Slurry system tail gas hydrogen recovery system

Abstract

A tail gas hydrogen recovery system of a slurry system comprises a flash tank, a cooler, a condensation tank and a hydrogen buffer tank, the top of the flash tank is connected with an inlet of the cooler through a first pipeline, a bottom outlet of the cooler is connected with an inlet of the condensation tank through a second pipeline, and the top of the cooler is connected with the hydrogen buffer tank through a third pipeline; a refrigerant coil pipe is arranged in the flash tank, and the two ends of the refrigerant coil pipe are connected with a refrigerant inlet pipe and a refrigerant outlet pipe respectively; a condensing coil is arranged in the cooler, and two ends of the condensing coil are respectively connected with a condensate inlet pipe and a condensate outlet pipe; and a cold hydrogenated slurry slag inlet pipe is arranged at the top of the flash tank. According to the system, the tail gas pipeline is improved, so that the safety problem that the tail gas washing tower is on fire is effectively avoided. According to the system, the tail gas pipeline is improved, so that the safety problem that the tail gas washing tower is on fire is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of silicon material production system, especially relates to a tail gas hydrogen recovery system of slag slurry system. BACKGROUND

[0002] In the production process of the slag slurry system, a large amount of tail gas is usually generated. After condensation by the flash condenser, the tail gas is transported to the tail gas washing tower for absorption treatment. However, the tail gas often contains hydrogen. Due to the limitations of existing technical means, the hydrogen in the tail gas cannot be effectively recovered and utilized, resulting in waste of raw materials. In addition, the vent pipe of the tail gas washing tower often catches fire, which not only threatens the safety of production, but also may cause environmental pollution and resource waste.

[0003] In the prior art, some enterprises have adopted various methods to try to solve the above problems, such as increasing tail gas treatment equipment or improving the structure of the washing tower. However, these methods often have problems such as high cost and unsatisfactory effect, and cannot fundamentally solve the problems of hydrogen recovery and safety of the washing tower. Therefore, a new technical scheme is urgently needed to improve the hydrogen recovery rate and increase the safety factor of the washing tower. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a tail gas hydrogen recovery system of slag slurry system. The system improves the tail gas pipeline and effectively avoids the safety problem of fire of the tail gas washing tower.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] A tail gas hydrogen recovery system of slag slurry system, comprising a flash tank, a cooler, a condenser and a hydrogen buffer tank; the top of the flash tank is connected with the inlet of the cooler through a first pipeline, the bottom outlet of the cooler is connected with the inlet of the condenser through a second pipeline, and the top of the cooler is connected with the hydrogen buffer tank through a third pipeline;

[0007] The flash tank is provided with a refrigerant coil pipe, and the two ends of the refrigerant coil pipe are respectively connected with a refrigerant inlet pipe and a refrigerant outlet pipe;

[0008] The cooler is provided with a condensing coil pipe, and the two ends of the condensing coil pipe are respectively connected with a condensate inlet pipe and a condensate outlet pipe;

[0009] The top of the flash tank is provided with a cold hydrogenated slurry slag inlet pipe.

[0010] Preferably, a first valve is arranged on the cold hydrogenated slurry slag inlet pipe.

[0011] Preferably, a second valve is arranged on the first pipeline.

[0012] Preferably, a tenth valve is arranged on the second pipeline.

[0013] Preferably, the third pipeline is equipped with a third valve and a fourth valve.

[0014] Preferably, a seventh valve is provided on the refrigerant inlet pipe, and a sixth valve is provided on the refrigerant outlet pipe.

[0015] Preferably, the condensate inlet pipe is equipped with a ninth valve, and the condensate outlet pipe is equipped with an eighth valve.

[0016] The present invention can achieve the following beneficial effects:

[0017] 1. This system effectively avoids the safety issue of fire in the exhaust gas scrubbing tower by improving the exhaust gas pipeline.

[0018] 2. Through improvements, hydrogen has been recovered and reused in this system, achieving maximum economic benefits in terms of energy utilization and raw material recovery. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a system structure diagram of the present invention.

[0021] In the diagram: there are valve 1, valve 2, valve 3, valve 4, valve 6, valve 7, valve 8, valve 9, valve 10, flash evaporator 11, cooler 12, condensate tank 13, and hydrogen buffer tank 14. Detailed Implementation

[0022] Preferred solutions include Figure 1 As shown, a hydrogen recovery system for slurry system tail gas is used to efficiently recover and utilize hydrogen generated during slurry treatment, reducing resource waste and environmental impact, and also lowering safety hazards. This system includes four main components: a flash tank, a cooler, a condenser, and a hydrogen buffer tank. The top of the flash tank is connected to the inlet of the cooler via a first pipe for initial gas separation; the bottom outlet of the cooler is connected to the inlet of the condenser via a second pipe for further cooling and condensing non-hydrogen components in the gas; the top of the cooler is connected to the hydrogen buffer tank via a third pipe for collecting the purified hydrogen.

[0023] The flash tank is equipped with a refrigerant coil, with its two ends connected to a refrigerant inlet pipe and a refrigerant outlet pipe, respectively, to provide necessary cooling and help achieve effective separation of hydrogen from other components in the slurry. A seventh valve (7) is installed on the refrigerant inlet pipe, and a sixth valve (6) is installed on the refrigerant outlet pipe to control the refrigerant flow rate.

[0024] The condenser is provided with a condensing coil, and the two ends of the condensing coil are connected with a condensate liquid inlet pipe and a condensate liquid outlet pipe respectively, so that the temperature is further reduced through circulating condensate liquid, and the condensation of non-hydrogen components is promoted. The ninth valve 9 is arranged on the condensate liquid inlet pipe, and the eighth valve 8 is arranged on the condensate liquid outlet pipe, so that the flow rate and pressure of the condensate liquid can be adjusted.

[0025] The top of the flash tank is provided with a cold hydrogenated slurry residue inlet pipe for guiding the slurry mixture to be treated to enter. A first valve 1 is arranged on the inlet pipe for controlling the flow rate and timing of the slurry entering the system, so as to ensure the safety and stability of the operation.

[0026] Further, the second valve 2 is arranged on the first pipeline for regulating the gas flow from the flash tank to the condenser; the tenth valve 10 is arranged on the second pipeline for managing the flow direction from the condenser to the condensate tank; the third valve 3 and the fourth valve 4 are arranged on the third pipeline respectively for adjusting the pressure and flow rate of the hydrogen before entering the buffer tank, so as to ensure the stable recovery of hydrogen.

[0027] The working principle of the system is as follows:

[0028] Water at 7℃ is supplied to the flash tank coil to reduce the chlorosilane brought into the rear-end system; the tail gas from the top of the flash tank is subjected to flash condensation, so that the chlorosilane and hydrogen (non-condensable gas) in the tail gas are separated, the liquid-phase chlorosilane is sent to the cold hydrogenation system, and the non-condensable gas (hydrogen) is sent to the hydrogen buffer tank through a pipeline, and the hydrogen is recovered and utilized through a compressor.

[0029] After normal production, the 6# valve (i.e. the sixth valve) and the 7# valve (i.e. the seventh valve) are opened, so that the refrigerant enters the coil; after the slurry from the cold hydrogenation enters the flash tank, the temperature and pressure are reduced, the 8# valve and the 9# valve are opened, -15℃ brine is supplied to the flash condenser, the 2# valve and the 10# valve are opened, so that the chlorosilane in the tail gas is condensed and recovered into the condensate tank, and the 3# valve and the 4# valve are opened, so that the hydrogen enters the hydrogen buffer tank.

[0030] The above-described embodiments are only preferred technical solutions of the present application, and should not be regarded as limiting the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, and the equivalent replacement solutions of the technical features claimed in the claims are within the protection scope. That is, the equivalent replacement improvements within this range are also within the protection scope of the present application.

Claims

1. A slurry system offgas hydrogen recovery system characterized by: The flash tank, the cooler, the condensing tank and the hydrogen buffer tank are connected by the first pipeline, the second pipeline and the third pipeline. The flash tank is internally provided with a refrigerant coil, and the refrigerant inlet pipe and the refrigerant outlet pipe are respectively connected to the two ends of the refrigerant coil. The cooler is internally provided with a condensing coil, and the condensing liquid inlet pipe and the condensing liquid outlet pipe are respectively connected to the two ends of the condensing coil. The top of the flash tank is provided with a cold hydrogenated slurry inlet pipe.

2. The system of claim 1, wherein: A first valve (1) is arranged on the cold hydrogenated slurry inlet pipe.

3. The system of claim 1, wherein: A second valve (2) is arranged on the first pipeline.

4. The system of claim 1, wherein: A tenth valve (10) is arranged on the second pipeline.

5. The system of claim 1, wherein: A third valve (3) and a fourth valve (4) are arranged on the third pipeline.

6. The system of claim 1, wherein: A seventh valve (7) is arranged on the refrigerant inlet pipe, and a sixth valve (6) is arranged on the refrigerant outlet pipe.

7. The system of claim 1, wherein: A ninth valve is arranged on the condensing liquid inlet pipe, and an eighth valve (8) is arranged on the condensing liquid outlet pipe.

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