食盐冷却设备与抗结块工艺研究

doi:10.19964/j.issn.1006-4990.2025-0090

Abstract

Abstract:

The temperature of edible salt during packaging significantly influences the anti-caking properties of salt.Reducing the packaging temperature effectively prolongs the caking period and improves edible salt quality.Salt discharged from the drying bed is usually at a high temperature.In this paper，in order to reduce the temperature，the powder flow heat exchanger was applied for salt cooling for the first time，and the comparative pilot-scale experiment was conducted with the fluidized bed heat exchanger to evaluate their cooling efficiency and anti-caking effect.The results indicated that both devices achieved effective salt cooling，reducing salt temperature from 77 ℃ to 25~27 ℃.The caking degree of the samples was continuously monitored after the experiment.After 150 d，the cooled samples showed false caking，while samples packaged at high temperature had already exhibited true caking.After 180 d of storage，the caking rates of the salt cooled by the powder flow and fluidized bed were 31.20% and 33.14%，respectively.In contrast，caking rates for hot-packaged counterparts reached 61.71% and 57.43%，respectively，demonstrating significant improvement in the anti-caking property of edible salt following cooling treatment.Furthermore，energy consumption measurements were measured for both cooling systems.The powder flow heat exchanger was found to consume significantly less energy than the fluidized bed，demonstrating greater suitability for large-scale material cooling applications.

Key words: edible salt, caking, cooling equipment, powder flow heat exchanger, fluidized bed heat exchanger

CLC Number:

TQ131.12

CHEN Junchen, FANG Siyong, PENG Jianqiang, ZHOU Zhongxu, LI Pengfei, CUI Zheng. Study on cooling equipment and anti-caking process of edible salt[J]. Inorganic Chemicals Industry, 2026, 58(3): 72-77.

Figures/Tables 12

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结块程度	感官描述
未结块	完全松散，流动性良好
轻度假性结块	有少量结块，流动性较好，轻轻触碰易散
中度假性结块	有许多结块，流动性一般，外力可捏碎
重度假性结块	有大量的结块，流动性较差，外力可敲碎
真性结块	完全结块，无流动性，外力难以弄散

序号	不同粒度范围样品的质量分数/%
序号	<0.30 mm	0.30~<0.50 mm	0.50~<0.60 mm	0.60~0.85 mm
1	0.37	51.55	44.04	3.84
2	0.14	35.28	60.16	3.67
3	1.01	40.79	53.03	4.74
平均值	0.51	42.54	52.41	4.08

	储存时间
	12 h	10 d	30 d	60 d	90 d	150 d
A	轻度假性结块	轻度假性结块	中度假性结块	中度假性结块	重度假性结块	真性结块
B	未结块	轻度假性结块	轻度假性结块	轻度假性结块	中度假性结块	重度假性结块
C	轻度假性结块	轻度假性结块	中度假性结块	中度假性结块	重度假性结块	真性结块
D	未结块	轻度假性结块	轻度假性结块	轻度假性结块	中度假性结块	重度假性结块

时间/d	A结块率/%	B结块率/%	C结块率/%	D结块率/%
120	8.00	2.43	12.19	1.71
180	61.71	31.20	57.43	33.14
240	76.57	61.87	73.12	55.57

设备	物料处理量/（t·h^-1）	冷却介质温度/℃	冷却水消耗量/（t·h^-1）	冷却空气消耗量/（Nm³·h^-1）
流化床中试设备	1.20	13		880
粉体流中试设备	0.31	13	0.72
流化床工业设备	35.00	32		20 000
粉体流工业设备	35.00	32	30.00	700

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on cooling equipment and anti-caking process of edible salt

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