Submerged combustion vaporizer (SCV) with low nitrogen oxide (NOx) emission

Abstract

The invention discloses a submerged combustion vaporizer (SCV) with low nitrogen oxide (NOx) emission. The SCV with low NOx emission comprises a combustor, a combustion chamber and a flue gas distributor which are communicated in sequence; an air inlet of the combustor communicates with a blower; the flue gas distributor is arranged in a water tank, a heat exchange tube bundle is arranged above the flue gas distributor, a lower inlet of the heat exchange tube bundle is connected with a liquefied natural gas delivery pipeline, and an upper outlet is connected with the natural gas delivery pipeline; the heat exchange tube bundle is submerged in bath liquid in the water tank; a weir flow box is arranged at the periphery of the heat exchange tube bundle, the upper part and lower part of the weir flow box are open; the weir flow box is arranged at the bottom of the water tank through a bracket; the top of the water tank is connected with a demister, and the demister communicates with a chimney; and a spray head is arranged at an inlet of the flue gas distributor, and the spray head is connected with a reducing agent delivery pipeline. According to the SCV with low NOx emission, by introducing a denitration technology, flue gas pollutants generated in the combustion process of the SCV are eliminated, the requirements of national standards and local standards are met, and environmental protection is realized.

Description

technical field [0001] The invention relates to a low-nitrogen oxide emission submerged combustion gasifier, which belongs to the technical field of liquefied natural gas gasifiers. Background technique [0002] As a clean, efficient, convenient and safe energy source, liquefied natural gas (LNG) has become one of the most popular high-quality energy sources in modern society due to its high calorific value, low pollution, and convenient storage and transportation. my country is a country with a large population. With the development of economy, the country's demand for energy continues to grow. The introduction of LNG will play an important role in optimizing my country's energy structure, effectively solving energy shortages, and achieving sustainable economic and social development. [0003] Natural gas is a kind of gas. After being liquefied at (-162°C) atmospheric pressure, it becomes liquefied natural gas. Its volume is about 1 / 625 of the volume of the same amount of g...

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Problems solved by technology

[0004] With the increase in the construction scale of LNG receiving stations and the continuous improvement of environmental protection requirements, especially under the background of the integration of environmental regulation and co-governance requirements in Beijing, Tianjin and Hebei, the existing domestic and foreign SCV technologies have gradually become difficult to meet the needs of LNG receiving stations in these regions. SCV design requirements during construction, Beijing local standard "Boiler Air Pollutant Emission Standard DB11 / 139-2015" requires a new gas-fired boiler nitrogen oxide emission concentration limit of 30mg / Nm 3 , Tianjin local standard "Boiler Air Pollutant Emission Standard DB12 / 151-2016" requires a limit of 80mg / Nm 3 , Hebei area "Boiler Air Pollutant Emission Standard (Second Draft for Comment) DB13-2019" requires a limit of 30mg / Nm 3 , in the compilation of the national mandatory standard "Code for Liquefied Natural Gas Engineering Projects", the continuous operation of SCV requires the addition of on-line monitoring devices and other requirements. The realization of low nitrogen oxide emissions by SCV is the key to the breakthrough of SCV technology at this stage

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