CN212536012U - Supercharger system with emptying gas recycling function - Google Patents

Abstract

The utility model relates to a recovery of compressor vent gas in synthetic ammonia factory, in particular to a supercharger system with vent gas recovery and utilization function, which comprises a combined alcohol supercharger and a combined supercharger, wherein the combined alcohol supercharger increases the fine desulfurization gas from a fine desulfurization section and then sends the gas into the combined supercharger, and the gas is sent into an ammonia synthesis process after being pressurized by a first section and a second section of the combined supercharger; the outlet of the alcohol-connecting supercharger, the first section outlet of the combined supercharger and the second section outlet of the combined supercharger are all led out with discharge ports, the discharge ports are connected to a fuel gas pipe network through exhaust pipes, and the exhaust pipes are all provided with recovery valves. The utility model discloses the current apparatus for producing of make full use of, it is with low costs to reform transform, and construction cycle is short, and the construction difficulty is not high, does not need professional technical requirement, only need post staff and workshop management personnel familiar with environment, process flow and the equipment operating parameter after reforming transform can, do not increase management and maintenance cost, satisfied the environmental protection requirement completely, created considerable economic benefits simultaneously.

Description

Supercharger system with emptying gas recycling function

Technical Field

The utility model relates to a recovery of compressor blow-down gas in synthetic ammonia mill specifically is a booster compressor system who possesses blow-down gas recycle function.

Background

In the face of the severe requirement of internal environmental protection situation, various compressors need carry out the pressure release under the parking operating mode in the synthetic ammonia mill, and the gas of emission seriously influences the air quality to often cause small-size air station to detect data to exceed standard, in order effectively to improve the air quality, the continuous stable production of guarantee mill advocates green production, the utility model discloses the current device condition of make full use of does not do big transformation, takes the measure to retrieve the blow-down gas of compressor.

Disclosure of Invention

To the problem that the air quality is influenced in the unloading of parking operating mode and synthetic ammonia feed gas replacement influences the air quality in the stage of driving, the utility model provides a possess booster compressor system of unloading recycle function.

The utility model discloses an adopt following technical scheme to realize: a supercharger system with a vent gas recycling function comprises a combined alcohol supercharger and a combined supercharger, wherein the combined alcohol supercharger pressurizes a fine desulfurization gas from a fine desulfurization section and then sends the pressurized fine desulfurization gas into the combined supercharger, and the pressurized fine desulfurization gas is sent into an ammonia synthesis process after being pressurized by a first stage and a second stage of the combined supercharger; the export of alling oneself with mellow wine booster compressor export, one section export of joint booster compressor, two-stage process export have all been drawn forth the discharge port, and one section export of alling oneself with mellow wine booster compressor, one section export of joint booster compressor, two-stage process export insert the atmosphere through the exhaust pipe line usually, the utility model discloses exactly, increase the discharge port at all levels of booster compressor and increase the exhaust pipe line all the way and insert fuel gas pipe network, be equipped with the recovery valve on the exhaust pipe line all the way of increase, the exhaust pipe line through the increase that will shut down the pressure release gas of operating mode retrieves fuel.

Foretell booster compressor system that possesses unloading gas recycle function, the branch pipe has still been drawn forth to the two-stage outlet of joint booster compressor, and this branch pipe inserts allies oneself with an alcohol booster compressor inlet manifold, is provided with the valve on the branch pipe. In order to meet the requirements of CO and CO in the raw material gas composition of ammonia synthesis₂The concentration requirement is that the gas sent to synthesis needs to be replaced, a set of loop device is added at the second-stage outlet through simple transformation, and the high-concentration CO gas in the starting process is returned to the alcohol-connecting supercharger for utilization.

In the supercharger system having the function of recycling the vent gas, the discharge port is DN 25.

The utility model discloses the current apparatus for producing of make full use of, it is with low costs to reform transform, and construction cycle is short, and the construction difficulty is not high, does not need professional technical requirement, only need post staff and workshop management personnel familiar with environment, process flow and the equipment operating parameter after reforming transform can, do not increase management and maintenance cost, satisfied the environmental protection requirement completely, created considerable economic benefits simultaneously.

Drawings

FIG. 1 is a schematic view of air recovery at shut-down, with dashed lines representing added lines.

FIG. 2 is a schematic diagram of the replacement gas recovery of the feed gas for ammonia synthesis during start-up, with the dotted lines representing added piping.

Detailed Description

A technological transformation scheme for recycling exhausted air of a supercharger comprises the following steps: the method is divided into the following 2 parts:

1. air discharge recycling process under shutdown condition

Taking three combined alcohol superchargers and three combined superchargers as examples, part of fine desulfurization gas from a fine desulfurization section is pressurized to 7.9MPa (G) by a combined alcohol compressor at the pressure of 2.95MPa (G) and the temperature of 17 ℃, then enters a first-section inlet of the combined compressor, the pressure is increased to 14.5MPa from 7.9MPa, and the gas is sent to an alcohol alkylation process from a first-section outlet; the hydrocarbon after alcohol alkylation reaction enters the inlet of the second section of the combined supercharger, and is compressed in the second section, the pressure is increased from 13.4MPa to 28.5MPa, and the mixture is sent into the ammonia synthesis procedure with the diameter of 1600 mm.

At present, the 6 superchargers need to be decompressed under normal and abnormal shutdown working conditions so as to ensure the safety of equipment. And the gas of pressure release is discharged into the atmosphere usually, causes serious air pollution, the utility model discloses a following mode is recycled.

DN25 discharge ports led out from the outlet of the alcohol-connecting supercharger, the first-stage outlet of the combined supercharger and the second-stage outlet are respectively connected to a fuel gas pipe network. The discharge amount of less than 10 standard square per hour is controlled, and the stable operation of the three-waste furnace load can be met.

2. Recovery of synthesis ammonia feed gas replacement gas during startup

In order to meet the requirement of the feed gas for synthesizing ammonia in the starting process of the three combined superchargers, the three combined superchargers must meet the requirement of CO + CO₂Less than or equal to 10PPm, and about 3000Nm for emptying replacement of high-pressure cylinder (two-stage combined booster)³The gas is discharged into the atmosphere to cause pollution, so the following reconstruction method is adopted: and a branch manifold is led out from the second-stage outlet of each joint supercharger and then is connected to the inlet manifold of the joint alcohol supercharger.

The utility model discloses usable parking overhaul opportunity bumps the mouth to reforming transform the project, can realize the recovery to booster compressor air release and synthetic ammonia feed gas replacement gas after driving, can satisfy the environmental protection requirement, and the reduction control pollutes, has created economic benefits simultaneously, realizes energy saving and emission reduction requirement.

Claims (3)

1. A supercharger system with a vent gas recycling function comprises a combined alcohol supercharger and a combined supercharger, wherein the combined alcohol supercharger increases the fine desulfurization gas from a fine desulfurization section and then sends the fine desulfurization gas into the combined supercharger, and the fine desulfurization gas is pressurized by a first stage and a second stage of the combined supercharger and then sent into an ammonia synthesis process; the method is characterized in that: the first section and the second section of the outlet of the combined alcohol supercharger and the combined supercharger are provided with discharge ports, the discharge ports are connected to a fuel gas pipe network through an increased exhaust pipeline, and a recovery valve is further arranged on the exhaust pipeline.

2. The system according to claim 1, wherein a branch pipe is further led out from the outlet of the second stage of the combined supercharger, and the branch pipe is connected to the inlet header of the alcohol-combined supercharger, and a valve is arranged on the branch pipe.

3. The booster system with vent gas recycling function of claim 2, characterized in that the discharge port is DN25 discharge port.

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