CN214299309U

CN214299309U - Device for preparing hydrogen-nitrogen synthesis gas from desorption gas

Info

Publication number: CN214299309U
Application number: CN202023251913.0U
Authority: CN
Inventors: 宋如昌; 李亚军; 高玉安; 宋涛; 高宏寅
Original assignee: Shaanxi Dongxinyuan Chemical Co ltd
Current assignee: Shaanxi Dongxinyuan Chemical Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-28
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a desorption gas preparation hydrogen nitrogen synthetic gas device has solved the technological cost that adopts empty technology separation nitrogen gas to come synthetic ammonia among the prior art higher, the higher technical problem of safe risk of empty production pure oxygen warehousing and transportation. The device for preparing the hydrogen-nitrogen synthesis gas from the desorption gas comprises a pressure boosting device, a desulfurization device, a deoxidation device, a pressure swing adsorption device and an ammonia synthesis device which are sequentially communicated; the inlet of the pressure boosting device is used for receiving purified desorption gas generated in the hydrogen production and purification stage of the raw gas; an adsorbent is arranged in the pressure swing adsorption device, and product gas flows out of an outlet of the pressure swing adsorption device; the ammonia synthesis device can synthesize the hydrogen and the nitrogen in the product gas into ammonia. By adopting the device for preparing the hydrogen-nitrogen synthesis gas by using the desorption gas, the investment and the operation cost of an air separation device are reduced, and the safety risk of storage and transportation of pure oxygen produced by air separation is avoided.

Description

Device for preparing hydrogen-nitrogen synthesis gas from desorption gas

Technical Field

The utility model relates to an ammonia preparation technical field especially relates to a desorption gas preparation hydrogen nitrogen synthetic gas device.

Background

The semi-coke is prepared by low-temperature dry distillation of high-quality Jurasol clean coal blocks produced in Shenfu coal fields, and has the characteristics of high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum content, low sulfur content and low phosphorus content.

The coal briquette can generate raw coke oven gas in the process of dry distillation, and the raw coke oven gas mainly contains hydrogen, carbon monoxide, carbon dioxide, nitrogen, oxygen, methane, hydrocarbons and the like. Coal chemical enterprises generally use raw coke oven gas as a raw material and adopt a process of purification after pressure swing adsorption to prepare hydrogen. The desorbed gas produced by the hydrogen production from the raw gas is generally used as fuel.

However, in the conventional process for synthesizing ammonia, nitrogen gas is separated from air and then reacted with hydrogen gas to synthesize ammonia. The process cost for synthesizing ammonia by separating nitrogen by adopting the air separation process is higher, and the safety risk of storage and transportation of pure oxygen produced by air separation is higher.

Disclosure of Invention

The embodiment of the utility model provides a through providing a desorption gas preparation hydrogen nitrogen synthetic gas device, it is higher to have solved the technological cost that adopts the air separation technology separation nitrogen gas to come synthetic ammonia among the prior art, and the higher technical problem of safe risk of air separation production pure oxygen warehousing and transportation.

The embodiment of the utility model provides a desorption gas preparation hydrogen nitrogen synthetic gas device, including booster unit, desulphurization unit, deoxidation device, pressure swing adsorption equipment and synthetic ammonia device that communicate in proper order;

the inlet of the pressure boosting device is used for receiving purified desorption gas generated in the hydrogen production and purification stage of raw coke oven gas, and the pressure boosting device can boost the purified desorption gas to a preset pressure value; the deoxidation device can perform fine deoxidation on the purification desorption gas, and the desulphurization device can perform fine desulphurization on the purification desorption gas;

an adsorbent is arranged in the pressure swing adsorption device, the purified desorbed gas can be subjected to pressure swing adsorption to remove carbon monoxide and carbon dioxide, and a product gas flows out of an outlet of the pressure swing adsorption device;

the ammonia synthesis device can synthesize the hydrogen and the nitrogen in the product gas into ammonia.

In a possible implementation manner, the device for preparing hydrogen-nitrogen synthesis gas from desorbed gas further comprises a refining and decarbonizing device, wherein the refining and decarbonizing device is arranged between the pressure swing adsorption device and the ammonia synthesis device to refine the product gas.

In one possible implementation, the fine decarbonization apparatus comprises a shift, methanation or methanol washing apparatus.

In a possible implementation manner, the ammonia synthesis device is also communicated with an external hydrogen source, and the product gas and the external hydrogen are mixed before the inlet of the ammonia synthesis device to form a mixed gas.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:

the device for preparing the hydrogen-nitrogen synthesis gas by the desorption gas comprises a pressure boosting device, a desulfurization device, a deoxidation device, a pressure swing adsorption device and a synthesis ammonia device which are sequentially communicated; this desorption gas preparation hydrogen nitrogen synthetic gas device is at specific during operation, the booster unit is after the purification desorption gas steps up to preset pressure value, desulphurization unit carries out the fine desulfurization to the purification desorption gas and handles, the deoxidation device carries out the fine deoxidation to the purification desorption gas, can get rid of hydrogen sulfide and oxygen among the purification desorption gas, then pressure swing adsorption device carries out pressure swing adsorption to the purification desorption gas, can get rid of carbon monoxide and carbon dioxide among the purification desorption gas, and then obtain the product gas, mainly include nitrogen gas, hydrogen, methane in the product gas, then synthesize ammonia with the product gas. By adopting the device for preparing the hydrogen-nitrogen synthesis gas by using the desorption gas, the investment and the operation cost of an air separation device are reduced, and the safety risk of storage and transportation of pure oxygen produced by air separation is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of an apparatus for preparing hydrogen-nitrogen synthesis gas from desorbed gas according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the device for preparing hydrogen-nitrogen synthesis gas from desorbed gas according to the embodiment of the present invention.

Icon: 10-a booster device; 20-a desulfurization unit; 30-a deoxygenation device; 40-a pressure swing adsorption unit; 50-an ammonia synthesis plant; 60-refining decarbonization device.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

The embodiment of the present invention provides a device for preparing hydrogen-nitrogen synthesis gas by using desorbed gas, and please refer to fig. 1 and fig. 2 together.

Fig. 1 shows a specific embodiment of the device for preparing hydrogen-nitrogen synthesis gas from desorbed gas, which comprises a pressure boosting device 10, a desulfurization device 20, a deoxidation device 30, a pressure swing adsorption device 40 and an ammonia synthesis device 50 which are sequentially communicated. Wherein, the inlet of booster unit 10 is used for receiving the purification desorption gas that raw coke oven gas produced in the hydrogen-making purification stage, and booster unit 10 can step up the purification desorption gas to preset pressure value. The deoxidation device 30 can perform fine deoxidation on the purified desorption gas, and the desulphurization device 20 can perform fine desulphurization on the purified desorption gas. The pressure swing adsorption device 40 is internally provided with an adsorbent which can perform pressure swing adsorption on the purified desorbed gas to remove carbon monoxide and carbon dioxide, and the product gas flows out of the outlet of the pressure swing adsorption device 40. The ammonia synthesizing apparatus 50 is capable of synthesizing ammonia from hydrogen and nitrogen in the product gas.

When the device for preparing the hydrogen-nitrogen synthesis gas from the desorbed gas works specifically, after the purified desorbed gas is pressurized to a preset pressure value by the pressurizing device 10, the purified desorbed gas is subjected to fine desulfurization treatment by the desulfurizing device 20, the purified desorbed gas is subjected to fine deoxidation by the deoxidizing device 30, hydrogen sulfide and oxygen in the purified desorbed gas can be removed, then the purified desorbed gas is subjected to pressure swing adsorption by the pressure swing adsorption device 40, carbon monoxide and carbon dioxide in the purified desorbed gas can be removed, and further the product gas is obtained, wherein the total content of hydrogen and nitrogen in the product gas accounts for 99.99% (volume fraction) of the product gas, and then the product gas is synthesized into ammonia. By adopting the device for preparing the hydrogen-nitrogen synthesis gas by using the desorption gas, the investment and the operation cost of an air separation device are reduced, and the safety risk of storage and transportation of pure oxygen produced by air separation is avoided.

When the desorbed gas is subjected to pressure swing adsorption, the desorbed gas is introduced into the pressure swing adsorption device 40, and the pressure swing adsorption device 40 contains an adsorbent capable of adsorbing carbon monoxide and carbon dioxide in the desorbed gas. Since the molecular weight of carbon monoxide and the molecular weight of nitrogen are both 28, carbon monoxide is adsorbed by using a conventional adsorbent, nitrogen is also adsorbed, and nitrogen and carbon monoxide cannot be effectively separated. The adsorbent used for pressure swing adsorption of the desorbed gas provided by the embodiment of the invention comprises activated carbon, a molecular sieve and a cuprous chloride loaded adsorbent.

The cuprous chloride supported adsorbent has a strong adsorption effect on carbon monoxide molecules and a weak adsorption effect on nitrogen molecules, and carbon monoxide in desorbed gas can be removed by using the cuprous chloride supported adsorbent.

The cuprous chloride supported adsorbent in the embodiment refers to a molecular sieve loaded with cuprous chloride. For example, the cuprous chloride supported adsorbent can be prepared by mixing CuCl and gamma-Al₂O₃And 4A, 13X, NaY, Cu + Y and other molecular sieves are respectively mixed and heated to obtain the adsorbent.

The activated carbon and the molecular sieve in the adsorbent used in the pressure swing adsorption can effectively remove the carbon dioxide in the desorbed gas.

Fig. 2 shows another embodiment of the apparatus for producing hydrogen-nitrogen synthesis gas by suction, which comprises a purification and decarbonization apparatus 60 in addition to the configuration shown in fig. 1, wherein the purification and decarbonization apparatus 60 is disposed between the pressure swing adsorption apparatus 40 and the ammonia synthesis apparatus 50 to purify the product gas.

After the product gas passes through the refining and decarbonizing device 60, the content of carbon monoxide and carbon dioxide in the product gas is further reduced, and the product gas can meet the requirement of synthetic ammonia.

Specifically, the refining decarbonizing device 60 includes a shift, methanation, or methanol washing device.

Referring to both embodiments shown in fig. 1 and 2, the ammonia synthesis unit 50 is also in communication with an external source of hydrogen, and the product gas and the external hydrogen are mixed before the inlet of the ammonia synthesis unit 50 to form a mixed gas.

After the product gas is directly used for synthesizing ammonia, a large amount of unreacted nitrogen exists in the ammonia gas, so that the waste of the nitrogen gas is caused, and the purity of the ammonia gas is low. Introducing hydrogen into the product gas from the outside to ensure that the hydrogen-nitrogen ratio in the product gas is 3: 1, then synthesizing ammonia, namely fully utilizing nitrogen and greatly improving the purity of ammonia. Wherein, the externally supplemented hydrogen can be hydrogen prepared from raw coke oven gas, so that the raw coke oven gas can be fully utilized.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the present invention.

Claims

1. The device for preparing the hydrogen-nitrogen synthesis gas from the desorption gas is characterized by comprising a pressure boosting device, a desulfurization device, a deoxidation device, a pressure swing adsorption device and an ammonia synthesis device which are sequentially communicated;

2. The apparatus for preparing hydrogen-nitrogen synthesis gas from desorbed gas as claimed in claim 1, further comprising a refining decarbonization apparatus disposed between the pressure swing adsorption apparatus and the ammonia synthesis apparatus to refine the product gas.

3. The apparatus for preparing hydrogen-nitrogen synthesis gas from desorbed gas as claimed in claim 2, wherein the refining decarbonization apparatus comprises shift conversion, methanation or methanol washing apparatus.

4. The apparatus for preparing hydrogen and nitrogen by using desorbed gas as claimed in claim 1, wherein the apparatus is further connected to an external hydrogen source, and the product gas and the external hydrogen are mixed before the inlet of the apparatus to form a mixed gas.