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Neutralizer for treating oily waste water by chemical neutralization, method and system

A central control system and wastewater technology, applied in chemical instruments and methods, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve problems such as difficult, low-cost treatment, high oil content, etc., to achieve Resolve difficult-to-control, low-cost effects

Active Publication Date: 2011-04-27
里群 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although acid-base neutralization is a very common chemical reaction, neutralizing large volumes of acidic / alkaline wastewater uniformly and precisely to the desired pH in a short period of time is not as simple as in a test tube test
In the prior art, it is very difficult to automatically neutralize oilfield acidic wastewater or alkaline wastewater. The main reasons are: (1) The acid-base neutralization reaction is nonlinear, especially when the pH value is around 3.5 and 10.0 , the acid-base neutralization reaction will produce a sudden jump, that is, a small amount of neutralizing agent will lead to a large change in pH value, resulting in the problem that the neutralization reaction is difficult to control
(2) There is a problem of time lag in the detection instrument, which causes the final result to be inconsistent with the desired result
(3) Although there are a lot of neutralization equipment in the prior art, it is difficult to meet the requirements of accurately, quickly and low-costly treating a large amount of acidic or alkaline wastewater
In addition, the acid wastewater in the oil field has a large oil content, which has a great impact on the probe of the pH meter.
The probe of the pH meter will be polluted by oil, resulting in inaccurate detection values
The above problems have brought great difficulty to the control of acid-base neutralization reaction.

Method used

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  • Neutralizer for treating oily waste water by chemical neutralization, method and system
  • Neutralizer for treating oily waste water by chemical neutralization, method and system
  • Neutralizer for treating oily waste water by chemical neutralization, method and system

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Embodiment 1

[0041] In the first embodiment according to the present invention, the neutralization steps of acidic oily wastewater are as follows:

[0042] Referring to FIG. 2 , in this embodiment, the acidic wastewater is sent into a neutralizer 10 through a sewage lifting pump. The neutralizer used in the present invention can be a cylindrical tubular reactor (not limited to cylindrical). The tubular reactor includes two sections, the first section is used for the neutralization reaction of the first stage, and the second section is used for the neutralization reaction of the second stage. There is an inlet pH meter 20 at the front end (inlet end) of the first section of the neutralizer to measure the inlet water pH value. The neutralizing agent is NaOH and / or HCl, which is fed into the neutralizer through the first feeding port 30 arranged immediately behind the inlet pH meter 20 . The amount of neutralizing agent is determined by the central control system (such as DCS system or othe...

Embodiment 2

[0057]Referring to Fig. 3, in this embodiment, the neutralizer includes a first section and a second section. The acid waste water is lifted to the first section of the pipe neutralizer 10 by the lift pump for first-stage neutralization. An inlet pH meter 20 (the probe is inserted into the pipeline) is installed at the inlet of the neutralizer, and a first feeding port is installed behind the pH meter 20 . The figure shows that the first feeding port is connected to three neutralizer storage tanks 30A, 30B, 30C, and these feeding ports can also be arranged along the radial direction of the pipeline. Wherein the storage tanks 30A and 30B are alkali storage tanks with different concentrations, and 30C is an acid storage tank. The pH meter 20 is used to monitor the pH value of the original wastewater, and the central controller calculates the dosage of the first feeding port according to the pH value and the first target pH value, so as to adjust the pH value of the wastewater t...

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Abstract

The invention relates to a neutralizer for treating acidic or alkaline oily waste water by chemical neutralization, and a method and a system for treating acidic or alkaline oily waste water by chemical neutralization. The neutralizer is a tubular reactor, comprising: a first segment for regulating pH valve of waste water in a rage from 3.5 to 10.5, wherein the first segment comprises a first entrance pH gauge and a first feed inlet; and a second segment for regulating pH valve of waste water in a rage from 6 to 9, wherein the second segment comprises a second entrance pH gauge, a second feed inlet and an export pH gauge; wherein at least one of the first segment and the second segment comprise a ultrasonic mixer, and the ultrasonic mixer is fixed close to the first feed inlet or behind the second feed inlet. The system and the method use the neutralizer. Require for treating mass acidic or alkaline waste water accurately, rapidly and in low cost can be satisfied by the neutralizer, the method and the system of the invention.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for neutralizing acidic or alkaline oily waste water produced in the petroleum exploitation process and a device and system for implementing the method. Background technique [0002] In the process of oilfield production and operation, a large amount of acidic wastewater or alkaline wastewater will be generated due to reasons such as well washing and acidification, and the amount of acidic wastewater generated is even greater. This acidic water has a low pH and a high oil content in the water. If it is reinjected into the ground without proper treatment, it will cause serious damage to the oil layer, and if it is discharged into the environment, it will have a serious impact on the ecological environment and violate relevant environmental protection regulations. Therefore, the acidic wastewater or alkaline waste must be properly treated before being discharged or r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66
Inventor 里群王嘉麟
Owner 里群