阅读说明：本技术 一种适用于重整氢气净化的方法和装置 (method and device suitable for purifying reformed hydrogen ) 是由 杨强 钱运东 黄燎云 李冰冰 张毅文 于 2018-05-28 设计创作，主要内容包括：本发明涉及一种适用于重整氢气净化的方法和装置。该方法主要对重整工艺中重整氢气进行处理,对重整氢气进行深度净化,其特征在于,所述的重整氢气净化装置,包括洗涤器和气液分离器,所述洗涤器包括多级文丘里洗涤器,所述每级文丘里洗涤器由气体入口、渐缩段、喉管段、渐扩段、气体出口以及洗涤液入口、喷嘴等组成,所述气液分离器由多级气液分离模块及分离器壳体组成。所述重整氢气先经过文丘里洗涤器洗涤去除杂质气体,后经过多级气液分离模块脱除洗涤液,能够大大降低有害杂质气体的含量,从而实现重整氢气体的净化处理,该装置和方法经济、高效、适应性强且结构简单。(The present invention relates to a method and apparatus suitable for purification of reformed hydrogen. The method is mainly used for treating reformed hydrogen in a reforming process and deeply purifying the reformed hydrogen and is characterized in that the reformed hydrogen purification device comprises a scrubber and a gas-liquid separator, the scrubber comprises multiple stages of Venturi scrubbers, each stage of Venturi scrubber comprises a gas inlet, a reducing section, a throat section, a gradually expanding section, a gas outlet, a washing liquid inlet, a nozzle and the like, and the gas-liquid separator comprises multiple stages of gas-liquid separation modules and a separator shell. The reformed hydrogen is washed by the Venturi scrubber to remove the impurity gases, and then the washing liquid is removed by the multi-stage gas-liquid separation module, so that the content of harmful impurity gases can be greatly reduced, and the purification treatment of the reformed hydrogen is realized.)

1. an apparatus suitable for reforming hydrogen purification, comprising a scrubber and a gas-liquid separator, characterized in that: the scrubber includes multistage venturi scrubber, every grade venturi scrubber comprises gas inlet, convergent section, throat pipe section, divergent section, gas outlet and washing liquid inlet, nozzle, vapour and liquid separator comprises multistage gas-liquid separation module and separator casing.

2. The apparatus of claim 1, wherein the multiple venturi scrubbers are arranged in series, the series arrangement having a first venturi scrubber outlet connected to a second venturi scrubber gas inlet and a last venturi scrubber outlet connected to a separator inlet.

3. The device of claim 1, wherein the venturi scrubber has a tapered section with a taper angle of 24-29 °, a diverging section with a diverging angle of 5-8 °, and a throat length of 0.5-2.2 times the throat diameter.

4. The apparatus of claim 1, wherein the nozzle has a spray angle of 55 to 150 ° and the distance between the forward end of the nozzle and the throat entrance is 0.1 to 1.5 times the throat diameter.

5. The apparatus of claim 1, wherein the inertial separation sparger module is mounted at an inlet of the gas-liquid separator to uniformly distribute the gas and separate larger liquid droplets or solid particles entrained in the gas.

6. the device as claimed in claim 1, wherein the gas-liquid deep separation module comprises a high-efficiency blade gas-liquid separation module and a nanofiber hybrid high-efficiency gas-liquid separation module, and is used for deeply separating droplets entrained in gas.

7. The method is characterized in that the reformed hydrogen is washed by a Venturi scrubber to remove impurity gases, and then enters a multi-stage gas-liquid separation module to remove washing liquid, so that the high-efficiency purification treatment of the reformed hydrogen is realized; the method comprises the following specific steps:

(1) After entering from the inlet of the primary venturi wet scrubber, firstly reducing the pressure and accelerating the hydrogen to 40-60 m/s, and atomizing the washing liquid (water) injected from the throat part by high-speed gas;

(2) then, the hydrogen chloride gas in the gas flow is quickly absorbed by the washing liquid, and the gas pressure is gradually recovered by a divergent section arranged behind the throat; along with the increase of the pressure, the solubility of the hydrogen chloride gas in water is increased, and the washing liquid further absorbs the hydrogen chloride gas;

(3) After the absorption of the hydrogen chloride gas is finished, the reformed hydrogen gas enters a secondary Venturi scrubber, and the same washing process is carried out on a secondary Venturi reducing section, a throat section and a gradually expanding section so as to increase the retention time and further improve the washing effect;

(4) The large water drops in the reformed hydrogen flow are separated through an inertia separation distributor, the washing liquid which absorbs hydrogen chloride gas in the washing process is separated to a liquid accumulation area of the tank body, the small water drops carried in the gas flow are deeply separated through a combined high-efficiency blade separator and a nano mixed gas-liquid separator, the separated liquid phase flows to a liquid accumulation area at the bottom through gravity and a drainage tube, and the purified gas phase is discharged from the top.

8. The method according to claim 7, wherein the reformed hydrogen gas contains an impurity gas component to be removed, and the impurity gas component is absorbed by the washing liquid at a volume ratio of not less than 300, the volume ratio being a volume of the impurity gas absorbed at a saturation state per volume of the absorption liquid at normal temperature and normal pressure.

9. a process according to claim 7, wherein the amount of scrubbing liquid is the volume of contaminant gas to be treated divided by the absorption volume ratio, which is the volume of contaminant gas at which saturation of absorption is achieved per volume of absorption liquid at the operating pressure and temperature.

10. The method of claim 7, wherein the reformed hydrogen gas undergoes an acceleration followed by a deceleration process as it passes through a convergent section, a throat section, and a divergent section in each stage of the venturi scrubber.

11. The method of claim 10, wherein the venturi scrubber has an inlet gas velocity of 8 to 22m/s, a throat gas velocity of 35 to 65m/s, and an outlet gas velocity of 8 to 22 m/s.

12. The method of claim 11, wherein the high velocity throat gas stream atomizes the scrubbing liquid sprayed through the nozzle, and the atomized droplets have an average size of less than 80 microns.

Technical Field

The invention relates to the technical field of gas purification, in particular to a method and a device suitable for purifying reformed hydrogen.

background

In the continuous reforming, measures such as chlorine injection according to the water-chlorine equilibrium condition in the system and chlorination after the catalyst is regenerated are needed to maintain the chlorine content on the catalyst, wherein the lost chlorine element is mostly in the form of hydrogen chloride in the reformed hydrogen. In recent years, chlorine corrosion accidents occur in devices using reformed hydrogen many times, and the accident that the device is shut down, such as blockage of a heat exchanger perforation system by NH4Cl and coking of a furnace tube, occurs occasionally, so that dechlorination treatment of the reformed hydrogen is required.

Hydrogen chloride (HCl) gas is a colorless and strongly pungent gas, and 1 volume of water can dissolve about 400 volumes of HCl gas. Based on the principle that hydrogen chloride is easily dissolved in water, water is often adopted to directly absorb hydrogen chloride gas, but the direct absorption is easy to desorb, and the absorbed water is acidic, so that the subsequent treatment is not facilitated.

The patent: CN 206334508U discloses a spray tower of hydrogen chloride absorption process, which adopts a two-stage spray mode to improve the hydrogen chloride absorption efficiency, and has larger equipment volume, complex structure and longer processing time; the patent: CN 205127685U discloses a hydrogen chloride tail gas purification device, which comprises a reaction kettle, wherein the device has large volume and complex structure;

Therefore, there is a need to improve the prior art by using a gas treatment method that is simple in structure, high in treatment efficiency, and low in treatment cost.

Disclosure of Invention

To overcome the above-mentioned deficiencies of the prior art, the present invention provides a method and apparatus for purification of reformed hydrogen.

The technical scheme adopted by the invention is that a multi-stage Venturi is adopted to enable impurity gas in reformed hydrogen to be absorbed by washing liquid to the maximum extent through a series structure; by adopting the multi-stage gas-liquid separation module, the reformed hydrogen after washing can be subjected to deep liquid removal, so that the washing liquid is prevented from being carried in the purified reformed hydrogen.

In order to achieve the purpose, the invention provides a scheme suitable for reforming hydrogen purification treatment, which specifically comprises the following steps:

A method for reforming hydrogen purification process comprising the steps of:

(1) after entering from the inlet of the primary venturi wet scrubber, firstly reducing the pressure and accelerating the hydrogen to 40-60 m/s, atomizing the washing liquid (water) injected from the throat part by high-speed gas, and sharply increasing the gas-liquid contact area;

(2) Then, the hydrogen chloride gas in the gas flow is quickly absorbed by the washing liquid, and the gas pressure is gradually recovered by a divergent section arranged behind the throat; with the increase of the pressure, the solubility of the hydrogen chloride gas in water is increased, and the washing liquid further absorbs the hydrogen chloride gas.

(3) After the absorption of the hydrogen chloride gas is finished, the reformed hydrogen gas enters a secondary Venturi scrubber, and the same washing process is carried out on a secondary Venturi reducing section, a throat section and a gradually expanding section so as to increase the retention time and further improve the washing effect.

(4) The large water drops in the reformed hydrogen flow are separated through an inertia separation distributor, the washing liquid which absorbs hydrogen chloride gas in the washing process is separated to a liquid accumulation area of the tank body, the small water drops carried in the gas flow are deeply separated through a combined high-efficiency blade separator and a nano mixed gas-liquid separator, the separated liquid phase flows to a liquid accumulation area at the bottom through gravity and a drainage tube, and the purified gas phase is discharged from the top.

(7) The design scheme combines gas absorption and gas-liquid efficient separation, the equipment is simple and efficient, and the water consumption can be reduced.

The invention has the beneficial effects that:

(1) The multistage Venturi scrubber is adopted in a serial structure, so that the deep purification of reformed hydrogen can be realized, and the consumption of washing liquid is reduced;

(2) the multistage high-efficiency gas-liquid separation module is adopted, the equipment volume can be reduced, high-efficiency washing and separation can be realized by combining a high-efficiency Venturi scrubber, the processing time is greatly reduced, and the processing efficiency is improved.

Drawings

Fig. 1 is a process position and flow diagram of a reformed hydrogen purification apparatus.

FIG. 2 is a schematic diagram of the structure of the venturi scrubber according to example 1;

FIG. 3 is a schematic diagram of a single stage venturi scrubber and separator configuration.

The device comprises a primary venturi inlet 1, a primary venturi liquid injection nozzle 2, a primary venturi throat 3, a secondary venturi inlet 4, a secondary venturi liquid injection nozzle 5, a secondary venturi throat 6, a scrubber and separator connecting flange 7, a make-up liquid inlet 8, a skirt 9, a separator liquid discharge port 10, a liquid level meter interface 11, a liquid level meter interface 12, an inertial separation distributor 13, an air distribution disc 14, a differential pressure meter interface 15, a gas-liquid high-efficiency separation internal part 16, a differential pressure meter interface 17, a separator outlet 18, reformed hydrogen 19, make-up liquid 20, a differential pressure meter 21, a liquid level meter 22, a circulating pump 23, outer drainage 24, an aromatic hydrocarbon extraction device 25, a PSA device 26 and a hydrogenation device 27.

Detailed Description

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are within the scope of the present invention.