CN217230292U

CN217230292U - Ammonia distillation system for purifying raw coke oven gas condensate wastewater

Info

Publication number: CN217230292U
Application number: CN202220934562.3U
Authority: CN
Inventors: 冯浪; 刘思浩; 肖敦峰; 李繁荣; 刘广智; 张洪伟; 梁永煌; 沈志远; 陈东祥; 詹信; 赵振强
Original assignee: Wuhan Tianyuan Engineering Co ltd
Current assignee: Wuhan Tianyuan Engineering Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-08-19
Anticipated expiration: 2032-04-21

Abstract

The utility model discloses an ammonia distillation system for purifying raw coke oven gas condensate wastewater, which comprises an ammonia distillation tower and a condensate wastewater pipeline, wherein the condensate wastewater pipeline is respectively connected with a tower top feed cooler and a side line ammonia cooler through pipelines, and the pipe side or the shell side of the tower top cooler is connected with a first condensate wastewater inlet at the top of the ammonia distillation tower; and the tube pass or the shell pass of the side ammonia cooler is connected with a second condensate wastewater inlet in the middle of the ammonia still through the tube pass or the shell pass of the feed preheater. The utility model discloses simple structure, effective energy saving and consumption reduction, equipment investment and running cost are low.

Description

Ammonia distillation system for purifying raw gas condensate wastewater

Technical Field

The utility model relates to a waste water treatment's field, specific ammonia distillation system for purifying raw coke oven gas condensate waste water that says so.

Background

The treatment of ammonia-containing wastewater is common in the chemical industry, and related ammonia distillation processes and equipment are available in almost all oil refineries, alkali-integrated plants, fertilizer plants and coking plants at present. On the heat source, the domestic ammonia distillation mode generally adopts steam to directly distill ammonia or adopts heat-conducting oil to indirectly distill ammonia; in terms of equipment, more ammonia distillation towers or heating furnaces are adopted for ammonia distillation.

At present, most ammonia distillation processes need to heat raw gas condensate wastewater to meet the temperature requirement in an ammonia distillation tower, and a heat source is water vapor or heat conducting oil, so that the energy consumption is increased to a great extent; in addition, the temperature of the crude ammonia extracted from the side line of the ammonia still is high, the crude ammonia needs to be condensed for many times, and more condensers are needed, so that the equipment cost is increased.

Disclosure of Invention

The utility model aims at solving the technical problem and providing an ammonia distillation system for purifying raw coke oven gas condensate wastewater, which has the advantages of simple structure, effective energy saving and consumption reduction, and equipment investment and operation cost reduction.

The technical scheme includes that the system comprises an ammonia still and a condensate waste water pipeline, wherein the condensate waste water pipeline is respectively connected with a tube pass or a shell pass of an overhead cooler and a lateral line ammonia cooler through pipelines, and the tube pass or the shell pass of the overhead cooler is connected with a first condensate waste water inlet at the top of the ammonia still; and the tube pass or the shell pass of the side ammonia cooler is connected with a second condensate wastewater inlet in the middle of the ammonia still through the tube pass or the shell pass of the feed preheater.

And a purified water outlet of the tower kettle of the ammonia still is connected with a shell side or a tube side of the feeding preheater through a discharge pump.

And a crude ammonia outlet in the middle of the ammonia still is connected with the shell side or the tube side of the ammonia cooler.

And the tower kettle of the ammonia still is communicated with the reboiler through a circulating pipeline.

Has the beneficial effects that:

1. the utility model divides the raw gas condensate wastewater into two feeding streams, one is fed from the top of the tower as the tower top condensate after being cooled by the tower top cooler, thereby avoiding introducing the tower top condensate additionally and reducing the energy consumption and the equipment cost; the other strand replaces cooling water as a refrigerant to cool the crude ammonia gas extracted from the side line of the ammonia still through an ammonia cooler, so that the number of coolers required by the subsequent multistage cooling of the crude ammonia is reduced, and the energy consumption and the equipment cost are reduced;

2. high-temperature purified water from the tower kettle of the ammonia still is used as a heat source to replace steam or heat conducting oil to preheat the raw gas condensate wastewater before entering the ammonia still through a feed preheater, so that the energy consumption is further reduced.

3. The utility model discloses simple structure, effective energy saving and consumption reduction, reduction equipment investment and running cost.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Wherein, 1, a tower top feeding cooler; 2. an ammonia still; 2.1, a first condensate wastewater inlet; 2.2, a second condensate wastewater inlet; 2.3, a crude ammonia gas outlet; 2.4, a purified water outlet; 3. a reboiler; 4. a discharge pump; 5. a side ammonia cooler; 6. a feed preheater; 7. A condensate waste water line.

Detailed Description

The invention will be further explained with reference to the drawings:

referring to fig. 1, a condensate waste water pipeline 7 is respectively connected with a tube pass or a shell pass (in this embodiment, a tube pass) of an overhead feed cooler 1 and a side ammonia cooler 5 through pipelines, and the tube pass or the shell pass (in this embodiment, a tube pass) of the overhead cooler 1 is connected with a first liquid condensate waste water inlet 2.1 at the top of an ammonia still 2; the tube side or the shell side (in the embodiment, the tube side) of the side ammonia cooler 5 is connected with a second condensate wastewater inlet 2.2 in the middle of the ammonia still 2 through the tube side or the shell side (in the embodiment, the tube side) of a feed preheater 6; a crude ammonia gas outlet 2.3 in the middle of the ammonia still 2 is connected with a shell pass or a tube pass (in the embodiment, the shell pass) of a side ammonia cooler 5; a purified water outlet 2.4 of the tower kettle of the ammonia still 2 is connected with a shell pass or a tube pass (in the embodiment, the shell pass) of the feed preheater 6 through a discharge pump 4; the tower kettle of the ammonia still 2 is communicated with the reboiler 3 through a circulating pipeline.

The working process comprises the following steps:

taking the raw gas condensate wastewater treatment (condensate wastewater for short) as an example, the condensate wastewater from the condensate wastewater pipeline 7 is divided into two streams, and one stream of the condensate wastewater is cooled by circulating cooling water of a tube side and a shell side of the tower top cooler 1 and then enters the top of the ammonia still 2 as tower top condensate; the tower top cooler 1 adopts circulating cooling water introduced into a shell pass as a refrigerant to indirectly cool the condensate wastewater. The ammonia still 2 and the reboiler 3 raise the temperature of the condensate wastewater, the generated waste gas (mainly carbon dioxide) is discharged from the top of the ammonia still 2, the generated crude ammonia is discharged from a crude ammonia outlet 2.3 in the middle of the ammonia still 2 to the shell side of a lateral line ammonia cooler 5, and the purified high-temperature purified water is discharged from a tower bottom discharge pump 4 to the shell side of a feed preheater 6;

the other strand of condensed liquid wastewater firstly enters the tube pass of the side line ammonia cooler 5, the condensed liquid wastewater which is discharged from the side line ammonia cooler 5 is subjected to indirect heat exchange with the crude ammonia gas in the shell pass to reduce the discharge temperature of the crude ammonia gas, the condensed liquid wastewater which is discharged from the side line ammonia cooler 5 enters the tube pass of the feeding preheater 6 again, the high-temperature purified water in the shell pass is subjected to indirect heat exchange to reduce the discharge temperature of the purified water, the condensed liquid wastewater which is discharged from the feeding preheater 6 is subjected to heat exchange and then is subjected to temperature rise, and finally the condensed liquid wastewater enters the middle part of the ammonia still 2 and is added into the rectification and purification process.

The process system does not need to additionally arrange a tower top condenser and a multi-stage ammonia cooler, can reduce energy consumption and equipment cost, and simultaneously does not need steam or heat conducting oil to preheat the crude gas condensate wastewater before entering the ammonia still 2, thereby reducing energy consumption.

Claims

1. The utility model provides an ammonia distillation system for purifying raw coke oven gas condensate waste water, includes ammonia still and condensate waste water pipeline, its characterized in that: the condensate wastewater pipeline is respectively connected with the tube side or the shell side of the tower top feeding cooler and the side ammonia cooler through pipelines, and the tube side or the shell side of the tower top feeding cooler is connected with a first condensate wastewater inlet at the top of the ammonia still; and the tube side or the shell side of the side ammonia cooler is connected with a second condensate wastewater inlet in the middle of the ammonia still through the tube side or the shell side of the feed preheater.

2. The ammonia distillation system for purifying raw gas condensate wastewater as claimed in claim 1, wherein the purified water outlet of the tower bottom of the ammonia distillation tower is connected with the shell side or the tube side of the feed preheater through a discharge pump.

3. The ammonia distillation system for purifying raw gas condensate wastewater as claimed in claim 1 or 2, wherein the crude ammonia outlet in the middle of the ammonia distillation tower is connected with the shell side or the tube side of the side ammonia cooler.

4. The ammonia distillation system for purifying raw gas condensate wastewater as claimed in claim 1 or 2, wherein the tower kettle of the ammonia distillation tower is communicated with the reboiler through a circulating pipeline.