Steam heat supply system

Abstract

The invention belongs to the technical field of steam heat supply, and relates to a steam heat supply system. The steam heat supply system comprises a power plant low-pressure steam heat supply pipeline, a power plant medium-pressure steam heat supply pipeline, a first medium-pressure heat supply regulating valve group, a second medium-pressure heat supply regulating valve group, a first low-pressure heat supply regulating valve group, a second low-pressure heat supply regulating valve group, a first medium-pressure heat supply steam pipeline and a second medium-pressure heat supply steam pipeline. Petrochemical medium-pressure steam loading and petrochemical low-pressure steam loading. According to the method for conveying the low-pressure steam through the standby medium-pressure heat supply steam pipeline, the situation that the standby pipeline is in a nearly idle state of warm pipe hot standby is eliminated, the pipeline investment is reduced, and the pipeline utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam heating, in particular to a steam heating system. BACKGROUND

[0002] The safety of the heating system is highly required in petrochemical enterprises, and a one-use-one-backup configuration is generally required. According to different users, steam is divided into two types of medium pressure and low pressure, wherein the medium pressure steam parameters are 4.0 MPa (g) and 400 DEG C, and the low pressure steam is 1.2 MPa (g) and 300 DEG C.

[0003] According to the safety requirement, it means that the petrochemical enterprise needs to configure at least two medium pressure heating steam pipelines and two low pressure heating steam pipelines, but only one medium pressure heating steam pipeline and one low pressure heating steam pipeline are in the running state during normal operation; the standby pipeline is in the warm pipeline standby state, causing the idling of the pipeline and the waste of steam. SUMMARY

[0004] In order to solve the above problems, a steam heating system is disclosed in the present application, and the technical scheme of the present application is implemented as follows:

[0005] A heating steam system, comprising a power plant low pressure steam heating pipeline, a power plant medium pressure steam heating pipeline, a first medium pressure heating regulating valve group, a second medium pressure heating regulating valve group, a first low pressure heating regulating valve group, a second low pressure heating regulating valve group, a first medium pressure heating steam pipeline, a second medium pressure heating steam pipeline, a petrochemical medium pressure steam load and a petrochemical low pressure steam load;

[0006] The power plant medium pressure steam heating pipeline is connected to the first medium pressure heating steam pipeline through a first medium pressure steam branch pipe, and the first medium pressure heating regulating valve group is arranged on the first medium pressure steam branch pipe;

[0007] The power plant medium pressure steam heating pipeline is connected to the second medium pressure heating steam pipeline through a second medium pressure steam branch pipe, and the second medium pressure heating regulating valve group is arranged on the second medium pressure steam branch pipe;

[0008] The power plant low pressure steam heating pipeline is connected to the first medium pressure heating steam pipeline through a first low pressure steam branch pipe, and the first low pressure heating regulating valve group is arranged on the first low pressure steam branch pipe;

[0009] The power plant low pressure steam heating pipeline is connected to the second medium pressure heating steam pipeline through a second low pressure steam branch pipe, and the second low pressure heating regulating valve group is arranged on the second low pressure steam branch pipe;

[0010] The first pressure reducing regulating valve group connects the first medium pressure heating steam pipeline and the petrochemical medium pressure steam load, and the second pressure reducing regulating valve group connects the second medium pressure heating steam pipeline and the petrochemical medium pressure steam load;

[0011] The first pressure reducing regulating valve group and the second pressure reducing regulating valve group are connected in parallel;

[0012] The petrochemical medium pressure steam load is connected to the first medium pressure heating steam pipeline through a first petrochemical medium pressure steam branch, and the petrochemical medium pressure steam load is connected to the second medium pressure heating steam pipeline through a second petrochemical medium pressure steam branch,

[0013] The petrochemical low pressure steam load is connected to the first medium pressure heating steam pipeline through a first petrochemical low pressure steam branch, and the petrochemical low pressure steam load is connected to the second medium pressure heating steam pipeline through a second petrochemical low pressure steam branch.

[0014] Preferably, the first medium pressure heating regulating valve group comprises a first medium pressure heating regulating valve inlet door, a first medium pressure heating regulating valve, and a first medium pressure heating regulating valve outlet door;

[0015] The first medium pressure heating regulating valve group comprises a second medium pressure heating regulating valve inlet door, a second medium pressure heating regulating valve, and a second medium pressure heating regulating valve outlet door;

[0016] The first low pressure heating regulating valve group comprises a first low pressure heating regulating valve inlet door, a first low pressure heating regulating valve, and a first low pressure heating regulating valve outlet door;

[0017] The first low pressure heating regulating valve group comprises a second low pressure heating regulating valve inlet door, a second low pressure heating regulating valve, and a second low pressure heating regulating valve outlet door;

[0018] Preferably, the first pressure reducing regulating valve group comprises a first pressure reducing valve inlet door, a first pressure reducing valve, and a first pressure reducing valve outlet door;

[0019] The second pressure reducing regulating valve group comprises a second pressure reducing valve inlet door, a second pressure reducing valve, and a second pressure reducing valve outlet door.

[0020] The advantages of the present application are as follows:

[0021] 1. The pipeline investment is saved, and the corresponding pipeline, pipe fitting, support and hanger, and heat preservation procurement and construction cost are reduced by reducing two low pressure heating steam pipelines.

[0022] 2. The space required for pipeline arrangement is saved, and the space requirement for pipeline arrangement is reduced by reducing two low pressure heating steam pipelines.

[0023] 3. The operation and maintenance cost of the pipeline is reduced, one aspect is to reduce the pipeline warm-up cost of keeping in hot standby state, another aspect is to reduce the pipeline maintenance and repair cost; BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structure diagram of the steam heating system of the conventional technology;

[0026] Figure 2 The structure diagram of the steam heating system of the present application;

[0027] The symbols in the above drawings have the following meanings:

[0028] 1. First medium-pressure heating steam pipeline;

[0029] 2. Second medium-pressure heating steam pipeline;

[0030] 3. First low-pressure heating steam pipeline;

[0031] 4. Second low-pressure heating steam pipeline;

[0032] 5. First medium-pressure heating regulating valve inlet door;

[0033] 6. First medium-pressure heating regulating valve;

[0034] 7. First medium-pressure heating regulating valve outlet door;

[0035] 8. Second medium-pressure heating regulating valve inlet door;

[0036] 9. Second medium-pressure heating regulating valve;

[0037] 10. Second medium-pressure heating regulating valve outlet door;

[0038] 11. First low-pressure heating regulating valve inlet door;

[0039] 12. First low-pressure heating regulating valve;

[0040] 13. First low-pressure heating regulating valve outlet door;

[0041] 14. Second low-pressure heating regulating valve inlet door;

[0042] 15. Second low-pressure heating regulating valve;

[0043] 16. Second low-pressure heating regulating valve outlet valve;

[0044] 17. First medium-pressure heating supply to the main medium-pressure user valve;

[0045] 18. Second medium-pressure heating supply to the main medium-pressure user valve;

[0046] 19. First low-pressure heating to low-pressure user main valve;

[0047] 20, Second low-pressure heating to low-pressure user main valve;

[0048] 21, First pressure reducing valve inlet gate;

[0049] 22, First pressure reducing valve;

[0050] 23, First pressure reducing valve outlet gate;

[0051] 24, Second pressure reducing valve inlet gate;

[0052] 25, Second pressure reducing valve;

[0053] 26, Second pressure reducing valve outlet gate. Detailed Implementation

[0054] The embodiments of the present invention will be described in more detail below with reference to the examples and accompanying drawings. It should be noted that the embodiments of the present invention are not limited to these examples.

[0055] Example: A heating steam system, such as Figure 2 As shown, the system includes a power plant low-pressure steam heating pipeline, a power plant medium-pressure steam heating pipeline, a first medium-pressure heating regulating valve group, a second medium-pressure heating regulating valve group, a first low-pressure heating regulating valve group, a second low-pressure heating regulating valve group, a first medium-pressure heating steam pipeline 1, a second medium-pressure heating steam pipeline 2, a petrochemical medium-pressure steam load, and a petrochemical low-pressure steam load. In this embodiment, the petrochemical medium-pressure steam load refers to the petrochemical medium-pressure steam user, and the petrochemical low-pressure steam load refers to the petrochemical low-pressure steam user.

[0056] The power plant's medium-pressure steam heating pipeline is connected to the first medium-pressure heating steam pipeline 1 via the first medium-pressure steam branch pipe, and the first medium-pressure heating regulating valve group is installed on the first medium-pressure steam branch pipe.

[0057] The power plant's medium-pressure steam heating pipeline is connected to the second medium-pressure heating steam pipeline 2 via a second medium-pressure steam branch pipe, and the second medium-pressure heating regulating valve group is installed on the second medium-pressure steam branch pipe.

[0058] The power plant's low-pressure steam heating pipeline is connected to the first medium-pressure heating steam pipeline 1 via the first low-pressure steam branch pipe, and the first low-pressure heating regulating valve group is installed on the first low-pressure steam branch pipe.

[0059] The power plant low-pressure steam heating pipeline is connected with the second medium-pressure heating steam pipeline 2 through a second low-pressure steam branch pipe, and a second low-pressure heating regulating valve group is arranged on the second low-pressure steam branch pipe.

[0060] The first pressure-reducing regulating valve group is connected with the first medium-pressure heating steam pipeline 1 and the petrochemical low-pressure steam load, and the second pressure-reducing regulating valve group is connected with the second medium-pressure heating steam pipeline 2 and the petrochemical low-pressure steam load.

[0061] The first pressure-reducing regulating valve group and the second pressure-reducing regulating valve group are connected in parallel.

[0062] The petrochemical medium-pressure steam load is connected with the first medium-pressure heating steam pipeline 1 through a first petrochemical medium-pressure steam branch, and the petrochemical medium-pressure steam load is connected with the second medium-pressure heating steam pipeline 2 through a second petrochemical medium-pressure steam branch,

[0063] The petrochemical low-pressure steam load is connected with the first medium-pressure heating steam pipeline 1 through a first petrochemical low-pressure steam branch, and the petrochemical low-pressure steam load is connected with the second medium-pressure heating steam pipeline 2 through a second petrochemical low-pressure steam branch.

[0064] In the embodiment, the first medium-pressure heating regulating valve group comprises a first medium-pressure heating regulating valve inlet door 5, a first medium-pressure heating regulating valve 6 and a first medium-pressure heating regulating valve outlet door 7.

[0065] The second medium-pressure heating regulating valve group comprises a second medium-pressure heating regulating valve inlet door 8, a second medium-pressure heating regulating valve 9 and a second medium-pressure heating regulating valve outlet door 10.

[0066] The first low-pressure heating regulating valve group comprises a first low-pressure heating regulating valve inlet door 11, a first low-pressure heating regulating valve 12 and a first low-pressure heating regulating valve outlet door 13.

[0067] The second low-pressure heating regulating valve group comprises a second low-pressure heating regulating valve inlet door 14, a second low-pressure heating regulating valve 15 and a second low-pressure heating regulating valve outlet door 16.

[0068] In the embodiment, the first pressure-reducing regulating valve group comprises a first pressure-reducing valve inlet door 21, a first pressure-reducing valve 22 and a first pressure-reducing valve outlet door 23.

[0069] The second pressure-reducing regulating valve group comprises a second pressure-reducing valve inlet door 24, a second pressure-reducing valve 25 and a second pressure-reducing valve outlet door 26.

[0070] In the embodiment, according to the pressure drop requirement, pressure and temperature parameters of the medium-pressure heating steam (the total amount is the sum of the medium-pressure and low-pressure steam) and the low-pressure steam, the required diameters of the pipelines are calculated respectively, the larger one of the two is taken as the design diameter of the medium-pressure heating pipeline, and the wall thickness of the pipeline is selected according to the pressure and temperature of the medium-pressure heating steam, so that the medium-pressure heating steam pipeline selected in this way can meet the requirements of the medium-pressure heating steam and the low-pressure heating steam.

[0071] In normal operation, the medium pressure heating steam in the medium pressure steam heating pipeline in the power plant can be supplied to the first medium pressure heating steam pipeline 1 through the first medium pressure heating regulating valve inlet door 5, the first medium pressure heating regulating valve 6, the first medium pressure heating regulating valve outlet door 7 on the first medium pressure steam branch pipe, or the second medium pressure heating regulating valve inlet door 8, the second medium pressure heating regulating valve 9, the second medium pressure heating regulating valve outlet door 10 on the second medium pressure steam branch pipe.

[0072] The low pressure heating steam in the low pressure steam heating pipeline in the power plant can be supplied to the second medium pressure heating steam pipeline 2 through the first low pressure heating regulating valve inlet door 11, the first low pressure heating regulating valve 12, the first low pressure heating regulating valve outlet door 13 on the first low pressure steam branch pipe, or the second low pressure heating regulating valve inlet door 14, the second low pressure heating regulating valve 15, the second low pressure heating regulating valve outlet door 16 on the second low pressure steam branch pipe.

[0073] When the second medium pressure heating steam pipeline 2 fails, the power plant only provides medium pressure heating steam through the first medium pressure heating steam pipeline 1 at this time. The required low pressure heating steam is supplied after the medium pressure heating steam is reduced pressure by the first pressure reducing valve inlet door 21, the first pressure reducing valve 22, the first pressure reducing valve outlet door 23 in the first pressure reducing regulating valve group, or the second pressure reducing valve inlet door 24, the second pressure reducing valve 25, and the second pressure reducing valve outlet door 26 in the second pressure reducing regulating valve group.

[0074] Through this design and operation mode, the power plant can always provide medium pressure heating steam and low pressure heating steam except for the failure condition of the heating pipeline, realizing the cascade utilization of steam energy and improving the thermal energy utilization efficiency of the power plant.

[0075] Further, since the failure of the second medium pressure heating steam pipeline 2 is a small probability event, the medium pressure pipeline heating steam flow can be designed according to the larger steam supply flow among the petrochemical medium pressure steam load and the petrochemical low pressure steam load of the petrochemical enterprise, so as to further reduce the investment cost of the pipeline.

[0076] Compared with the traditional technology ( Figure 1 ), the first low pressure heating steam pipeline 3 and the second low pressure heating steam pipeline 4 are cancelled in the embodiment.

[0077] Compared with the traditional technology, the first medium pressure heating to medium pressure user total door 17 still connects the second medium pressure heating steam pipeline 2, and the second medium pressure heating to medium pressure user total door 18 still connects the first medium pressure heating steam pipeline 1; but the first low pressure heating to low pressure user total door 19 connects the first medium pressure heating steam pipeline 1, and the second low pressure heating to low pressure user total door 20 connects the second medium pressure heating steam pipeline 2.

[0078] It should be pointed out that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heating steam system, comprising a power plant low-pressure steam heating pipeline, a power plant medium-pressure steam heating pipeline, a first medium-pressure heating regulating valve group, a second medium-pressure heating regulating valve group, a first low-pressure heating regulating valve group, a second low-pressure heating regulating valve group, a first medium-pressure heating steam pipeline, a second medium-pressure heating steam pipeline, a petrochemical medium-pressure steam load, and a petrochemical low-pressure steam load; characterized in that, The power plant's medium-pressure steam heating pipeline is connected to the first medium-pressure heating steam pipeline via a first medium-pressure steam branch pipe, and the first medium-pressure heating regulating valve group is installed on the first medium-pressure steam branch pipe. The power plant's medium-pressure steam heating pipeline is connected to the second medium-pressure heating steam pipeline via a second medium-pressure steam branch pipe, and the second medium-pressure heating regulating valve group is installed on the second medium-pressure steam branch pipe; The power plant's low-pressure steam heating pipeline is connected to the first medium-pressure heating steam pipeline through a first low-pressure steam branch pipe, and the first low-pressure heating regulating valve group is installed on the first low-pressure steam branch pipe. The power plant's low-pressure steam heating pipeline is connected to the second medium-pressure heating steam pipeline via a second low-pressure steam branch pipe, and the second low-pressure heating regulating valve group is installed on the second low-pressure steam branch pipe; The first pressure reducing regulating valve group is connected to the first medium-pressure heating steam pipeline and the petrochemical low-pressure steam load, and the second pressure reducing regulating valve group is connected to the second medium-pressure heating steam pipeline and the petrochemical low-pressure steam load; The first pressure reducing regulating valve group and the second pressure reducing regulating valve group are connected in parallel; The petrochemical medium-pressure steam load is connected to the first medium-pressure heating steam pipeline via a first petrochemical medium-pressure steam branch, and the petrochemical medium-pressure steam load is connected to the second medium-pressure heating steam pipeline via a second petrochemical medium-pressure steam branch. The petrochemical low-pressure steam load is connected to the first medium-pressure heating steam pipeline through the first petrochemical low-pressure steam branch, and the petrochemical low-pressure steam load is connected to the second medium-pressure heating steam pipeline through the second petrochemical low-pressure steam branch.

2. The heating steam system according to claim 1, characterized in that, The first medium-pressure heating regulating valve group includes a first medium-pressure heating regulating valve inlet valve, a first medium-pressure heating regulating valve, and a first medium-pressure heating regulating valve outlet valve; The second medium-pressure heating regulating valve group includes a second medium-pressure heating regulating valve inlet valve, a second medium-pressure heating regulating valve, and a second medium-pressure heating regulating valve outlet valve; The first low-pressure heating regulating valve group includes a first low-pressure heating regulating valve inlet valve, a first low-pressure heating regulating valve, and a first low-pressure heating regulating valve outlet valve; The second low-pressure heating regulating valve group includes a second low-pressure heating regulating valve inlet valve, a second low-pressure heating regulating valve, and a second low-pressure heating regulating valve outlet valve.

3. The heating steam system according to claim 1, characterized in that, The first pressure reducing regulating valve assembly includes a first pressure reducing valve inlet valve, a first pressure reducing valve, and a first pressure reducing valve outlet valve; The second pressure reducing regulating valve assembly includes a second pressure reducing valve inlet valve, a second pressure reducing valve, and a second pressure reducing valve outlet valve.

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