阅读说明：本技术 一种减少脱硫溶剂净化除盐再生废液的方法 (Method for reducing desulfurization solvent purification desalting regeneration waste liquid ) 是由 杨国庆 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种减少脱硫溶剂净化除盐再生废液的方法。本发明在再生工艺上进行了改进,取部分新鲜的再生剂对已经失效污染的树脂进行再生,然后用余下的部分再生剂再对已经再生的树脂进一步强化再生,出来的再生液再回到再生罐,循环三次,再生后的树脂可以用上一步储存在回收水循环罐中的水进行冲洗,第一步用部分水冲洗树脂至再生罐,用于下个循环的再生剂配制,第二步用余下部分水冲洗树脂,循环多次后排出,然后用工艺除盐水冲洗树脂至循环罐储存,从而可以使再生废液量得到降低,含量也得到降低,冲洗的水量得到降低,再生效率得到提高,还可以提高树脂的转型率,很大程度减小环保压力,保证设备能够正常运行。(The invention discloses a method for reducing desulfurization solvent purification desalting regeneration waste liquid. The invention improves the regeneration process, takes part of fresh regenerant to regenerate the resin with failure pollution, then the rest of the regenerant is used for further strengthening regeneration of the regenerated resin, the discharged regeneration liquid is returned to the regeneration tank for three times of circulation, the regenerated resin can be flushed by the water stored in the recovered water circulation tank in the previous step, the resin is flushed to the regeneration tank by part of the water in the first step, preparing the regenerating agent for the next circulation, washing the resin with the rest part of water in the second step, circulating for many times and then discharging, then the resin is washed to the circulating tank by the process desalted water for storage, so that the amount of the regenerated waste liquid is reduced, the content of the regenerated waste liquid is also reduced, the washing water amount is reduced, the regeneration efficiency is improved, the transformation rate of the resin can be improved, the environmental protection pressure is reduced to a great extent, and the normal operation of equipment is ensured.)

1. The method for reducing the purification and desalting regeneration waste liquid of the desulfurization solvent comprises the steps of regenerating the polluted resin by using a fresh regenerant, washing the resin by using recovered water, washing the resin by using process desalted water, and storing the resin after the treatment is finished, and is characterized in that: the method for reducing the desulfurization solvent purification desalting regeneration waste liquid uses solvent purification desalting equipment, and the solvent purification desalting equipment consists of a resin exchanger, a regeneration tank, a recovered water circulating tank, an alkali adding pump, a regeneration pump, a circulating pump, a flow meter and a liquid level meter.

2. The method for reducing the desulfurization solvent purification desalination regeneration waste liquid as claimed in claim 1, characterized in that: the method for reducing the purification and desalting regeneration waste liquid of the desulfurization solvent comprises the following steps:

firstly, pumping part of regenerant in a regeneration tank into a resin exchanger by a regeneration pump, and discharging the regenerated regenerant to a regeneration waste liquid treatment device after passing through the resin exchanger, wherein the liquid level meter controls the regeneration tank;

step two, the regeneration pump pumps the residual regenerant in the regeneration tank into the resin exchanger, and the residual regenerant is discharged to the regeneration tank after passing through the resin exchanger, wherein the step is controlled by time;

step three, pumping the residual regenerant in the regeneration tank into a resin exchanger by a regeneration pump, and discharging the regenerated regenerant to a regeneration waste liquid treatment device after passing through the resin exchanger, wherein the step is controlled by a liquid level meter;

pumping water in the recovered water circulation tank into the resin exchanger by a circulating pump, and discharging the water to a regeneration tank after passing through the regeneration tank for preparing a next circulation regenerant, wherein the step is controlled by a liquid level meter;

step five, the circulating pump pumps the residual water in the recycled water circulating tank into the resin exchanger, and the residual water is discharged to the recycled water circulating tank after passing through the resin exchanger, wherein the step is controlled by time;

step six, the circulating pump pumps the residual water in the recovered water circulating tank into the resin exchanger, and the residual water is discharged to a regenerated cleaning liquid outlet after passing through the resin exchanger and collected to a regenerated waste liquid treatment device, and the step is controlled by a liquid meter;

flushing the process desalted water into a recycled water circulating tank through a resin exchanger, wherein the process desalted water is controlled by a liquid level meter;

step eight, the solvent to be treated passes through a resin exchanger, and the treated solvent returns to a solvent storage tank, wherein the step is controlled by a flow meter;

step nine, pumping external high-concentration alkali liquor into a regeneration tank by an alkali adding pump, and simultaneously starting the step eight and controlling the step eight by a liquid level meter;

wherein, the steps from one to nine are a cycle period, the start of several cycle periods within one hour is determined according to the salt content in the solvent, and the whole operation process is automatically controlled by a PLC program.

Technical Field

The invention relates to the technical field of reducing desulfurization solvent purification and desalination regeneration waste liquid, in particular to a method for reducing desulfurization solvent purification and desalination regeneration waste liquid.

Background

In natural gas plants and oil refineries, amine liquid is usually used for removing H2S and CO2 in liquefied gas and dry gas, but after a solvent regeneration system runs for a period of time, an alcohol amine solution can generate accumulation of byproduct Heat Stable Salt (HSS), and suspended solids and dark color of the amine liquid can also occur.

The organic solvent amine is used for removing hydrogen sulfide and carbon dioxide contained in dry gas, liquefied gas and the like, thereby avoiding the pollution to the environment, however, in the process of removing these acidic gases, there is a problem that salt substances are generated by combining the amine solution with anions existing in various forms in the solution, such salts, which cause corrosion of equipment, run-off of solvent, increase unplanned shutdowns and associated maintenance costs, must be removed by solvent cleanup facilities to release more of the available amine, the regeneration waste liquid is generated in the desalting process by the ion exchange method, the regeneration waste liquid is the waste alkali residue, the subsequent treatment process is relatively troublesome due to strong alkalinity and high COD, therefore, the smaller the amount generated, the more economical the equipment is to operate, and a method for reducing the purification and desalting regeneration waste liquid of the desulfurization solvent is designed.

Disclosure of Invention

The invention provides a method for reducing the purification and desalting regeneration waste liquid of a desulfurization solvent, which can solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the method for reducing the desulfurization solvent purification desalting regeneration waste liquid comprises the steps of regenerating polluted resin by using a fresh regenerant, flushing the resin by using recovered water, flushing the resin by using process desalting water and storing the resin after treatment is finished.

Preferably, the method for reducing the desulfurization solvent purification desalting regeneration waste liquid comprises the following steps:

firstly, pumping part of regenerant in a regeneration tank into a resin exchanger by a regeneration pump, and discharging the regenerated regenerant to a regeneration waste liquid treatment device after passing through the resin exchanger, wherein the liquid level meter controls the regeneration tank;

step two, the regeneration pump pumps the residual regenerant in the regeneration tank into the resin exchanger, and the residual regenerant is discharged to the regeneration tank after passing through the resin exchanger, wherein the step is controlled by time;

step three, pumping the residual regenerant in the regeneration tank into a resin exchanger by a regeneration pump, and discharging the regenerated regenerant to a regeneration waste liquid treatment device after passing through the resin exchanger, wherein the step is controlled by a liquid level meter;

pumping water in the recovered water circulation tank into the resin exchanger by a circulating pump, and discharging the water to a regeneration tank after passing through the regeneration tank for preparing a next circulation regenerant, wherein the step is controlled by a liquid level meter;

step five, the circulating pump pumps the residual water in the recycled water circulating tank into the resin exchanger, and the residual water is discharged to the recycled water circulating tank after passing through the resin exchanger, wherein the step is controlled by time;

step six, the circulating pump pumps the residual water in the recovered water circulating tank into the resin exchanger, and the residual water is discharged to a regenerated cleaning liquid outlet after passing through the resin exchanger and collected to a regenerated waste liquid treatment device, and the step is controlled by a liquid meter;

flushing the process desalted water into a recycled water circulating tank through a resin exchanger, wherein the process desalted water is controlled by a liquid level meter;

step eight, the solvent to be treated passes through a resin exchanger, and the treated solvent returns to a solvent storage tank, wherein the step is controlled by a flow meter;

step nine, pumping external high-concentration alkali liquor into a regeneration tank by an alkali adding pump, and simultaneously starting the step eight and controlling the step eight by a liquid level meter;

wherein, the steps from one to nine are a cycle period, the start of several cycle periods within one hour is determined according to the salt content in the solvent, and the whole operation process is automatically controlled by a PLC program.

Compared with the prior art, the invention has the beneficial effects that: the invention improves the regeneration process, takes part of fresh regenerant to regenerate the resin which is polluted by failure, at the moment, the regenerated liquid contains a large amount of salt substances and has low alkali content concentration, then the regenerated resin is further enhanced and regenerated by the rest of regenerant, the discharged regenerated liquid returns to the regeneration tank to be circulated for three times until the regenerated waste liquid is discharged, the regenerated resin can be flushed by the water stored in the recycle water circulation tank in the last step, the process is also divided into two steps, the resin is flushed to the regeneration tank by part of water for preparation of the next recycled regenerant, the resin is flushed by the rest of water after being circulated for multiple times and then discharged, and then the resin is flushed to the circulation tank by process desalted water for storage, so that the amount of the regenerated waste liquid can be reduced, the content is also reduced, the flushing water amount is reduced, and the regeneration efficiency is improved, the transformation rate of the resin can be improved, the environmental protection pressure is reduced to a great extent, the normal operation of the equipment is ensured, and a certain use prospect is achieved.

Drawings

FIG. 1 is a schematic view of the process flow of the invention for reducing the regenerated waste liquid of desulfurization solvent purification and desalination.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1, the present invention provides a technical solution: firstly, a regeneration pump pumps part of the regenerant in a regeneration tank into a resin exchanger, and the regenerated regenerant is discharged to a regeneration waste liquid treatment device after passing through the resin exchanger, wherein the step is controlled by a liquid level meter; secondly, pumping the residual regenerant in the regeneration tank into a resin exchanger by a regeneration pump, discharging the regenerated regenerant to the regeneration tank after passing through the resin exchanger, wherein the step is controlled by time; then, the regeneration pump pumps the residual regenerant in the regeneration tank into the resin exchanger, and the residual regenerant is discharged to a regeneration waste liquid treatment device after passing through the resin exchanger, and the step is controlled by a liquid level meter; then the circulating pump pumps the water in the recovered water circulating tank into the resin exchanger, and the water is discharged to the regeneration tank after passing through the regeneration tank for preparing the next circulating regenerant, wherein the step is controlled by the liquid level meter; the circulating pump pumps the residual water in the recovered water circulating tank into the resin exchanger, and the residual water is discharged to the recovered water circulating tank after passing through the resin exchanger, wherein the step is controlled by time; the circulating pump pumps the residual water in the recovered water circulating tank into the resin exchanger, and the residual water is discharged to a regenerated cleaning liquid outlet after passing through the resin exchanger and collected to a regenerated waste liquid treatment device, and the step is controlled by a liquid meter; flushing process desalted water into the recovered water circulating tank through the resin exchanger, wherein the step is controlled by a liquid level meter; the solvent to be treated passes through a resin exchanger, and the treated solvent returns to a solvent storage tank, wherein the step is controlled by a flow meter; pumping external high-concentration alkali liquor into a regeneration tank by an alkali adding pump, and simultaneously starting the step eight and controlling by a liquid level meter;

wherein, the steps from one to nine are a cycle period, the start of several cycle periods within one hour is determined according to the salt content in the solvent, and the whole operation process is automatically controlled by a PLC program.

When the volume of the resin in the resin exchanger is 100L, the amount of 4% regenerant is required to be 200L, the amount of washing water is 200L, the total amount of generated regeneration waste liquid is 400L, the detected alkali concentration is 2.2%, and the conversion rate of the resin is 72%.

Comparative example

After the regeneration method disclosed by the invention, the data under three conditions are detected:

1. under the condition that the regeneration dosage is not changed, the washing water quantity is adjusted to be 160L, the total quantity of the generated regeneration waste liquid is 360L, the alkali content in the regeneration waste liquid is detected to be 1.8%, and the transformation rate of the resin is 86%;

2. under the condition that the washing water quantity is not changed, the regeneration dosage is adjusted to be 160L, the total amount of the generated regeneration waste liquid is 360L, the alkali content in the regeneration waste liquid is detected to be 1.5%, and the transformation rate of the resin is 82%;

3. when the amount of the regenerant is reduced to 150L and the flushing water amount is reduced to 150L, the total amount of the generated regenerated waste liquid is 300L, the alkali content of the regenerated waste liquid is detected to be 1.7%, and the transformation rate of the resin is 81%;

the invention discloses a method for reducing the comparative data of a desulfurization solvent purification desalting regeneration waste liquid before the process is not improved:

the original process comprises the following steps: the total amount of the regeneration waste liquid is 400L, the alkali content of the regeneration waste liquid is 2.2 percent, and the resin transformation rate is 72.6 percent.

Case 1: the total amount of the regeneration waste liquid is 360L, the alkali content of the regeneration waste liquid is 1.8 percent, the resin transformation rate is 86.2 percent, the transformation improvement rate is 10 percent, and the waste liquid reduction rate is 18.7 percent.

Case 2: the total amount of the regeneration waste liquid is 360L, the alkali content of the regeneration waste liquid is 1.5 percent, the resin transformation rate is 82.5 percent, the transformation improvement rate is 10 percent, and the waste liquid reduction rate is 13.6 percent.

Case 3: the total amount of the regeneration waste liquid is 300L, the alkali content of the regeneration waste liquid is 1.7%, the resin transformation rate is 81.4%, the transformation improvement rate is 25%, and the waste liquid reduction rate is 12.1%.

According to the data, the invention can effectively reduce the regeneration waste liquid, improve the transformation rate of the resin, reduce the environmental protection pressure to a great extent and ensure the normal operation of the equipment.

The invention improves the regeneration process, takes part of fresh regenerant to regenerate the resin which is polluted due to failure, the regenerated liquid contains a large amount of salt substances and has low alkali content concentration, then the regenerated resin is further strengthened and regenerated by the rest of regenerant, the discharged regenerated liquid returns to the regeneration tank to be circulated for three times until the regenerated waste liquid is discharged, the regenerated resin can be flushed by the water stored in the recycle water circulation tank in the last step, the process is also divided into two steps, the resin is flushed to the regeneration tank by part of water in the first step for preparing the next recycled regenerant, the resin is flushed by the rest of water in the second step for multiple times and then is discharged, and then the resin is flushed to the circulation tank by process desalted water for storage, thereby the amount of the regenerated waste liquid can be reduced, the content is also reduced, and the flushing water amount is reduced, the regeneration efficiency is improved, the transformation rate of the resin can be improved, the environmental protection pressure is reduced to a great extent, and the normal operation of equipment is ensured.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.