Long-distance steam conveying heat supply system

Abstract

The invention relates to a long-distance steam conveying heat supply system which comprises a long-distance steam conveying pipeline, a power parameter adaptation station and a plurality of tail end steam pipelines, and the long-distance steam conveying pipeline is used for conveying high-pressure steam in a steam heat source plant to the power parameter adaptation station; the power parameter adaptation station is used for adjusting the high-pressure steam conveyed by the long-distance steam conveying pipeline into steam of different pressure grades according to the steam using requirements of users in the area; and the tail end steam pipelines are respectively used for conveying the steam of the corresponding pressure grade to the corresponding users in the area. According to the long-distance steam heat supply system, the comprehensive construction investment of a project is low under the condition that the steam using requirements of different user parameters in a load area are met.

Description

Technical Field

[0001] The invention belongs to the technical field of steam heating systems, and in particular relates to a long-distance steam heating system. Background Art

[0002] With the continuous development of national industrial agglomeration and economies of scale, the demand for steam from various industrial or industrial park production enterprises is increasing. In addition, with the continuous upgrading of national low-carbon and environmental protection requirements, cogeneration units with industrial and production heat loads as the main features have the advantages of high comprehensive energy utilization efficiency, energy saving and environmental protection. However, due to the relatively long distance between some production enterprises and thermal power plants, a large number of large-diameter and long-distance steam heating pipelines of 15km to 20km or even longer have appeared in recent years, exceeding the steam heating radius stipulated in the heat network specifications (generally no more than 5km to 8km).

[0003] For steam heat loads of industrial and manufacturing enterprises, the steam parameters required are different according to their different process flows and heat requirements, and can usually be simply divided into high-pressure, medium-pressure and low-pressure steam loads. In addition, the steam temperature is also an important factor affecting the planning and construction of steam transmission and heating systems. In order to meet the steam demand of different users mentioned above, the existing technology generally adopts two steam heating systems: multi-pipe steam heating system and single-pipe steam heating system with user-side pressure regulation for adaptive steam supply.

[0004] The principle of the multi-pipe steam heating system is: according to the different steam parameters of steam users in the load area, two or more steam pipelines with different parameter levels are planned and constructed for steam supply, and the steam parameter adjustment is mainly set up in the steam heat source plant. Figure 1 The multi-pipe steam heating system shown in the figure, Figure 1 The steam users in this area include high-pressure steam users 21, medium-pressure steam users 31 and low-pressure steam users 41. Correspondingly, high-pressure steam pipelines 2, medium-pressure steam pipelines 3 and low-pressure steam pipelines 4 are planned. The steam in the steam heat source plant 1 is transported to users with corresponding steam application parameters through each steam pipeline.

[0005] For example Figure 1 The multi-pipe steam heating system shown can better meet the steam demand of users with different parameters in the load area. However, the biggest disadvantage of this steam heating system is that the project construction investment is high, especially for long-distance steam heating systems, the construction cost of the pipeline accounts for a large proportion of the entire project investment, and has the disadvantage of poor economic benefits.

[0006] The principle of the steam heating system with single-pipe and user-side pressure regulation is as follows: according to the different steam parameters of production enterprises in the load area, the long-distance steam supply parameters are determined after comprehensive technical and economic comparison. The long-distance steam supply parameters are usually higher than the steam parameters of the highest user in the load area. Then a high-pressure steam pipeline is planned and constructed to supply steam to the load area. Medium and low-pressure steam users in the load area can adapt the parameters for heating by setting temperature and pressure reduction devices at the user end. For example, Figure 2 In the single-pipe steam heating system with user-side pressure regulation shown, the steam in the steam heat source plant 1 is transported to each user (high-pressure steam user 21, medium-pressure steam user 31 and low-pressure steam user 41) through the high-pressure steam pipeline 2. Each user obtains steam with corresponding parameters through temperature and pressure reduction devices according to its own steam usage parameters.

[0007] For example Figure 2 The steam heating system with a single pipe and user-side pressure regulation shown in the figure can theoretically meet the steam demand of users with different parameters in the load area, and the construction investment of the project is low compared with the multi-pipe steam heating system. However, in actual application, due to the uneven technical management level of production steam enterprises and the pressure fluctuations caused by the load size during the actual operation of the steam pipeline, the parameter selection of the enterprise's temperature reduction and pressure reduction device deviates from the actual operating conditions, and the steam parameters after temperature reduction and pressure reduction cannot meet the use requirements.

[0008] In addition, for the condensate recovery systems of the above two steam heating systems, there is a situation where user companies select pumps independently. This situation will cause large fluctuations in the operating pressure of the condensate pipeline, which may cause the condensate of some user companies to be unable to return to the heat source, and even affect the production safety of the heat source plant. Summary of the invention

[0009] In order to solve all or part of the above problems, the purpose of the present invention is to provide a long-distance steam heating system. The long-distance steam heating system of the present invention has a low comprehensive construction investment while meeting the steam demand of different user parameters in the load area.

[0010] According to one aspect of the present invention, a long-distance steam heating system is provided, comprising a long-distance steam pipeline, a power parameter adaptation station and a plurality of terminal steam pipelines, wherein:

[0011] The long-distance steam pipeline is used to transport high-pressure steam in the steam heat source plant to the power parameter adaptation station;

[0012] The power parameter adaptation station is used to adjust the high-pressure steam transported by the long-distance steam pipeline into steam of different pressure levels according to the steam demand of users in the area;

[0013] The terminal steam pipelines are respectively used to transport steam of corresponding pressure levels to corresponding users in the area.

[0014] Furthermore, a steam separation unit is provided in the power parameter adaptation station, the inlet end of the steam separation unit is connected to the long-distance steam pipeline, and the outlet end of the steam separation unit is respectively connected to the corresponding terminal steam pipelines, and the steam separation unit is used to separate the high-pressure steam transported by the long-distance steam pipeline into different routes and transport it to the corresponding terminal steam pipelines;

[0015] The power parameter adaptation station is also provided with a steam pressure regulating device, which is arranged on each of the terminal steam pipes. The steam pressure regulating device is used to regulate the steam in the terminal steam pipe where it is located to a corresponding pressure level.

[0016] Furthermore, the steam pressure regulating device includes a steam boosting device and / or a temperature and pressure reduction device, and each of the terminal steam pipes is respectively provided with the steam boosting device or the temperature and pressure reduction device. The steam boosting device is used to increase the pressure of the steam in the terminal steam pipe where it is located, and the temperature and pressure reduction device is used to reduce the pressure of the steam in the terminal steam pipe where it is located.

[0017] Furthermore, the steam separation unit is a steam separation cylinder, the inlet end of the steam separation cylinder is connected to the long-distance steam pipeline, and the outlet end of the steam separation cylinder is connected to the corresponding terminal steam pipeline.

[0018] Furthermore, a condensate recovery system is provided in the power parameter adaptation station, and the condensate recovery system is used to recover the user's steam condensate and send it back to the steam heat source plant.

[0019] Furthermore, the condensate recovery system includes a recovery unit, a water treatment unit, a water quality detection unit and a transportation unit. The recovery unit is used to recover the user's steam condensate, the water treatment unit is used to process the recovered steam condensate, the water quality detection unit is used to detect the water quality of the condensate before and after treatment by the water treatment unit, and the transportation unit is used to transport the condensate that has passed the inspection by the water quality detection unit to the steam heat source plant.

[0020] Furthermore, a steam generating device is provided in the power parameter adaptation station, and the steam generating device is used to generate steam. The steam generated by the steam generating device is used for supplementary steam supply or emergency standby.

[0021] Furthermore, the steam generating device is a steam boiler or a steam generator.

[0022] Furthermore, the long-distance steam pipeline adopts a single-pipe pipeline system.

[0023] Furthermore, the long-distance steam pipeline may also adopt a multi-pipe pipeline system.

[0024] It can be seen from the above technical solution that the long-distance steam heating system provided by the present invention has the following beneficial effects:

[0025] The long-distance steam heating system of the present invention is a combination of the existing multi-pipe steam heating system and the single-pipe steam heating system with user-side pressure regulation. It has the advantages of the multi-pipe steam heating system and the single-pipe steam heating system with user-side pressure regulation. While meeting the steam demand of different user parameters in the load area, the comprehensive construction investment of the project is relatively low.

[0026] The configuration of the condensate recovery system of the present invention enables stable operation of steam condensate recovery, overcoming the problem in the prior art that the operating pressure of the condensate pipeline fluctuates greatly due to users independently selecting pumps, and even the condensate cannot be returned to the heat source, affecting the production safety of the heat source plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the principle of a multi-pipe steam heating system in the prior art;

[0028] Figure 2 It is a schematic diagram of the principle of a steam heating system with a single pipe and pressure regulation at the user end in the prior art;

[0029] Figure 3 A schematic diagram of a long-distance steam heating system according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a power parameter adaptation station according to an embodiment of the present invention;

[0031] The reference numerals in the figure are: steam heat source plant 1, high-pressure steam pipeline 2, high-pressure steam user 21, medium-pressure steam pipeline 3, medium-pressure steam user 31, low-pressure steam pipeline 4, low-pressure steam user 41, long-distance steam pipeline 5, power parameter adaptation station 6, steam cylinder 61, steam booster 62, temperature and pressure reduction device 63, condensate recovery system 64, steam generating device 65, terminal steam pipeline 7. DETAILED DESCRIPTION

[0032] In order to better understand the purpose, structure and function of the present invention, a long-distance steam heating system of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] like Figure 3As shown, it shows a long-distance steam heating system of an embodiment of the present invention, including a long-distance steam pipeline 5, a power parameter adaptation station 6 and a plurality of terminal steam pipelines 7, wherein: the long-distance steam pipeline 5 is used to transport the high-pressure steam in the steam heat source plant 1 to the power parameter adaptation station 6; the power parameter adaptation station 6 is used to adjust the high-pressure steam transported by the long-distance steam pipeline 5 to steam of different pressure levels according to the steam demand of users in the area; the terminal steam pipelines 7 are respectively used to transport steam of corresponding pressure levels to corresponding users in the area.

[0034] The long-distance steam heating system of the embodiment of the present invention is a combination of the existing multi-pipe steam heating system and the single-pipe steam heating system with user-end pressure regulation. Specifically, the long-distance steam heating system of the embodiment of the present invention uses a long-distance steam pipeline 5 to transport the steam in the steam heat source plant 1 far away from the heat load area to the power parameter adaptation station 6. The power parameter adaptation station 6 adjusts the high-pressure steam transported by the long-distance steam pipeline 5 to steam of different pressure levels according to the different steam usage parameters of the production enterprises in the load area, and finally uses the multi-pipe steam heating system to supply steam to the area.

[0035] The long-distance steam heating system of the embodiment of the present invention can not only meet the steam parameter requirements of different users in the load area, but also reduce the construction cost of the long-distance steam pipeline 5 compared with the multi-pipe steam heating system.

[0036] Specifically, the long-distance steam pipeline 5 of the embodiment of the present invention is used to transport the high-pressure steam in the steam heat source plant 1 to the power parameter adaptation station 6. In specific implementation, the parameter formulation of the long-distance steam pipeline 5 needs to be determined after comprehensive technical and economic comparison based on the different steam parameters of users in the load area and the steam parameters of the heat source plant. In addition, the long-distance steam pipeline 5 usually adopts a single pipe control, thereby reducing the cost of laying the pipeline. Secondly, considering the large load changes on the user side and the inability of a single pipe flow to meet the user's steam demand, the long-distance steam pipeline 5 can also adopt multi-pipe control. The pipe diameter of the long-distance steam pipeline 5 needs to be determined by comparing multiple schemes based on the specific project.

[0037] Among them, the power parameter adaptation station 6 is the core of the long-distance steam heating system of the embodiment of the present invention. Its main function is to adjust the pressure and temperature of the long-distance steam by setting different parameters of the cooling and pressure reducing devices 63 and the steam boosting devices 62 in a graded and centralized manner according to the different steam parameter requirements of the production enterprises in the load area, so as to meet the steam requirements of users in the area.

[0038] Specifically, in one embodiment, Figure 4As shown, a steam separation unit is provided in the power parameter adaptation station 6, the inlet end of the steam separation unit is connected to the long-distance steam pipeline 5, and the outlet end of the steam separation unit is respectively connected to the corresponding terminal steam pipelines 7. The steam separation unit is used to divide the high-pressure steam transported by the long-distance steam pipeline 5 into different routes and transport it to the corresponding terminal steam pipelines 7.

[0039] by Figure 3 For example, the terminal steam pipeline 7 includes a high-pressure steam pipeline 2, a medium-pressure steam pipeline 3 and a low-pressure steam pipeline 4. The steam separation unit is used to divide the high-pressure steam transported by the long-distance steam pipeline 5 into several routes and transport them to the corresponding high-pressure steam pipeline 2, medium-pressure steam pipeline 3 and low-pressure steam pipeline 4. Figure 4 For example, Figure 4 The middle steam splitting unit is a steam splitting cylinder 61, the inlet end of the steam splitting cylinder 61 is connected to the long-distance steam pipeline 5, and the outlet end of the steam splitting cylinder 61 is connected to the corresponding terminal steam pipeline 7. The steam splitting cylinder 61 splits the high-pressure steam transported by the long-distance steam pipeline 5 into 4 routes and transports them to the corresponding terminal steam pipelines 7.

[0040] like Figure 4 As shown, a steam pressure regulating device is also provided in the power parameter adaptation station 6. The steam pressure regulating device is provided on each terminal steam pipe 7. The steam pressure regulating device is used to regulate the steam in the terminal steam pipe 7 where it is located to a corresponding pressure level.

[0041] In specific implementation, the steam pressure regulating device includes a steam booster 62 and / or a temperature and pressure reduction device 63. Each terminal steam pipe 7 is respectively provided with a steam booster 62 or a temperature and pressure reduction device 63. The steam booster 62 is used to increase the pressure of the steam in the terminal steam pipe 7 where it is located, and the temperature and pressure reduction device 63 is used to reduce the pressure of the steam in the terminal steam pipe 7 where it is located.

[0042] Again Figure 4 For example, Figure 4 The middle and terminal steam pipelines 7 are composed of several routes, which are respectively used to transport ultra-high pressure steam, high pressure steam, medium pressure steam and low pressure steam, while the long-distance steam pipeline 5 transports high pressure steam; therefore, the terminal steam pipeline 7 used to transport ultra-high pressure steam is provided with a steam booster 62, and the steam booster 62 is used to boost the high pressure steam into ultra-high pressure steam; the terminal steam pipeline 7 used to transport medium pressure steam is provided with a temperature reduction and pressure reduction device 63, and the temperature reduction and pressure reduction device 63 is used to reduce the pressure of high pressure steam into medium pressure steam; the terminal steam pipeline 7 used to transport low pressure steam is provided with a temperature reduction and pressure reduction device 63, and the temperature reduction and pressure reduction device 63 is used to reduce the pressure of high pressure steam into low pressure steam.

[0043] The steam pressure regulating device of this embodiment is arranged in the power parameter adaptation station 6, so there is no need for each steam user to adjust it by themselves, which overcomes the problem in the prior art that the steam parameters obtained by the user after adjusting through the temperature reduction and pressure reduction device 63 cannot meet the use requirements.

[0044] In one embodiment, if Figure 4 As shown, a condensate recovery system 64 is provided in the power parameter adaptation station 6 , and the condensate recovery system 64 is used to recover the user's steam condensate and send it back to the steam heat source plant 1 .

[0045] The condensate recovery system 64 of this embodiment is used to recover the steam condensate of the user, so as to ensure the stable operation of the steam condensate recovery, thus overcoming the problem in the prior art that the operating pressure of the condensate pipeline fluctuates greatly due to the independent pump selection by each user, and even the condensate cannot be returned to the heat source.

[0046] Among them, the condensate recovery system 64 includes a recovery unit, a water treatment unit, a water quality detection unit and a transportation unit. The recovery unit is used to recover the user's steam condensate, the water treatment unit is used to treat the recovered steam condensate, the water quality detection unit is used to detect the water quality of the condensate before and after treatment by the water treatment unit, and the transportation unit is used to transport the condensate that has passed the inspection of the water quality detection unit to the steam heat source plant 1.

[0047] The setting of the condensate recovery system 64 of this embodiment ensures the water quality of the condensate returned to the steam heat source plant 1. When the water quality of the steam condensate does not meet the requirements of the power plant, the water treatment unit will treat it. The steam condensate after the water quality treatment is qualified can be returned to the steam heat source plant 1.

[0048] In one embodiment, if Figure 4 As shown, a steam generating device 65 is provided in the power parameter adaptation station 6, and the steam generating device 65 is used to generate steam. The steam generated by the steam generating device 65 is used for supplementary steam supply or emergency standby.

[0049] The steam generating device 65 of this embodiment is used to supplement the supply of steam, thereby solving the problem that the steam processed by the steam boosting device 62 or the temperature and pressure reducing device 63 cannot meet the steam parameters of some users in the load area; and the setting of the steam generating device 65 can also increase the peak load regulation or accident emergency guarantee capability of the system. In specific implementation, the steam generating device 65 is, for example, a steam boiler or a steam generator.

[0050] Again, if Figure 4 As shown, the aforementioned condensate recovery system 64 for recovering the user's steam condensate can also be used as a water source for the steam generating device 65 of this embodiment.

[0051] Finally, the terminal steam pipeline 7 is used to deliver the steam processed by the steam pressure regulating device to the user. In specific implementation, two or more terminal steam pipelines 7 with different parameter levels are planned and constructed according to different steam parameters of users in the load area for steam supply.

[0052] To sum up, the long-distance steam heating system in the embodiment of the present invention is a combination of the existing multi-pipe steam heating system and the single-pipe steam heating system with household-end pressure regulation. It has the advantages of the multi-pipe steam heating system and the single-pipe steam heating system with household-end pressure regulation. While meeting the steam demand requirements of different user parameters in the load area, the comprehensive construction investment of the project is relatively low.

[0053] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0054] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A long-distance steam heating system, characterized in that: It includes long-distance steam pipelines, power parameter adaptation stations and several terminal steam pipelines, including: The long-distance steam pipeline is used to transport high-pressure steam in the steam heat source plant to the power parameter adaptation station; The power parameter adaptation station is used to adjust the high-pressure steam transported by the long-distance steam pipeline into steam of different pressure levels according to the steam demand of users in the area; The terminal steam pipelines are respectively used to transport steam of corresponding pressure levels to corresponding users in the area.

2. The long-distance steam heating system according to claim 1, characterized in that: The power parameter adaptation station is provided with a steam separation unit, the inlet end of the steam separation unit is connected to the long-distance steam pipeline, and the outlet end of the steam separation unit is respectively connected to the corresponding terminal steam pipelines, and the steam separation unit is used to separate the high-pressure steam transported by the long-distance steam pipeline into different routes and transport them to the corresponding terminal steam pipelines; The power parameter adaptation station is also provided with a steam pressure regulating device, which is arranged on each of the terminal steam pipes. The steam pressure regulating device is used to regulate the steam in the terminal steam pipe where it is located to a corresponding pressure level.

3. The long-distance steam heating system according to claim 2, characterized in that: The steam pressure regulating device includes a steam boosting device and / or a temperature and pressure reduction device. Each of the terminal steam pipes is respectively provided with the steam boosting device or the temperature and pressure reduction device. The steam boosting device is used to increase the pressure of the steam in the terminal steam pipe where it is located, and the temperature and pressure reduction device is used to reduce the pressure of the steam in the terminal steam pipe where it is located.

4. The long-distance steam heating system according to claim 2, characterized in that: The steam separation unit is a steam separation cylinder, the inlet end of the steam separation cylinder is connected to the long-distance steam pipeline, and the outlet end of the steam separation cylinder is connected to the corresponding terminal steam pipeline.

5. The long-distance steam heating system according to claim 1, characterized in that: The power parameter adaptation station is provided with a condensate recovery system, which is used to recover the user's steam condensate and send it back to the steam heat source plant.

6. The long-distance steam heating system according to claim 5, characterized in that: The condensate recovery system includes a recovery unit, a water treatment unit, a water quality detection unit and a transportation unit. The recovery unit is used to recover the user's steam condensate. The water treatment unit is used to treat the recovered steam condensate. The water quality detection unit is used to detect the water quality of the condensate before and after treatment by the water treatment unit. The transportation unit is used to transport the condensate that has passed the inspection of the water quality detection unit to the steam heat source plant.

7. The long-distance steam heating system according to claim 1, characterized in that: The power parameter adaptation station is provided with a steam generating device, which is used to generate steam. The steam generated by the steam generating device is used for supplementary steam supply or emergency standby.

8. The long-distance steam heating system according to claim 7, characterized in that: The steam generating device is a steam boiler or a steam generator.

9. The long-distance steam heating system according to any one of claims 1 to 8, characterized in that: The long-distance steam pipeline adopts a single-pipe pipeline system.

10. The long-distance steam heating system according to any one of claims 1 to 8, characterized in that: The long-distance steam pipeline adopts a multi-pipe pipeline system.

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