Reduced hydrogen tail gas dust removal device

Abstract

The utility model discloses a reduction hydrogen tail gas dust removal device, which comprises a reduction chamber, a reactor, a cyclone separator and a catalyst recovery tank, the reduction chamber is positioned above the reactor, the cyclone separator is arranged in the reduction chamber and is hung at a top seal head of the reduction chamber, and the top of the cyclone separator extends out of the reduction chamber through a tail gas outlet; a tail gas inlet is formed in the side face of a barrel of the cyclone separator, a catalyst recovery pipe is arranged at the bottom of the cyclone separator, penetrates through the side wall of the reduction chamber and is communicated with a catalyst recovery tank arranged outside the reduction chamber, a catalyst stop valve is arranged on the catalyst recovery pipe outside the reduction chamber, and a catalyst inlet is formed in the top of the reduction chamber. A reduction hydrogen inlet is formed in the bottom side wall of the reduction chamber. According to the device, the process flow is simplified, the pipeline arrangement is reduced, the investment is saved, the catalyst dust in the reduced hydrogen tail gas can be effectively removed, the shutdown of the device caused by dust blockage is better reduced, and the long-period operation of the device is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of petrochemical industry and relates to a tail gas removal device, in particular to a hydrogen reduction tail gas dust removal device. Background Art

[0002] Bimetallic catalyst reduction involves reducing the oxidized active metal components of a catalyst to a metallic state in the presence of hydrogen, thus enhancing the catalyst's metallic properties. However, the hydrogen exhaust from the reduction often carries catalyst powder, which can clog equipment and related pipelines. It can also clog instruments, valves, and other ancillary components, causing monitoring errors and posing safety risks to production.

[0003] The current method for treating reduced hydrogen tail gas is as follows: the reduced hydrogen tail gas enters the reduced hydrogen tail gas filter after coming out from the upper part of the reduction chamber. The filtered reduced hydrogen tail gas enters the upstream gas-liquid separation tank after heat exchange cooling. The reduced hydrogen tail gas filter generally adopts a basket structure with a filtration accuracy of 30 to 50 μm. One is on and one is on standby. The filtration area is sufficient to be switched once a week, and a nitrogen backflush system is provided. Existing problems: The catalyst powder filtration effect is poor, and powder accumulation causes blockage of equipment and pipelines, affecting the normal operation of the device; the filter is backflushed regularly to remove dust on the filter element, and the backflush gas will carry dust, causing environmental pollution; the reduced hydrogen tail gas contains dust, and when the filter switches to backflush, the filter inlet valve is not closed tightly, and there is a risk of leakage. It is urgent to find a device to improve the dust removal effect of the reduced hydrogen tail gas and ensure the safe and stable operation of the device.

[0004] CN203874601U discloses a reducing gas filter for a continuous reforming unit. The filter's structural components are described. The filter assembly utilizes an external filter medium with internal airflow channels. Partial blockage of the filter medium does not affect filtration at other locations, thereby improving filter element utilization. However, the filter is a traditional basket filter with low filtration accuracy.

[0005] CN217549343 U discloses a reforming catalyst reduction tail gas purification and recovery device, relating to the field of tail gas purification technology. The device primarily comprises a recovery tank containing a purification liquid for purifying the tail gas. A mixing mechanism and multiple oblique baffles improve the balance between the purification liquid and the reduced hydrogen tail gas, enhancing purification efficiency. However, its disadvantages include a relatively complex process, the need for continuous replenishment of the purification liquid, which increases discharge volume, and the potential for entrainment of the purified liquid in the treated reduced hydrogen tail gas, impacting product separation in downstream equipment. Utility Model Content

[0006] In order to solve the problems in the prior art of poor filtering effect and possible clogging of catalyst dust resulting in unstable operation of the device, the utility model provides a hydrogen reduction tail gas dust removal device.

[0007] The utility model provides a reduced hydrogen tail gas dust removal device comprising a reduction chamber, a reactor, a cyclone separator and a catalyst recovery tank. The reduction chamber is located above the reactor, the cyclone separator is arranged inside the reduction chamber and hoisted at the top end cap of the reduction chamber, the cyclone separator cylinder is close to the side wall of the reduction chamber, the top of the cyclone separator extends to the outside of the reduction chamber through the tail gas outlet, the side of the cyclone separator cylinder is provided with a tail gas inlet, the bottom of the cyclone separator is provided with a catalyst recovery pipe, the catalyst recovery pipe passes through the side wall of the reduction chamber and is connected to the catalyst recovery tank arranged outside the reduction chamber, a catalyst shut-off valve is provided on the catalyst recovery pipe outside the reduction chamber, a catalyst inlet is provided at the top of the reduction chamber, and a reduced hydrogen inlet is provided on the bottom side wall of the reduction chamber.

[0008] As an improvement, in order to better recover the catalyst dust, a dust collection bucket is provided under the catalyst recovery tank. The dust collection bucket is connected to the catalyst recovery tank through a pipeline, and a dust shut-off valve is provided on the pipeline.

[0009] The reduced hydrogen tail gas dust removal device of the utility model also includes a reduced hydrogen inlet pipeline and a reduced hydrogen tail gas outlet pipeline. The reduced hydrogen inlet pipeline is connected to the reduced hydrogen inlet arranged on the bottom side wall of the reduction chamber, and the reduced hydrogen tail gas outlet pipeline is connected to the tail gas outlet at the top of the cyclone separator. A reduced hydrogen electric heater is provided on the reduced hydrogen inlet pipeline.

[0010] In order to better utilize heat, a reduced hydrogen heat exchanger is provided upstream of the reduced hydrogen electric heater, and the reduced hydrogen inlet pipeline and the reduced hydrogen tail gas outlet pipeline exchange energy through the reduced hydrogen heat exchanger.

[0011] The utility model can be used for a reforming device and a dehydrogenation device. The operating pressure of the reduction chamber is a gauge pressure of 0.35-0.70 MPa, and the operating temperature is 420-580° C. The reduced hydrogen includes PSA hydrogen and reformed hydrogen.

[0012] The hydrogen reduction electric heater is an electric heater or a heating furnace.

[0013] The separation accuracy requirement of the cyclone separator is ≥5 μm and the removal rate of catalyst dust is not less than 99.9%.

[0014] The utility model has the following beneficial effects:

[0015] 1) In the utility model, the reduction chamber and the cyclone separator are combined into one to recover the catalyst dust, which not only simplifies the process flow, reduces the pipeline layout, saves investment, and effectively removes the catalyst dust in the reduced hydrogen tail gas, but also uses a cyclone separator with a catalyst dust removal rate of not less than 99.9% for ≥5μm, which can better reduce the shutdown of the device due to dust blockage and ensure the long-term operation of the device.

[0016] 2) In the present invention, the catalyst dust first settles from the cyclone separator to the catalyst recovery tank, where it is naturally cooled to room temperature without causing environmental pollution. It then falls into the dust collection barrel through a sealed metal hose and is finally sealed and sent to the catalyst manufacturer to recover precious metals without causing waste of resources.

[0017] 3) The cyclone separator of the utility model can be operated continuously without switching, has no backflush system, collects catalyst dust in a closed manner, avoids dust pollution, and is more environmentally friendly than traditional basket filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the hydrogen reduction tail gas dust removal device of the utility model.

[0019] In the figure: 1-reduction chamber, 2-cyclone separator, 3-exhaust gas inlet, 4-exhaust gas outlet, 5-catalyst recovery pipe, 6-catalyst shut-off valve, 7-catalyst recovery tank, 8-dust shut-off valve, 9-dust collection barrel, 10-reactor, 11-electric heater, 12-reduced hydrogen heat exchanger, 13-reduced hydrogen inlet pipeline, 14-reduced hydrogen exhaust gas outlet pipeline;

[0020] A-catalyst, B-reduced hydrogen, C-reduced hydrogen tail gas. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the hydrogen reduction tail gas dust removal device provided by the utility model includes a reduction chamber 1, a cyclone separator 2 arranged inside the reduction chamber 1 near the top head, the cyclone separator 2 is provided with an exhaust gas inlet 3 and an exhaust gas outlet 4, the exhaust gas outlet 4 extends to the outside of the reduction chamber 1, and a catalyst recovery pipe 5 is provided at the bottom of the cyclone separator 2. The catalyst recovery pipe 5 passes through the side wall of the reduction chamber 1 and is connected to the catalyst recovery tank 7 outside the reduction chamber 1 through the catalyst shut-off valve 6. The catalyst recovery tank 7 is connected to the dust collection barrel 9 located below the catalyst recovery tank 7 through the dust shut-off valve 8, and the reactor 10 is located below the reduction chamber 1.

[0023] A catalyst inlet is provided at the top of the reduction chamber 1, and a reduction hydrogen inlet is provided at the bottom side wall thereof.

[0024] A reduced hydrogen heat exchanger 12 and an electric heater 11 are provided on the reduced hydrogen inlet pipeline 13 , and the reduced hydrogen inlet pipeline 13 is communicated with a reduced hydrogen inlet provided on the bottom side wall of the reduction chamber 1 .

[0025] A reduced hydrogen heat exchanger 12 is provided on the reduced hydrogen tail gas outlet pipeline 14 , and the reduced hydrogen tail gas outlet pipeline 14 is communicated with the tail gas outlet 4 of the cyclone separator 2 .

[0026] The reduced hydrogen inlet pipeline 13 and the reduced hydrogen tail gas outlet pipeline 14 exchange energy through the reduced hydrogen heat exchanger 12 .

[0027] The following combination Figure 1 The workflow of this utility model is described as follows:

[0028] The regenerated catalyst A enters the reduction chamber 1 through the catalyst inlet at the top of the reduction chamber 1 and flows from top to bottom; the reduced hydrogen B is heated along the reduced hydrogen inlet pipeline 13 through the reduced hydrogen heat exchanger 12 and the electric heater 11 in sequence, and enters the reduction chamber 1 through the reduced hydrogen inlet on the bottom side wall of the reduction chamber 1 and flows from bottom to top.

[0029] Inside the reduction chamber 1, the catalyst A flowing from top to bottom contacts the reducing hydrogen B flowing from bottom to top in countercurrent to cause a reduction reaction, and the catalyst A changes from an oxidized state to a reduced state, and the activity of the catalyst A is restored. The activated catalyst A enters the reactor 10 by gravity to react.

[0030] The reduced hydrogen after the reaction carries catalyst dust and enters the cyclone separator 2 through the tail gas inlet 3. After the catalyst dust is separated inside the cyclone separator 2, the reduced hydrogen tail gas C is discharged from the tail gas outlet 4 and then along the reduced hydrogen tail gas outlet pipeline 14. After heat exchange and cooling with the reduced hydrogen B in the reduced hydrogen heat exchanger 12, it enters the subsequent gas-liquid separation tank.

[0031] The catalyst dust separated inside the cyclone separator 2 is deposited at the bottom of the cyclone separator 2. The catalyst shut-off valve 6 is opened regularly so that the pressure of the cyclone separator 2 and the catalyst recovery tank 7 are the same. The catalyst dust settles and falls into the catalyst recovery tank 7 through the catalyst recovery pipe 5. After unloading, the catalyst shut-off valve 6 is closed. The catalyst dust is naturally cooled to room temperature in the catalyst recovery tank 7. The dust shut-off valve 8 is opened and the catalyst dust falls into the dust collection barrel 9 through a sealed metal hose. The catalyst dust in the dust collection barrel 9 is sealed and sent to the catalyst manufacturer for recovery of precious metals.

Claims

1. A device for removing dust from hydrogen reduction tail gas, characterized in that: It includes a reduction chamber, a reactor, a cyclone separator and a catalyst recovery tank. The reduction chamber is located above the reactor. The cyclone separator is arranged inside the reduction chamber and hoisted at the top head of the reduction chamber. The cyclone separator cylinder is close to the side wall of the reduction chamber. The top of the cyclone separator extends to the outside of the reduction chamber through the exhaust gas outlet. The side of the cyclone separator cylinder is provided with an exhaust gas inlet. The bottom of the cyclone separator is provided with a catalyst recovery pipe. The catalyst recovery pipe passes through the side wall of the reduction chamber and is connected with the catalyst recovery tank arranged outside the reduction chamber. A catalyst cut-off valve is provided on the catalyst recovery pipe outside the reduction chamber. A catalyst inlet is provided at the top of the reduction chamber, and a reduced hydrogen inlet is provided on the bottom side wall of the reduction chamber.

2. The hydrogen reduction tail gas dust removal device according to claim 1, characterized in that: A dust collection bucket is provided below the catalyst recovery tank. The dust collection bucket is connected to the catalyst recovery tank through a pipeline, and a dust shut-off valve is provided on the pipeline.

3. The hydrogen reduction tail gas dust removal device according to claim 1, characterized in that: It also includes a reduced hydrogen inlet pipeline and a reduced hydrogen tail gas outlet pipeline. The reduced hydrogen inlet pipeline is connected to the reduced hydrogen inlet set on the bottom side wall of the reduction chamber, and the reduced hydrogen tail gas outlet pipeline is connected to the tail gas outlet at the top of the cyclone separator. A reduced hydrogen electric heater is provided on the reduced hydrogen inlet pipeline.

4. The hydrogen reduction tail gas dust removal device according to claim 3, characterized in that: A reduced hydrogen heat exchanger is provided upstream of the reduced hydrogen electric heater, and the reduced hydrogen inlet pipeline and the reduced hydrogen tail gas outlet pipeline exchange energy through the reduced hydrogen heat exchanger.

5. The hydrogen reduction tail gas dust removal device according to claim 2, characterized in that: It also includes a reduced hydrogen inlet pipeline and a reduced hydrogen tail gas outlet pipeline. The reduced hydrogen inlet pipeline is connected to the reduced hydrogen inlet set on the bottom side wall of the reduction chamber, and the reduced hydrogen tail gas outlet pipeline is connected to the tail gas outlet at the top of the cyclone separator. A reduced hydrogen electric heater is provided on the reduced hydrogen inlet pipeline.

6. The hydrogen reduction tail gas dust removal device according to claim 5, characterized in that: A reduced hydrogen heat exchanger is provided upstream of the reduced hydrogen electric heater, and the reduced hydrogen inlet pipeline and the reduced hydrogen tail gas outlet pipeline exchange energy through the reduced hydrogen heat exchanger.

7. The hydrogen reduction tail gas dust removal device according to any one of claims 1 to 6, characterized in that: The separation accuracy of the cyclone separator is: the removal rate of catalyst dust ≥5μm is not less than 99.9%.

8. The hydrogen reduction tail gas dust removal device according to any one of claims 1 to 6, characterized in that: The operating pressure of the reduction chamber is 0.35-0.70 MPa, and the operating temperature is 420-580°C.

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