Desalted water supply guaranteeing production system in heating season

Abstract

The invention belongs to the technical field of demineralized water production, and relates to a heating season demineralized water supply guaranteeing production system which comprises a low-low pressure steam conveying assembly, a demineralized water supply guaranteeing assembly and a demineralized water supply guaranteeing assembly. The low-pressure steam conveying assembly is used for conveying low-pressure steam; the pressure adjusting assembly is used for adjusting the pressure of the low-pressure steam and / or the low-pressure steam; the pressure adjusting assembly is connected with the low-pressure steam conveying assembly and the low-pressure steam conveying assembly. The demineralized water conveying assembly is used for conveying demineralized water; the demineralized water conveying assembly is connected with the low-pressure steam conveying assembly and the low-pressure steam conveying assembly. The fluid conveying assembly is used for conveying fluid; the fluid conveying assembly is connected with the low-pressure steam conveying assembly and the demineralized water conveying assembly. Under the conditions that steam is insufficient in the heating season and the water conveying pipeline is broken, it can be guaranteed that the demineralized water is supplied to all production procedures stably and safely.

Description

Technical Field

[0001] The present invention relates to the technical field of demineralized water production, and particularly to a demineralized water supply guarantee production system during the heating season. Background Art

[0002] Demineralized water is an indispensable energy substance in steel production, involving all furnace kiln processes in the entire steel production process, and is mainly used for equipment cooling, strip cleaning, boiler water replenishment, etc.

[0003] To meet the demand for demineralized water, coastal steel enterprises generally produce demineralized water through seawater desalination devices and transport it to each user through pipelines. However, in winter in the north, the temperature is low and the seawater temperature is low, which not only affects the output of the seawater desalination device but also increases the probability of pipeline rupture and damage. During the heating season, the steam in the steel plant is in short supply, and the output of demineralized water will decrease with the reduction of the steam volume. If the water supply pipeline fails, it will lead to a reduction in the operating efficiency of the main steel production processes, and even the production line will stop.

[0004] Currently, when accidents such as demineralized water pipe rupture and leakage occur, the steel plant will quickly carry out on-site monitoring and emergency repair work, coordinate with water-using units to reduce water replenishment and drainage, and coordinate with external water supply companies to increase the water supply volume to ensure the continuity and safety of production. However, there is a time difference between temporarily coordinating water reduction and water increase and the continuity of production. During the coordination process, the operating efficiency of processes such as coking, hot rolling, and cold rolling will inevitably decrease, the process speed will decrease, the production line will stop rolling, and the strip cleaning quality will be affected. Summary of the Invention

[0005] In view of this, the present invention provides a demineralized water supply guarantee production system during the heating season.

[0006] Specifically, the present invention is implemented through the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a demineralized water supply guarantee production system during the heating season, including:

[0008] A low-low pressure steam transmission component for transmitting low-low pressure steam;

[0009] A low pressure steam transmission component for transmitting low pressure steam;

[0010] A pressure regulating component for regulating the pressure of the low-low pressure steam and / or the low pressure steam; the pressure regulating component is respectively connected to the low-low pressure steam transmission component and the low pressure steam transmission component;

[0011] A demineralized water transmission component for transmitting demineralized water; the demineralized water transmission component is respectively connected to the low-low pressure steam transmission component and the low pressure steam transmission component;

[0012] A fluid delivery assembly for delivering fluid; the fluid delivery assembly is respectively connected to the low-low pressure steam delivery assembly and the demineralized water delivery assembly.

[0013] Optionally, the low-low pressure steam delivery assembly includes: a low-low pressure steam pipe network and a first low-temperature multi-effect evaporator, wherein the low-low pressure steam pipe network is connected to the first low-temperature multi-effect evaporator.

[0014] Optionally, the low-low pressure steam delivery assembly further includes: a second low-temperature multi-effect evaporator, and the second low-temperature multi-effect evaporator is connected to the low-low pressure steam pipe network.

[0015] Optionally, the low-pressure steam delivery assembly includes: a low-pressure steam pipe network and a third low-temperature multi-effect evaporator, wherein the low-pressure steam pipe network is respectively connected to the third low-temperature multi-effect evaporator and the pressure regulating assembly.

[0016] Optionally, the low-pressure steam delivery assembly further includes: a fourth low-temperature multi-effect evaporator, and the fourth low-temperature multi-effect evaporator is connected to the low-pressure steam pipe network.

[0017] Optionally, the low-pressure steam delivery assembly further includes: a fifth low-temperature multi-effect evaporator, and the fifth low-temperature multi-effect evaporator is connected to the low-pressure steam pipe network.

[0018] Optionally, the pressure regulating assembly includes: a first low-pressure steam inlet valve, a first thermal compressor, and a first steam extraction valve, wherein the first low-pressure steam inlet valve is respectively connected to the first thermal compressor and the low-pressure steam pipe network in the low-pressure steam delivery assembly, and the first steam extraction valve is respectively connected to the first thermal compressor and the first low-temperature multi-effect evaporator in the low-low pressure steam delivery assembly.

[0019] Optionally, the pressure regulating assembly further includes: a second low-pressure steam inlet valve, a second thermal compressor, and a second steam extraction valve, wherein the second low-pressure steam inlet valve is respectively connected to the low-pressure steam pipe network and the second thermal compressor, and the second steam extraction valve is respectively connected to the second thermal compressor and the second low-temperature multi-effect evaporator in the low-low pressure steam delivery assembly.

[0020] Optionally, the demineralized water delivery assembly includes: a demineralized water storage tank, a demineralized water pump, and a demineralized water pipe network, wherein the demineralized water storage tank is respectively connected to the first low-temperature multi-effect evaporator and the second low-temperature multi-effect evaporator in the low-low pressure steam delivery assembly, the third low-temperature multi-effect evaporator and the fourth low-temperature multi-effect evaporator in the low-pressure steam delivery assembly, and the demineralized water pump, and the demineralized water pipe network is respectively connected to the demineralized water pump and the fifth low-temperature multi-effect evaporator in the low-pressure steam delivery assembly.

[0021] Optionally, the fluid delivery assembly includes: a desalted water pipe, a water inlet valve, a drain pipe, and a drain valve. Among them, the desalted water pipe is respectively connected to the fifth low-temperature multi-effect evaporator in the low-low pressure steam delivery assembly and the desalted water storage tank in the desalted water delivery assembly. The water inlet valve is arranged on the desalted water pipe. The first end of the drain pipe is connected to the desalted water pipe and the second end is open to the air. The drain valve is arranged on the drain pipe.

[0022] The technical solution provided by the present invention at least brings the following beneficial effects:

[0023] A desalted water supply guarantee production system provided by the present application adjusts the operation mode of the seawater desalination device, changes the desalted water supply route, and converts the operation mode of the desalted water pump to ensure that the desalted water is supplied to each production process in a guaranteed quantity, stable manner, and safely in the case of insufficient steam in the heating season and a broken water delivery pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or related technical descriptions. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of a desalted water supply guarantee production system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] Figure 1 A desalted water supply guarantee production system suitable for the embodiments of the present invention is schematically shown.

[0029] Referring to Figure 1 As shown, the present application provides a desalted water supply guarantee production system in the heating season, including:

[0030] A low-low pressure steam delivery assembly for delivering low-low pressure steam;

[0031] Low-pressure steam delivery assembly, for delivering low-pressure steam;

[0032] Pressure regulation assembly, for regulating the pressure of the very low-pressure steam and / or the low-pressure steam; the pressure regulation assembly is respectively connected to the very low-pressure steam delivery assembly and the low-pressure steam delivery assembly;

[0033] Demineralized water delivery assembly, for delivering demineralized water; the demineralized water delivery assembly is respectively connected to the very low-pressure steam delivery assembly and the low-pressure steam delivery assembly;

[0034] Fluid delivery assembly, for delivering fluid; the fluid delivery assembly is respectively connected to the low-pressure steam delivery assembly and the demineralized water delivery assembly.

[0035] In an embodiment of the present application, during normal production operation, the very low-pressure steam delivery assembly delivers very low-pressure steam, the low-pressure steam delivery assembly delivers low-pressure steam, the pressure regulation assembly regulates the pressure of the very low-pressure steam and / or the low-pressure steam, the steam exchanges heat with seawater under negative pressure, part of the seawater flashes into steam and condenses into demineralized water, and reaches each user through the demineralized water delivery assembly. When a breakage fault suddenly occurs in the demineralized water pipe network in the demineralized water delivery assembly, the demineralized water is delivered to the demineralized water delivery assembly through the fluid delivery assembly.

[0036] Exemplarily, the very low-pressure steam delivery assembly includes: a very low-pressure steam pipe network 11 and a first low-temperature multi-effect evaporator 12, wherein the very low-pressure steam pipe network 11 is connected to the first low-temperature multi-effect evaporator 12.

[0037] In an embodiment of the present application, the very low-pressure steam pipe network 11 is used to deliver very low-pressure steam to the first low-temperature multi-effect evaporator 12, and the steam in the first low-temperature multi-effect evaporator 12 exchanges heat with seawater under negative pressure, part of the seawater flashes into steam and condenses into demineralized water.

[0038] Exemplarily, the very low-pressure steam delivery assembly further includes: a second low-temperature multi-effect evaporator 13, and the second low-temperature multi-effect evaporator 13 is connected to the very low-pressure steam pipe network 11.

[0039] In an embodiment of the present application, the very low-pressure steam pipe network 11 is used to deliver very low-pressure steam to the second low-temperature multi-effect evaporator 13, and the steam in the second low-temperature multi-effect evaporator 13 exchanges heat with seawater under negative pressure, part of the seawater flashes into steam and condenses into demineralized water.

[0040] Exemplarily, the low-pressure steam delivery assembly includes: a low-pressure steam pipe network 21 and a third low-temperature multi-effect evaporator 22, wherein the low-pressure steam pipe network 21 is respectively connected to the third low-temperature multi-effect evaporator 22 and the pressure regulation assembly.

[0041] In an embodiment of the present application, the low-pressure steam pipe network 21 is used to supply low-pressure steam to the third low-temperature multi-effect evaporator 22. The steam in the third low-temperature multi-effect evaporator 22 exchanges heat with seawater under negative pressure, and part of the seawater flashes into steam and condenses into desalted water.

[0042] Exemplarily, the low-pressure steam delivery assembly further includes: a fourth low-temperature multi-effect evaporator 23, and the fourth low-temperature multi-effect evaporator 23 is connected to the low-pressure steam pipe network 21.

[0043] In an embodiment of the present application, the low-pressure steam pipe network 21 is used to supply low-pressure steam to the fourth low-temperature multi-effect evaporator 23. The steam in the fourth low-temperature multi-effect evaporator 23 exchanges heat with seawater under negative pressure, and part of the seawater flashes into steam and condenses into desalted water.

[0044] Exemplarily, the low-pressure steam delivery assembly further includes: a fifth low-temperature multi-effect evaporator 24, and the fifth low-temperature multi-effect evaporator 24 is connected to the low-pressure steam pipe network 21.

[0045] In an embodiment of the present application, the low-pressure steam pipe network 21 is used to supply low-pressure steam to the fifth low-temperature multi-effect evaporator 24. The steam in the fifth low-temperature multi-effect evaporator 24 exchanges heat with seawater under negative pressure, and part of the seawater flashes into steam and condenses into desalted water.

[0046] Exemplarily, the pressure regulation assembly includes: a first low-pressure steam inlet valve 31, a first thermal compressor 32, and a first steam extraction valve 33. Among them, the first low-pressure steam inlet valve 31 is respectively connected to the first thermal compressor 32 and the low-pressure steam pipe network 21 in the low-pressure steam delivery assembly, and the first steam extraction valve 33 is respectively connected to the first thermal compressor 32 and the first low-temperature multi-effect evaporator 12 in the low-pressure steam delivery assembly.

[0047] In an embodiment of the present application, low-pressure steam enters the first thermal compressor 32 from the low-pressure steam pipe network 21 through the first low-pressure steam inlet valve 31. After the first thermal compressor adjusts the pressure of the steam, it is delivered to the first low-temperature multi-effect evaporator 12 through the first steam extraction valve 33.

[0048] Exemplarily, the pressure regulation assembly further includes: a second low-pressure steam inlet valve 34, a second thermal compressor 35, and a second steam extraction valve 36. Among them, the second low-pressure steam inlet valve 34 is respectively connected to the low-pressure steam pipe network 21 and the second thermal compressor 35, and the second steam extraction valve 36 is respectively connected to the second thermal compressor 35 and the second low-temperature multi-effect evaporator 13 in the low-pressure steam delivery assembly.

[0049] In an embodiment of the present application, low-pressure steam enters the second thermocompressor 35 from the low-pressure steam pipe network 21 via the second low-pressure steam inlet valve 34. After the second thermocompressor 35 adjusts the pressure of the steam, it is transported to the second low-temperature multi-effect evaporator 13 via the second extraction valve 36.

[0050] Exemplarily, the demineralized water delivery assembly includes: a demineralized water storage tank 41, a demineralized water pump 42, and a demineralized water pipe network 43. Among them, the demineralized water storage tank 41 is respectively connected to the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13 in the low-low-pressure steam delivery assembly, the third low-temperature multi-effect evaporator 22 and the fourth low-temperature multi-effect evaporator 23 in the low-pressure steam delivery assembly, and the demineralized water pump 42. The demineralized water pipe network 43 is respectively connected to the demineralized water pump 42 and the fifth low-temperature multi-effect evaporator 24 in the low-pressure steam delivery assembly.

[0051] In an embodiment of the present application, the demineralized water output from the first low-temperature multi-effect evaporator 12, the second low-temperature multi-effect evaporator 13, the third low-temperature multi-effect evaporator 22, and the fourth low-temperature multi-effect evaporator 23 is transported to the demineralized water storage tank 41, and is transported to the demineralized water pipe network 43 under the pumping action of the demineralized water pump 42, and then reaches each user.

[0052] Exemplarily, the fluid delivery assembly includes: a demineralized water pipe 51, an inlet valve 52, a drain pipe 53, and a drain valve 54. Among them, the demineralized water pipe 51 is respectively connected to the fifth low-temperature multi-effect evaporator 24 in the low-pressure steam delivery assembly and the demineralized water storage tank 41 in the demineralized water delivery assembly. The inlet valve 52 is arranged on the demineralized water pipe 51. The first end of the drain pipe 53 is connected to the demineralized water pipe 51 and the second end is open to the air. The drain valve 54 is arranged on the drain pipe 53.

[0053] In an embodiment of the present application, when a sudden breakage fault occurs in the demineralized water pipe network 43 (such as Figure 1 at point A), the demineralized water supply mode is adjusted. At this time, the valve between the demineralized water pump 42 and the demineralized water pipe network 43 is closed, and the demineralized water is stored in the demineralized water storage tank 41; when the pressure in the demineralized water storage tank 41 reaches a certain value, the drain valve 54 is opened at this time, and the demineralized water is discharged via the drain pipe 53. When the pressure in the demineralized water storage tank 41 drops to a certain value, the inlet valve 52 is opened, and the drain valve 54 is closed to stabilize the liquid level of the demineralized water storage tank 41.

[0054] The present application provides a demineralized water supply guarantee production system for the heating season with the following innovations:

[0055] (1) Adjust the gas source: In the prior art, the original gas source of the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13 is low-low-pressure steam. After the low-low-pressure steam enters the first-effect heat exchange tubes of the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13 respectively and exchanges heat with seawater, part of the seawater evaporates into steam and enters the next-effect heat exchange tubes, and then the heat exchange process is repeated. To increase the steam enthalpy value, a desalted water supply production system during the heating season provided by the present application lays a branch from the low-pressure steam pipe network 21 to the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13, and a first low-pressure steam inlet valve 31 and a second low-pressure steam inlet valve 34 are added to the branch of the low-pressure steam pipe, which are used to send low-pressure steam into the first heat compressor 32 and the second heat compressor 35 respectively. The first heat compressor 32 and the second heat compressor 35 send it into the first effect, and exchange heat with seawater in the first effect together with the low-low-pressure steam. At the same time, the first heat compressor 32 and the second heat compressor 35 respectively extract the steam to be condensed at the end effect of the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13 through the first steam extraction valve 33 and the second steam extraction valve 36, mix it with the low-pressure steam and then send it into the first effect of the first low-temperature multi-effect evaporator 12 and the second low-temperature multi-effect evaporator 13 again, repeat mixing with the low-low-pressure steam, enter the first effect to exchange heat with seawater, improve the steam utilization rate, and increase the desalted water production.

[0056] (2) Adjust the desalted water supply mode: A desalted water supply production system during the heating season provided by the present application adjusts the mode of directly sending the produced water of the fifth low-temperature multi-effect evaporator 24 in the prior art to the desalted water pipe network 43 to the mode of sending the produced water to the desalted water storage tank 41, and a pipeline and multiple valves between the fifth low-temperature multi-effect evaporator 24 and the desalted water storage tank 41 are newly added. Close the valve between the fifth low-temperature multi-effect evaporator 24 and the desalted water pipe network 43. When the pressure of the desalted water heat exchanger reaches 0.16 MPa, open the drain valve 54 for the produced water of the fifth low-temperature multi-effect evaporator 24 to enter the desalted water storage tank 41, control the water output of the drain pipe 53. After the conductivity is qualified, open the inlet valve 52 and close the drain valve 54 to stabilize the liquid level of the desalted water storage tank 41.

[0057] (3) Adjust the operation mode of the desalted water delivery pump: A desalted water supply production system during the heating season provided by the present application adjusts the operation mode of the desalted water pump 42 in the prior art, which operates with 2 frequency-converting pumps and 1 industrial-frequency pump at the same time, to the operation mode of 2 frequency-converting pumps and 1 industrial-frequency pump operating at the same time in the present application. One of the frequency-converting pumps is in the manual control mode, which can ensure the desalted water supply pressure and flow rate, and avoid the operator from frequently adjusting the valve opening degree back and forth on site.

[0058] When the desalted water supply production system provided by this application has insufficient steam during the heating season and the water conveyance pipeline is broken, it adjusts the operation mode of the seawater desalination device, changes the desalted water supply route, and converts the operation mode of the desalted water pump to ensure that the desalted water is supplied to each production process in a guaranteed quantity, stably, and safely.

[0059] It should be noted that in this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0060] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0061] In addition, the terms "install", "set", "be provided with", "connect", "be connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements, or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0063] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A demineralized water supply production system during the heating season, characterized in that, Comprising: A very low - pressure steam delivery assembly for delivering very low - pressure steam; A low - pressure steam delivery assembly for delivering low - pressure steam; A pressure regulating assembly for regulating the pressure of the very low - pressure steam and / or the low - pressure steam; the pressure regulating assembly is respectively connected to the very low - pressure steam delivery assembly and the low - pressure steam delivery assembly; A demineralized water delivery assembly for delivering demineralized water; the demineralized water delivery assembly is respectively connected to the very low - pressure steam delivery assembly and the low - pressure steam delivery assembly; A fluid delivery assembly for delivering fluid; the fluid delivery assembly is respectively connected to the low - pressure steam delivery assembly and the demineralized water delivery assembly.

2. The demineralized water supply and production system during the heating season according to claim 1, wherein The very low - pressure steam delivery assembly includes: a very low - pressure steam pipe network and a first low - temperature multi - effect evaporator, wherein the very low - pressure steam pipe network is connected to the first low - temperature multi - effect evaporator.

3. The demineralized water supply production system during the heating season according to claim 2, wherein The very low - pressure steam delivery assembly further includes: a second low - temperature multi - effect evaporator, and the second low - temperature multi - effect evaporator is connected to the very low - pressure steam pipe network.

4. The demineralized water supply and production system during the heating season according to claim 1, characterized in that, The low - pressure steam delivery assembly includes: a low - pressure steam pipe network and a third low - temperature multi - effect evaporator, wherein the low - pressure steam pipe network is respectively connected to the third low - temperature multi - effect evaporator and the pressure regulating assembly.

5. The demineralized water supply production system during the heating season according to claim 4, wherein The low - pressure steam delivery assembly further includes: a fourth low - temperature multi - effect evaporator, and the fourth low - temperature multi - effect evaporator is connected to the low - pressure steam pipe network.

6. The demineralized water supply production system during the heating season according to claim 4, wherein The low - pressure steam delivery assembly further includes: a fifth low - temperature multi - effect evaporator, and the fifth low - temperature multi - effect evaporator is connected to the low - pressure steam pipe network.

7. The demineralized water supply production system during the heating season according to claim 1, characterized in that, The pressure regulating assembly includes: a first low - pressure steam inlet valve, a first heat compressor, and a first steam extraction valve, wherein the first low - pressure steam inlet valve is respectively connected to the first heat compressor and the low - pressure steam pipe network in the low - pressure steam delivery assembly, and the first steam extraction valve is respectively connected to the first heat compressor and the first low - temperature multi - effect evaporator in the very low - pressure steam delivery assembly.

8. The demineralized water supply production system during the heating season according to claim 7, wherein The pressure regulating assembly further includes: a second low - pressure steam inlet valve, a second heat compressor, and a second steam extraction valve, wherein the second low - pressure steam inlet valve is respectively connected to the low - pressure steam pipe network and the second heat compressor, and the second steam extraction valve is respectively connected to the second heat compressor and the second low - temperature multi - effect evaporator in the very low - pressure steam delivery assembly.

9. The demineralized water supply production system during the heating season according to claim 1, wherein The demineralized water delivery assembly includes: a demineralized water storage tank, a demineralized water pump, and a demineralized water pipe network, wherein the demineralized water storage tank is respectively connected to the first low - temperature multi - effect evaporator and the second low - temperature multi - effect evaporator in the very low - pressure steam delivery assembly, the third low - temperature multi - effect evaporator and the fourth low - temperature multi - effect evaporator in the low - pressure steam delivery assembly, and the demineralized water pump, and the demineralized water pipe network is respectively connected to the demineralized water pump and the fifth low - temperature multi - effect evaporator in the low - pressure steam delivery assembly.

10. The demineralized water supply and production system during the heating season according to claim 1, characterized in that, The fluid delivery assembly includes: a demineralized water pipe, a water inlet valve, a drain pipe, and a drain valve. Among them, the demineralized water pipe is respectively connected to the fifth low-temperature multi-effect evaporator in the low-pressure steam delivery assembly and the demineralized water storage tank in the demineralized water delivery assembly. The water inlet valve is arranged on the demineralized water pipe. The first end of the drain pipe is connected to the demineralized water pipe and the second end is open to the air. The drain valve is arranged on the drain pipe.

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