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High energy recovery nitric acid process using liquid oxygen containing fluid

A kind of technology of process and fluid, applied in the field of nitric acid production process

Active Publication Date: 2021-03-30
YARA INT ASA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, disruptions from renewable energy sources such as wind or solar can adversely affect this part of the process.
While power outages can be overcome, for example, by using batteries (such as, in the case of solar power, by storing energy during the day and discharging it at night), this is not only in terms of battery cost, but also in terms of the additional PV or wind energy required to charge the batteries. On the unit side, both pay a considerable capital cost

Method used

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  • High energy recovery nitric acid process using liquid oxygen containing fluid
  • High energy recovery nitric acid process using liquid oxygen containing fluid
  • High energy recovery nitric acid process using liquid oxygen containing fluid

Examples

Experimental program
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example 1

[0131] Figure 2A An example of a process for making nitric acid as provided herein is shown, depicting how energy can be recovered from the combustion of ammonia in the production of nitric acid. Ammonia gas is fed via the ammonia gas supply line (130), wherein the ammonia gas is first mixed with an oxygen-containing fluid in a mixing unit (150), which is then fed through the burner (100) comprising a catalyst. The ammonia combustion gases exit the burner (100) via the ammonia combustion outlet line (160). Especially air, oxygen-enriched air or O 2 The oxygen-containing fluid is supplied in liquid form via the oxygen supply line (120), here liquid oxygen (O 2 ) or liquid air. The liquid oxygen-containing fluid is vaporized and superheated by one or more heaters (140) on the oxygen supply line (120). One or more heaters (140) dissipate heat from one or more heat exchangers (161) and / or condensers (162) on the ammonia combustion outlet line (160). The superheated oxygen-co...

example 2

[0137] image 3 An example of a combined process for the manufacture of ammonia and nitric acid as provided herein is shown wherein liquid and pressurized N 2 flow, depicting how energy can be recovered in a Haber-Bosch circuit (700) based on liquid nitrogen. In this example, in liquid form from N 2 Buffer tank (721) or feed N directly from the air separation unit 2 . in liquid N 2 via N 2 The inlet (720) is pressurized by a cryopump (722) before entering the Haber-Bosch loop (700) and then evaporated in a heater / evaporator (797). N 2 via H 2 Entrance (710) and H 2 (where H 2 gas in H 2 compressed in the compressor (711), and mixed with recycled unreacted N 2 and H 2 (compressed in compressor (760)) mixing. contains N 2 and H 2 The mixture is preheated in a preheater (790) before entering the converter unit (730), where the mixture undergoes an exothermic reaction to produce ammonia and unreacted H 2 and N 2 of the hot reaction mixture. To the ammonia stream ...

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Abstract

A novel concept for a high energy and material efficient nitric acid production process and system is provided, wherein the nitric acid production process and system, particularly integrated with an ammonia production process and system, is configured to recover a high amount of energy out of the ammonia that it is consuming, particularly in the form of electricity, while maintaining a high nitricacid recovery in the conversion of ammonia to nitric acid. The energy recovery and electricity generation process comprises pressurizing a liquid gas, such as air, oxygen and / or N2, subsequently evaporating and heating the pressurized liquid gas, particularly using low grade waste heat generated in the production of nitric acid and / or ammonia, and subsequently expanding the evaporated pressurizedliquid gas over a turbine. In particular, the generated electricity is at least partially used to power an electrolyzer to generate the hydrogen needed for the production of ammonia. The novel concepts set out in the present application are particularly useful in the production of nitric acid based on renewable energy sources.

Description

technical field [0001] The present invention relates to the technical field of chemical treatment. In particular, the present invention relates generally to nitric acid production processes, in particular in connection with one or more processes located upstream and / or downstream of nitric acid production (such as, respectively, ammonia production, in particular for the use of hydrogen generated by electrolysis of water Ammonia production, and nitrate-based fertilizer production) combined nitric acid production process. The invention also relates to a system for carrying out the nitric acid production process according to the invention. Background technique [0002] Nitric acid is typically produced through a multi-step process in which ammonia gas is oxidized to nitrogen oxides which are then absorbed by water to produce nitric acid. In a first step, anhydrous ammonia is oxidized to nitric oxide (NO) and water (steam) by oxygen or air in the presence of a catalyst (for ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/26C01B21/28F01K23/00F02C6/00F25B17/00
CPCC01B21/26C01B21/28Y02P20/133F01K15/00Y02E60/36F25J2260/30F25J3/04527F25J3/04587F25J3/04836F25J3/04842F25J3/04339F25J3/04224F25J1/0012F25J1/0234F25J1/0251F25J2205/86F25J3/04612Y02P20/129C01C1/0405C01C1/047B01J19/245C01B21/36C01B21/40C01C1/0417C25B1/04F01K23/00
Inventor 马克西米利安·华纳
Owner YARA INT ASA