A low-parameter, wide-load long-distance steam pipeline system and its operation method

Abstract

This invention belongs to the field of steam pipeline design and provides a low-parameter, wide-load, long-distance steam pipeline system and its operation method. The low-parameter, wide-load, long-distance steam pipeline system includes a demineralized water pipeline and a steam pipeline. One end of the demineralized water pipeline is connected to a demineralized water tank, and the other end is connected to the inlet of a steam generator. One end of the steam pipeline is connected to the outlet of the steam generator, and the other end is connected to an industrial steam user. The steam pipeline includes a first steam connection pipeline, a second steam connection pipeline, and a dual-pipeline long-distance steam pipeline. The two ends of the dual-pipeline long-distance steam pipeline are respectively connected to the first steam connection pipeline and the second steam connection pipeline. Each pipeline in the dual-pipeline long-distance steam pipeline is equipped with a shut-off valve at both ends. The shut-off valve adjusts the outlet steam parameters of the steam generator and the corresponding operation mode of the dual-pipeline long-distance steam pipeline according to the pipeline flow conditions and the pressure and temperature requirements of the industrial steam user.

Description

Technical Field

[0001] This invention belongs to the field of steam pipeline design, and particularly relates to a low-parameter, wide-load, long-distance steam pipeline system and its operation method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the increasing scope and scale of industrial steam transportation, under conditions of low and limited steam source parameters, longer steam transportation distances or wide-load fluctuations in flow rate can cause steam parameters to fail to meet user needs. Current technologies lack steam pipeline systems that can simultaneously meet the three requirements of low parameters, wide load range, and long-distance transportation. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a low-parameter, wide-load, long-distance steam pipeline system and its operation method, which can fully utilize the heat from a low-temperature heat source to generate low-parameter industrial steam, and can simultaneously realize long-distance transportation and wide-load fluctuation of industrial steam to meet the needs of industrial users.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention provides a low-parameter, wide-load, long-distance steam pipeline system.

[0007] A low-parameter, wide-load, long-distance steam pipeline system includes: a demineralized water pipeline and a steam pipeline;

[0008] One end of the demineralized water pipeline is connected to the demineralized water tank, and the other end is connected to the inlet of the steam generator; wherein, the demineralized water entering the steam generator is heated by a low-temperature heat source; one end of the steam pipeline is connected to the outlet of the steam generator, and the other end is connected to the industrial steam user end;

[0009] The steam pipeline includes a first steam connection pipeline, a second steam connection pipeline, and a dual-pipeline long-distance steam pipeline; the two ends of the dual-pipeline long-distance steam pipeline are respectively connected to the first steam connection pipeline and the second steam connection pipeline; the outlet steam parameters of the steam generator and the operating mode of the dual-pipeline long-distance steam pipeline are determined by the pipeline flow conditions and the pressure and temperature requirements of the industrial steam user.

[0010] As one implementation method, the operation mode of the dual-pipeline long-distance steam pipeline includes single-pipeline operation mode and dual-pipeline operation mode.

[0011] In one embodiment, the outlet steam parameters of the steam generator include outlet steam pressure and outlet steam temperature; wherein, the outlet steam temperature remains constant, while the outlet steam pressure is adjustable.

[0012] As one implementation method, when the outlet steam pressure of the steam generator remains constant, a combination of single and double pipe operation is adopted.

[0013] As one implementation method, under the same pipe diameter, numerical simulation is used to determine the relationship between the operating mode, outlet steam pressure, and outlet steam temperature of the dual-pipeline long-distance steam pipeline and the pipeline flow rate, industrial steam user end pressure, and industrial steam user end temperature.

[0014] In one embodiment, a water supply pump connected in parallel is also provided at one end of the demineralized water pipeline connected to the demineralized water tank.

[0015] In one implementation, each of the water pumps is connected to a frequency converter.

[0016] As one implementation method, flow measurement devices are installed on both the demineralized water pipeline and the steam pipeline to monitor the steam-water flow rate.

[0017] As one implementation, the steam pipeline is also equipped with a regulating valve and a temperature and pressure monitoring device, and the steam pressure is controlled by the regulating valve.

[0018] A second aspect of the present invention provides an operation method for a low-parameter, wide-load, long-distance steam pipeline system.

[0019] An operation method for a low-parameter, wide-load long-distance steam pipeline system, comprising:

[0020] The demineralized water in the demineralized water tank is pumped to the steam generator.

[0021] The amount of demineralized water is controlled by regulating valves on the demineralized water pipeline, and the outlet pressure of the feed water pump and the amount of water entering the steam generator are monitored.

[0022] The heat from the low-temperature heat source is transferred to the demineralized water through a steam generator to heat the demineralized water and generate superheated steam. At the same time, the outlet steam parameters of the steam generator are monitored.

[0023] The outlet steam flow rate is regulated by the regulating valve on the steam pipeline, and the steam pressure is regulated as well. At the same time, the steam flow rate on the steam pipeline is monitored.

[0024] Based on the pipeline flow conditions and the pressure and temperature requirements of industrial steam users, the shut-off valves on the dual-pipeline long-distance steam pipeline are used to adjust the outlet steam parameters of the steam generator and match the corresponding operating mode of the dual-pipeline long-distance steam pipeline.

[0025] The beneficial effects of this invention are:

[0026] This invention establishes a dual-pipeline long-distance steam pipeline structure, with shut-off valves installed at both ends of each pipeline. The opening and closing of the corresponding shut-off valves are controlled according to the pipeline flow conditions and the pressure and temperature requirements of the industrial steam users. Furthermore, by adjusting the outlet steam parameters of the steam generator and matching the corresponding operating mode of the dual-pipeline long-distance steam pipeline, this invention achieves the full utilization of low-temperature heat source heat to generate low-parameter industrial steam, as well as the long-distance transportation and wide load fluctuation of industrial steam, ultimately meeting the needs of industrial users.

[0027] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a schematic diagram of a low-parameter, wide-load, long-distance steam pipeline system according to an embodiment of the present invention.

[0030] Among them, 1. Low-temperature heat source, 2. Steam generator, 3. Demineralized water tank, 4. Industrial steam user end, 5. Feed water pump A, 6. Feed water pump B, 7. Flow measurement device A, 8. Flow measurement device B, 9. Temperature monitoring device A, 10. Pressure monitoring device A, 11. Pressure monitoring device B, 12. Temperature monitoring device B, 13. Pressure monitoring device C, 14. Control valve A, 15. Control valve B, 16. Shut-off valve A, 17. Shut-off valve B, 18. Shut-off valve C, 19. Shut-off valve D, 20. Shut-off valve E, 21. Shut-off valve F, 22. Shut-off valve G, 23. Butterfly valve A, 24. Butterfly valve B, 25. Butterfly valve C, 26. Butterfly valve D, 27. Butterfly valve E, 28. Check valve A, 29. Check valve B. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Taking a certain low-temperature heat source as an example, the supply water temperature is 248℃, and the return water temperature is 188℃. Superheated steam at 230℃ can be generated through a steam generator. The industrial steam user is 15km away from the heat source pipeline. The industrial steam demand parameters are: pressure 0.7MPa, temperature 170℃, and the required steam flow rate for industrial production can be 100t / h, 130t / h, 160t / h, and 200t / h.

[0035] According to the software calculations, the flow rate requirements cannot be fully met for pipe diameters from DN700 to DN900. The "*" indicates that the steam is wet steam, which does not meet the user's requirements.

[0036] Table 1. Pipe diameters of DN700-DN900, outlet parameters of steam generators, and parameters at the user's location.

[0037]

[0038] To meet the three requirements of low parameters, wide load range, and long-distance transportation, the following references are made. Figure 1 This embodiment provides a low-parameter, wide-load, long-distance steam pipeline system.

[0039] In this embodiment, a low-parameter, wide-load, long-distance steam pipeline system includes: a demineralized water pipeline and a steam pipeline.

[0040] One end of the demineralized water pipeline is connected to the demineralized water tank 3, and the other end is connected to the inlet of the steam generator 2; wherein, the demineralized water entering the steam generator 2 is heated by the low-temperature heat source 1; one end of the steam pipeline is connected to the outlet of the steam generator 2, and the other end is connected to the industrial steam user terminal 4.

[0041] It should be noted that the low-temperature heat source 1 (such as low-temperature steam or hot water in heating nuclear small reactors, power plants or industrial production), steam generating device 2 and demineralized water tank 3 can all be implemented using existing structures by those skilled in the art, and will not be described in detail here.

[0042] In this embodiment, the steam pipeline includes a first steam connection pipeline, a second steam connection pipeline, and a dual-pipeline long-distance steam pipeline; the two ends of the dual-pipeline long-distance steam pipeline are respectively connected to the first steam connection pipeline and the second steam connection pipeline; wherein, the outlet steam parameters of the steam generator and the operating mode of the dual-pipeline long-distance steam pipeline are determined by the pipeline flow conditions and the pressure and temperature requirements of the industrial steam user.

[0043] Figure 1 In the process, butterfly valves B24 and C25 are installed at both ends of one branch of the dual-pipeline long-distance steam pipeline; butterfly valves D26 and E27 are installed at both ends of the other branch of the dual-pipeline long-distance steam pipeline.

[0044] In one or more embodiments, a flow measurement device A7 is installed on the demineralized water pipeline to monitor the steam water flow rate. A flow measurement device B8 is installed on the steam pipeline to monitor the steam water flow rate.

[0045] In some specific implementation processes, the steam pipeline is also equipped with a regulating valve and a temperature and pressure monitoring device, and the steam pressure is controlled by the regulating valve.

[0046] A pressure monitoring device B11 and a temperature monitoring device B12 are also installed between the dual-pipeline long-distance steam pipeline and the industrial steam user terminal 4.

[0047] Temperature monitoring device A9 and pressure monitoring device A10 are also installed at the outlet of steam generator 2.

[0048] On the steam pipeline between the outlet of the steam generator 2 and the flow measuring device B8, a butterfly valve A23 and a regulating valve B15 are also installed in sequence.

[0049] The demineralized water pipeline is also equipped with a pressure monitoring device C13. Between the pressure monitoring device C13 and the flow measurement device A7, a shut-off valve E20, a regulating valve A14 and a shut-off valve F21 are also installed in sequence. The pipeline branch where the shut-off valve E20, the regulating valve A14 and the shut-off valve F21 are located is also connected in parallel with the pipeline branch where the shut-off valve G is located.

[0050] In this embodiment, a parallel water supply pump, such as water supply pump A5 and water supply pump B6, is also provided at one end of the demineralized water pipeline connected to the demineralized water tank 3. Each of the water supply pumps is connected to a frequency converter. Water supply pump A5 and water supply pump B6 are respectively connected to frequency converters.

[0051] On the demineralized water pipeline where the water supply pump A5 is located, a shut-off valve A16 is connected in series between the water supply pump A5 and the demineralized water tank 3, and a check valve A28 and a shut-off valve B17 are connected in series at the other end of the water supply pump A5.

[0052] On the demineralized water pipeline where the feed water pump B6 is located, a shut-off valve C18 is connected in series between the feed water pump B6 and the demineralized water tank 3. A check valve B29 and a shut-off valve D19 are connected in series at the other end of the feed water pump B6.

[0053] It is understandable that the frequency conversion device can be implemented using other existing frequency conversion equipment such as frequency converters, which will not be elaborated here.

[0054] Specifically, the demineralized water in the demineralized water tank 3 is transported to the steam generator 2 via feed water pump A5 or feed water pump B6 (the two feed water pumps are backups for each other). The flow rate of the demineralized water is controlled by regulating valve A14. Pressure monitoring device 13 is used to monitor the outlet pressure of the feed water pump, and flow measurement device A7 is used to monitor the flow rate. The heat from the low-temperature heat source 1 is transferred to the demineralized water through the steam generator 2, heating the demineralized water to generate superheated steam. Temperature monitoring device A9 and pressure monitoring device A10 are installed on the steam pipeline at the outlet of the steam generator 2 to monitor steam parameters. Regulating valve B15 regulates the outlet steam flow rate and assists in regulating the steam pressure. Flow measurement device B8 is used to monitor the steam flow rate. The long-distance steam pipeline is equipped with two pipes, and butterfly valves are installed at the starting points of each pipe to adjust the pipeline operation. Pressure monitoring device B11 and temperature monitoring device B12 are installed on the steam header before the user.

[0055] In this embodiment, the operation modes of the dual-pipeline long-distance steam pipeline include single-pipeline operation mode and dual-pipeline operation mode.

[0056] The outlet steam parameters of the steam generator include outlet steam pressure and outlet steam temperature; wherein the outlet steam temperature is constant, and the outlet steam pressure is adjustable.

[0057] When the outlet steam pressure of the steam generator remains constant, a combination of single and double pipe operation is adopted.

[0058] Under the same pipe diameter, the operating mode M of a dual-pipeline long-distance steam pipeline 运行方式 Outlet steam pressure P 出 and outlet steam temperature T 出 These three factors are related to pipeline flow rate Q and industrial steam user-side pressure P. 用户 and industrial steam user-end temperature T 用户 The relation f is:

[0059] [M 运行方式 P 出 T 出 ]=f(Q,P 用户 T 用户 ).

[0060] It should be noted here that, under the same pipe diameter, the operating mode M of the dual-pipeline long-distance steam pipeline... 运行方式 Outlet steam pressure P出 and outlet steam temperature T 出 These three factors are related to pipeline flow rate Q and industrial steam user-side pressure P. 用户 and industrial steam user-end temperature T 用户 The relation f can be determined by using numerical simulation software to determine the dataset of relation f, and then by curve fitting.

[0061] Taking DN700 pipe diameter as an example, the following working conditions and operating modes can meet the needs of industrial steam users, as shown in Table 2.

[0062] Table 2 Operating conditions and modes for DN700 pipe diameter

[0063]

[0064] 1) Pressure regulation, single-pipe operation mode:

[0065] When the flow rate is 160t / h or 200t / h, the steam parameters at the outlet of the steam generator 2 are controlled at 1.6mpa and 230℃ by the feed water pump A 5 (or feed water pump B 6) and the regulating valve 15, which can meet the user's steam demand.

[0066] When the flow rate is 130t / h or 100t / h, the outlet pressure of the feed water pump is adjusted by the feed water pump frequency converter, and the outlet steam parameters of the steam generator 2 are controlled at 1.2mpa and 230℃ by the regulating valve 15, which can meet the user's steam demand.

[0067] 2) Fixed pressure, single / dual pipe combined operation mode:

[0068] The steam generator 2 outlet steam parameters are controlled by feedwater pump A 5 (or feedwater pump B 6) and regulating valve 15. When the steam flow rate is 160t / h or 200t / h, a dual-pipe operation mode is adopted. When the flow rate is 130t / h or 100t / h, a single-pipe operation mode is adopted, which can meet the user's steam demand.

[0069] The operating principle of the aforementioned low-parameter, wide-load, long-distance steam pipeline system is as follows:

[0070] The demineralized water in the demineralized water tank is pumped to the steam generator.

[0071] The amount of demineralized water is controlled by regulating valves on the demineralized water pipeline, and the outlet pressure of the feed water pump and the amount of water entering the steam generator are monitored.

[0072] The heat from the low-temperature heat source is transferred to the demineralized water through a steam generator to heat the demineralized water and generate superheated steam. At the same time, the outlet steam parameters of the steam generator are monitored.

[0073] The outlet steam flow rate is regulated by the regulating valve on the steam pipeline, and the steam pressure is regulated as well. At the same time, the steam flow rate on the steam pipeline is monitored.

[0074] Based on the pipeline flow conditions and the pressure and temperature requirements of industrial steam users, the shut-off valves on the dual-pipeline long-distance steam pipeline are used to adjust the outlet steam parameters of the steam generator and match the corresponding operating mode of the dual-pipeline long-distance steam pipeline.

[0075] This embodiment sets up a dual-pipeline long-distance steam pipeline structure, with shut-off valves installed at both ends of each pipeline. The opening and closing of the corresponding shut-off valves are controlled according to the pipeline flow conditions and the pressure and temperature requirements of the industrial steam users. By adjusting the outlet steam parameters of the steam generator and matching the corresponding operating mode of the dual-pipeline long-distance steam pipeline, the system fully utilizes the heat from the low-temperature heat source to generate low-parameter industrial steam, enabling long-distance transportation and wide load fluctuations of industrial steam, ultimately meeting the needs of industrial users.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A low-parameter, wide-load, long-distance steam pipeline system, characterized in that, include: Demineralized water pipelines and steam pipelines; One end of the demineralized water pipeline is connected to the demineralized water tank, and the other end is connected to the inlet of the steam generator; wherein, the demineralized water entering the steam generator is heated by a low-temperature heat source; one end of the steam pipeline is connected to the outlet of the steam generator, and the other end is connected to the industrial steam user end; The steam pipeline includes a first steam connection pipeline, a second steam connection pipeline, and a dual-pipeline long-distance steam pipeline; the two ends of the dual-pipeline long-distance steam pipeline are respectively connected to the first steam connection pipeline and the second steam connection pipeline; the outlet steam parameters of the steam generator and the operating mode of the dual-pipeline long-distance steam pipeline are determined by the pipeline flow conditions and the pressure and temperature requirements of the industrial steam user. The operation modes of the dual-pipeline long-distance steam pipeline include single-pipeline operation mode and dual-pipeline operation mode; The outlet steam parameters of the steam generator include outlet steam pressure and outlet steam temperature; wherein, the outlet steam temperature is constant, while the outlet steam pressure is adjustable. When the outlet steam pressure of the steam generator remains constant, a single-pipe / dual-pipe combined operation mode is adopted. Under the same pipe diameter, the operating mode M of a dual-pipeline long-distance steam pipeline 运行方式 Outlet steam pressure P 出 and outlet steam temperature T 出 These three factors are related to pipeline flow rate Q and industrial steam user-side pressure P. 用户 and industrial steam user-end temperature T 用户 The relation f is: [M 运行方式 ,P 出 ,T 出 ]=f(Q,P 用户 ,T 用户 ); A parallel water pump is also installed at one end of the demineralized water pipeline connected to the demineralized water tank; The demineralized water in the demineralized water tank is pumped to the steam generator. The amount of demineralized water is controlled by the regulating valve. The pressure monitoring device monitors the outlet pressure of the feed water pump, and the flow measurement device monitors the water volume. The heat from the low-temperature heat source is transferred to the demineralized water through a steam generator, heating the demineralized water to generate superheated steam; temperature and pressure monitoring devices are installed on the steam pipeline at the outlet of the steam generator to monitor steam parameters; long The steam pipeline is equipped with two pipes, each with a butterfly valve at its starting point to regulate pipeline operation.

2. The low-parameter, wide-load, long-distance steam pipeline system as described in claim 1, characterized in that, Under the same pipe diameter, numerical simulation was used to determine the relationship between the operating mode, outlet steam pressure, and outlet steam temperature of the dual-pipeline long-distance steam pipeline and the pipeline flow rate, industrial steam user end pressure, and industrial steam user end temperature.

3. The low-parameter, wide-load, long-distance steam pipeline system as described in claim 1, characterized in that, Each of the water pumps is connected to a frequency converter.

4. The low-parameter, wide-load, long-distance steam pipeline system as described in claim 1, characterized in that, Both the demineralized water pipeline and the steam pipeline are equipped with flow measurement devices to monitor the steam-water flow rate.

5. The low-parameter, wide-load, long-distance steam pipeline system as described in claim 1, characterized in that, The steam pipeline is also equipped with a regulating valve and a temperature and pressure monitoring device, and the steam pressure is controlled by the regulating valve.

6. An operation method for a low-parameter, wide-load long-distance steam pipeline system as described in any one of claims 1-5, characterized in that, include: The demineralized water in the demineralized water tank is pumped to the steam generator. The amount of demineralized water is controlled by regulating valves on the demineralized water pipeline, and the outlet pressure of the feed water pump and the amount of water entering the steam generator are monitored. The heat from the low-temperature heat source is transferred to the demineralized water through a steam generator to heat the demineralized water and generate superheated steam. At the same time, the outlet steam parameters of the steam generator are monitored. The outlet steam flow rate is regulated by the regulating valve on the steam pipeline, and the steam pressure is regulated as well. At the same time, the steam flow rate on the steam pipeline is monitored. Based on the pipeline flow conditions and the pressure and temperature requirements of industrial steam users, the shut-off valves on the dual-pipeline long-distance steam pipeline are used to adjust the outlet steam parameters of the steam generator and match the corresponding operating mode of the dual-pipeline long-distance steam pipeline.

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