Jinling Petrochemical Sulfur Recovery Unit Achieves Near-Zero Emissions

China Petrochemical News Network reported on September 13, in the central control room of the No.
5 sulfur recovery unit of Jinling Petrochemical Refining Department 4, the DCS connected to the government showed that the online real-time monitoring data of sulfur dioxide in the flue gas showed 0.
8 mg/m3, which was far below the national limit.
(100 mg/m3)
.

In recent years, as a large-scale oil processing base along the Yangtze River for Sinopec Group, Jinling Petrochemical has resolutely implemented the Yangtze River protection requirements, strictly fulfilled its social responsibilities, guided the overall situation with a green and low-carbon strategy, and steadily improved the level of environmental protection management.
"Near zero emissions" is a new goal for companies to actively participate in the carbon peak and carbon neutral action, and promote companies to demonstrate and set benchmarks on the road of green development
.

At present, in terms of sulfur recovery and treatment, the company combines the characteristics of different devices, continues to apply new technologies, new processes, and new facilities, and continues to tackle key problems from the three breakthrough points of management, optimization, and technology.
The production level of all sulfur recovery and environmental protection devices has been significantly improved.
From January to August, the sulfur dioxide content in the flue gas was "trace", which was close to zero emission
.

Desulfurization with "Claus + post-alkali washing" process

At 10:00 on September 10, 2021, the real-time detection data of sulfur dioxide concentration in Jinling Petrochemical No.
3 sulfur tail gas was 2.
8 mg/m3, which was normal
.
This is the effect brought about by the "Claus + post-alkali washing" process adopted by the device

The company’s No.
3 sulfur recovery unit adopts Italian KTI’s process desulfurization technology, which mainly includes Claus sulfur production, RAR (reduction, absorption, recycling) and tail gas incineration.
The sulfur recovery rate exceeds 99.
9%, although it can desulfurize In addition to most of the sulfur dioxide in production, it still cannot achieve "near zero emissions"
.

To this end, the company conducts technical transformations through sub-investigation, inspection, and demonstration
.
The domestically-made desulfurization technology is used to build a new tail gas upgrading facility, and the "post-alkali washing" process is installed, which has a significant desulfurization effect

"The post-alkali washing process is stable and the production reliability is high.
The changes in the previous process have little effect on desulfurization.
After the tail gas is treated, the sulfur dioxide content is less than 10 mg/m3
.
" Zhou Hao, deputy director of the fourth work zone of the second oil refining department of the company, introduced

In addition, the desulfurization solvent of the No.
3 sulfur recovery unit contains a lot of ineffective impurities and thermally stable salts after long-term operation, causing a series of problems such as equipment corrosion, solvent foaming, and substandard quality of refined products.
The company has added an amine purification system , After the desulfurization solvent is purified, the thermally stable salt concentration in it is reduced by 70%, which improves the desulfurization effect
.

　　Statistics show that from January to August, the average sulfur dioxide content in the flue gas of the device was less than 1 mg/m3, almost all sulfur dioxide was removed, and the cumulative production of sulfur was more than 64,000 tons
.

　　"Smoke window + cooling tower" two-in-one technology for desulfurization

　　On September 10, Jinling Petrochemical's No.
4 sulfur plant was in stable operation for 1,000 days after the environmental improvement and upgrading.
The online real-time data at 9 o'clock showed that the sulfur dioxide concentration in the flue gas was 4.
8 mg/m3, and the plant maintained green and clean production
.

　　In the environmental protection renovation project implemented by the company, the flue gas desulfurization system of the No.
4 sulfur device adopts the high-efficiency wet desulfurization absorption process and the "smoke tower integration" technology.
The "smoke tower integration" is to change the conventional smoke window to "smoke window + cooling" The “tower” combines two into one, and compared with traditional smokestacks, the project structure is tight, the risk of renovation is small, and it saves energy and electricity
.
At the same time, the flue gas is treated by incineration, alkaline washing purification and desulfurization slurry two-stage aeration treatment, and the sulfur dioxide in it is basically recovered

　　Since the No.
4 sulfur device was put into operation in June 2017, through 24-hour online real-time monitoring with the Nanjing Municipal Ministry of Environmental Protection, the device has been operating stably, and the sulfur dioxide concentration in the flue gas has been maintained within 10 mg/m3, and it has basically achieved "near Zero emissions"
.

　　Application of "Ammonia Method + Thiamine Production" New Domestic Desulfurization Technology

　　"This is the No.
5 sulfur recovery unit, which adopts China's independent intellectual property rights ammonia desulfurization technology, and the effect is very good!" On September 10, Jinling Petrochemical Refining Division 4 manager Zhao Yong introduced at the site on No.
51
.
At 11:22, the online environmental monitoring system showed that the sulfur dioxide content in the flue gas was 0.

　　Jinling Petrochemical's No.
5 sulfur plant with an annual processing capacity of 150,000 tons is an environmentally-friendly supporting device for the company's annual production of 2 million tons of residual oil hydrogenation
.
On November 14, 2018, the entire process of introducing sour gas, sulfur production and desulfurization units of the newly built device was completed, and qualified sulfur products were produced.

　　The No.
5 sulfur plant uses ammonia desulfurization technology with completely independent intellectual property rights to treat tail gas.
This is the first application of a sulfur recovery plant in a petrochemical enterprise
.
Its characteristic is to use the waste ammonia produced in the refining and chemical production process as the raw material to remove sulfur and recover the sulfur dioxide in the tail gas.

　　At the same time, the completion and commissioning of the device also completely solved the company's acid gas balance problem, eliminating worries about the company's large-scale production, and further improving the company's environmental protection management level