Comprehensive steam utilization equipment for ethylene device

Abstract

The utility model relates to the technical field of chemical process, in particular to ethylene plant steam comprehensive utilization equipment, which comprises an ultrahigh pressure steam header pipe, a cracking furnace, a cracking gas compressor steam turbine and a propylene refrigeration compressor steam turbine, the ultrahigh-pressure steam header pipe is connected with a cracking gas compressor turbine and is connected with a cracking gas compressor turbine condensate pipeline in series; the ultrahigh-pressure steam header pipe is connected with the propylene refrigeration compressor steam turbine and is connected with a condensate pipeline of the propylene refrigeration compressor steam turbine in series; the cracking furnace is connected with a high-pressure steam pipeline and connected with an ultrahigh-pressure steam main pipe through the high-pressure steam pipeline, a check valve and a grid connection valve are arranged on the high-pressure steam pipeline, a branch is arranged between the cracking furnace and the check valve, and the branch is connected with an ultrahigh-pressure steam emptying silencer. The utility model has the following beneficial effects: ultrahigh-pressure steam generated when the cracking furnace is dried is merged into the ultrahigh-pressure steam header pipe for single test and joint test of a steam turbine compressor, so that the ultrahigh-pressure steam is saved, and the starting cost of the device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical process, in particular to a steam comprehensive utilization device for an ethylene device. Background Art

[0002] At present, after the construction of the cracking furnace of the ethylene unit is completed, it is necessary to carry out the furnace drying operation according to the prescribed heating procedure. On the one hand, the refractory materials of the radiation section and the convection section are evenly dried, and on the other hand, the performance of the cracking furnace combustion system, flue gas system, ultra-high pressure steam system, and instrument interlocking system are tested to ensure the success of the first feeding of the cracking furnace. During the heating process of the cracking furnace, a large amount of ultra-high pressure steam generated by the drum is partly used for purging and targeting of the ultra-high pressure steam pipeline of the cracking furnace, and the remaining large amount of ultra-high pressure steam is all discharged into the atmosphere, resulting in huge energy waste.

[0003] As the core equipment of the ethylene plant, the cracking gas compressor, propylene refrigeration compressor, and ethylene refrigeration compressor are driven by ultra-high pressure steam or high pressure steam turbines. Before the plant is put into production, it is necessary to conduct single turbine test and compressor joint test to troubleshoot problems and ensure the successful start-up of the plant at one time. Usually, the whole plant is equipped with a start-up boiler or ultra-high pressure steam is introduced from outside the plant for single turbine test and compressor joint test. The whole process consumes a lot of steam, especially when the start-up boiler or ultra-high pressure steam outside the plant is not available for supply, which seriously affects the start-up progress of the ethylene plant. Therefore, the utility model provides a comprehensive utilization device for steam in an ethylene plant to recover the ultra-high pressure steam produced as a by-product in the cracking furnace baking process and reduce the start-up cost of the plant. Utility Model Content

[0004] The utility model aims to provide a comprehensive utilization device of steam for an ethylene device, which has the characteristics of saving steam and reducing the start-up cost of the device.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions: an ethylene plant steam comprehensive utilization equipment, including an ultra-high pressure steam main pipe, a cracking furnace, a cracking gas compressor turbine, and a propylene refrigeration compressor turbine;

[0006] The super-high-pressure steam main is connected to the cracked gas compressor steam turbine and is connected in series with the cracked gas compressor steam turbine condensate pipeline;

[0007] The super-high-pressure steam main is connected to the propylene refrigeration compressor steam turbine and is connected in series with the propylene refrigeration compressor steam turbine condensate pipeline;

[0008] The cracking furnace is connected to a high-pressure steam pipeline, and is connected to an ultra-high-pressure steam main through the high-pressure steam pipeline. A check valve and a grid-connected valve are provided on the high-pressure steam pipeline. A branch is provided between the cracking furnace and the check valve, and the branch is connected to an ultra-high-pressure steam venting silencer.

[0009] Preferably, a temporary main pipe for ultra-high pressure steam is also included, a T-type tee is arranged between the check valve and the grid-connected valve, the T-type tee is connected with a temporary branch, and the temporary branch is connected to the temporary main pipe for ultra-high pressure steam.

[0010] Preferably, the end of the temporary ultra-high pressure steam main pipe is connected to an electric valve and an ultra-high pressure temporary muffler.

[0011] Preferably, the design temperature of the electric valve and ultra-high pressure temporary silencer is 535°C and the design pressure is 12.5MPa.

[0012] In summary, the utility model has the following beneficial effects:

[0013] 1. Recycle the steam that was originally wasted, reducing energy waste;

[0014] 2. The recovered steam is used for single and joint tests of cracking gas compressor turbines and propylene refrigeration compressor turbines, which not only reduces the waste of ultra-high pressure steam during furnace drying, but also solves the problem of seriously restricting the start-up time of the device when the start-up boiler or ultra-high pressure steam outside the factory is not available, saving ultra-high pressure steam and reducing start-up costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of Example 1;

[0016] Figure 2 It is a schematic diagram of Example 2.

[0017] In the figure, 1. ultra-high pressure steam main pipe; 2. high pressure steam pipeline; 3. check valve; 4. high pressure steam vent silencer; 5. T-type three-way; 6. electric valve; 7. ultra-high pressure temporary silencer; 8. cracking gas compressor turbine; 9. cracking gas compressor turbine condensate pipeline; 10. propylene refrigeration compressor turbine; 11. propylene refrigeration compressor turbine condensate pipeline; 12. grid-connected valve; 13. ultra-high pressure steam temporary main pipe; 14. cracking furnace; 15. branch; 16. temporary branch. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0020] Embodiment 1:

[0021] A comprehensive utilization device for steam in ethylene plant

[0022] like Figure 1 As shown, it includes an ultra-high pressure steam main pipe 1, a cracking furnace 14, a cracking gas compressor steam turbine 8, and a propylene refrigeration compressor steam turbine 10. The ultra-high pressure steam main pipe 1 is connected to the cracking gas compressor steam turbine 8, and is connected in series with a cracking gas compressor steam turbine condensate pipeline 9. The ultra-high pressure steam main pipe 1 is connected to the propylene refrigeration compressor steam turbine 10, and is connected in series with a propylene refrigeration compressor steam turbine condensate pipeline 11. The cracking furnace 14 is connected to the high pressure steam pipeline 2, and is connected to the ultra-high pressure steam main pipe 1 through the high pressure steam pipeline 2. A check valve 3 and a grid-connected valve 12 are provided on the high pressure steam pipeline 2. A branch 15 is provided between the cracking furnace 14 and the check valve 3, and the branch 15 is connected to an ultra-high pressure steam venting silencer 4.

[0023] Embodiment 2:

[0024] A comprehensive utilization device for steam in ethylene plant

[0025] This embodiment is basically the same as Embodiment 1, except that Figure 2 As shown, it also includes an ultra-high pressure steam temporary main pipe 13, a T-type tee 5 is arranged between the check valve 3 and the grid-connected valve 12, the T-type tee 5 is connected with a temporary branch 16, and the temporary branch 16 is connected to the ultra-high pressure steam temporary main pipe 13. The end of the ultra-high pressure steam temporary main pipe 13 is connected to an electric valve 6 and an ultra-high pressure temporary muffler 7.

[0026] The design temperature of the electric valve 6 and the ultra-high pressure temporary silencer 7 is 535℃ and the design pressure is 12.5MPa

[0027] The number of cracking furnaces 14 is 5-10 depending on the size of the device. The number of cracking furnaces 14 is 2-3 per batch, and the ultra-high pressure steam gas production is about 80-120 t / h.

[0028] Directions:

[0029] Before the ultra-high pressure steam generated by the cracking furnace 14 is sent to the ultra-high pressure steam main pipe 1, the check valve 3 and the electric valve 6 are opened first to allow the high pressure steam to pass through the high pressure steam pipeline 2 and the ultra-high pressure steam temporary main pipe 13, and the high pressure steam pipeline 2 is purged through the ultra-high pressure temporary silencer 7.

[0030] After the purge and target shooting are qualified, the grid-connected valve 12 is opened to send the ultra-high pressure steam into the ultra-high pressure steam main pipe 1, so that the steam enters the cracking gas compressor turbine 8 and the propylene refrigeration compressor turbine 10. The ultra-high pressure steam temporary main pipe 13 is removed and the equal diameter pipe cap is welded.

Claims

1. An ethylene plant steam comprehensive utilization device, characterized in that: It comprises an ultra-high pressure steam main pipe (1), a cracking furnace (14), a cracking gas compressor steam turbine (8), and a propylene refrigeration compressor steam turbine (10); The super-high-pressure steam main pipe (1) is connected to the cracked gas compressor steam turbine (8) and is connected in series with a cracked gas compressor steam turbine condensate pipeline (9); The super-high-pressure steam main pipe (1) is connected to the propylene refrigeration compressor steam turbine (10), and is connected in series with a propylene refrigeration compressor steam turbine condensate pipeline (11); The cracking furnace (14) is connected to a high-pressure steam pipeline (2), and is connected to an ultra-high-pressure steam main pipe (1) through the high-pressure steam pipeline (2). A check valve (3) and a grid-connected valve (12) are provided on the high-pressure steam pipeline (2). A branch line (15) is provided between the cracking furnace (14) and the check valve (3), and the branch line (15) is connected to an ultra-high-pressure steam venting silencer (4).

2. The ethylene plant steam comprehensive utilization equipment according to claim 1, characterized in that: It also includes a temporary super-high-pressure steam main pipe (13), a T-shaped three-way valve (5) is arranged between the check valve (3) and the grid-connected valve (12), the T-shaped three-way valve (5) is connected to a temporary branch (16), and the temporary branch (16) is connected to the temporary super-high-pressure steam main pipe (13).

3. The ethylene plant steam comprehensive utilization equipment according to claim 2, characterized in that: The end of the temporary super-high-pressure steam main pipe (13) is connected to an electric valve (6) and a temporary super-high-pressure muffler (7).

4. The ethylene plant steam comprehensive utilization equipment according to claim 3, characterized in that: The design temperature of the electric valve (6) and the ultra-high pressure temporary silencer (7) is 535° C. and the design pressure is 12.5 MPa.

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