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Bittern continuous evaporation system

An evaporation system and bittern technology, which is applied in the field of salt chemical industry, can solve the problems of serious fouling of tubes in the heating chamber, high steam enthalpy of the outlet system, and discontinuous production system, so as to increase the effective production time and improve the heat transfer efficiency , the effect of reducing steam consumption

Inactive Publication Date: 2017-05-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional three-effect evaporation system, due to the high temperature of the steam at the outlet of the third-effect evaporator at the end of the system, the enthalpy of the steam out of the system is relatively high, and part of the heat energy is wasted; Shut down the cleaning system, the cleaning cycle is 1 time / day, resulting in the discontinuity of the production system and affecting the stability of production

Method used

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  • Bittern continuous evaporation system
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  • Bittern continuous evaporation system

Examples

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Embodiment 1

[0028] refer to figure 1 , the bittern bittern continuous evaporation system of the present invention, the evaporator is a forced circulation evaporator, adopts 3+1 effect evaporation process, specifically comprises the following steps:

[0029] (1) The raw bittern (or mixed bittern) enters the system from the feed port of the evaporation chamber of the 4-effect evaporator at a flow rate of 78 tons / hour, and the materials that meet the process requirements pass through the 3-effect, 2-effect and 1-effect evaporators in turn The evaporation chamber of the 1st effect evaporator is discharged from the discharge port of the 1st effect evaporator, and the evaporated liquid that meets the process requirements is sent to the heat preservation and settlement process, with a flow rate of 46 tons / hour; during this process, raw steam enters from the entrance of the heating chamber of the 1st effect evaporator System, the secondary steam generated by the 1-effect evaporator enters the hea...

Embodiment 2

[0035] The difference from Example 1 lies in step (2). When the scaling of the heating chamber of the 1-effect evaporator is serious, the 1-effect evaporator is stopped for cleaning and descaling, and the 2-effect evaporator is operated as the first effect, and the raw steam is directly sent into the 2-effect evaporator, the evaporated liquid is discharged from the 2-effect, the operating temperature and pressure are:

[0036]

[0037] After the 1-effect evaporator is shut down for cleaning and descaling, the evaporation system operates according to step (1).

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Abstract

The invention discloses a bittern continuous evaporation system. According to the method, a 3 plus 1 effect operation, namely a quadruple effect operation, is adopted, the first effect air inlet temperature is increased, and temperature difference and pressure difference among effects are reasonably distributed, so that the heat transfer efficiency can be improved, the tail-effect condensation load can be reduced, and the steam consumption is reduced by over 20 percent in comparison with that of a traditional triple effect evaporation; an inter-effect switching mode is adopted, only one evaporator is stopped after cleaning and descaling, triple-effect operation is switched, system halt is not required, continuous product can be realized, the effective production time is increased by over 20 percent, and the production capacity is remarkably improved.

Description

technical field [0001] The invention relates to the field of salt chemical industry, in particular to a bittern continuous evaporation system. Background technique [0002] The invention relates to the field of salt chemical industry, in particular to a bittern continuous evaporation system. [0003] Salt making waste liquid is also called bittern, which is a by-product of seawater (brine) salt making, which contains high concentrations of chemical components such as sodium chloride, magnesium chloride, magnesium sulfate and potassium chloride, and is mostly used to produce potassium sulfate for agriculture , co-production of magnesium chloride, industrial salt and other products. In the traditional potassium sulfate production process, a three-effect evaporation process is adopted. The raw bittern enters the system from the third effect evaporator, and then passes through the second effect evaporator and the first effect evaporator in turn, and the evaporated liquid th...

Claims

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Application Information

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IPC IPC(8): B01D1/26B01D1/30B01D1/00
CPCB01D1/26B01D1/0082B01D1/30
Inventor 纪作福王清宪张旭升吴中平朱怀金
Owner CHINA NAT OFFSHORE OIL CORP