CN101716430B

CN101716430B - Mechanical settling tank ammonia water and tar oil interface detector and measurement control method

Info

Publication number: CN101716430B
Application number: CN2009102325401A
Authority: CN
Inventors: 龙霄; 陈云; 张爱国
Original assignee: JIANGSU HONGGUANG METER FACTORY CO Ltd
Current assignee: JIANGSU HONGGUANG METER FACTORY CO Ltd
Priority date: 2009-12-07
Filing date: 2009-12-07
Publication date: 2011-06-15
Anticipated expiration: 2029-12-07
Also published as: CN101716430A

Abstract

The invention discloses a mechanical settling tank ammonia water and tar oil interface detector and a measurement control method. A display (1) is arranged above a base (2), a circuit board (5) is arranged in the base (2), a measurement pipe (3) is arranged below the base (2) and is internally provided with a plurality of temperature sensors (4) according to the position height, the display (1) and the temperature sensors (4) are connected to the circuit board (5) through signal lines; the part of the center of a settling tank (6), which is 300 mm apart from an oil outlet, is provided with the interface detector through a thread or flange, the high oil position and the low oil position of the settling tank (6) are respectively provided with an oil pressure valve (7) and an adjusting valve(8) which are connected with the interface detector through signal lines. The interface detector can make a temperature-tar oil purity-tar oil height coordinate graph by using software programming according to a heat radiation measurement principle, thereby controlling the discharge of tar oil and realizing the zero consumption of tar oil dehydration.

Description

Mechanical settling tank ammonia water and tar oil interface detector and measurement control method

Technical field

The present invention relates to ammonia water and tar oil interface detector and measure control method, be specifically related to a kind of mechanical settling tank ammonia water and tar oil interface detector and measure control method.

Background technology

As everyone knows, mechanizeding ammonia clarifying groove is Gas Company or the coke-oven plant used equipment of tar that is used to purify, tar, ammoniacal liquor and tar slag are separated, mainly, carry out dynamic static separation according to ammoniacal liquor, tar and tar slag density contrast and the inconsistent physical property of profit.Dynamic static separation process is the process of a variations in temperature in fact, before ammonia water and tar oil enters mechanical settling tank, two kinds of liquid at high temperature mixes mutually and is dissolved in together and flows into defecator with pipeline, two mixed liquors slowly flow forward after directly going into defecator, because the density contrast and the immiscible physical characteristic of profit of ammonia water and tar oil, tar slowly breaks away from the ammoniacal liquor high-temperature region and sinks, the little ammoniacal liquor of density is in the superiors, in the middle of tar is positioned at, tar slag sinks to the bottom, the temperature of slowly sinking and being stuck in the tar in the defecator reduces gradually, temperature low tar concentration more is high more, and the high more sinking of concentration is fast more, and the tar slag that is deposited in bottom land is delivered to outside the drain tank of leting slip a remark by drag conveyor, tar then flow to the tar groove by liquor-level regulator, the ammoniacal liquor after the clarification through the top overflow to the cyclic ammonia water groove.

In separation process, control intermediate layer level height is the key point of its automaticity height, is often adopting in the production process in the past: one, pressure measurement method, two, the float-ball type interface level measurement, three, radio frequency admittance Interface Control, four, artificial regular discharge.

It is feasible that the method at pressure type measurement interface is analyzed theoretically, but in the actual measurement process often because carry ammoniacal liquor secretly in the thickness of ammoniacal liquor, tar emulsion layer, tar precipitation purity height, tar layer and tar is sticky and charing to the influence at pressurized position, it is too high to cause extruding the tar ammonia content that comes at last, so this method and infeasible.

Float-ball type interface instrument is that people are to the Utopian product of operating mode, do not have sticky, do not have emulsion layer, interface can adopt the method under the state very clearly, but in mechanical settling tank, have the emulsion layer of sticky tar, height inequality, the tar charring layer of easy charing fouling, when charring layer sticks on the spheroid, make that calculating proportion spheroid weight well slowly becomes heavy and sinks originally.

Radio frequency admittance interface instrument separates fully at two media, do not have under the less environment of interlayer and bag solution and emulsion layer is a very desirable interface instrument, but in mechanical settling tank because ammoniacal liquor-tar be dynamic separation, two media separates unclear, tar purity becomes notch cuttype from bottom to top, and radio frequency interface instrument measurement parameter is relevant with the measured medium dielectric constant, it is very big that the dielectric constant of tar ammonia two media differs, what of contained ammonia vol directly cause measured signal true and false in the tar layer, and the signal that makes radio frequency interface instrument measure is hard to tell the height of tar.

Under the situation that above-mentioned several measuring instruments are had no result, press oil all by manual adjustment, the wave band formula is pressed oil, but because ammoniacal liquor-tar oil interface can't be stablized in the defecator, cause exporting tar water and the water outlet oil-containing exceeds standard, have a strong impact on the quality of tar and cyclic ammonia water, increase the energy consumption in the dehydration of tar process, influence the ordinary production of tar workshop and coke oven, that this method is regulated is frequent, workload is big, environment is abominable, poor stability, fluctuating error greatly, control lag.

Summary of the invention

The objective of the invention is to: a kind of mechanical settling tank ammonia water and tar oil interface detector is provided and measures control method, this interface instrument is according to the principle of hot radiation measurement, in conjunction with its temperature radiation rule, adopt the digital temperature observation and control technology, utilize software programming to produce temperature～tar purity～tar height coordinate figure, thereby control discharging tar is reduced to below 4% tar ammonia content, thermal dehydration can not satisfy quality requirement, realizes that dehydration of tar zero consumes.

Technical solution of the present invention is: this interface instrument comprises display, base, measuring tube, temperature sensor and circuit board, display is installed above base, mounting circuit boards in base, below base, install and measure pipe, according to position a plurality of temperature sensors of just arranging, display and temperature sensor are attached to circuit board by holding wire in the measuring tube.

Measurement control method of the present invention is: the central authorities at defecator install interface of the present invention instrument apart from 300 millimeters places of pressure oil export by screw thread or flange, high oil level and low oil level place at defecator install pressure fuel tap and control valve respectively, press fuel tap and control valve to connect the interface instrument by holding wire.

During work, differing heights place tar temperature in the temperature sensor measurement defecator, be converted into corresponding height by the processor of circuit board and concern that with purity coordinate diagram shows on display, and press the unlatching of fuel tap and control valve and open size by the controller control of circuit board.

Interface of the present invention instrument is simple in structure, easy for installation, flexible operation, measure accurately, control is steady, and integrated detection presses oil to reduce labor intensity of operating personnel, improved operating environment, stablize and reduced tar water, tar water is by reducing to more than 15% below 4%, and tar need not dehydration, realized that dehydration of tar zero consumes, save steam consumption, stopped the generation of cyclic ammonia water band oil accident, for the coke oven ordinary production creates good conditions.

Description of drawings

Fig. 1 is an interface of the present invention instrument schematic diagram

Fig. 2 is that the measurement control of Fig. 1 connects schematic diagram

Among the figure: 1, display, 2, base, 3, measuring tube, 4, temperature sensor, 5, circuit board, 6, defecator, 7, press fuel tap, 8, control valve.

The specific embodiment

Further specify technical solution of the present invention below in conjunction with drawings and Examples, embodiment should not be construed as the restriction to technical solution.

As shown in Figure 1, this interface instrument comprises display 1, base 2, measuring tube 3, temperature sensor 4 and circuit board 5, display 1 is installed above base 2, mounting circuit boards 5 in base 2, below base 2, install and measure pipe 3, according to position a plurality of temperature sensors 4 of just arranging, display 1 and temperature sensor 4 are attached to circuit board 5 by holding wire in the measuring tube 3.

Measurement control method of the present invention is: the central authorities at defecator 6 install interface of the present invention instrument apart from 300 millimeters places of pressure oil export by screw thread or flange, high oil level and low oil level place at defecator 6 install pressure fuel tap 7 and control valve 8 respectively, press fuel tap 7 and control valve 8 to connect the interface instrument by holding wire.

At present, the degree of depth of the defecator of domestic standard is 3.2 meters, and the control of emulsion layer and ammoniacal liquor highly is 1.6 meters, just can control and measure the tar height as long as therefore measure the temperature of the 1.6 meters sections in lower end; For this reason, bury the multi-point temp sensor underground in the measuring tube of interface instrument, per 100 millimeters are buried a temperature sensor, and 1.6 meters are just buried 16 temperature sensors; In defecator, emulsion layer upwards is an ammoniacal liquor, and the temperature that emulsion layer is upwards corresponding is 75 ℃, and the dielectric layer between 68-75 ℃ is the tar layer that contains 15% left and right sides ammoniacal liquor, therefore, wants to improve the discharge quality of tar, just must be located at the highest temperature controlling point below 68 ℃; For this reason, all being that ammoniacal liquor or the tar that contains 15% ammoniacal liquor and the medium more than 68 ℃ are set at 4mA in the defecator on display, corresponding each temperature spot is 1mA, 16 corresponding 16mA of temperature spot, the gamut scope is 4-20mA, on display, can directly read the height of tar, and press the unlatching of fuel tap and control valve and open size by the control of interface instrument.

During work, temperature sensor 4 is measured differing heights place tar temperature in the defecator 6, be converted into corresponding height by the processor of circuit board 5 and concern that with purity coordinate diagram shows on display 1, and press the unlatching of fuel tap 7 and control valve 8 and open size by the controller control of circuit board 5.

Claims

1. mechanical settling tank ammonia water and tar oil interface detector, it is characterized in that: this interface instrument comprises display (1), base (2), measuring tube (3), temperature sensor (4) and circuit board (5), display (1) is installed in top at base (2), mounting circuit boards (5) in base (2), install and measure pipe (3) in the below of base (2), according to the position a plurality of temperature sensors (4) of just arranging, display (1) and temperature sensor (4) are attached to circuit board (5) by holding wire in the measuring tube (3).

2. the measurement control method of mechanical settling tank ammonia water and tar oil interface detector as claimed in claim 1, it is characterized in that measuring control method is: the central authorities at defecator (6) pass through screw thread or flange installation interface instrument apart from 300 millimeters places of pressure oil export, high oil level and low oil level place at defecator (6) install pressure fuel tap (7) and control valve (8) respectively, press fuel tap (7) and control valve (8) to connect the interface instrument by holding wire.