[0145] S900: The suction device evacuates the evaporation chamber 520 to make the boiling point temperature of the water in the evaporation chamber 520 lower than the sustainable condensation temperature of the condensation chamber 510.

[0146] The evaporation chamber 520 is connected to the condensation chamber 510, and the first exhaust port 220 is in communication with the second intake port 511, that is, the steam preliminarily purified by the steam collection assembly is introduced into the condensation chamber 510, so that the steam is cooled and releases heat, and the steam is liquefied into liquid water.

[0147] Moreover, under the suction action of the suction device, the boiling point temperature of the water in the evaporation chamber 520 is lower than the sustainable condensation temperature of the condensation chamber 510, so that the steam can be continuously condensed, and the heat released by the condensation is transferred to the evaporation chamber 520. Since the first drain port 513 can be in communication with the first water inlet 521, the condensate generated by the condensation of the steam is introduced into the evaporation chamber 520, so that the condensate is re-evaporated, and the non-condensable gas in the condensation chamber 510 is discharged from the second exhaust port 512, thereby realizing the separation of the non-condensable gas. Through the operation of re-evaporation after condensation, it is beneficial to form pure steam. Under the compression action of the compressor 530, the steam returns to the high temperature and saturated state again, so that the steam can meet the use requirements of the process steam again.

[0148] Analyzing the evaporation and condensation process of water, when the temperature of liquid water reaches the boiling point, the liquid water evaporates. If no heat is input, the temperature of the liquid water decreases and the evaporation stops. If heat is input, the evaporation of the liquid water continues; when the temperature of saturated water vapor decreases, the saturated water vapor releases heat and the water vapor condenses into liquid water. If the heat cannot be transferred at this time, the temperature of the water vapor will rise and the condensation of the water vapor will stop. If the heat is transferred, the water vapor will continue to condense and the saturated vapor pressure of the water will decrease until a new temperature equilibrium point is reached. The whole process must follow the First Law of Thermodynamics and the Second Law of Thermodynamics.

[0149] From the above analysis, in order for the saturated water vapor in the condensation chamber 510 to condense, cold energy must be continuously provided. In order for the liquid water in the evaporation chamber 520 to maintain boiling evaporation, continuous heat supply is required. If the two states are to be transformed into each other, the temperature and pressure of the saturated water vapor need to be increased.

[0150] According to the ideal gas state equation PV = nRT, the density is expressed as PM = ρRT, where M is the molar mass of the gas and R is the gas constant. It can also be understood that when the pressure increases, the volume decreases. The suction device does work on the gas in the evaporation chamber 520, reducing the boiling point temperature of the water in the evaporation chamber 520. A temperature difference is formed between the boiling point temperature of the water in the evaporation chamber 520 and the sustainable condensation temperature in the condensation chamber 510, so that heat can be transferred between the evaporation chamber 520 and the condensation chamber 510 to maintain balance and enable continuous heat transfer.

[0151] The first exhaust port 220 is connected to the second intake port 511, that is, the steam passing through the energy storage device 200 is introduced into the condensation chamber 510, and the steam condenses and releases heat in the condensation chamber 510. The evaporation chamber 520 is provided with a third exhaust port 522 and a first water inlet 521. The third exhaust port 522 is connected to the suction device. The setting of the suction device can reduce the boiling point temperature of the water in the evaporation chamber 520, making the boiling point temperature of the water in the evaporation chamber 520 lower than the sustainable condensation temperature of the condensation chamber 510, and the condensation chamber 510 is in contact with the evaporation chamber 520, so that the steam in the condensation chamber 510 can continuously condense and transfer the released heat to the evaporation chamber 520 to realize the evaporation of the liquid, thus effectively utilizing the heat contained in the steam. The non-condensable gas contained in the steam is discharged from the second exhaust port 512.

[0152] It should be noted that the suction device can be various pumps, fans, etc. Through the suction of the suction device, it is beneficial to reduce the pressure in the evaporation chamber 520, and then play a role in reducing the boiling point temperature of the water in the evaporation chamber 520.

[0153] It should be understood that in some other embodiments, the condensation chamber 510 and the evaporation chamber 520 are independent of each other and are in contact with each other to meet the use requirements of heat transfer between the two.

[0154] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

[0155] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for recycling process exhaust steam, characterized in that , The process is a foam product molding steam heating process, including: a control pipeline and a steam collection assembly; the control pipeline is connected to the steam collection assembly to control the on-off of the steam collection assembly and the process discharge port. The steam collection assembly includes an energy storage device and a pressure controller. The two sides of the energy storage device are respectively provided with a first air inlet and a first exhaust port. The first air inlet is communicated with the control pipeline, and the pressure controller is used to control the internal pressure of the energy storage device; The method for recycling the steam discharged from this process includes the following steps: After the process introduces steam, the control pipeline controls the steam collection assembly to be communicated with the process discharge port; The waste steam containing air and water discharged from the process is introduced into the steam collection assembly, and the pressure controller controls the internal pressure of the energy storage device to be greater than the air pressure; After the process stops introducing steam, the control pipeline blocks the communication between the steam collection assembly and the process discharge port; The control pipeline includes a first valve, a second valve, a first inlet, a first outlet, and a second outlet. The first outlet and the second outlet are both communicated with the first inlet. The first valve is used to control the on-off of the first outlet, and the second valve is used to control the on-off of the second outlet. The first inlet is communicated with the process discharge port, and the second outlet is communicated with the steam collection assembly; In the step of the control pipeline controlling the steam collection assembly to be communicated with the process discharge port after the process introduces steam, it includes the following steps: When steam is introduced at the initial stage of the process, the first valve is opened and the second valve is closed; After a first time interval, the first valve is closed and the second valve is opened, and the process discharge port is communicated with the steam collection assembly; The pressure controller includes a second air valve and a pressure sensor. The pressure sensor is used to detect the pressure in the energy storage device, and the second air valve is communicated with the energy storage device; Before the step of introducing the waste steam containing air and water discharged from the process into the steam collection assembly, the following steps are further included: The second air valve is opened, and compensation gas is introduced into the energy storage device to make the pressure in the energy storage device greater than the atmospheric pressure; It further includes a purification device and a compressor. The inlet end of the purification device is communicated with the first exhaust port, and the outlet end of the purification device is communicated with the compressor; The method for recycling the steam discharged from this process further includes the following steps: The steam discharged from the steam collection assembly is introduced into the purification device to further purify the steam; The compressor introduces the purified steam into the process.

2. The method for recycling the discharged steam according to the process described in claim 1, wherein , In the step of the control pipeline blocking the communication between the steam collection assembly and the process discharge port after the process stops introducing steam, it further includes the following steps: After the process stops introducing steam and stops discharging steam, the second valve is closed; The steam collection assembly introduces the collected steam into the process.

3. The method for recycling and utilization of the discharged steam according to the process described in claim 1, characterized in that , It further includes a drainer. The second outlet is located below the first inlet, and the drainer is arranged between the second valve and the second outlet. The upper end of the drainer is communicated with the control pipeline; The method for recycling the steam discharged from the process further includes the following steps: The drainer is opened, and the drainer passes the condensed water into the boiler.

4. The method for recycling the discharged steam according to the process described in claim 1, characterized in that , The steam collection assembly further includes a liquid level detector, and a third valve is provided at the lower end of the energy storage device. The liquid level detector is used to detect the liquid level height of the energy storage device; The method for recycling the steam discharged from the process further includes the following steps: When the liquid level detector detects that the liquid level height in the energy storage device reaches the first set threshold, control the third valve to open to discharge the air and liquid water in the energy storage device; When the liquid level detector detects that the liquid level height in the energy storage device drops to the second set threshold, then control the third valve to close.

5. The method for recycling and utilization of the discharged steam according to the process described in claim 4, characterized in that , It further includes a separator. The separator is communicated with the third valve. A first air valve is connected to the upper end of the separator, and a first drain valve is connected to the lower end of the separator; The method for recycling the steam discharged from the process further includes the following steps: The first air valve is opened to discharge the air in the separator, and the first drain valve is opened to discharge the liquid water in the separator.

6. The method for recycling the discharged steam in the process according to claim 5, characterized in that , A plurality of the energy storage devices are provided, and the plurality of energy storage devices are connected in sequence. The plurality of energy storage devices are all communicated with the separator.

7. The method for recycling the discharged steam of the process according to claim 1, characterized in that , The purification device includes an evaporation chamber, a condensation chamber and a suction device; the condensation chamber is connected to the evaporation chamber. The condensation chamber is provided with a second air inlet, a second air outlet and a first drain outlet. The second air inlet is communicated with the first air outlet. The evaporation chamber is provided with a first water inlet and a third air outlet. The suction device is communicated with the third air outlet; the first drain outlet can be communicated with the first water inlet; The method for recycling the steam discharged from the process further includes the following steps; The suction device evacuates the evaporation chamber to make the boiling point temperature of the water in the evaporation chamber lower than the sustainable condensation temperature of the condensation chamber.

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