RU1813968C - Liquid ammonia handling method - Google Patents

Abstract

SUMMARY OF THE INVENTION: Liquid ammonia is transported via a coaxial pipeline with a flow of a protective medium flowing through the annulus. As a protective medium, cleaned water is used with the addition of ammonia rt 2 up to 50% taken from the central pipeline. Water is then used for cooking. aqueous ammonia solution. Transport is carried out by a multi-channel coaxial pipeline. Ammonia-water solutions are transported through the annulus with a concentration increasing from peripheral to the central pipeline. 1 s.p. f-ly .; $

Description

The invention relates to pipeline transport, in particular to a method for transporting environmentally harmful and aggressive products in pipelines such as pipe in pipe.

A method is proposed for transporting liquid ammonia in technological installations for neutralizing the combustion products of thermal power plants, including transporting it through a coaxial pipeline with a countercurrent protective medium supplied through the annulus .. -: Ј

The novelty is that chemically purified water with the addition of ammonia from 2 to 5%, taken from the central pipeline, is used as a protective medium, and water is then used to prepare ammonia-water solutions. Moreover, the transport is carried out using multi-channel coaxial

pipeline, through the annular spaces which you transported water-emmia-. solutions with a concentration increasing from peripheral to central pipelines ..; The proposed method of transportation does not provide for the separation of technology; production geography into three stages: obtaining a number of streams with various concentrations, -; their actual transportation in the main pipeline, such as pipe in pipe; completion of the preparation of the necessary solutions for consumption. Moreover, the choice of .concentration of transported solu- The ammonia ditch is produced taking into account the chemical properties and environmental safety, as well as the properties of the solutions obtained in. the result of their mixing with solutions transported through a central pipeline. Moreover, both depressurization of any of the pipelines, and their simultaneous depressurization should exclude

$

CXX).

Ov

with

ecological pollution of the environment.

The lower limit of the concentration of ammonia 6 of chemically purified water transported along the annulus ensures non-freezing at the lowest possible negative temperatures. An upper limit of 5% is set based on the environmental safety of the transported chemically treated water.

Consider a scheme for supplying ammonia for combustion in furnaces of thermal power plants (CHP) for purification of flue gases. At a liquid ammonia warehouse located outside the sanitary zone, a solution of ammonia is prepared and transported through a central pipeline. Chemically purified water (necessary for the preparation of ammonia solutions) is transported in the CHP plant through the annulus to the liquid ammonia warehouse where the solution is prepared. Part of the aqueous ammonia solution is added to chemically purified water up to 5%.

Example. To neutralize the combustion products of a thermal power plant with a capacity of 0.8 MTW, a supply of 5 M3 / h of liquid ammonia and 20 m ° / h of 25% ammonia water is required.

Chemically purified water with an addition of ammonia of up to 5% in the outer annulus is transported to the liquid ammonia storage. The prepared 25% ammonia water is supplied to the consumer in an amount of 20 over the middle annulus. 99.9% ammonia is supplied through a central pipeline. A small portion of ammonia is added to the chemically treated water to a concentration of 5%.

The proposed component transportation scheme almost completely eliminates the creation of environmentally hazardous ammonia concentrations. Thus, with simultaneous depressurization of pipelines, the maximum possible concentration of ammonia is 24.5%.

In those cases where Flue Gas Treatment Technologies require ammonia solutions of various concentrations, transportation can be carried out via two or more concentric pipelines. Moreover, the concentration of solutions in this case should increase from peripheral to central pipelines.

Claims (2)

1. A method of transporting liquid ammonia in technological installations for the neutralization of combustion products of thermal power plants, including transporting it through a coaxial pipeline with a protective medium supplied through the annular space in countercurrent, so that it can be cleaned. that chemically purified water is used as a protective medium with the addition of ammonia from 2 to 50% taken from the central pipeline, the water being then used to prepare ammonia-water solutions. 2. The method according to claim 1, wherein the transport is carried out using a multichannel coaxial pipeline, water-ammonia solutions with a concentration increasing from peripheral to central pipelines being transported through the annular spaces.