CN205121366U - Hydrogen chloride synthesis purity control system - Google Patents

Abstract

The utility model discloses a hydrogen chloride synthesis purity control system relates to the technical field of chlorine industry, thereby for solving in the current hydrogen chloride production process because the hydrogen chloride purity of unable effective control output and influence the subsequent product quality according to the feeding volume of hydrogen chloride purity regulation chlorine and hydrogen to the problem of great pollution is caused the environment. Hydrogen chloride synthesis purity control system includes hydrogen chloride concentration automatic control device, and this controlling means is including being used for the receiving circuit and the DCS that receive chlorine flowmeter signal, hydrogen stream gauge signal and incoming signal always to control the ware, and one side that the ware was always controlled to DCS links to each other with receiving circuit and is used for obtaining the signal of receiving circuit output, and its opposite side output signal gives chlorine governing valve or hydrogen governing valve. Through the utility model discloses a hydrogen chloride synthesis system can reach the purpose of adjusting the hydrogen chloride purity of output, convenient to use, and degree of automation is high, and the significantly reduced production of accessory substance sodium hypochlorite or liquid chlorine, spent acid etc..

Description

A kind of hydrogen chloride synthesis Pureness control system

Technical field

The utility model relates to the technical field of chlorine industry, is specifically related to a kind of hydrogen chloride synthesis Pureness control system.

Background technology

HCl is widely used in the industries such as dyestuff, medicine, food, printing and dyeing, leather, metallurgy, and especially as one of the primary raw material of production Polyvinylchloride, its consumption is very large.The Polyvinylchloride consumed in the world reaches more than 3,000 ten thousand tons/year, and in the production run of Polyvinylchloride, the purity of hydrogen chloride directly has influence on quality and the cost of Polyvinylchloride.Traditional industry controls the purity of hydrogen chloride more than 94%, the chlorine of 1% ~ 6% can be caused to remain, this part remaining chlorine can be used as liquid chlorine export trade in the area that China's southeast chemical industry is comparatively flourishing, but in western China, often the transportation cost of liquid chlorine is greater than its selling price, can cause puzzlement to enterprise.This part liquid chlorine process has two kinds of methods, and one is that remaining liquid chlorine is converted to sodium hypochlorite consumption, but adopts environment treating facility disposal cost can be caused in this way higher; Another kind be utilized by remaining liquid chlorine garden industry sufficient raw hydrogen to balance the chlorine of redundance, complex operation and hydrogen gas consumption is comparatively large, cost is higher.

To sum up, in the production run of traditional chlorinated hydrogen, due to good management cannot be realized to the purity of hydrogen chloride, can cause producing a large amount of accessory substance sodium hypochlorite or liquid chlorine, spent acid etc., not only affect follow-up product quality, and these accessory substances also can cause larger pollution to environment, greatly can increase the cost of environmental protection treatment simultaneously.

Utility model content

The purpose of this utility model is to provide a kind of hydrogen chloride synthesis Pureness control system, for solving in existing hydrogen chloride production process, due to the hydrogen chloride purity exported and the inlet amount regulating chlorine and hydrogen according to hydrogen chloride purity effectively cannot be controlled, can cause producing a large amount of accessory substance sodium hypochlorite, liquid chlorine and spent acid etc., not only affect subsequent product quality, and larger pollution can be caused to environment, thus greatly increase the problem of rear current cost.

To achieve these goals, the utility model provides following technical scheme: a kind of hydrogen chloride synthesis Pureness control system, comprise hydrogen feed mechanism and chlorine feed mechanism, described hydrogen feed mechanism comprises hydrogen regulating valve and hydrogen flowmeter, described hydrogen flowmeter is for monitoring and showing the hydrogen flowing quantity size by described hydrogen regulating valve, described chlorine feed mechanism comprises chlorine variable valve and cl gas flow gauge, described cl gas flow gauge is for monitoring and showing the chlorine flowrate size by described chlorine variable valve, described hydrogen chloride synthesis Pureness control system also comprises hydrogen cloride concentration automaton, described hydrogen cloride concentration automaton comprises for receiving described cl gas flow gauge signal, the receiving circuit of described hydrogen flowmeter signal and input signal and DCS General controller, the side of described DCS General controller is connected with described receiving circuit and for obtaining the signal that described receiving circuit exports, the opposite side of described DCS General controller outputs signal to chlorine variable valve or hydrogen regulating valve.

Compared to prior art, hydrogen chloride synthesis Pureness control system described in the utility model has following advantage: the utility model has additional hydrogen cloride concentration automaton in traditional hydrogen chloride synthesis system, this hydrogen cloride concentration automaton can regulate according to the aperture of signal to chlorine variable valve and hydrogen regulating valve of input, thus reach the object that the purity of the hydrogen chloride exported is regulated, easy to use, automaticity is high.Meanwhile, above-mentioned control system can also control the aperture of chlorine variable valve according to the hydrogen chloride purity after need regulating, thus the reaction rate of chlorine in hydrogen chloride synthesis system is improved.The hydrogen chloride adopting native system to export is that raw material makes subsequent product, particularly make in the process of Polyvinylchloride, owing to not containing chlorine residue, thus ensure that subsequent product is preparing the safety and stability in vinyl chloride monomer technique especially more reliably, the raising of synthetic gas purity simultaneously, decrease the generation of the accessory substance of preorder chlorine operation chlorine residue, decrease the pollution to environment and Environment control cost.

Accompanying drawing explanation

By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and is not thought restriction of the present utility model.In the accompanying drawings:

Fig. 1 shows the structural representation of the hydrogen chloride synthesis Pureness control system according to the utility model embodiment.

Reference numeral:

1-hydrogen regulating valve, 2-hydrogen flowmeter,

3-chlorine variable valve, 4-cl gas flow gauge,

5-hydrogen cloride concentration automaton, 51-receiving circuit,

511-is instrument on the spot, 512-signal transmitting device,

513-signal input unit, 52-DCS General controller,

521-logical operation module, 6-topworks,

7-hydrogen stop valve, 8-chlorine stop valve.

Embodiment

The utility model provides many applicable creative concepts, and this creative concept can be reflected in a large number of in concrete context.The specific embodiment described in following embodiment of the present utility model only as the exemplary illustration of embodiment of the present utility model, and does not form the restriction to the utility model scope.

Below in conjunction with accompanying drawing and concrete embodiment, the utility model will be further described.

The present embodiment provides a kind of hydrogen chloride synthesis Pureness control system, comprise hydrogen feed mechanism and chlorine feed mechanism, hydrogen feed mechanism comprises hydrogen regulating valve 1 and hydrogen flowmeter 2, hydrogen flowmeter 2 is for monitoring and showing the hydrogen flowing quantity size by hydrogen regulating valve 1, chlorine feed mechanism comprises chlorine variable valve 3 and cl gas flow gauge 4, and cl gas flow gauge 4 is for monitoring and showing the chlorine flowrate size by chlorine variable valve 3.The inlet amount that hydrogen cloride concentration automaton 5 can control in chlorine feed mechanism and hydrogen feed mechanism is respectively adopted in this control system.Hydrogen cloride concentration automaton 5 comprises the receiving circuit 51 and DCS General controller 52 that receive hydrogen flowmeter 2 signal, cl gas flow gauge 4 signal and input signal.The side of DCS General controller 52 is for obtaining the signal transmission in receiving circuit 51, and the signal transmission that the opposite side of DCS General controller 52 is used for export from DCS General controller 52 is to chlorine variable valve 3 or hydrogen regulating valve 1.

Particularly, receiving circuit 51 is hydrogen flowmeter 2 reading from the signal that hydrogen flowmeter 2 receives the signal received from cl gas flow gauge 4 is cl gas flow gauge 4 reading the input signal received is hydrogen chloride purity C before adjustment ₁and need the hydrogen chloride purity C that reaches after adjustment ₂.Data c ₁and C ₂input in DCS General controller 52 in the mode of electric signal, and carry out computing in DCS General controller 52, operation result exports in the mode of electric signal and aperture size for controlling chlorine variable valve 3 or hydrogen regulating valve 1 again.

When improving former hydrogen chloride synthesis system, when can reach the object automatically regulating chlorine variable valve 3 or hydrogen regulating valve 1, only the hydrogen cloride concentration automaton 5 that need be equipped with in original system described in the present embodiment just can, change little, reduced investment, and can reach easy, the efficient feature of hydrogen chloride Pureness control.

As an optimal way of the present embodiment, receiving circuit 51 comprises and is respectively used to receive two of hydrogen flowmeter 2 signal and cl gas flow gauge 4 signal and overlaps instrument 511 and signal transmitting device 512 on the spot, and for receiving the hydrogen cloride concentration C before adjustment ₁with the hydrogen chloride purity C that need adjust ₂signal input unit 513.Instrument 511 refers to the instrument be arranged near object and controlled device on the spot.In the present embodiment two on the spot instrument 511 be arranged near hydrogen flowmeter 2 respectively and cl gas flow gauge 4 annex, for the numerical value in monitoring hydrogen flowmeter 2 and cl gas flow gauge 4 form digital signal therein, this digital data transmission gives the transmitter be connected with instrument 511 on the spot.Transmitter refers to that the output signal of sensor is changed into can by the converter of the signal of controller identification.Digital signal transition in instrument 511 is on the spot the electric signal that can be identified by DCS General controller 52 by transmitter in the present embodiment.Signal input unit 513 is man-machine dialog interface, needs the hydrogen cloride concentration C reached after can directly inputting adjustment on the surface ₂, the hydrogen cloride concentration C before adjustment ₁by hydrogen cloride concentration detector, detection data are transferred in this signal input unit 513, certainly, the hydrogen cloride concentration C before adjustment ₁also can directly be transferred in DCS General controller 52.Wherein, in order to easy to detect, hydrogen cloride concentration detector adopts fixed detector, is specifically well known to those skilled in the art, therefore no longer sets forth at this.

Certainly, receiving circuit 51 also can adopt a signal input unit 513, by manually reading chlorine flowrate meter 4 reading hydrogen flowmeter 2 reading and hydrogen chloride purity C before adjustment ₁, and and need the hydrogen chloride purity C that reaches after adjustment ₂adopt in artificial input signal input unit 513 in the lump, then be transferred in the logical operation module 521 of DCS General controller 52 by signal input unit 513, but this mode automaticity is low, adjustment is inconvenient, and sensitivity is low, and efficiency is poor.

It should be noted that, in above-mentioned DCS General controller 52, be provided with logical operation module 521, computing can be carried out according to the signal received, and operation result is outputted to variable valve in the mode of electric signal and is used for the aperture size of regulating and controlling valve.The internal calculation of this logical operation module 521 is mainly adopted in two ways, sets forth respectively hereinafter.

Mode one:

The Proportional coefficient K of hydrogen flowmeter 2 reading and cl gas flow gauge 4 reading before known adjustment ₁, hydrogen chloride purity C ₁and need the purity C adjusting hydrogen chloride ₂.

In the reactive system of hydrogen chloride, reaction equation is: Cl ₂+ H ₂+ H' ₂→ 2HCl+H' ₂

In reaction equation: Cl ₂refer to the chlorine participating in reactive system reacting;

H ₂refer to the hydrogen participating in reactive system reacting;

H' ₂refer to hydrogen excessive in reactive system;

HCl refers to the hydrogen chloride generated in reactive system.

In reactive system, feed rate that is constant at the feed rate of chlorine, hydrogen is constant, the hydrogen chloride purity of generation is also constant, reacts constant speed in reactive system and carries out quantitatively, according to reaction equation, known: $F_{{\mathrm{Cl}}_2}=F_{H_2}^{\′}=\frac{1}{2}{F}_{HCl}$ Namely $F_{HCl}=F_{{\mathrm{Cl}}_2}+F_{H_2}^{\′}=2F_{{\mathrm{Cl}}_2}$

$F_{H_2}^{\′}=F_{H_2}-F_{{H_2}^{\′}}$

$F_{HCl}+F_{{H_2}^{\′}}=F_{{\mathrm{Cl}}_2}+F_{H_2}^{\′}+F_{{H_2}^{\′}}=F_{{\mathrm{Cl}}_2}+F_{H_2}$

Then: $C=F_{HCl}/(F_{{\mathrm{Cl}}_2}+F_{H_2})=2F_{{\mathrm{Cl}}_2}/(F_{{\mathrm{Cl}}_2}+F_{H_2})$ Be designated as equation S1-1.

In formula, refer in reactive system the flow participating in the chlorine reacted;

refer in reactive system the flow participating in the hydrogen reacted;

refer to hydrogen flowing quantity excessive in reactive system;

F _hClrefer to the flow of the hydrogen chloride generated in reactive system;

fingering enters the total flow of hydrogen in reactive system;

C refers to the purity of hydrogen chloride in reactive system.

The purity of chlorine and hydrogen is all considered as 100% herein, and other impurity are ignored.

In the controls, hydrogen flowmeter 2 for monitoring and showing the total flow entering hydrogen in reactive system, then

$F_{H_2}=L_{H_2}$

In formula: for the reading of hydrogen flowmeter 2.

In this reactive system, the reaction rate of chlorine is 100%, namely the chlorine participating in reacting is equal with the chlorine flowrate entered in reactive system, if but cl gas flow gauge 4 in the present embodiment is nonstandard, there is situation bigger than normal or less than normal in its reading, there is a compensation coefficient in the chlorine flowrate that then reading that demonstrates of this cl gas flow gauge 4 and actual participation are reacted, is R, then the compensation coefficient R value of different cl gas flow gauge is different, and is definite value, when this chlorine flowrate counts normal flow timing, and R=1.

In formula: for the reading of cl gas flow gauge 4.

Suppose that hydrogen flowmeter 2 reading is K with the scale-up factor of chlorine flowrate participating in reacting, then

$L_{H_2}={\mathrm{KF}}_{{\mathrm{Cl}}_2}={\mathrm{KRL}}_{{\mathrm{Cl}}_2}.$

Hydrogen chloride purity C and the relation between Proportional coefficient K and compensation coefficient R.

Can be obtained by equation S1-1,

$\begin{array}{c}C=2F_{{\mathrm{Cl}}_2}/(F_{{\mathrm{Cl}}_2}+F_{H_2})\\ =2{\mathrm{RL}}_{{\mathrm{Cl}}_2}/\left({\mathrm{RL}}_{{\mathrm{Cl}}_2}+{\mathrm{KRL}}_{{\mathrm{Cl}}_2}\right)\\ =2/\left(1+k\right)\end{array}$

Then $K=\frac{2}{C}-1$

Before regulating, hydrogen flowmeter 2 reading is designated as K with the scale-up factor participating in the chlorine flowrate reacted ₁, hydrogen chloride purity is designated as C ₁, need hydrogen flowmeter 2 reading after adjustment to be designated as K with the scale-up factor participating in the chlorine flowrate reacted ₂, the purity of hydrogen chloride is designated as C ₂, then

$\frac{K_1}{K_2}=\frac{\frac{1}{C_1}(2-C_1)}{\frac{1}{C_2}(2-C_2)}=\frac{(2-C_1)C_2}{(2-C_2)C_1}$

Therefore K ₂=(2-C ₂) C ₁k ₁/ [(2-C ₁) C ₂].

According to formula then before adjustment, known and R, just can draw K ₁value, again according to formula K ₂=(2-C ₂) C ₁k ₁/ [(2-C ₁) C ₂], known K ₁, C ₁and C ₂, just can draw K ₂value.After adjustment, by regulating the aperture size of chlorine variable valve 3 and hydrogen regulating valve 1, thus the scale-up factor controlling the reading of hydrogen flowmeter 2 and the reading of cl gas flow gauge 4 is K ₂with the product value of R, the concentration of the hydrogen chloride of output just can be made to be C ₂.Certainly, if do not needing under the prerequisite changing hydrogen chloride total production, then the reading of hydrogen flowmeter 2 is not changing, known k ₂and R, then can according to formula calculate further after need regulating after regulating according to the need calculating gained value, the aperture size of fine setting chlorine variable valve 3, just can play the effect of adjustment hydrogen chloride purity.Namely in the manner, the aperture size of hydrogen regulating valve 1 is not regulated, will result of calculation export in the mode of electric signal and be transported in chlorine variable valve 3, control action is played to the aperture size of chlorine variable valve 3, thus makes the concentration of hydrogen chloride exported be C ₂.

Such as, the Proportional coefficient K of hydrogen flowmeter 2 reading and cl gas flow gauge 4 reading before known adjustment ₁be 1.2, hydrogen chloride purity C ₁be 0.9 and need to adjust the purity C of hydrogen chloride ₂be 0.97, then according to formula

K ₂＝(2-C ₂)C ₁K ₁/[(2-C ₁)C ₂]

Can be calculated, K ₂be 1.04, according to K ₂value, known R value again, then can by K ₂flow to chlorine variable valve 3 and hydrogen regulating valve 1 with the product value of R in the mode of electric signal, make the scale-up factor of the reading of hydrogen flowmeter 2 and the reading of cl gas flow gauge 4 be K ₂with the product value of R.Or do not needing, under the prerequisite changing hydrogen chloride total production, can calculate further in DCS General controller 52 value, by this value flows to chlorine variable valve 3 in the mode of electric signal, can be calculated K due to above-mentioned ₂<K ₁if only regulate chlorine variable valve 3, then the aperture of chlorine variable valve 3 should be increased.

Mode two:

Before known adjustment, cl gas flow gauge 4 reading is L ₁, hydrogen chloride purity is C ₁, the hydrogen chloride purity after need adjusting is C ₂.

The derivation of equation S1-1 is with in mode one.Then can draw hydrogen chloride purity C and hydrogen flowmeter 2 reading by equation S1-1 cl gas flow gauge 4 reading and the relation between compensation coefficient R.

$\begin{array}{c}C=2F_{{\mathrm{Cl}}_2}/\left(F_{{\mathrm{Cl}}_2}+F_{H_2}\right)\\ =2{\mathrm{RL}}_{{\mathrm{Cl}}_2}/\left({\mathrm{RL}}_{{\mathrm{Cl}}_2}+L_{H_2}\right)\end{array}$

Therefore ${\mathrm{CRL}}_{{\mathrm{Cl}}_2}+{\mathrm{CL}}_{H_2}=2{\mathrm{RL}}_{{\mathrm{Cl}}_2}$

Then $L_{{\mathrm{Cl}}_2}={\mathrm{CL}}_{H_2}/(2R-CR)$

Before regulating, cl gas flow gauge 4 reading is designated as L ₁, hydrogen chloride purity is designated as C ₁, need cl gas flow gauge 4 reading after regulating to be designated as L ₂, the purity of hydrogen chloride is designated as C ₂, then

$\begin{array}{c}\frac{L_1}{L_2}=\frac{C_1{L}_{H_2}/\left(2R-C_{1}R\right)}{C_2{L}_{H_2}/\left(2R-C_{2}R\right)}\\ =\frac{C_1/\left(2-C_1\right)}{C_2/\left(2-C_2\right)}\\ =\frac{C_1\left(2-C_2\right)}{C_2\left(2-C_1\right)}\end{array}$

Therefore L ₂=C ₂l ₁(2-C ₁)/[C ₁(2-C ₂)].

It should be noted that the manner can only be applied to keeps the aperture of hydrogen regulating valve 1 constant, and namely the reading of hydrogen flowmeter 2 is constant, and when without the need to changing hydrogen chloride output.By the aperture size of fine setting chlorine variable valve 3, the effect of adjustment hydrogen chloride purity just can be played.Thus ensureing that subsequent product is preparing the safety and stability in vinyl chloride monomer technique especially more reliably, the raising of synthetic gas purity, decreases the generation of the accessory substance of preorder chlorine operation chlorine residue simultaneously.

Such as, hydrogen flowmeter 2 reading L before known adjustment ₁be 2200, hydrogen chloride purity C ₁be 0.9 and need to adjust the purity C of hydrogen chloride ₂be 0.96, then according to formula

L ₂＝C ₂L ₁(2-C ₁)/[C ₁(2-C ₂)]

Can be calculated, L ₂be that this numerical value is flowed to chlorine variable valve 3, due to L in the mode of electric signal by 2482.05, DCS General controller 52 ₂>L ₁, the aperture of chlorine variable valve 3 should be increased.

Certainly, if when mode two is applied in and also needs to regulate hydrogen chloride output, then the reading of hydrogen flowmeter 2 can be made to be desirable value according to the aperture of the first manual adjustments hydrogen regulating valve 1 of the hydrogen chloride output that need regulate, and then pass-through mode two goes out cl gas flow gauge 4 reading that need regulate in DCS General controller 52 internal calculation, and output signal to chlorine variable valve 3 and regulate.After above-mentioned manual adjustments hydrogen regulating valve 1, hydrogen flowmeter 2 reading value need be greater than the hydrogen gas consumption calculated according to hydrogen chloride yield meter.Relative to the advantage of mode one, mode two is that mode two can use when DCS General controller 52 cannot read hydrogen flowmeter 2 signal.

Above-mentioned two kinds of modes all can be automatically dull to chlorine variable valve 3 or jointly regulate chlorine variable valve 3 and hydrogen regulating valve 1 according to the needs of hydrogen chloride purity, thus reach the final hydrogen chloride exported and meet required purity.And in said system, the utilization factor of chlorine is higher, be 100%, therefore quality and the cost of the product using hydrogen chloride to make for raw material can not only be affected in follow-up industry, and due to adopt the control system of the present embodiment to produce hydrogen chloride product in chlorine without surplus, so enterprise need not process the chlorine residue of this part, simplify industrial procedure, simultaneously due to the sodium hypochlorite without the need to processing chlorine residue formation or liquid chlorine, spent acid etc., also greatly reduce the cost of environmental pollution and environmental protection treatment.

It is worth mentioning that, the signal that above-mentioned variable valve exports according to DCS General controller 52 regulates, calculating gained signal is flowed to variable valve by DCS General controller 52 can only judge that now variable valve should increase aperture or reduce aperture, constantly increase at variable valve or reduce in the process of aperture, the reading of flowmeter constantly changes and is inputted in DCS General controller 52 through receiving circuit 51 by numerical signal, until the reading of cl gas flow gauge 4 becomes L ₂or the scale-up factor of hydrogen flowmeter 2 reading and cl gas flow gauge 4 reading is K in the continuous computing of the logical operation module 521 of DCS General controller 52 ₂with the product value of R.

In addition, hydrogen regulating valve 1 and chlorine variable valve 3 can adopt pneumatic control valve or solenoid valve, and topworks 6 is also respectively arranged with on hydrogen regulating valve 1 and chlorine variable valve 3, this topworks 6 can receive the electric signal size of DCS General controller 52 output and regulate the aperture of hydrogen regulating valve 1 and chlorine variable valve 3.If such as chlorine variable valve 3 adopts pneumatic control valve, then topworks 6 is according to the electric signal adjustable bleed pressure received, thus reaches the object of adjustment chlorine variable valve 3 aperture.

In addition, chlorine stop valve 8 and hydrogen stop valve 7 also can be respectively arranged with in the hydrogen feed mechanism and chlorine feed mechanism of the present embodiment, to make to cut off hydrogen feed and chlorine feed in time when system malfunctions, ensure the safety and stability of native system.

It should be noted, above-described embodiment is described the utility model instead of limits the utility model, and those skilled in the art can design alternative embodiment when not departing from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and does not arrange element in the claims or step.

Claims (7)

1. a hydrogen chloride synthesis Pureness control system, it is characterized in that, comprise hydrogen feed mechanism and chlorine feed mechanism, described hydrogen feed mechanism comprises hydrogen regulating valve (1) and hydrogen flowmeter (2), described hydrogen flowmeter (2) is for monitoring and showing the hydrogen flowing quantity size by described hydrogen regulating valve (1), described chlorine feed mechanism comprises chlorine variable valve (3) and cl gas flow gauge (4), described cl gas flow gauge (4) is for monitoring and showing the chlorine flowrate size by described chlorine variable valve (3)

Described hydrogen chloride synthesis Pureness control system also comprises hydrogen cloride concentration automaton (5), described hydrogen cloride concentration automaton (5) comprises for receiving described cl gas flow gauge (4) signal, the receiving circuit (51) of described hydrogen flowmeter (2) signal and input signal and DCS General controller (52), the side of described DCS General controller (52) is connected with described receiving circuit (51) and for obtaining the signal that described receiving circuit (51) exports, the opposite side of described DCS General controller (52) is used for outputing signal to chlorine variable valve (3) or hydrogen regulating valve (1).

2. hydrogen chloride synthesis Pureness control system according to claim 1, it is characterized in that, logical operation module (521) is provided with in described DCS General controller (52), in logical operation module (521), carry out computing according to the signal in obtained receiving circuit (51), and operation result output is used for the aperture size controlling described chlorine variable valve (3) or described hydrogen regulating valve (1).

3. hydrogen chloride synthesis Pureness control system according to claim 2, is characterized in that, described cl gas flow gauge (4) signal that described receiving circuit (51) receives is described cl gas flow gauge (4) reading described hydrogen flowmeter (2) signal that described receiving circuit (51) receives is described hydrogen flowmeter (2) reading the input signal that described receiving circuit (51) receives is hydrogen chloride purity C before adjustment ₁and need the hydrogen chloride purity C that reaches after adjustment ₂;

The signal that described receiving circuit (51) exports in described DCS General controller (52) is cl gas flow gauge (4) reading hydrogen flowmeter (2) reading the purity C of hydrogen chloride before adjustment ₁, need adjust after the purity C of hydrogen chloride ₂and the compensation coefficient R of cl gas flow gauge, the scale-up factor that can be calculated hydrogen flowmeter (2) reading and chlorine flowrate in DCS General controller (52) is K, namely before regulating, scale-up factor is designated as K ₁, after regulating, scale-up factor is designated as K ₂, according to above-mentioned known number in DCS General controller (52) according to formula

K ₂＝(2-C ₂)C ₁K ₁/[(2-C ₁)C ₂]

The Proportional coefficient K after need regulating can be calculated ₂, then K ₂be the scale-up factor of the reading of hydrogen flowmeter (2) and the reading of cl gas flow gauge (4) with the product value of R, the product value calculating gained is sent to chlorine variable valve (3) or hydrogen regulating valve (1) in the mode of electric signal and controls the aperture of hydrogen regulating valve (1) and chlorine variable valve (3) by DCS General controller (52).

4. hydrogen chloride synthesis Pureness control system according to claim 2, is characterized in that, described cl gas flow gauge (4) signal that described receiving circuit (51) receives is described cl gas flow gauge (4) reading the input signal that described receiving circuit (51) receives is for regulating front hydrogen chloride purity C ₁and need the hydrogen chloride purity C that reaches after regulating ₂,

The signal that described receiving circuit (51) exports in described DCS General controller (52) is cl gas flow gauge (4) reading existing hydrogen chloride purity C ₁and the hydrogen chloride purity C after need adjusting ₂, before regulating, cl gas flow gauge (4) reading is designated as L ₁, after regulating, cl gas flow gauge (4) reading is designated as L ₂, according to above-mentioned data in DCS General controller (52) according to formula

L ₂＝C ₂L ₁(2-C ₁)/[C ₁(2-C ₂)]

The reading L of the cl gas flow gauge (4) after need regulating can be calculated ₂, then the result of calculating gained is sent to chlorine variable valve (3) in the mode of electric signal and controls the aperture of chlorine variable valve (3) by DCS General controller (52).

5. hydrogen chloride synthesis Pureness control system according to claim 1, it is characterized in that, described receiving circuit (51) comprises and is respectively used to receive two of hydrogen flowmeter (2) signal and cl gas flow gauge (4) signal and overlaps instrument (511) and signal transmitting device (512) on the spot, and for receiving the hydrogen chloride purity C before adjustment ₁with need regulate after hydrogen chloride purity C ₂signal input unit (513).

6. hydrogen chloride synthesis Pureness control system according to claim 1, it is characterized in that, described hydrogen regulating valve (1) and described chlorine variable valve (3) can adopt pneumatic control valve or solenoid valve, and described hydrogen regulating valve (1) and described chlorine variable valve (3) are also respectively arranged with topworks (6), described topworks (6) receives electric signal that described DCS General controller (52) exports and regulates the aperture size of described hydrogen regulating valve (1) and described chlorine variable valve (3).

7. the hydrogen chloride synthesis Pureness control system according to claim 1 ~ 6 any one, it is characterized in that, in described hydrogen feed mechanism and described chlorine feed mechanism, be also respectively arranged with hydrogen stop valve (7) and chlorine stop valve (8).