Device and a method for process for removing nitric oxide from tail gas of sulfur recovery device
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A nitrogen oxide and sulfur recovery technology, applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve problems such as catalyst poisoning and blockage, and achieve the effect of reducing costs and increasing operating life.
Active Publication Date: 2021-03-16
江苏昆仑互联科技有限公司
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The traditional arrangement of denitrification first and then desulfurization will have a series of disadvantages such as catalyst poisoning and blockage
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[0057] The denitrification technology used in the patent of this invention is selective catalytic reduction (SCR).
[0058] Selective Catalytic Reduction (SCR), the first is to mix ammonia with dilution air or flue gas, generally diluted to 3-5% (volume fraction), and finally spray it into the flue gas upstream of the SCR reactor using the ammonia injection grid In the process, under the action of catalyst, ammonia selectively converts NOx (mainly NO and NO 2 , where NO dominates) into nitrogen and water, rather than by O 2 oxidized, reducing the NH 3 consumption.
[0059] The main reactions are as follows:
[0060] 4NH 3 +4NO+O 2 =4N 2 +6H 2 o
[0061] 4NH 3 +2NO 2 +O 2 =3N 2 +6H 2 O.
[0062] In the absence of catalysts, the above chemical reactions can only be carried out in a narrow temperature range (about 980°C). When different catalysts are selected, the reaction temperature can be controlled in different temperature ranges. Commercial denitrification cat...
Embodiment 1
[0065] A coal-to-oil enterprise sulfur recovery tail gas incineration tail gas, the flue gas conditions after heat recovery by waste heat boiler are as follows:
[0066] serial number project unit data Remark 1 temperature ℃ 220 2 pressure KPa (g) ≮7 3 volume flow N m 3 / h
152000 Standard state, wet basis, actual oxygen 4 SO 2
[0067] The desulfurization temperature of the incineration tail gas is too high, and the natural air (152000Nm 3 / h, 10°C) mixed air cooling down to 134°C, SO 2 , NOx conversion concentration unchanged. Desulfurization adopts ammonia desulfurization process, and SO after ammonia desulfurization 2 Concentration down to 35mg / Nm 3 (Standard state, dry basis...
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Abstract
The invention provides a device and a method for a process for removing nitric oxide from tail gas of a sulfur recovery device. The system comprises a sulfur recovery tail gas incineration device, a heat exchanger, a desulfurization device, a first-stage steam heater, a GGH heat exchanger, a second-stage steam heater, an ammonia spraying grid, a denitration reactor and a flue gas pipeline. Tail gas of the sulfur recovery device is incinerated to enable sulfur-containing compounds in the tail gas to be incinerated and converted into SO2, high-temperature flue gas obtained after incineration isintroduced into the heat exchanger, the temperature of the flue gas is reduced, and then the flue gas is introduced into a desulfurization device for desulfurization. Desulfurized flue gas passes through the first-stage steam heater, the GGH heat exchanger, the second-stage steam heater and other devices to enable the temperature to reach the efficient reaction temperature interval of the denitration reactor, then the flue gas enters the denitration reactor to complete nitrogen oxide removal, heat exchange between reacted high-temperature flue gas and cold flue gas is completed through the GGHheat exchanger, and the flue gas is discharged through a chimney after the temperature of the flue gas is reduced. A series of defects of catalyst poisoning, blockage and the like in a traditional arrangement mode of denitration before desulfurization are overcome.
Description
technical field [0001] The invention relates to the technical field of flue gas treatment of tail gas incinerators of sulfur recovery devices, in particular to a device and method for removing nitrogen oxides from tail gas of sulfur recovery devices. Background technique [0002] With the rapid growth of my country's national economy, coal chemical industry and petroleum processing have developed rapidly. The processing volume of sour coal, crude oil and sour natural gas also increased accordingly. In particular, since the 1990s in my country, the oil refining industry has processed a large amount of imported sour crude oil. Economic growth and strict control of environmental protection make related gas desulfurization recovery technology increasingly important. [0003] Since the industrialization of sulfur recovery Claus (Claus) process in the 1930s, after decades of development and improvement, the process has been very mature and perfect. However, because the Claus re...
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