Coking desulfurization system

Abstract

The utility model discloses a coking desulfurization system which comprises a sulfur foam tank and is characterized in that the sulfur foam tank conveys foam liquid to a plate-and-frame filter press through a sulfur foam pump, a filtrate outlet of the plate-and-frame filter press is connected with a sulfur melting kettle through a filtrate pipe, and the upper part of the side end of the sulfur melting kettle is connected with a solution buffer tank through an overflow pipe; sediments at the bottom of the sulfur melting kettle are conveyed to a plate-and-frame filter press through a reflux pump to be circularly treated. According to the utility model, the plate-and-frame filter press is arranged at the rear end of the sulfur foam tank, and the filtrate generated by the plate-and-frame filter press is conveyed to the sulfur melting kettle with static precipitation for precipitation, so that an original continuous sulfur melting mode can be changed into an indirect sulfur melting mode, thereby reducing the use amount of steam in a steam heating process of the desulfurization liquid; and the secondary salt content of the desulfurization solution is reduced, and the efficiency of absorbing hydrogen sulfide by the desulfurization solution entering the desulfurization system subsequently is improved.

Description

Technical Field

[0001] The utility model relates to the field of coking desulfurization, in particular to a coking desulfurization system. Background Art

[0002] The existing coking desulfurization liquid treatment mainly adopts the sulfur melting kettle to treat (such as Figure 2 As shown), the sulfur foam liquid from the top of the desulfurization regeneration tower enters the sulfur foam tank 1 for storage, and the sulfur foam liquid in the sulfur foam tank 1 is transported to the sulfur melting kettle 7 heated by steam through its external jacket through the sulfur foam pump 2. The sulfur melting kettle 7 is used to melt the sulfur foam into sulfur particles and separate them from the sulfur solution through steam heating. The sulfur particles gather at the bottom and are discharged to the placement tank through the bottom outlet for treatment, while the upper solution is transported to the solution buffer tank 9 through the desulfurization clear liquid pipe 701, and the solution buffer tank 9 is then transported to the desulfurization system through the solution buffer pump 10 for use;

[0003] However, the steam used for heating the sulfur melting kettle 7 is large and is used continuously, resulting in high energy consumption of the sulfur melting kettle and very low sulfur output; and the temperature of the desulfurization solution is high after steam heating, resulting in a high content of secondary salts in the desulfurization solution, which inhibits the efficiency of the subsequent desulfurization liquid entering the desulfurization system to absorb hydrogen sulfide, resulting in low desulfurization efficiency. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a coking desulfurization system.

[0005] The utility model is realized through the following technical solutions:

[0006] A coking desulfurization system includes a sulfur foam tank, which is characterized in that the sulfur foam tank transports foam liquid to a plate and frame filter press through a sulfur foam pump, the filtrate outlet of the plate and frame filter press is connected to a molten sulfur kettle through a filtrate pipe, the upper side end of the molten sulfur kettle is connected to a solution buffer tank through an overflow pipe, and the sediment at the bottom of the molten sulfur kettle is transported to the plate and frame filter press for circulation treatment through a reflux pump.

[0007] Further optionally, it also includes a steam heating coil arranged inside the sulfur foam tank, the outlet of the heating coil is connected to a spiral heating pipe wound on a foam liquid pipe connecting the sulfur foam tank and the sulfur foam pump, and the outlet of the spiral heating pipe is connected to a condensate drain pipe.

[0008] Further optionally, control valves are installed on the inlet and outlet of the sulfur foam pump and the reflux pump as well as the filtrate pipe and the overflow pipe.

[0009] Further optionally, the filtrate pipe bypass is connected to the solution buffer tank through a secondary line pipe, and a cut-off valve is installed on the secondary line pipe.

[0010] Further optionally, a solution buffer pump for conveying the solution to the desulfurization system is provided at the bottom of the solution buffer tank.

[0011] Further optionally, a single sulfur tank for placing single sulfur solid material is provided at the lower part of the plate and frame filter press.

[0012] Compared with the existing technology, the beneficial effect of the utility model is as follows: the utility model can change the original continuous sulfur melting method into indirect sulfur melting by arranging a plate and frame filter press at the rear end of the sulfur foam tank and conveying the filtrate generated by the plate and frame filter press to a sulfur melting kettle with static sedimentation for precipitation, which not only reduces the steam usage of the desulfurization liquid through the steam heating process, but also reduces the secondary salt content of the desulfurization solution, thereby improving the efficiency of the desulfurization liquid that subsequently enters the desulfurization system in absorbing hydrogen sulfide. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model system;

[0014] Figure 2 It is a schematic diagram of the prior art of this utility;

[0015] In the figure: sulfur foam tank 1, heating coil 101, spiral heating pipe 102, condensate drainage 103, sulfur foam pump 2, foam liquid pipe 3, plate and frame filter press 4, elemental sulfur tank 5, filtrate pipe 6, molten sulfur kettle 7, desulfurization clear liquid pipe 701, separation liquid pipe 701, overflow pipe 8, solution buffer tank 9, solution buffer pump 10, sedimentation pipe 11, reflux pump 12, and bypass pipe 13. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0017] like Figure 1 As shown, a coking desulfurization system includes a sulfur foam tank 1, which is characterized in that: the sulfur foam tank 1 transports the foam liquid to the plate and frame filter press 4 through the sulfur foam pump 2, the plate and frame filter press 4 collects the elemental sulfur in the solution by filtering, reduces the suspended sulfur content in the solution, and improves the absorption efficiency of the solution, the filtrate outlet of the plate and frame filter press 4 is connected to the sulfur melting kettle 7 through the filtrate pipe 6, the sulfur melting kettle 7 does not use steam for heating, but only plays the role of transferring and caching the solution, the upper side end of the sulfur melting kettle 7 is connected to the solution buffer tank 9 through the overflow pipe 8, and the sediment at the bottom of the sulfur melting kettle 7 is transported to the plate and frame filter press 4 for circulation treatment through the reflux pump 12.

[0018] It also includes a steam heating coil 101 arranged inside the sulfur foam tank 1, and the outlet of the heating coil 101 is connected to a spiral heating pipe 102 wound on the foam liquid pipe 3 connecting the sulfur foam tank 1 and the sulfur foam pump 2, and the outlet of the spiral heating pipe 102 is connected to a condensate drainage pipe 103. The condensate with a certain temperature generated after the steam heating coil 101 is heated is further drained to the spiral heating pipe 102 on the foam liquid pipe 3 for secondary heating, thereby avoiding blockage of the foam liquid pipe 3 in front of the inlet of the sulfur foam pump 2 (the control valve at the inlet of the sulfur foam pump 2 is in a closed state when the sulfur foam pump 2 is not in use).

[0019] Control valves are installed on the inlet and outlet of the sulfur foam pump 2 and the reflux pump 12 as well as the filtrate pipe 6 and the overflow pipe 8. The installed control valves facilitate the control of the system.

[0020] The filtrate pipe 6 is bypassed and connected to the solution buffer tank 9 through a secondary line pipe 13, on which a shut-off valve is installed. When a fault occurs in the molten sulfur kettle 7, the control valve on the filtrate pipe 6 can be closed, and the shut-off valve of the secondary line pipe 13 can be opened to switch out the molten sulfur kettle 7. The filtrate then directly enters the solution buffer tank 9 from the secondary line pipe 13, thereby ensuring the stability of the system operation.

[0021] A solution buffer pump 10 for conveying the solution to the desulfurization system is provided at the bottom of the solution buffer tank 9 .

[0022] The lower part of the plate and frame filter press 4 is provided with an elemental sulfur tank 5 for placing elemental sulfur solid material.

[0023] The implementation principle of a coking desulfurization system in the embodiment of the present application is:

[0024] The sulfur foam liquid in the sulfur foam tank 1 is transported to the plate-frame filter press 4 through the sulfur foam pump 2. The solid elemental sulfur in the sulfur foam liquid is filtered and dropped into the elemental sulfur tank 5 for storage through the filtering effect of the plate-frame filter press 4. The plate-frame filter press 4 transports the desulfurized liquid separated from the sulfur foam liquid along the filtrate pipe 6 to the inside of the sulfur melting kettle 7 for static precipitation. After static precipitation for a period of time, the control valve on the overflow pipe 8 is opened, and the supernatant in the sulfur melting kettle 7 is transported to the solution buffer tank 9 for storage along the overflow pipe 8, and the sediment precipitated at the bottom of the sulfur melting kettle 7 is transported to the inlet of the plate-frame filter press 4 through the reflux pump 12 started regularly. The circulating filtration treatment is carried out. Since the plate and frame filter press 4 has a high processing efficiency, the original sulfur melting mode of the sulfur melting kettle 7 is changed to indirect sulfur melting of the plate and frame filter press 4, thereby improving the sulfur melting efficiency of the equipment. At the same time, the original sulfur melting kettle 7 is stopped from use and replaced with a "transfer tank" with static sedimentation, which greatly reduces the content of impurities in the desulfurization liquid entering the solution buffer tank 9, thereby ensuring the stability of the subsequent desulfurization system operation. This not only reduces the steam usage of the desulfurization liquid after the steam heating process, but also reduces the secondary salt content of the desulfurization solution, thereby improving the efficiency of the desulfurization liquid entering the desulfurization system in absorbing hydrogen sulfide.

[0025] When the rear plate and frame filter press 4 is used, the sulfur foam pump 2 is changed to intermittent start-up (start-up operation for 2 hours, stop operation for 4 hours); there is a static heating blind spot in the foam liquid pipe 3 between the sulfur foam pump 2 and the sulfur foam tank 1. In order to avoid condensation and blockage of the foam liquid in the foam liquid pipe 3, the 50-degree Celsius condensate generated by the heating coil 101 heating the sulfur foam tank 1 is drained to the spiral heating pipe 102 wound on the foam liquid pipe 3, and the foam liquid pipe 3 is heated for the second time to avoid blockage caused by condensation of the sulfur foam liquid in the foam liquid pipe 3, thereby ensuring the stability of the intermittent desulfurization system.

[0026] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A coking desulfurization system, comprising a sulfur foam tank (1), characterized in that: The sulfur foam tank (1) transports the foam liquid to the plate-frame filter press (4) via the sulfur foam pump (2); the filtrate outlet of the plate-frame filter press (4) is connected to the sulfur melting kettle (7) via the filtrate pipe (6); the upper side end of the sulfur melting kettle (7) is connected to the solution buffer tank (9) via the overflow pipe (8); the sediment at the bottom of the sulfur melting kettle (7) is transported to the plate-frame filter press (4) for circulation treatment via the reflux pump (12).

2. A coking desulfurization system according to claim 1, characterized in that: It also includes a steam heating coil (101) arranged inside the sulfur foam tank (1), the outlet of the heating coil (101) is connected to a spiral heating pipe (102) wound on a foam liquid pipe (3) connected between the sulfur foam tank (1) and the sulfur foam pump (2), and the outlet of the spiral heating pipe (102) is connected to a condensate drain pipe (103).

3. A coking desulfurization system according to claim 2, characterized in that: Control valves are installed on the inlet and outlet of the sulfur foam pump (2), the reflux pump (12), the filtrate pipe (6) and the overflow pipe (8).

4. A coking desulfurization system according to claim 1, characterized in that: The filtrate pipe (6) is bypassed and connected to the solution buffer tank (9) through a secondary line pipe (13), and a cut-off valve is installed on the secondary line pipe (13).

5. A coking desulfurization system according to claim 4, characterized in that: A solution buffer pump (10) for conveying the solution to the desulfurization system is arranged at the bottom of the solution buffer tank (9).

6. A coking desulfurization system according to claim 1, characterized in that: The lower part of the plate and frame filter press (4) is provided with an elemental sulfur tank (5) for placing elemental sulfur solid material.

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