CN-224208001-U - Nitric acid preparation facilities of simulation earth early atmospheric photochemical reaction

CN224208001UCN 224208001 UCN224208001 UCN 224208001UCN-224208001-U

Abstract

The utility model discloses a nitric acid preparation device for simulating an earth early atmospheric photochemical reaction, which comprises an ultraviolet photochemical reaction system, a reaction air source supply system, a water vapor generator and a nitric acid freezing collector, wherein the ultraviolet photochemical reaction system comprises an ultraviolet light source and a reaction chamber, the ultraviolet light source is used for providing ultraviolet light required by the reaction in the reaction chamber, the reaction air source supply system is communicated with the reaction chamber and is used for supplying gas required by the ultraviolet chemical reaction to generate nitric acid in the reaction chamber, the water vapor generator is used for providing water vapor to the reaction chamber, the water vapor generator is connected with the reaction chamber, and the nitric acid freezing collector is connected with the reaction chamber and is used for collecting nitric acid generated by the photochemical reaction in the reaction chamber. The utility model realizes the preparation of nitric acid by simulating the early atmospheric photochemical reaction of the earth.

Inventors

SUN PENGCHENG
LI YANHE
FAN CHANGFU
HU BIN
GAO JIANFEI

Assignees

中国地质科学院矿产资源研究所

Dates

Publication Date: 20260508
Application Date: 20250416

Claims (10)

1. A nitric acid production apparatus for simulating an earth early atmospheric photochemical reaction, comprising: The ultraviolet photochemical reaction system comprises an ultraviolet light source and a reaction chamber, wherein the reaction chamber is used as a place for generating nitric acid by ultraviolet light chemical reaction, and the ultraviolet light source is used for emitting ultraviolet light into the reaction chamber; The reaction gas source supply system is connected with the reaction chamber and is used for supplying gas required by ultraviolet light chemical reaction to generate nitric acid into the reaction chamber so as to simulate the early earth atmosphere, and is provided with a first gas supply device, a second gas supply device and a third gas supply device, wherein the first gas supply device is used for supplying mixed gas of NO x and N 2 to the reaction chamber, the second gas supply device is used for supplying CO 2 to the reaction chamber, and the third gas supply device is used for supplying pure O 2 or mixed gas of O 2 and He to the reaction chamber; The water vapor generator is connected with the reaction chamber and is used for providing water vapor for the reaction chamber so as to simulate the humidity of the earth early atmosphere; and the nitric acid freezing collector is connected with the reaction chamber and is used for collecting nitric acid generated by photochemical reaction in the reaction chamber.
2. The nitric acid production apparatus for simulating an earth early atmospheric photochemical reaction according to claim 1, wherein said reaction chamber is a stainless steel drum having one end opened and the other end closed.
3. The nitric acid preparation device for simulating early earth atmosphere photochemical reaction according to claim 2, wherein the reaction chamber is provided with an ultraviolet light inlet, a reaction gas inlet, a water vapor inlet and a product outlet, the axis of the stainless steel drum is horizontally arranged, one end opening of the stainless steel drum is used as the ultraviolet light inlet, the ultraviolet light inlet and the product outlet are arranged at two axial ends of the stainless steel drum, and the reaction gas inlet and the water vapor inlet are arranged on the side wall of the stainless steel drum.
4. A nitric acid production plant according to claim 3, wherein said reaction chamber is provided with first heating means configured to control the temperature in the reaction chamber at 65±0.5 ℃.
5. The nitric acid preparation device for simulating an earth early atmospheric photochemical reaction according to claim 3, wherein the water vapor generator comprises a water tank and a helium source, ultrapure water is filled in the water tank, a bottom helium inlet of the water tank is connected with the helium source through a helium gas path, and a top water vapor outlet of the water tank is connected with the water vapor inlet through a water vapor path.
6. The nitric acid production apparatus for simulating an earth early atmospheric photochemical reaction according to claim 5, wherein a second heating means is provided outside the water tank, and is configured to maintain ultrapure water in the water tank at 25 to 65 ℃.
7. The nitric acid preparation device for simulating an earth early atmospheric photochemical reaction according to claim 1, wherein the nitric acid freezing collector comprises a cold source container and a collecting pipe, the top of the cold source container is opened, and the cold source container is filled with a freezing liquid at-50+/-5 ℃.
8. The nitric acid production apparatus for simulating an early earth atmospheric photochemical reaction according to claim 7, wherein a product supply pipe extending to the bottom of the collecting pipe is provided at the top of the collecting pipe, a product discharge pipe is provided at the upper side wall of the collecting pipe, and the product outlet is connected to the product supply pipe via a stainless steel pipe.
9. The nitric acid production apparatus for simulating an early earth atmospheric photochemical reaction according to claim 8, wherein the top of the product feed pipe is provided with a reduced diameter section extending upward, and the reduced diameter section has an inner diameter smaller than that of the product feed pipe.
10. The nitric acid production apparatus for simulating an early earth atmospheric photochemical reaction of claim 1, wherein said ultraviolet light source is a vacuum ultraviolet light source of the type L11798.

Description

Nitric acid preparation facilities of simulation earth early atmospheric photochemical reaction Technical Field The utility model belongs to the technical field of earth science research, and particularly relates to a nitric acid preparation device for simulating earth early atmospheric photochemical reaction. Background It is currently believed that the earth's early atmospheric oxygen concentration is less than one ten thousandth of the modern atmospheric oxygen level. The rise of the atmospheric oxygen concentration is a precondition for the birth of the life of the earth and the formation of a habitable earth. The oxidative components such as H 2O2、O2 produced by ultraviolet photolysis of oxygen-containing gaseous components such as H 2O、CO2 in the atmosphere may be a significant source of oxygen in the atmosphere and in the ocean prior to early life of the earth, but lack direct geological evidence. Atmospheric nitrate is the mineral with the largest oxygen isotope non-quality fractionation (delta 17 O) on earth and is an effective index for tracing the sensitivity of atmospheric photochemical process. Nitrate produced by photochemical reactions in modern oxygen-enriched atmospheres is widely available, but it is not clear whether similar uv-light chemical reactions exist in the early oxygen-depleted atmosphere of the earth, and whether the produced nitrate has oxygen isotopes or not, with non-quality fractionation. However, the experimental apparatus and method in the prior art cannot simulate the process of generating nitrate by the photochemical reaction in the early-stage anaerobic/anaerobic atmosphere of the earth, so that it is highly desirable to provide a nitric acid preparation apparatus simulating the photochemical reaction in the early-stage atmosphere of the earth. Disclosure of utility model In view of the above analysis, the present utility model aims to provide a nitric acid preparation device for simulating an early earth atmospheric photochemical reaction, which realizes the process of simulating an early earth anaerobic/anaerobic atmospheric photochemical reaction to generate nitrate. The purpose of the utility model is realized in the following way: a nitric acid production apparatus simulating an earth early atmospheric photochemical reaction, comprising: The ultraviolet photochemical reaction system comprises an ultraviolet light source and a reaction chamber, wherein the reaction chamber 12 is used as a place for generating nitric acid by ultraviolet light chemical reaction, and the ultraviolet light source is used for emitting ultraviolet light into the reaction chamber; The reaction gas source supply system is connected with the reaction chamber and is used for supplying gas required by ultraviolet light chemical reaction to generate nitric acid to simulate the early earth atmosphere, and is provided with a first gas supply device, a second gas supply device and a third gas supply device, wherein the first gas supply device is used for supplying mixed gas of NO x and N 2 to the reaction chamber, the second gas supply device is used for supplying CO 2 to the reaction chamber, and the third gas supply device is used for supplying pure O 2 or mixed gas of O 2 and He to the reaction chamber. The water vapor generator is connected with the reaction chamber and is used for providing water vapor for the reaction chamber so as to simulate the humidity of the earth early atmosphere; and the nitric acid freezing collector is connected with the reaction chamber and is used for collecting nitric acid generated by photochemical reaction in the reaction chamber. Further, the reaction chamber adopts a stainless steel drum with one end open and the other end closed. The reaction chamber is further provided with an ultraviolet light inlet, a reaction gas inlet, a vapor inlet and a product outlet, the axis of the stainless steel barrel is horizontally arranged, one end opening of the stainless steel barrel is used as the ultraviolet light inlet, the ultraviolet light inlet and the product outlet are arranged at two axial ends of the stainless steel barrel, and the reaction gas inlet and the vapor inlet are arranged on the side wall of the stainless steel barrel. Further, the reaction chamber is provided with a first heating device configured to control the temperature within the reaction chamber at 65±0.5 ℃. Further, the vapor generator comprises a water tank and a helium source, ultrapure water is filled in the water tank, a helium inlet at the bottom of the water tank is connected with the helium source through a helium gas path, and a vapor outlet at the top of the water tank is connected with the vapor inlet through a vapor path. Further, a second heating device is provided outside the water tank, and is configured to maintain the ultrapure water in the water tank at 25-65 ℃. Further, the nitric acid freezing collector comprises a cold source container and a collecting pipe, wherein the top o