Hot water preparation device for lyocell fiber production

Abstract

The application discloses a hot water preparation device for lyocell fiber production and relates to the technical field of industrial heat energy engineering and energy saving, which comprises a horizontal oil-fired boiler, a hot water preparation heat exchanger, a hot water circulating pipeline and a circulating water pump. The horizontal oil-fired boiler is connected with the hot water preparation heat exchanger through a steam pipeline. The hot water obtained by heating steam delivered from the horizontal oil-fired boiler is delivered to a dissolving section equipment in lyocell production through a hot water outlet pipeline in the hot water circulating pipeline connected with the hot water preparation heat exchanger. The horizontal oil-fired boiler is adopted to produce high-temperature steam when a main steam source fault or interruption occurs in lyocell fiber production, high-temperature hot water is prepared based on the high-temperature steam and used as process water for lyocell fiber production, so that the decomposition or hardening of glue liquid in the pipeline caused by insufficient or unstable hot water supply is effectively avoided, and the continuous and stable production of lyocell fiber is ensured.

Description

Technical Field

[0001] This application relates to the field of industrial thermal energy engineering and energy-saving technology, and in particular to a hot water preparation device for lyocell fiber production. Background Technology

[0002] Lyocell fiber is a green fiber made from natural plant fibers. Its production process involves multiple steps, including solvent recovery, pulp dissolution, spinning, and post-processing.

[0003] In the actual production of lyocell fibers, hot water is a crucial process medium, widely used in pulp pretreatment, equipment insulation, heating of solvent recovery systems, and cleaning at various stages. Currently, the hot water required for the production process typically relies on steam supply from thermal power plants. The steam is processed by a desuperheating and pressure-reducing device to be converted into hot water at a suitable temperature for production use.

[0004] When a thermal power plant undergoes planned maintenance, or when the steam desuperheating and pressure reducing lines within the workshop malfunction (e.g., valve failure, pressure loss, temperature fluctuations), the steam supply may be interrupted or become highly unstable. This steam supply problem can further hinder hot water preparation. More importantly, in the dissolving section of lyocell fiber production, the prepared adhesive solution typically needs to circulate through insulated pipelines or be transported to the next process. The adhesive solution is highly sensitive to temperature and requires a continuous and stable heat source to maintain its fluidity and prevent solidification. If the hot water supply is interrupted or the temperature drops suddenly due to steam problems, the adhesive solution is highly susceptible to decomposition, solidification, or hardening in the pipelines due to localized temperature drops. This not only causes pipeline blockages, making cleaning and restoration difficult and affecting production continuity, but can also lead to the waste of valuable adhesive solution raw materials and even damage to expensive production equipment, resulting in significant economic losses.

[0005] Therefore, there is an urgent need for a hot water preparation device that does not rely on an external steam supply system and can quickly and stably provide the high-temperature hot water required for the production process when the main steam source fails or is interrupted. This would effectively prevent the glue from decomposing or hardening in the pipeline due to insufficient or unstable hot water supply, and ensure the continuous and stable operation of lyocell fiber production. Utility Model Content

[0006] In view of the above problems, this application provides a hot water preparation device for lyocell fiber production, which can quickly and stably provide the high-temperature hot water required for the production process when the main steam source fails or is interrupted, thereby effectively avoiding the decomposition or hardening of the adhesive in the pipeline due to insufficient or unstable hot water supply. The specific solution is as follows:

[0007] The first aspect of this application provides a hot water preparation apparatus for the production of lyocell fibers, comprising:

[0008] Horizontal oil-fired boiler, hot water preparation heat exchanger, hot water circulation pipeline and circulating water pump;

[0009] The horizontal oil-fired boiler is connected to the hot water preparation heat exchanger via a steam pipeline;

[0010] The hot water preparation heat exchanger is connected to the hot water circulation pipeline; the circulating water pump is installed in the hot water return pipeline of the hot water circulation pipeline; the hot water outlet pipeline in the hot water circulation pipeline is connected to the dissolution section equipment.

[0011] In one possible implementation, a steam flow regulating valve is also included;

[0012] The steam flow regulating valve is installed in the steam pipeline near the hot water preparation heat exchanger.

[0013] In one possible implementation, a temperature acquisition device is also included;

[0014] The temperature acquisition device is installed in the hot water outlet pipeline of the hot water circulation pipeline, near the hot water preparation heat exchanger. The temperature acquisition device is wirelessly connected to the steam flow regulating valve.

[0015] In one possible implementation, a first switching valve and a second switching valve are also included;

[0016] The first switching valve is installed in the steam pipeline of the horizontal oil-fired boiler, near the hot water preparation heat exchanger.

[0017] The second switching valve is installed in the steam pipeline of the external steam supply equipment, near the hot water preparation heat exchanger side.

[0018] In one possible implementation, a water replenishment pump is also included;

[0019] The water supply pump includes the first hot water pipeline;

[0020] The water supply pump is connected to the hot water return line of the hot water circulation line through the first hot water pipeline.

[0021] In one possible implementation, a water replenishment tank is also included;

[0022] The water supply tank includes a first water supply pipeline and a second water supply pipeline;

[0023] The water supply tank is connected to the water supply pump via the first water supply pipeline, and the water supply tank is connected to the horizontal oil-fired boiler via the second water supply pipeline.

[0024] In one possible implementation, a pressure stabilizing tank is also included;

[0025] The pressure stabilizing tank includes a second hot water pipeline and a third hot water pipeline;

[0026] The pressure stabilizing tank is connected to the hot water return line of the hot water circulation pipeline via the second hot water pipeline, and the pressure stabilizing tank is connected to the water supply tank via the third hot water pipeline.

[0027] In one possible implementation, a plate level gauge is installed on the horizontal oil-fired boiler.

[0028] In one possible implementation, the horizontal oil-fired boiler is also equipped with an imported burner.

[0029] In one possible implementation, the horizontal oil-fired boiler is also equipped with a flameout protection device connected to the inlet burner.

[0030] The hot water preparation device for lyocell fiber production provided in this application, utilizing the above technical solution, includes a horizontal oil-fired boiler, a hot water preparation heat exchanger, a hot water circulation pipeline, and a circulating water pump. The horizontal oil-fired boiler is connected to the hot water preparation heat exchanger via a steam pipeline. Hot water heated by steam from the horizontal oil-fired boiler is transported to the dissolution section of the lyocell production line via a hot water outlet pipe in the hot water circulation pipeline connected to the heat exchanger. Additionally, the hot water preparation device for lyocell production also includes a circulating water pump connected to a hot water return pipe in the hot water circulation pipeline. This application utilizes a horizontal oil-fired boiler to produce high-temperature steam when the main steam source fails or is interrupted during lyocell fiber production. High-temperature hot water is then prepared from this high-temperature steam for use as process water in lyocell fiber production, effectively preventing the decomposition or hardening of the adhesive in the pipeline due to insufficient or unstable hot water supply, thus ensuring continuous and stable lyocell fiber production. Attached Figure Description

[0031] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0032] Figure 1 A schematic diagram of the hot water preparation apparatus for lyocell fiber production provided in this application;

[0033] Figure 2 This is an example diagram illustrating the structural composition of a hot water preparation apparatus for lyocell fiber production provided in this application. Detailed Implementation

[0034] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0035] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0036] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0037] In the actual production of lyocell fiber, the required steam is supplied by an external steam supply system, such as a thermal power plant. The power plant delivers superheated steam at 1.0 MPa and 260°C, which is then reduced to saturated steam at 0.5 MPa and 155°C through desuperheating and depressurization in the workshop. The steam pipeline from the power plant to the lyocell fiber production workshop is approximately 5 kilometers long. When the power plant shuts down for maintenance or when there is a leak in the steam pipeline along the route, the steam supply to the entire lyocell fiber production area is completely interrupted. The hot water system, lacking a heat source, experiences a drop in temperature to room temperature. Consequently, the adhesive in the dissolving section of the lyocell fiber production gradually cools, resulting in solidification and hardening. Restarting the plant requires reheating and softening the solidified adhesive to restore its fluidity; otherwise, it can easily damage the equipment. This softening process takes a considerable amount of time.

[0038] To address the aforementioned issues, this application provides a hot water preparation device for lyocell production that does not rely on an external steam supply system and can quickly and stably provide the high-temperature hot water required for the production process when the main steam source fails or is interrupted. This effectively prevents the adhesive from decomposing or hardening in the pipeline due to insufficient or unstable hot water supply, ensuring the continuous and stable operation of lyocell fiber production.

[0039] Optional, see Figure 1 The present application provides a schematic diagram of the hot water preparation device for lyocell fiber production.

[0040] like Figure 1 As shown, the hot water preparation device for lyocell fiber production provided in this application includes a horizontal oil-fired boiler 1, a hot water preparation heat exchanger 2, a hot water circulation pipeline 3, and a circulating water pump 4.

[0041] Among them, the horizontal oil-fired boiler 1 is mainly used for producing high-temperature steam. Its working process is as follows:

[0042] Fuel oil is atomized by an inlet burner, mixed with air supplied by a blower, and ignited to produce a high-stability flame and flue gas in the furnace. The flue gas flows through the flue pipes inside the boiler, continuously transferring heat to the boiler water outside the metal pipe walls. After absorbing enough heat, the water inside the boiler vaporizes to obtain a steam-water mixture. The steam-water mixture rises to the steam drum, where steam accumulates and is output from the top, and is transported to the hot water preparation heat exchanger through steam pipelines.

[0043] The horizontal oil-fired boiler 1 includes a plate water level gauge, an inlet burner, and a flameout protection device connected to the inlet burner.

[0044] Fuel oil burns in the boiler's combustion chamber, continuously heating the steam drum. This heats and evaporates the water in the steam drum, producing steam. If the liquid level in the steam drum is too high, it reduces the steam space, decreases the steam-water separation effect, and causes the steam to carry a large amount of saturated water vapor, increasing the steam's salt content. These salts deposit on the superheater tube walls, causing heat transfer deterioration, tube wall overheating, and potentially leading to tube rupture. Conversely, a low water level may allow high-temperature flue gas to directly heat pressure-bearing components without water protection (such as the steam drum itself), causing a sudden drop in material strength and potentially triggering a physical explosion.

[0045] To avoid the above problems, the horizontal oil-fired boiler 1 provided in this application is equipped with a plate level gauge. The plate level gauge is used to accurately collect the water level in the boiler drum. It works based on the principle of communicating vessels. The water level in the gauge is consistent with the water level in the boiler drum, providing an intuitive water level display. When the water level is too high or too low, an alarm is issued or the water level is directly controlled by the feedwater pump. It should also be noted that the water level gauge signal of the plate level gauge can be interlocked with the inlet burner in the horizontal oil-fired boiler 1 to ensure the safety of the entire horizontal oil-fired boiler 1.

[0046] The flameout protection device installed in the inlet burner functions to detect the combustion status. When ignition fails or combustion is interrupted, the inlet burner immediately closes the oil inlet solenoid valve. At this time, the blower continues to run to purge the residual combustible gas in the furnace. After 20 to 30 seconds of purging, the power supply to the blower and various auxiliary machines is automatically cut off, and the boiler stops running. The flameout protection device mainly consists of a flame detector and a program control device. The flame detector usually uses an ultraviolet phototube to directly observe the flame. As long as there is a stable flame burning, the ultraviolet phototube can detect the unique ultraviolet signal of the flame and continuously send a "normal" signal to the program control device. If the program control device does not receive a normal signal from the flame detector within a preset time, it will immediately execute a series of operations such as valve closing, purging, boiler shutdown, and alarm according to the predetermined program.

[0047] Specifically, the use of the horizontal oil-fired boiler 1 allows the hot water temperature in the adhesive pipeline to be controlled at a preset temperature of 70 degrees Celsius when other equipment in the lyocell fiber production process is shut down. At this temperature, the adhesive is far from its decomposition temperature of 120 degrees Celsius and will not solidify or harden. In actual production, raising the adhesive temperature from 70 degrees Celsius to the normal production temperature of 100 degrees Celsius would take at least 10 hours. The horizontal oil-fired boiler can preheat the hot water, thereby reducing downtime and minimizing overall economic losses from downtime.

[0048] The hot water preparation heat exchanger 2 is used to exchange heat between the high-temperature steam transported by the horizontal oil-fired boiler 1 through the steam pipeline and the water in the hot water preparation heat exchanger 2. After heating the low-temperature water in the hot water preparation heat exchanger 2 to high-temperature hot water, it is transported to the dissolution section equipment through the hot water outlet pipeline of the hot water circulation pipeline.

[0049] The hot water circulation pipeline 3 includes a hot water outlet pipeline and a hot water return pipeline. It transports the high-temperature hot water prepared by the hot water preparation heat exchanger 2 to each water point through the hot water outlet pipeline, and then recovers the used water back to the hot water preparation heat exchanger 2 through the hot water return pipeline, forming a closed loop. It should be noted that the power of the hot water circulation pipeline 3 is provided by the circulating water pump 4.

[0050] In summary, the hot water preparation device for lyocell fiber production provided in this application includes a horizontal oil-fired boiler, a hot water preparation heat exchanger, a hot water circulation pipeline, and a circulating water pump. The horizontal oil-fired boiler is connected to the hot water preparation heat exchanger via a steam pipeline. Hot water heated by steam from the horizontal oil-fired boiler is transported to the dissolution section of the lyocell production line via a hot water outlet pipe in the hot water circulation pipeline connected to the heat exchanger. Additionally, the hot water preparation device for lyocell production also includes a circulating water pump connected to a hot water return pipe in the hot water circulation pipeline. This application utilizes a horizontal oil-fired boiler to produce high-temperature steam when the main steam source fails or is interrupted during lyocell fiber production. High-temperature hot water is then prepared from this high-temperature steam for use as process water in lyocell fiber production, effectively preventing the decomposition or hardening of the adhesive in the pipeline due to insufficient or unstable hot water supply, thus ensuring continuous and stable lyocell fiber production.

[0051] Optional, see Figure 2 This application provides an example diagram of the structural composition of a hot water preparation apparatus for lyocell fiber production.

[0052] like Figure 2 As shown, the hot water preparation device for lyocell fiber production provided in this application also includes a steam flow regulating valve c, which is installed in the steam pipeline near the hot water preparation heat exchanger.

[0053] The hot water preparation device for lyocell fiber production also includes a temperature acquisition device, specifically such as... Figure 2 The thermometer shown is used to collect temperature signals. After the temperature acquisition device collects the temperature signals, the processor processes the temperature signals to obtain temperature information. The thermometer is wirelessly connected to the steam flow regulating valve c. The two are set up with an interlock program. When the thermometer detects a change in the hot water flow that causes the temperature to rise or fall, the steam flow regulating valve c will automatically adjust its opening. By adjusting the steam consumption, the temperature of the hot water generated in the hot water preparation heat exchanger tends to be stable, which meets the needs of the lyocell fiber production process.

[0054] The hot water preparation device for lyocell fiber production also includes a first switching valve b and a second switching valve a. The first switching valve b is installed in the steam pipeline of the horizontal oil-fired boiler near the hot water preparation heat exchanger side, and the second switching valve a is installed in the steam pipeline of the external steam supply equipment near the hot water preparation heat exchanger side.

[0055] In practical applications, when the power plant is supplying steam normally, the second switch valve a and the first switch valve b in the diagram are opened, and the steam flow regulating valve c is closed, so the horizontal oil-fired boiler is in standby mode; when the power plant is under maintenance, the second switch valve a is closed, the steam flow regulating valve c is opened, and the horizontal oil-fired boiler is started to generate steam for hot water preparation heat exchangers.

[0056] The hot water preparation device for lyocell fiber production also includes a water replenishment pump, which includes a first hot water pipeline. The water replenishment pump is connected to the hot water return pipeline of the hot water circulation pipeline through the first hot water pipeline and is used to replenish water when the amount of hot water in the hot water circulation pipeline is insufficient.

[0057] The hot water preparation device for lyocell fiber production also includes a water supply tank, which includes a first water supply pipeline and a second water supply pipeline. The water supply tank is connected to a water supply pump through the first water supply pipeline, and the water in the water supply tank is pumped into the hot water circulation pipeline. The water supply tank is connected to a horizontal oil-fired boiler through the second water supply pipeline, and provides condensate water to the horizontal oil-fired boiler, thereby reducing the overall water consumption.

[0058] The hot water preparation unit for lyocell fiber production also includes a pressure stabilizing tank, which comprises a second hot water pipeline and a third hot water pipeline. The pressure stabilizing tank is connected to the hot water return pipeline of the hot water circulation pipeline via the second hot water pipeline, and to the makeup water tank via the third hot water pipeline. When the pressure in the hot water circulation pipeline is too high, some hot water can flow into the pressure stabilizing tank through the second hot water pipeline to balance the pressure.

[0059] The application of this application has yielded significant economic benefits. For example, during a power plant overhaul, using a horizontal oil-fired boiler to insulate the adhesive in the adhesive pipeline reduced production losses by approximately 350,000 yuan. The boiler consumed approximately 4 tons of diesel fuel during the overhaul, equivalent to 30,000 yuan. Therefore, the economic benefit of this application during this power plant overhaul was 310,000 yuan. It is evident that the longer the steam supply to the power plant is interrupted, and the longer the required insulation time after restoration, the greater the economic benefit from using an oil-fired boiler.

[0060] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0062] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.

[0063] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

Claims

1. A hot water preparation apparatus for lyocell fiber production, characterized in that, include: Horizontal oil-fired boiler, hot water preparation heat exchanger, hot water circulation pipeline and circulating water pump; The horizontal oil-fired boiler is connected to the hot water preparation heat exchanger via a steam pipeline. The hot water preparation heat exchanger is connected to the hot water circulation pipeline; the circulating water pump is installed in the hot water return pipeline of the hot water circulation pipeline; The hot water outlet pipeline in the hot water circulation pipeline is connected to the dissolving section equipment.

2. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, It also includes steam flow regulating valves; The steam flow regulating valve is installed in the steam pipeline near the hot water preparation heat exchanger.

3. The hot water preparation apparatus for lyocell fiber production according to claim 2, characterized in that, It also includes a temperature acquisition device; The temperature acquisition device is installed in the hot water outlet pipeline of the hot water circulation pipeline near the hot water preparation heat exchanger side, and the temperature acquisition device is wirelessly connected to the steam flow regulating valve.

4. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, It also includes a first switching valve and a second switching valve; The first switching valve is installed in the steam pipeline of the horizontal oil-fired boiler near the hot water preparation heat exchanger. The second switching valve is installed in the steam pipeline of the external steam supply equipment near the side of the hot water preparation heat exchanger.

5. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, It also includes a water replenishment pump; The water supply pump includes a first hot water pipeline; The water supply pump is connected to the hot water return line of the hot water circulation pipeline through the first hot water pipeline.

6. The hot water preparation apparatus for lyocell fiber production according to claim 5, characterized in that, It also includes a water replenishment tank; The water supply tank includes a first water supply pipeline and a second water supply pipeline; The water supply tank is connected to the water supply pump via the first water supply pipeline, and the water supply tank is connected to the horizontal oil-fired boiler via the second water supply pipeline.

7. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, It also includes a pressure stabilizing tank; The pressure stabilizing tank includes a second hot water pipeline and a third hot water pipeline; The pressure stabilizing tank is connected to the hot water return line of the hot water circulation pipeline via the second hot water pipeline, and the pressure stabilizing tank is connected to the water supply tank via the third hot water pipeline.

8. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, The horizontal oil-fired boiler is equipped with a plate-type water level gauge.

9. The hot water preparation apparatus for lyocell fiber production according to claim 1, characterized in that, The horizontal oil-fired boiler is also equipped with an imported burner.

10. The hot water preparation apparatus for lyocell fiber production according to claim 9, characterized in that, The horizontal oil-fired boiler is also equipped with a flameout protection device connected to the inlet burner.

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