Hydrogen-rich blast furnace ironmaking system based on mass-energy conversion, and production control method therefor

A production control method for a hydrogen-rich blast furnace ironmaking system based on energy-mass conversion,

• the hydrogen-rich blast furnace ironmaking system including a blast furnace and an electrolyzed water system;
• the electrolyzed water system being respectively connected to a hydrogen gas storage tank and an oxygen gas storage tank;
• a gas outlet of the hydrogen gas storage tank being connected to a hydrogen compressor;
• an outlet of the hydrogen compressor being connected to a hydrogen buffer tank;
• the hydrogen buffer tank being connected to a hydrogen injection valve group;
• the hydrogen injection valve group being connected to a hydrogen pre-heating system;
• the hydrogen pre-heating system being connected to a tuyere of the blast furnace or a hydrogen injection device at a lower part of the blast furnace;
• a gas outlet of the oxygen gas storage tank being connected to an oxygen injection valve group, and the oxygen injection valve group being connected to a cold air main pipe of the blast furnace;
• the system also including a hydrogen injection quantity calculation and control system, and control signals of the hydrogen injection quantity calculation and control system being connected to the electrolyzed water system, the hydrogen injection valve group, and the oxygen injection valve group through signal transmission lines;
• the production control method comprising the steps of:
• starting the electrolyzed water system to transport hydrogen and oxygen obtained after electrolysis to the hydrogen gas storage tank and the oxygen gas storage tank, respectively;
• pressuring the hydrogen in the hydrogen gas storage tank with the hydrogen compressor and then letting the pressured hydrogen into the hydrogen buffer tank;
• after adjusting pressure and flow with the hydrogen injection valve group, pre-heating the hydrogen in the hydrogen pre-heating system;
• injecting the pre-heated hydrogen into the blast furnace through the hydrogen injection device;
• and
• after the hydrogen injection quantity calculation and control system implements a calculation formula for the economic benefit of hydrogen injection to determine the hydrogen injection quantity that maximizes the current benefit per ton of iron, synchronously controlling the hydrogen production power of the electrolyzed water system and the hydrogen injection quantity into the blast furnace through control signals;
• wherein the calculation formula for the economic benefit of hydrogen injection is as follows:
• B
• =
• M
• 0
• -
• M
• 1000
• ×
• P
• M
• +
• K
• 0
• -
• K
• 1000
• ×
• P
• K
• +
• η
• ⁢
• V
• BF
• -
• η
• 0
• ⁢
• V
• BF
• η
• ⁢
• V
• BF
• ×
• P
• PI
• +
• (
• C
• 0
• -
• C
• )
• ×
• P
• CO
• 2
• +
• (
• E
• 0
• -
• E
• )
• -
• H
• ×
• P
• H
• 2
• ;
• in the formula:
• B:
• the benefit per ton of iron after hydrogen injection into the blast furnace under the current market conditions, with the unit of yuan per ton of iron (yuan/t);
• M0:
• the coal ratio without hydrogen injection, with the unit of kilograms per ton of iron (kg/t);
• M:
• the coal ratio with hydrogen injection, with the unit of kilograms per ton of iron (kg/t);
• Pm:
• the price of the injected pulverized coal, with the unit of yuan per ton of iron (yuan/t);
• K0:
• the coke ratio without hydrogen injection, with the unit of kilograms per ton of iron (kg/t);
• K:
• the coke ratio with hydrogen injection, with the unit of kilograms per ton of iron (kg/t);
• Pk:
• the price of the charged coke, with the unit of yuan per ton of iron (yuan/t);
• η0:
• the utilization coefficient of the blast furnace without hydrogen injection, with the unit of tons per cubic meter per day [t/(m3·d)];
• η:
• the utilization coefficient of the blast furnace with hydrogen injection, with the unit of tons per cubic meter per day [t/(m3·d)];
• VBF:
• the effective volume of the blast furnace, with the unit of cubic meters (m3);
• PPI:
• the profit per ton of iron, with the unit of yuan per ton (yuan/t);
• C0:
• the direct CO2 emission without hydrogen injection, with the unit of tons per ton of iron (t/t);
• C:
• the direct CO2 emission with hydrogen injection, with the unit of tons per ton of iron (t/t);
• PCO2:
• the carbon-emission trading price, with the unit of yuan per ton of iron (yuan/t);
• E0:
• the operating cost of environmental protection facilities per ton of iron without hydrogen injection, with the unit of yuan per ton of iron (yuan/t);
• E:
• the operating cost of environmental protection facilities per ton of iron with hydrogen injection, with the unit of yuan per ton of iron (yuan/t);
• Ph2:
• the production price of hydrogen, with the unit of yuan per standard cubic meter (yuan/Nm3);
• H:
• the hydrogen injection volume, with the unit of standard cubic meters per ton of iron (Nm3/t).