Safety interlocking protection device for hydrogen chloride synthetic furnace

Abstract

The utility model discloses a safety interlocking protection device for a hydrogen chloride synthetic furnace, which comprises a synthetic furnace body, the bottom of the synthetic furnace body is connected with a hydrogen delivery pipe and a chlorine delivery pipe, and the top of the side surface of the synthetic furnace body is provided with a hydrogen chloride discharge pipe; a hydrogen pressure transmitter, a first hydrogen orifice plate flowmeter, a second hydrogen orifice plate flowmeter, a synthetic furnace hydrogen flow regulating valve and a synthetic furnace hydrogen flow stop valve are sequentially arranged on the hydrogen conveying pipe from the gas inlet to the synthetic furnace body; a chlorine pressure transmitter, a first chlorine orifice plate flowmeter, a second chlorine orifice plate flowmeter, a synthetic furnace chlorine flow regulating valve and a synthetic furnace chlorine flow stop valve are sequentially arranged on the chlorine conveying pipe from the gas inlet to the synthetic furnace body; and the hydrogen chloride discharge pipe is connected with a hydrogen chloride pressure transmitter. According to the utility model, the automation level of the hydrogen chloride synthetic furnace is comprehensively improved, and potential safety hazards caused by manual operation are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen chloride synthetic technique field, specifically is a hydrogen chloride synthetic furnace safety interlock protection device. BACKGROUND

[0002] In chlor alkali production, hydrogen chloride synthetic furnace as the equipment of upper and lower link in whole production, has very important function, one aspect consumes the chlorine gas and hydrogen gas of electrolytic procedure generation, the other side provides the qualified hydrogen chloride gas for downstream VCM synthetic procedure. Once into the synthetic furnace chlorine gas flow is greater than hydrogen gas flow, will occur violent reaction with the acetylene gas of downstream VCM synthetic procedure of production chain, causes VCM synthetic procedure mixer explosion-proof membrane rupture even explosion and other malignant accidents, causes great security production hidden danger to chlor alkali production, and when synthetic furnace pressure rises, will cause synthetic furnace explosion-proof membrane rupture, hydrogen chloride gas exhalation, causes environmental protection event. Therefore, ensure that synthetic furnace safe and stable operation is the most important in whole chlor alkali production. General industry adopts the safety interlock scheme provided by hydrogen chloride synthetic furnace manufacturer, and this scheme only provides protection for the safe operation of the synthetic furnace itself, and does not provide emergency protection for the over-chlorination and over-pressure of the synthetic furnace.

[0003] The utility model discloses a novel synthetic furnace emergency protection device, including synthetic furnace, the gas inlet of synthetic furnace is connected with hydrogen gas self buffer tank and chlorine gas self buffer tank through the pipeline, hydrogen gas self buffer tank and chlorine gas self buffer tank are provided with hydrogen gas cut -out automatic valve and chlorine gas cut -out automatic valve respectively on the pipeline leading to synthetic furnace, hydrogen gas self buffer tank and chlorine gas self buffer tank are connected with nitrogen gas source on the pipeline leading to synthetic furnace, and the outlet of nitrogen gas source is equipped with nitrogen gas purging automatic valve, and nitrogen gas source leads into synthetic furnace for purging the hydrogen chloride generated in synthetic furnace, which can immediately manually operate for emergency shutdown, protect the stable operation of the synthetic furnace system, reduce environmental pollution and reduce the explosion hazards of the synthetic furnace by adding two manual stop valves and exhaust valves on the instrument air source pipe of the chlorine hydrogen automatic valve and the nitrogen automatic valve when abnormal conditions occur in the synthetic furnace.

[0004] The above-mentioned patent provides a synthetic furnace emergency protection device, which can provide emergency protection for the synthetic furnace through the manual stop valve and the exhaust valve. However, when an emergency occurs in the synthetic furnace, explosion is easy to occur, and manual control of the valve will bring great risk to the workers, which is not conducive to safety production. UTILITY MODEL CONTENTS

[0005] The utility model discloses a hydrogen chloride synthetic furnace safety interlock protection device, which aims to improve the problem that the existing synthetic furnace is easy to explode when an emergency occurs, and manual control of the valve will bring great risk to the workers, which is not conducive to safety production.

[0006] This utility model is implemented as follows:

[0007] A safety interlock protection device for a hydrogen chloride synthesis furnace includes a synthesis furnace body. A hydrogen supply pipe and a chlorine supply pipe are connected to the bottom of the synthesis furnace body. A hydrogen chloride discharge pipe is located on the top side of the synthesis furnace body. From the inlet to the synthesis furnace body, the hydrogen supply pipe is sequentially equipped with a hydrogen pressure transmitter, a first hydrogen orifice flow meter, a second hydrogen orifice flow meter, a synthesis furnace hydrogen flow regulating valve, and a synthesis furnace hydrogen flow shut-off valve. Similarly, from the inlet to the synthesis furnace body, the chlorine supply pipe is sequentially equipped with a chlorine pressure transmitter, a first chlorine orifice flow meter, a second chlorine orifice flow meter, a synthesis furnace chlorine flow regulating valve, and a synthesis furnace chlorine flow shut-off valve. A hydrogen chloride pressure transmitter is connected to the hydrogen chloride discharge pipe.

[0008] Preferably, the bottom of the synthesis furnace body is provided with a pipe joint, which is used to connect to the hydrogen delivery pipe and the chlorine delivery pipe.

[0009] Preferably, a nitrogen supply pipe is provided behind the hydrogen flow cut-off valve of the synthesis furnace along the hydrogen supply pipe, and a nitrogen charging valve for the synthesis furnace is connected to the nitrogen supply pipe.

[0010] Preferably, the hydrogen chloride discharge pipe is connected to a hydrogen chloride to VCM pipe and a hydrogen chloride to absorption pipe respectively after the hydrogen chloride pressure transmitter, for conveying hydrogen chloride to the corresponding subsequent processes.

[0011] Preferably, a hydrogen chloride to VCM flow regulating valve is installed on the hydrogen chloride to VCM pipe, and the hydrogen chloride to VCM flow regulating valve is used to regulate the flow rate of hydrogen chloride to VCM.

[0012] Preferably, a hydrogen chloride desorption flow regulating valve is installed on the hydrogen chloride desorption tube, and the hydrogen chloride desorption flow regulating valve is used to control the flow rate of hydrogen chloride desorption.

[0013] Preferably, an explosion-proof membrane is installed on the top of the synthesis furnace body, and the explosion-proof membrane is detachably connected to the synthesis furnace body.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model comprehensively improves the automation level of the hydrogen chloride synthesis furnace, reduces safety hazards caused by human operation, and fundamentally eliminates safety and environmental accidents caused by over-chlorination of the synthesis furnace or rupture of the explosion-proof membrane due to various equipment and process failures, effectively ensuring the safe and stable operation of the chlor-alkali plant.

[0016] 2. The utility model discloses a hydrogen chloride synthesis furnace explosion -proof membrane is equipped on the top of synthesis furnace, is convenient in the inside pressure of synthesis furnace is too big and triggers rupture, and the overpressure gas in the furnace is released quickly, prevents the explosion accident from happening. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure diagram of the interlock protection device of the utility model;

[0018] Figure 2 It is the interlock logic diagram of the hydrogen chloride synthesis furnace of the utility model.

[0019] In the drawing: 1, synthesis furnace body;11, synthesis furnace explosion -proof membrane;12, pipe joint;2, hydrogen gas delivery pipe;21, hydrogen gas pressure transmitter;22, first hydrogen gas orifice plate flowmeter;23, second hydrogen gas orifice plate flowmeter;24, synthesis furnace hydrogen gas flow regulating valve;25, synthesis furnace hydrogen gas flow cut -out valve;3, chlorine gas delivery pipe;31, chlorine gas pressure transmitter;32, first chlorine gas orifice plate flowmeter;33, second chlorine gas orifice plate flowmeter;34, synthesis furnace chlorine gas flow regulating valve;35, synthesis furnace chlorine gas flow cut -out valve;4, nitrogen gas delivery pipe;41, synthesis furnace nitrogen filling valve;5, hydrogen chloride discharge pipe;51, hydrogen chloride pressure transmitter;6, hydrogen chloride VCM -removal pipe;61, hydrogen chloride VCM -removal flow regulating valve;7, hydrogen chloride absorption -removal pipe;62, hydrogen chloride absorption -removal flow regulating valve. DETAILED DESCRIPTION

[0020] In the utility model, unless another explicit provision and limitation, the terms "installation", "link", "connection", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements.For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning in the utility model.

[0021] The following will be further explained in conjunction with the drawings and specific embodiments:

[0022] Embodiment 1

[0023] As Figure 1As shown, a safety interlock protection device for a hydrogen chloride synthesis furnace includes a furnace body 1, which is used to synthesize hydrogen chloride. A hydrogen supply pipe 2 and a chlorine supply pipe 3 are connected to the bottom of the furnace body 1. The hydrogen supply pipe 2 supplies hydrogen into the furnace body 1, and the chlorine supply pipe 3 supplies chlorine into the furnace, facilitating the reaction of hydrogen and chlorine to synthesize hydrogen chloride. A hydrogen chloride discharge pipe 5 is located on the top side of the furnace body 1; the hydrogen chloride discharge pipe 5 facilitates the discharge of the synthesized hydrogen chloride. The hydrogen delivery pipe 2, from the inlet to the synthesis furnace body 1, is equipped with a hydrogen pressure transmitter 21, a first hydrogen orifice flow meter 22, a second hydrogen orifice flow meter 23, a synthesis furnace hydrogen flow regulating valve 24, and a synthesis furnace hydrogen flow shut-off valve 25. The hydrogen pressure transmitter 21 is used to measure the hydrogen pressure in the hydrogen delivery pipe 2. The first hydrogen orifice flow meter 22 and the second hydrogen orifice flow meter 23 facilitate accurate determination of the hydrogen flow rate, thereby facilitating subsequent determination of the hydrogen to chlorine ratio in the furnace. The synthesis furnace hydrogen flow regulating valve 24 facilitates the adjustment of the hydrogen flow rate in the hydrogen delivery pipe 2, and the synthesis furnace hydrogen flow shut-off valve 25 is used to close the hydrogen delivery pipe 2. The chlorine delivery pipe 3, from the inlet to the synthesis furnace body 1, is sequentially equipped with a chlorine pressure transmitter 31, a first chlorine orifice flow meter 32, a second chlorine orifice flow meter 33, a synthesis furnace chlorine flow regulating valve 34, and a synthesis furnace chlorine flow shut-off valve 35. A hydrogen chloride pressure transmitter 51 is connected to the hydrogen chloride discharge pipe. The chlorine pressure transmitter 31 is used to measure the pressure in the chlorine delivery pipe 3. The first and second chlorine orifice flow meters 32 and 33 facilitate accurate measurement of the chlorine flow rate. The synthesis furnace chlorine flow regulating valve 34 allows for convenient adjustment of the chlorine flow rate in the chlorine delivery pipe 3. The synthesis furnace chlorine flow shut-off valve 35 is used to close the chlorine delivery pipe 3, preventing further chlorine delivery.

[0024] like Figure 1 As shown, a pipe connector 12 is provided at the bottom of the synthesis furnace body 1. The pipe connector 12 is used to connect to the hydrogen supply pipe 2 and the chlorine supply pipe 3, facilitating the use of the hydrogen supply pipe 2 and the chlorine supply pipe 3 in conjunction with the synthesis furnace body 1. A nitrogen supply pipe 4 is provided after the hydrogen supply pipe 2 along the synthesis furnace hydrogen flow cut-off valve 25. A synthesis furnace nitrogen charging valve 41 is connected to the nitrogen supply pipe 4. The nitrogen supply pipe 4 is used to input nitrogen into the synthesis furnace body 1, and the synthesis furnace nitrogen charging valve 41 is used to open the nitrogen supply pipe 4. A hydrogen chloride discharge pipe 5 is connected to a hydrogen chloride to VCM pipe 6 and a hydrogen chloride to absorption pipe 7 after the hydrogen chloride pressure transmitter 51, respectively, for transporting hydrogen chloride to the corresponding subsequent processes. A hydrogen chloride to VCM flow regulating valve 61 is installed on the hydrogen chloride to VCM pipe 6, which is used to regulate the flow rate of hydrogen chloride to VCM. A hydrogen chloride absorption flow regulating valve 62 is installed on the hydrogen chloride absorption tube 7. The hydrogen chloride absorption flow regulating valve 62 is used to control the flow rate of hydrogen chloride absorption.

[0025] Embodiment 2

[0026] As Figure 1 shown, a hydrogen chloride synthesis furnace safety interlock protection device, comprising a synthesis furnace body 1 for synthesizing hydrogen chloride; the bottom of the synthesis furnace body 1 is connected with a hydrogen gas conveying pipe 2 and a chlorine gas conveying pipe 3, the hydrogen gas conveying pipe 2 is used for conveying hydrogen gas into the synthesis furnace body 1, and the chlorine gas conveying pipe 3 is used for conveying chlorine gas into the synthesis furnace, so as to facilitate the reaction of hydrogen gas and chlorine gas to synthesize hydrogen chloride. The top of the side of the synthesis furnace body 1 is provided with a hydrogen chloride discharge pipe 5; the hydrogen chloride discharge pipe 5 is convenient for discharging the synthesized hydrogen chloride. The hydrogen gas conveying pipe 2 is sequentially provided with a hydrogen gas pressure transmitter 21, a first hydrogen gas orifice flowmeter 22, a second hydrogen gas orifice flowmeter 23, a synthesis furnace hydrogen gas flow regulating valve 24 and a synthesis furnace hydrogen gas flow cut-off valve 25 from the gas inlet to the synthesis furnace body 1; the hydrogen gas pressure transmitter 21 is used for measuring the hydrogen gas pressure in the hydrogen gas conveying pipe 2, the first hydrogen gas orifice flowmeter 22 and the second hydrogen gas orifice flowmeter 23 are convenient for accurately determining the flow of hydrogen gas, so as to facilitate the subsequent determination of the ratio of hydrogen gas and chlorine gas in the furnace. The synthesis furnace hydrogen gas flow regulating valve 24 is convenient for adjusting the flow of hydrogen gas in the hydrogen gas conveying pipe 2, and the synthesis furnace hydrogen gas flow cut-off valve 25 is used for closing the hydrogen gas conveying pipe 2. The chlorine gas conveying pipe 3 is sequentially provided with a chlorine gas pressure transmitter 31, a first chlorine gas orifice flowmeter 32, a second chlorine gas orifice flowmeter 33, a synthesis furnace chlorine gas flow regulating valve 34 and a synthesis furnace chlorine gas flow cut-off valve 35 from the gas inlet to the synthesis furnace body 1; the chlorine gas conveying pipe 3 is connected with a hydrogen chloride pressure transmitter 51, the chlorine gas pressure transmitter 31 is used for measuring the pressure in the chlorine gas conveying pipe 3, the first chlorine gas orifice flowmeter 32 and the second chlorine gas orifice flowmeter 33 are convenient for accurately measuring the flow of chlorine gas; the synthesis furnace chlorine gas flow regulating valve 34 is convenient for adjusting the flow of chlorine gas in the chlorine gas conveying pipe 3. The synthesis furnace chlorine gas flow cut-off valve 35 is used for closing the chlorine gas conveying pipe 3 to block the continuous conveying of chlorine gas.

[0027] As Figure 1As shown, the bottom of the synthesis furnace body 1 is provided with a pipe joint 12, which is used to connect with the hydrogen delivery pipe 2 and the chlorine delivery pipe 3, facilitating the cooperation of the hydrogen delivery pipe 2 and the chlorine delivery pipe 3 with the synthesis furnace body 1. The hydrogen delivery pipe 2 is provided with a nitrogen delivery pipe 4 behind the synthesis furnace hydrogen flow cut-off valve 25, and the nitrogen delivery pipe 4 is connected with a synthesis furnace nitrogen charging valve 41. The nitrogen delivery pipe 4 is used to input nitrogen into the synthesis furnace body 1, and the synthesis furnace nitrogen charging valve 41 is used to open the nitrogen delivery pipe 4. The hydrogen chloride discharge pipe 5 is connected with a hydrogen chloride VCM removal pipe 6 and a hydrogen chloride absorption removal pipe 7 respectively behind the hydrogen chloride pressure transmitter 51, and is used to deliver the hydrogen chloride to the corresponding subsequent processes respectively. The hydrogen chloride VCM removal pipe 6 is provided with a hydrogen chloride VCM removal flow regulating valve 61, which is used to regulate the flow of the hydrogen chloride VCM removal. The hydrogen chloride absorption removal pipe 7 is provided with a hydrogen chloride absorption removal flow regulating valve 62, which is used to control the flow of the hydrogen chloride absorption removal.

[0028] As shown in Figure 1 , the top end of the synthesis furnace body 1 is provided with a synthesis furnace explosion-proof membrane 11, which is detachably connected with the synthesis furnace body 1. This structure facilitates the triggering of the rupture when the internal pressure of the synthesis furnace is too large, quickly releases the overpressure gas in the furnace, and prevents explosion accidents. At the same time, it is also convenient to replace the explosion-proof membrane after the synthesis furnace explosion-proof membrane 11 is triggered.

[0029] As shown in Figure 2 , the specific working principle is as follows:

[0030] 1. In the case of emergency, the synthesis furnace safety interlocking logic is as follows:

[0031] 1.1. When the synthesis furnace hydrogen and chlorine ratio is less than 1.05, and the hydrogen pressure rising speed exceeds 0.1 KPa / S, both exist at the same time and last for 5 seconds, the corresponding synthesis furnace interlocking shutdown.

[0032] 1.2. When the ratio is less than 1.05, and the chlorine pressure rising speed exceeds 0.1 KPa / S, both exist at the same time and last for 5 seconds, the corresponding synthesis furnace interlocking shutdown.

[0033] 1.3. When the ratio is less than 1.05, and the chlorine pressure descending speed exceeds 0.1 KPa / S, both exist at the same time and last for 5 seconds, the corresponding synthesis furnace interlocking shutdown.

[0034] 1.4. The chlorine and hydrogen pressures entering the hydrogen chloride synthesis furnace are used as the interlocking protection judgment condition. Once the hydrogen pressure is too low or the chlorine pressure is too high, the hydrogen chloride synthesis furnace is interlocked to stop, preventing the synthesis furnace from being over-chlorinated.

[0035] Meanwhile, corresponding interlocking switching is arranged on each synthetic furnace, when the synthetic furnace is ignited, the load is raised, the water hydrogen is prepared or the hydrogen is recovered, etc., the interlocking switching should be cut off first, and then the interlocking is put into operation after the stable operation of the synthetic furnace, so that the safe and stable operation of the hydrogen chloride synthetic furnace in various states is effectively ensured.

[0036] 2. When the hydrogen chloride synthetic furnace is stopped, the interlocking protection program of the hydrogen chloride synthetic furnace executes the following actions in turn:

[0037] 2.1 Close the synthetic furnace chlorine flow regulating valve 34;

[0038] 2.2 Close the synthetic furnace chlorine flow cut-off valve 35;

[0039] 2.3 Close the synthetic furnace hydrogen flow regulating valve 24 at a speed of 10% / S, when the opening is less than 20%, it is directly closed;

[0040] 2.4 Close the synthetic furnace hydrogen flow cut-off valve 25;

[0041] 2.5 Close the hydrogen chloride to VCM flow regulating valve 61 at a speed of 10% / S, the hydrogen chloride to absorption flow regulating valve 62 is put into series, and the set value is 45KPa;

[0042] 2.6 Open the synthetic furnace nitrogen filling valve 41.

[0043] The above is only the preferred embodiment of the present application, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A safety interlock protection device for a hydrogen chloride synthesis furnace, comprising a synthesis furnace body (1), characterized in that, The synthesis furnace body (1) is connected with a hydrogen delivery pipe (2) and a chlorine delivery pipe (3) at the bottom, and is provided with a hydrogen chloride discharge pipe (5) at the top of the side; the hydrogen delivery pipe (2) is sequentially provided with a hydrogen pressure transmitter (21), a first hydrogen orifice flowmeter (22), a second hydrogen orifice flowmeter (23), a synthesis furnace hydrogen flow regulating valve (24) and a synthesis furnace hydrogen flow cut-off valve (25) from the gas inlet to the synthesis furnace body (1); the chlorine delivery pipe (3) is sequentially provided with a chlorine pressure transmitter (31), a first chlorine orifice flowmeter (32), a second chlorine orifice flowmeter (33), a synthesis furnace chlorine flow regulating valve (34) and a synthesis furnace chlorine flow cut-off valve (35) from the gas inlet to the synthesis furnace body (1); the hydrogen chloride discharge pipe is connected with a hydrogen chloride pressure transmitter (51).

2. The safety interlock protection device for hydrogen chloride synthesis furnace according to claim 1, characterized in that, The synthesis furnace body (1) is provided with a pipe joint (12) at the bottom, which is used to connect with the hydrogen delivery pipe (2) and the chlorine delivery pipe (3).

3. The safety interlock protection device for hydrogen chloride synthesis furnace according to claim 1, characterized in that, The hydrogen delivery pipe (2) is provided with a nitrogen delivery pipe (4) behind the synthesis furnace hydrogen flow cut-off valve (25), and the nitrogen delivery pipe (4) is connected with a synthesis furnace nitrogen filling valve (41).

4. The safety interlock protection device for hydrogen chloride synthesis furnace according to claim 3, characterized in that, The hydrogen chloride discharge pipe (5) is connected with a hydrogen chloride VCM removal pipe (6) and a hydrogen chloride absorption removal pipe (7) behind the hydrogen chloride pressure transmitter (51) respectively, for delivering hydrogen chloride to the corresponding subsequent processes respectively.

5. The safety interlock protection device for hydrogen chloride synthesis furnace according to claim 4, characterized in that, The hydrogen chloride VCM removal pipe (6) is provided with a hydrogen chloride VCM removal flow regulating valve (61), which is used to regulate the flow of hydrogen chloride VCM removal.

6. The safety interlock protection device for hydrogen chloride synthesis furnace according to claim 5, characterized in that, The hydrogen chloride absorption removal pipe (7) is provided with a hydrogen chloride absorption removal flow regulating valve (62), which is used to control the flow of hydrogen chloride absorption removal.

7. The safety interlock protection device for hydrogen chloride synthesis furnace according to any one of claims 1-6, characterized in that, The synthesis furnace body (1) is provided with a synthesis furnace explosion-proof membrane (11) at the top end, which is detachably connected with the synthesis furnace body (1).

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