CN201089725Y - Device for neutralizing and concentrating ammonium nitrate - Google Patents

Abstract

The utility model discloses a neutralizing and concentrating device for ammonium nitrate, which belongs to the production device of ammonium nitrate. A separator is arranged on the pipeline, and the top of the neutralizer is connected to a section of evaporation heater through a pipeline, and a flash tank and a re-neutralizer are connected between the neutralization liquid tank and the first section of evaporation heater through a pipeline, and the neutralization liquid tank The pipeline between the flash tank and the flash tank is supplemented by a neutralizing liquid pump. Compared with the prior art, the ammonium nitrate neutralization and concentration device of the utility model has the characteristics of reasonable design, high production efficiency, low cost, reduced ammonia consumption, acid consumption, steam consumption, and no pollution to the environment.

Description

A neutralizing and concentrating device for ammonium nitrate

technical field

The utility model relates to a production device for ammonium nitrate, in particular to a neutralization and concentration device for ammonium nitrate.

Background technique

China's existing production capacity of ammonium nitrate is 4.6 million t/China National Offshore Oil Corporation and Shandong Provincial Chemical Industry Planning and Design Institute, and more than 80% of the processes used have followed the neutralization pressure 0.02-0.05MP built by the former Soviet Union during the "First Five-Year Plan" period of China. China National Offshore Oil Corporation, Shandong Provincial Chemical Engineering Planning and Design Institute atmospheric pressure ammonium nitrate production process and equipment, the above process and equipment have the following problems: 1. The gas-liquid separator in the neutralizer of the original process adopts a bell type separator The separation effect is poor, and the phenomenon of secondary steam with liquid is very common; 2. The ammonium nitrate solution at the outlet of the neutralizer contains 1-2g/l of nitric acid, and the temperature is 105-120°C. Add ammonia to the re-neutralizer, due to the temperature of the solution High, the effect of adding ammonia in the re-neutralizer is not good, a large part of the gas ammonia is emptied with the vent pipe of the re-neutralizer, resulting in high ammonia consumption and environmental pollution; 3. The first stage evaporator The evaporation effect is poor. The heating steam used in the first stage of the evaporator is the secondary steam from the neutralizer, and the evaporated solution is from the ammonium nitrate solution of the re-neutralizer. Under the action of negative pressure, a gas film is formed on the inner wall of the evaporation tube, which affects the transfer of heat energy inside and outside the tube, the heat transfer effect is low, and the utilization rate of the effective heat exchange area is low. When the concentration of raw nitric acid is 45%, the neutralizer The outlet concentration of ammonium is 65%, and the outlet concentration of the first-stage evaporator is only 72%-75%.

Contents of the invention

The technical task of the utility model is to provide a neutralizing and concentrating device for ammonium nitrate that reduces ammonia consumption, acid consumption, and steam consumption and has no pollution to the environment.

The technical solution adopted by the utility model to solve the technical problem is: the device includes a neutralizer, a neutralization liquid tank and a section of evaporation heater, a separator is arranged on the pipeline connected between the neutralizer and the neutralization liquid tank, The top of the neutralizer is connected to a first-stage evaporation heater through a pipeline, and a flash tank and a re-neutralizer are connected through a pipeline between the neutralization liquid tank and the first-stage evaporation heater, and the pipeline between the neutralization liquid tank and the flash tank The upper auxiliary has a neutralizing liquid pump.

The top of the neutralizer is provided with a primary separation device and a secondary separation device; the lower part of the first-stage evaporation heater is provided with an upper heat exchanger and a lower heat exchanger.

The dilute nitric acid (45%) from the dilute nitric acid section enters the neutralizer after being measured by the nitric acid head tank and flowmeter, and the ammonia gas from the synthesis section enters the filter and the ammonia preheater after being heated by steam Neutralizer for neutralizing reaction with nitric acid. The reacted ammonium nitrate solution is evaporated to about 65% by the reaction heat in the neutralizer, and after entering the neutralizing liquid tank, it is sent to the flash tank for flash evaporation through the neutralizing liquid pump (or pipeline), and then sealed by the liquid level After that, it flows into the re-neutralizer by itself, where ammonia gas is added to react with the excess nitric acid in the solution to make the solution slightly alkaline, and the steam discharged from the top of the neutralizer is separated by the two-stage vapor-liquid separation device inside the neutralizer before entering One-stage evaporative separator is used as secondary steam. The heat exchanger part of the first-stage evaporative separator is divided into two sections. The lower heat exchanger uses the secondary steam of the neutralizer, and the upper heat exchanger uses the steam condensate evaporated in the second stage.

Compared with the prior art, a kind of ammonium nitrate neutralizing and concentrating device of the present utility model has the following characteristics:

1. There are two-stage high-efficiency gas-liquid separation devices in the neutralizer, which eliminates the phenomenon of liquid in the secondary steam, and reduces the entrainment of ammonia, nitric acid and ammonium nitrate in the secondary steam. Compared with the existing equipment, the reduction is 60% %~80%.

2. The temperature of the ammonium nitrate in the re-neutralizer is reduced to 75-80° C., and the loss of ammonium gas added is small, and the loss reduction is more than 50%.

3. When the concentration of nitric acid is 45%, the concentration of ammonium nitrate at the outlet of the neutralizer is about 65%, and the concentration at the outlet of the first-stage evaporation heater of the original equipment is 72-75%. This equipment can increase it to 80%, saving 80-120kg of steam per ton of ammonium nitrate .

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Accompanying drawing is the structural representation of a kind of ammonium nitrate neutralization concentration device.

In the figure: 1. Neutralizer, 2. Primary separation device, 3. Secondary separation device, 4. Separator, 5. Neutralization liquid tank, 6. Pipeline, 7. Neutralization liquid pump, 8. Flash evaporation Tank, 9, one-stage evaporation heater, 10, upper heat exchanger, 11, lower heat exchanger, 12, re-neutralizer.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

A neutralizing and concentrating device for ammonium nitrate of the present utility model has a structure comprising a neutralizer 1, a neutralizing liquid tank 5, an evaporation heater 9, and a pipeline 6 connected between the neutralizing device 1 and the neutralizing liquid tank 5 A separator 4 is arranged on the top of the neutralizer 1, and the top of the neutralizer 1 is connected to a first-stage evaporation heater 9 through a pipeline 6, and a flash tank 8 and a re-neutralization tank are connected through a pipeline 6 between the neutralization liquid tank 5 and the first-stage evaporation heater 9. A device 12, a neutralizing liquid pump 7 is auxiliary on the pipeline 6 between the neutralizing liquid tank 5 and the flash tank 8. The top of the neutralizer 1 is provided with a primary separation device 2 and a secondary separation device 3 ; the lower part of the primary evaporation heater 9 is provided with an upper heat exchanger 10 and a lower heat exchanger 11 .

The processing and manufacture of a kind of ammonium nitrate neutralizing and concentrating device of the utility model is very simple and convenient, and can be processed and manufactured as shown in the accompanying drawings.

Except for the technical features described in the instructions, all are known technologies by those skilled in the art.

Claims (3)

1. A neutralizing and concentrating device for ammonium nitrate, comprising a neutralizer, a neutralizing liquid tank and one section of evaporation heater, characterized in that a separator is arranged on the pipeline connected between the neutralizing device and the neutralizing liquid tank, and The top of the neutralizer is connected to a first-stage evaporation heater through a pipeline, and a flash tank and a re-neutralizer are connected through a pipeline between the neutralization liquid tank and the first-stage evaporation heater, and the pipeline between the neutralization liquid tank and the flash tank Auxiliary neutralizing liquid pump. 2. the neutralization concentration device of ammonium nitrate according to claim 1 is characterized in that the top of neutralizer is provided with primary separation device and secondary separation device. 3. the neutralization concentration device of ammonium nitrate according to claim 1 is characterized in that the bottom of one section of evaporation heater is provided with upper section heat exchanger and lower section heat exchanger.

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