Risk early warning method and system for hydrogen leakage

A risk early warning method for hydrogen leakage, comprising:

• obtaining ventilation information of a hydrogen-related area;
• carrying out grid division on a pipeline system of the hydrogen-related area to obtain a gridded pipeline system;
• determining a risk coefficient corresponding to each grid of the gridded pipeline system according to leakage sources of the pipeline system;
• determining a high-risk region by means of a jet cone model according to the risk coefficients;
• wherein the determining a high-risk region by means of a jet cone model according to the risk coefficients specifically comprises:
• determining hydrogen concentration distribution by means of the jet cone model according to the risk coefficients;
• and
• determining the high-risk region according to the hydrogen concentration distribution and the leakage sources;
• wherein
• an empirical formula for determining the hydrogen concentration distribution by means of the jet cone model is
• k
• ⁡
• (
• r
• ,
• z
• )
• =
• P
• 1.7812
• ×
• 10
• -
• 3
• ⁢
• z
• +
• 0.9335
• ⁢
• e
• -
• 0.643
• ×
• 10
• -
• 4
• ⁢
• u
• z
• 2
• ⁢
• r
• 2
• =
• K
• ,
• wherein k is a percentage concentration of hydrogen at a certain point in a space, P is a risk coefficient of a grid, z is a longitudinal distance from a leakage opening, r is a radial distance from the leakage opening, uz is a longitudinal velocity of a jet flow, and K is a risk concentration threshold of hydrogen;
• determining a medium-risk region, a low-risk region and a safe region according to the risk coefficients and the ventilation information;
• wherein the determining a medium-risk region, a low-risk region and a safe region according to the risk coefficients and the ventilation information specifically comprises:
• determining whether a top ventilation quantity in the ventilation information is greater than a gas volume of the high-risk region to obtain a first determination result;
• determining, under the condition that the first determination result is yes, a region of the hydrogen-related area other than the high-risk region as the safe region;
• determining, under the condition that the first determination result is no, the medium-risk region according to the risk coefficient and the ventilation information;
• and
• determining the low-risk region and the safe region according to the medium-risk region, the high-risk region, an internal gas volume of the hydrogen-related area and the ventilation information;
• wherein the determining the low-risk region and the safe region according to the medium-risk region, the high-risk region, an internal gas volume of the hydrogen-related area and the ventilation information specifically comprises:
• determining whether the top ventilation quantity and a non-top ventilation quantity synchronously exist in the ventilation information to obtain a second determination result;
• determining, under the condition that the second determination result is no, a region of the hydrogen-related area other than the high-risk region and the medium-risk region as the low-risk region;
• and
• determining, under the condition that the second determination result is yes, the low-risk region and the safe region according to the internal gas volume of the hydrogen-related area and the ventilation information;
• and
• carrying out risk early warning according to the high-risk region, the medium-risk region, the low-risk region and the safe region.

A risk early warning system for hydrogen leakage, comprising:

• an obtainment module configured to obtain ventilation information of a hydrogen-related area;
• a grid division module configured to carry out grid division on a pipeline system of the hydrogen-related area to obtain a gridded pipeline system;
• a risk coefficient determination module configured to determine a risk coefficient corresponding to each grid of the gridded pipeline system according to leakage sources of the pipeline system;
• a high-risk region determination module configured to determine a high-risk region by means of a jet cone model according to the risk coefficients;
• wherein the high-risk region is determined according to the following steps:
• determining hydrogen concentration distribution by means of the jet cone model according to the risk coefficients;
• and
• determining the high-risk region according to the hydrogen concentration distribution and the leakage sources;
• wherein
• an empirical formula for determining the hydrogen concentration distribution by means of the jet cone model is
• k
• ⁡
• (
• r
• ,
• z
• )
• =
• P
• 1.7812
• ×
• 10
• -
• 3
• ⁢
• z
• +
• 0.9335
• ⁢
• e
• -
• 0.643
• ×
• 10
• -
• 4
• ⁢
• u
• z
• 2
• ⁢
• r
• 2
• =
• K
• ,
• wherein k is a percentage concentration of hydrogen at a certain point in a space, P is a risk coefficient of a grid, z is a longitudinal distance from a leakage opening, r is a radial distance from the leakage opening, uz is a longitudinal velocity of a jet flow, and K is a risk concentration threshold of hydrogen;
• a medium-risk region, low-risk region and safe region determination module configured to determine a medium-risk region, a low-risk region and a safe region according to the risk coefficients and the ventilation information;
• wherein the medium-risk region, the low-risk region and the safe region are determined according to the following steps:
• determining whether a top ventilation quantity in the ventilation information is greater than a gas volume of the high-risk region to obtain a first determination result;
• determining, under the condition that the first determination result is yes, a region of the hydrogen-related area other than the high-risk region as the safe region;
• determining, under the condition that the first determination result is no, the medium-risk region according to the risk coefficient and the ventilation information;
• and
• determining the low-risk region and the safe region according to the medium-risk region, the high-risk region, an internal gas volume of the hydrogen-related area and the ventilation information, which specifically comprises:
• determining whether the top ventilation quantity and a non-top ventilation quantity synchronously exist in the ventilation information to obtain a second determination result;
• determining, under the condition that the second determination result is no, a region of the hydrogen-related area other than the high-risk region and the medium-risk region as the low-risk region;
• and
• determining, under the condition that the second determination result is yes, the low-risk region and the safe region according to the internal gas volume of the hydrogen-related area and the ventilation information;
• and
• an early warning module configured to carry out risk early warning according to the high-risk region, the medium-risk region, the low-risk region and the safe region.