Reactor interlocking protection system and reaction system containing sulfite reactor

Abstract

The utility model provides a reactor interlocking protection system and a reaction system containing a sulfite reactor. Comprising a nitric acid feeding switch valve arranged on a nitric acid feeding pipeline of the thylene reactor, a reactor first temperature transmitter connected with the thylene reactor and arranged in a liquid phase space of the thylene reactor, and a reactor pressure transmitter connected with the thylene reactor and arranged in a gas phase space of the thylene reactor, the stirrer current sensor is connected with a stirrer in the sulfite reactor; and the reactor first temperature transmitter, the reactor pressure transmitter and the stirrer current sensor are interlocked with the nitric acid feeding pipeline switch valve. According to the interlocking protection system for the reactor, the operation risk caused by the flammable and combustible property of raw materials can be effectively reduced, and the safety and operability of the reactor are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical safety technology, and particularly relates to a reactor interlock protection system and a reaction system with an esterate reactor. BACKGROUND

[0002] Ethylene glycol is an important chemical raw material and strategic material, and is mainly used for manufacturing polyester, explosives, glyoxal and the like, and is long-term in short supply in domestic and foreign markets. At present, the main production methods of ethylene glycol include a petroleum route, a semi-petroleum route and a non-petroleum route. However, China is short of petroleum and natural gas resources, and is relatively rich in coal resources. Developing a coal chemical industry is conducive to promoting the implementation of a petroleum substitution strategy and meeting the needs of economic and social development. Meanwhile, in the face of the reality of increasingly scarce world petroleum resources, rising oil prices and insufficient supply of ethylene and ethylene glycol, a two-step technical route (the oxalate method of the non-petroleum route) of producing ethylene glycol from natural gas or coal instead of petroleum, in particular, synthesizing oxalate by gas-phase reaction of synthesis gas, and then hydrogenating the oxalate to produce ethylene glycol, is a recognized process route with the most practical application value, and has good economic efficiency and competitiveness. In the process of producing ethylene glycol by the oxalate method, methyl nitrite is an important raw material for producing oxalate, but methyl nitrite is a flammable and explosive substance. Therefore, temperature control and safety protection of the esterate reactor are of the utmost importance for the safety and process of the entire ethylene glycol process.

[0003] Therefore, it is urgent for those skilled in the art to develop a reactor interlock protection system that can be applied to the esterate reactor to ensure the safety of the esterate reactor. INVENTION CONTENTS

[0004] The utility model discloses a reactor interlock protection system and a reaction system with an esterate reactor, which solve the problems in the prior art and ensure the safety and stability of the reaction. The reactor interlock protection system specifically includes: a first safety interlock shutdown of the esterate reactor, a second interlock nitrogen charging of the esterate reactor and a third reset operation scheme after the esterate reactor is shut down.

[0005] One of the purposes of the utility model is to provide a reactor interlock protection system, which comprises:

[0006] A nitric acid feeding on-off valve is arranged on a nitric acid feeding pipeline of the esterate reactor.

[0007] A reactor first temperature transmitter is connected with the esterate reactor and arranged in a liquid phase space of the esterate reactor.

[0008] A reactor pressure transmitter is connected with the esterate reactor and arranged in a gas phase space of the esterate reactor.

[0009] an agitator current sensor connected with an agitator in the esterification reactor;

[0010] The reactor first temperature transmitter, the reactor pressure transmitter and the agitator current sensor are all interlocked with the nitric acid feed switch valve.

[0011] In a preferred embodiment of the present application,

[0012] The nitric acid feed switch valve comprises a nitric acid feed pipeline switch valve arranged on the nitric acid feed pipeline and a nitric acid feed pipeline electromagnetic valve arranged on the gas path of the nitric acid feed pipeline switch valve.

[0013] The reactor first temperature transmitter, the reactor pressure transmitter and the agitator current sensor are all interlocked with the nitric acid feed pipeline electromagnetic valve.

[0014] In a preferred embodiment of the present application,

[0015] The reactor interlock protection system further comprises a reactor second temperature transmitter connected with the esterification reactor and arranged in the liquid phase space of the esterification reactor; the reactor second temperature transmitter is interlocked with the nitric acid feed pipeline switch valve; the second temperature transmitter is at a different vertical height from the first temperature transmitter.

[0016] Preferably,

[0017] The vertical distance between the reactor first temperature transmitter and the bottom surface of the esterification reactor is 1 / 14-1 / 5, more preferably 1 / 8-1 / 6, of the height of the esterification reactor; and / or,

[0018] The vertical distance between the reactor second temperature transmitter and the bottom surface of the esterification reactor is 1 / 5-1 / 2.5, more preferably 1 / 4-1 / 3, of the height of the esterification reactor.

[0019] In a preferred embodiment of the present application,

[0020] The reactor interlock protection system further comprises a carbon monoxide feed flowmeter and a nitrogen feed switch valve which are interlocked; the carbon monoxide feed flowmeter is arranged on the carbon monoxide feed pipeline of the esterification reactor; and the nitrogen feed switch valve is arranged on the nitrogen feed pipeline of the esterification reactor.

[0021] In a preferred embodiment of the present application,

[0022] The nitrogen feed switch valve comprises a nitrogen feed pipeline switch valve arranged on the nitrogen feed pipeline and a nitrogen feed pipeline electromagnetic valve arranged on the gas circuit of the nitrogen feed pipeline switch valve.

[0023] The carbon monoxide feed flow meter is interlocked with the nitrogen feed pipeline electromagnetic valve.

[0024] In a preferred embodiment of the utility model,

[0025] The reactor interlock protection system further comprises a safety instrument system and a control system; the control system is in communication connection with the safety instrument system, and the safety instrument system is in communication connection with the nitric acid feed switch valve;

[0026] Preferably,

[0027] The safety instrument system is in communication connection with the nitrogen feed switch valve.

[0028] More preferably,

[0029] The safety instrument system is in communication connection with the nitric acid feed pipeline electromagnetic valve and the nitrogen feed pipeline electromagnetic valve.

[0030] In a preferred embodiment of the utility model,

[0031] The nitric acid feed pipeline is further provided with a nitric acid feed flow transmitter, and the nitric acid feed flow transmitter is in communication connection with the control system.

[0032] In a preferred embodiment of the utility model,

[0033] The control system is further provided with a nitric acid feed reset module, which is in communication connection with a first temperature transmitter, a reactor pressure transmitter, a stirrer current sensor and a reactor gas phase outlet valve.

[0034] The second purpose of the utility model is to provide a reactor interlock protection system comprising an ester reactor, a stirrer arranged in the ester reactor, a nitric acid feed pipeline connected with the ester reactor, a gas feed pipeline connected with the ester reactor and the reactor interlock protection system of the first purpose of the utility model; the other end of the gas feed pipeline is connected with a carbon monoxide feed pipeline and a nitrogen feed pipeline respectively.

[0035] Preferably,

[0036] The ester reactor is connected with a reactor gas phase outlet pipeline, and a reactor gas phase outlet valve is arranged on the reactor gas phase outlet pipeline.

[0037] More preferably, a local pressure gauge and a local thermometer are arranged on the ester reactor.

[0038] In a more preferred embodiment of the utility model, it further comprises an oxidative esterification reactor connected with the esterification reactor, a coupling reactor connected with the oxidative esterification reactor and a circulating gas compressor;The nitric acid feed pipeline solenoid valve is connected with the oxidative esterification reactor temperature transmitter, the circulating methanol flow meter connected with the oxidative esterification reactor, the coupling reactor temperature transmitter, the circulating gas flow meter connected with the coupling reactor, the circulating gas compressor temperature transmitter, the circulating gas compressor inlet pressure transmitter interlock.

[0039] Compared with the prior art, the utility model has the beneficial effects that:

[0040] 1. The reactor interlock protection system of the utility model can effectively reduce the operation risk caused by flammable and explosive raw materials, and increase the safety and operability of the reactor itself and the reaction system containing methyl nitrite.

[0041] 2. The reactor interlock protection system of the utility model improves the automation level and production efficiency of the system, and reduces manual misoperation as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0042] Fig. 1 It is a process block flow chart comprising the reactor interlock protection system of the utility model;

[0043] Fig. 2 It is a schematic diagram of the reactor interlock protection system and the esterification reactor of the utility model;

[0044] Fig. 3 It is an interlock logic diagram of the reactor interlock protection system of the utility model;

[0045] In the drawing, TT-101: reactor first temperature transmitter;TT-102: reactor second temperature transmitter;PT-102: reactor pressure transmitter;XZV-101: nitric acid feed pipeline on-off valve;XZSOV-101: nitric acid feed pipeline solenoid valve;FT-104: carbon monoxide feed flow meter;XZV-102: nitrogen feed pipeline on-off valve;XZSOV-102: nitrogen feed pipeline solenoid valve;FIC-101: nitric acid feed flow transmitter;FV-101: nitric acid feed pneumatic control valve;FT-101: nitric acid feed flow meter. DETAILED DESCRIPTION

[0046] The utility model will be further described in detail in combination with the drawings:

[0047] As Figs. 1-3As shown, the utility model provides a reactor interlock protection system, below will take ester reactor as an example, the reactor interlock protection system is exemplified. The person skilled in the art knows that ester reactor is connected with nitric acid feed pipeline, gas feed pipeline, one end of gas feed pipeline is connected with carbon monoxide feed pipeline and nitrogen feed pipeline respectively, ester reactor is equipped with stirrer, the top of ester reactor is connected with reactor gas phase export pipeline, and reactor gas phase export pipeline is equipped with reactor gas phase export valve. Preferably, ester reactor is also connected with methanol feed pipeline and sodium nitrite solution feed pipeline.

[0048] The reactor interlock protection system comprises a nitric acid feed switch valve, a reactor first temperature transmitter TT-101, a reactor pressure transmitter PT-102 and a stirrer current sensor. The nitric acid feed switch valve can be an electric switch valve or a pneumatic switch valve, and is preferably a pneumatic switch valve. The nitric acid feed switch valve is arranged on the nitric acid feed pipeline and is used to control whether the nitric acid in the nitric acid feed pipeline enters the ester reactor. Preferably, the nitric acid feed pipeline switch valve comprises a nitric acid feed pipeline switch valve XZV-101 arranged on the nitric acid feed pipeline and a nitric acid feed pipeline electromagnetic valve XZSOV-101 arranged on the gas path of the nitric acid feed pipeline switch valve XZV-101. The reactor first temperature transmitter TT-101 is arranged in the liquid phase space of the ester reactor and is used to monitor the temperature in the ester reactor (methyl nitrite will decompose when encountering high temperature, and a large amount of heat will be released during the decomposition process, which is easy to cause explosion). The reactor pressure transmitter PT-102 is arranged in the gas phase space of the ester reactor, and is preferably arranged at the top of the ester reactor, and is used to monitor the pressure in the ester reactor (abnormal increase of the pressure in the ester reactor will occur before explosion). The stirrer current sensor is connected with the stirrer in the ester reactor and can be arranged on the electrical MCC frequency conversion cabinet stirrer or motor, and is used to monitor the current of the stirrer in the ester reactor (inhomogeneous mixing of the reaction raw materials will cause local reaction to be intense, which is easy to cause explosion). The reactor first temperature transmitter TT-101, the reactor pressure transmitter PT-102 and the stirrer current sensor are all interlocked with the nitric acid feed switch valve. It should be noted that the valve characteristic of the nitric acid feed pipeline switch valve XZV-101 is gas loss. In the utility model, the nitric acid feed pipeline switch valve XZV-101 is a pneumatic switch valve, which is only used for exemplified description and does not constitute a limitation on the utility model.

[0049] In a preferred embodiment of the utility model, reactor first temperature transmitter TT-101 and nitric acid feed pipeline solenoid valve XZSOV-101 are interlocked, when the temperature monitored by reactor first temperature transmitter TT-101 exceeds the preset temperature threshold, trigger nitric acid feed pipeline solenoid valve XZSOV-101 to act, that is, trigger nitric acid feed pipeline solenoid valve XZSOV-101 to close. Since nitric acid feed pipeline solenoid valve XZSOV-101 is arranged on the gas circuit of nitric acid feed pipeline switch valve XZV-101, the gas circuit of nitric acid feed pipeline switch valve XZV-101 is cut off to make nitric acid feed pipeline switch valve XZV-101 close, and the nitric acid in the nitric acid feed pipeline cannot enter the esterification reactor again, that is, the feed nitric acid of the esterification reactor is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the reaction temperature in it gradually returns to normal. It should be noted that even after the temperature returns to normal, nitric acid feed pipeline solenoid valve XZSOV-101 and nitric acid feed pipeline switch valve XZV-101 will not automatically open.

[0050] In a preferred embodiment of the utility model, reactor pressure transmitter PT-102 and nitric acid feed pipeline solenoid valve XZSOV-101 are interlocked, when the pressure monitored by reactor pressure transmitter PT-102 exceeds the preset pressure threshold, trigger nitric acid feed pipeline solenoid valve XZSOV-101 to act, that is, trigger nitric acid feed pipeline solenoid valve XZSOV-101 to close. Since nitric acid feed pipeline solenoid valve XZSOV-101 is arranged on the gas circuit of nitric acid feed pipeline switch valve XZV-101, the gas circuit of nitric acid feed pipeline switch valve XZV-101 is cut off to make nitric acid feed pipeline switch valve XZV-101 close, and the nitric acid in the nitric acid feed pipeline cannot enter the esterification reactor again, that is, the feed nitric acid of the esterification reactor is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the reaction pressure in it gradually returns to normal. It should be noted that even after the pressure returns to normal, nitric acid feed pipeline solenoid valve XZSOV-101 and nitric acid feed pipeline switch valve XZV-101 will not automatically open.

[0051] In a preferred embodiment of the utility model, the stirrer current sensor is interlocked with the nitric acid feeding pipeline electromagnetic valve XZSOV-101, when the stirrer current monitored by the stirrer current sensor is less than the preset stirrer current threshold, the nitric acid feeding pipeline electromagnetic valve XZSOV-101 is triggered to act, that is, the nitric acid feeding pipeline electromagnetic valve XZSOV-101 is triggered to close. Since the nitric acid feeding pipeline electromagnetic valve XZSOV-101 is arranged on the gas path of the nitric acid feeding pipeline switch valve XZV-101, the gas path of the nitric acid feeding pipeline switch valve XZV-101 is cut off to make the nitric acid feeding pipeline switch valve XZV-101 close, and the nitric acid in the nitric acid feeding pipeline cannot enter the esterification reactor any more, that is, the feeding of the esterification reactor is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the stirrer current gradually returns to normal. It should be noted that even if the stirrer current returns to normal, the nitric acid feeding pipeline electromagnetic valve XZSOV-101 and the nitric acid feeding pipeline switch valve XZV-101 will not automatically open.

[0052] In a preferred embodiment of the utility model, the reactor interlock protection system further comprises a plurality of temperature transmitters connected with the esterification reactor and arranged in the liquid phase space of the esterification reactor; preferably, the reactor interlock protection system further comprises a reactor second temperature transmitter TT-102 connected with the esterification reactor and arranged in the liquid phase space of the esterification reactor. The reactor second temperature transmitter TT-102 is interlocked with the nitric acid feeding switch valve to increase the reliability of the over-temperature interlock and further ensure the safety of the esterification reactor; wherein the second temperature transmitter TT-102 and the first temperature transmitter TT-101 are at different vertical heights. The local reaction in the liquid phase of the esterification reactor is intense, causing local high temperature of the liquid phase in the esterification reactor, and the reactor second temperature transmitter TT-102 is arranged to increase the interlock reliability.

[0053] In a more preferred embodiment of the utility model, the vertical distance between the reactor first temperature transmitter TT-101 and the bottom surface of the esterification reactor is 1 / 14~1 / 5 of the height of the esterification reactor, preferably 1 / 8~1 / 6; the length of the thermometer of the reactor first temperature transmitter TT-101 inserted into the inner wall of the equipment should be more than 150mm and not more than 400mm. The vertical distance between the reactor second temperature transmitter TT-102 and the bottom surface of the esterification reactor is 1 / 5~1 / 2.5 of the height of the esterification reactor, preferably 1 / 4~1 / 3; the length of the thermometer of the reactor second temperature transmitter TT-102 inserted into the inner wall of the equipment should be more than 150mm and not more than 400mm.

[0054] In the preferred embodiment of the utility model, the reactor second temperature transmitter TT-102 is interlocked with the nitric acid feed pipeline electromagnetic valve XZSOV-101, when the temperature monitored by the reactor second temperature transmitter TT-102 exceeds the preset temperature threshold, the nitric acid feed pipeline electromagnetic valve XZSOV-101 is triggered to act, that is, the nitric acid feed pipeline electromagnetic valve XZSOV-101 is triggered to close. Since the nitric acid feed pipeline electromagnetic valve XZSOV-101 is arranged on the gas circuit of the nitric acid feed pipeline switch valve XZV-101, the gas circuit of the nitric acid feed pipeline switch valve XZV-101 is cut off to make the nitric acid feed pipeline switch valve XZV-101 close, and the nitric acid in the nitric acid feed pipeline cannot enter the esterification reactor, that is, the feeding of nitric acid to the esterification reactor is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the reaction temperature gradually returns to normal. It should be noted that, first, when the temperature monitored by any one of the reactor first temperature transmitter TT-101 and the reactor second temperature transmitter TT-102 exceeds the preset temperature threshold, the nitric acid feed pipeline electromagnetic valve XZSOV-101 is triggered to close and the nitric acid feed pipeline switch valve XZV-101 is triggered to close, and the feeding of nitric acid to the esterification reactor is cut off; second, even after the temperature returns to normal, the nitric acid feed pipeline electromagnetic valve XZSOV-101 and the nitric acid feed pipeline switch valve XZV-101 will not automatically open.

[0055] The reactor interlocking protection system also comprises a nitric acid stop module, which is in communication connection with the nitric acid feed pipeline electromagnetic valve XZSOV-101. The nitric acid stop module is provided with a "nitric acid stop" manual button, and when receiving the manual "nitric acid stop" instruction, the nitric acid feed pipeline electromagnetic valve XZSOV-101 is triggered to act. Since the nitric acid feed pipeline electromagnetic valve XZSOV-101 is arranged on the gas circuit of the nitric acid feed pipeline switch valve XZV-101, the gas circuit of the nitric acid feed pipeline switch valve XZV-101 is cut off to make the nitric acid feed pipeline switch valve XZV-101 close, and the nitric acid in the nitric acid feed pipeline cannot enter the esterification reactor, that is, the feeding of nitric acid to the esterification reactor is cut off. Subsequently, the reaction in the esterification reactor gradually stops.

[0056] In an optimal embodiment of the utility model, the reactor interlock protection system further comprises a carbon monoxide feed flowmeter FT-104 and a nitrogen feed on-off valve in interlock. The carbon monoxide feed flowmeter FT-104 is arranged on a carbon monoxide feed pipeline and is used to monitor the carbon monoxide flow in the carbon monoxide feed pipeline; the nitrogen feed on-off valve is arranged on a nitrogen feed pipeline and is used to control whether the nitrogen in the nitrogen feed pipeline enters the esterification reactor; preferably, the nitrogen feed on-off valve comprises a nitrogen feed pipeline on-off valve XZV-102 and a nitrogen feed pipeline solenoid valve XZSOV-102, the nitrogen feed pipeline on-off valve is arranged on the nitrogen feed pipeline, the nitrogen feed pipeline solenoid valve XZSOV-102 is arranged on the gas circuit of the nitrogen feed pipeline on-off valve XZV-102, and both are used to control whether the nitrogen in the nitrogen feed pipeline enters the esterification reactor. It should be noted that the valve characteristic of the nitrogen feed pipeline on-off valve XZV-102 is gas loss.

[0057] In an optimal embodiment of the utility model, the carbon monoxide feed flowmeter FT-104 is interlocked with the nitrogen feed pipeline solenoid valve XZSOV-102, when the flow monitored by the carbon monoxide feed flowmeter FT-104 is less than the preset carbon monoxide flow threshold, the nitrogen feed pipeline solenoid valve XZSOV-102 is triggered to act, i.e. the nitrogen feed pipeline solenoid valve XZSOV-102 is triggered to close. Since the nitrogen feed pipeline solenoid valve XZSOV-102 is arranged on the gas circuit of the nitrogen feed pipeline on-off valve XZV-102, the gas circuit of the nitrogen feed pipeline on-off valve XZV-102 is cut off to open the nitrogen feed pipeline on-off valve XZV-102, the nitrogen in the nitrogen feed pipeline enters the esterification reactor, the purpose of filling nitrogen into the esterification reactor is achieved, the gas in the esterification reactor is diluted, and the safety of the esterification reactor is ensured. At the same time, the carbon monoxide feed flowmeter FT-104 is interlocked with the nitric acid feed pipeline solenoid valve XZSOV-101, when the flow monitored by the carbon monoxide feed flowmeter FT-104 is less than the preset carbon monoxide flow threshold, the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to act, i.e. the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close and the nitric acid feed pipeline on-off valve XZV-101 is triggered to close, the nitric acid in the nitric acid feed pipeline cannot enter the esterification reactor any more, i.e. the nitric acid feed of the esterification reactor is cut off.

[0058] The reactor interlock protection system of the utility model, the carbon monoxide feed flowmeter FT-104 is equipped with carbon monoxide flow interlock bypass.The reactor interlock protection system of the utility model further includes nitrogen charging reset module, and the nitrogen charging reset module is equipped with " nitrogen charging reset " manual button.When the flow monitored by the carbon monoxide feed flowmeter FT-104 is less than preset carbon monoxide flow threshold value, the esterification reactor enters interlock shutdown state (nitric acid feed is cut off).Nitrogen can dilute the gas in the esterification reactor, and after manual sampling confirms that the ester concentration in the gas phase medium in the esterification reactor is safe, the reactor will enter standby operation state.At this time, the interlock between " carbon monoxide feed flowmeter FT-104 and nitrogen feed pipeline solenoid valve XZSOV-102 " needs to be reset and the nitrogen feed pipeline switch valve XZV-102 is closed.Because all the valves on the feed pipeline are in closed standby operation state, the flow monitored by the carbon monoxide feed flowmeter FT-104 is 0.However, nitrogen blowing into the reactor does not need to continue at this time, so even if the " charging reset " instruction is received, the interlock between " carbon monoxide feed flowmeter FT-104 and nitrogen feed pipeline solenoid valve XZSOV-102 " still cannot be reset.At this time, the carbon monoxide flow interlock bypass is connected, the signal that " the flow monitored by the carbon monoxide feed flowmeter FT-104 is less than preset carbon monoxide flow threshold value " is shielded, and when the manual " nitrogen charging reset " instruction is received, the interlock between " carbon monoxide feed flowmeter FT-104 and nitrogen feed pipeline solenoid valve XZSOV-102 " can be reset and the nitrogen feed pipeline solenoid valve XZSOV-102 is closed.It needs to be explained that before the esterification reactor starts, the carbon monoxide flow interlock bypass needs to be removed to avoid the interlock between " carbon monoxide feed flowmeter FT-104 and nitrogen feed pipeline solenoid valve XZSOV-102 " being invalid after the esterification reactor starts.

[0059] In a preferred embodiment of the utility model, the first temperature transmitter TT-101 is equipped with first temperature interlock bypass, the pressure transmitter PT-102 is equipped with pressure interlock bypass, the agitator current sensor is equipped with agitator current interlock bypass, and the second temperature transmitter TT-102 is equipped with second temperature interlock temperature.The functions of the four interlock bypasses are respectively shielding the signal that " when the temperature monitored by the reactor first temperature transmitter TT-101 exceeds preset temperature threshold value ", shielding the signal that " when the pressure monitored by the reactor pressure transmitter PT-102 exceeds preset pressure threshold value ", shielding the signal that " when the agitator current monitored by the agitator current sensor is less than preset agitator current threshold value ", and shielding the signal that " when the temperature monitored by the reactor second temperature transmitter TT-102 exceeds preset temperature threshold value ", so that the nitric acid feed pipeline solenoid valve XZSOV-101 cannot be closed, and further flexibility is provided for manual operation, which is convenient for online maintenance and replacement.

[0060] The reactor interlock protection system of the utility model further includes a nitrogen charging module, which is in communication connection with the nitrogen inlet pipeline electromagnetic valve XZSOV-102. The nitrogen charging module is further provided with a "nitrogen charging" manual button. When receiving the "nitrogen charging" instruction from the operator, the nitrogen inlet pipeline electromagnetic valve XZSOV-102 is triggered to act. Since the nitrogen inlet pipeline electromagnetic valve XZSOV-102 is arranged on the gas path of the nitrogen inlet pipeline switch valve XZV-102, the gas path of the nitrogen inlet pipeline switch valve XZV-102 is cut off, so that the nitrogen inlet pipeline switch valve XZV-102 is opened, and the nitrogen in the nitrogen inlet pipeline enters the esterate reactor, thereby achieving the purpose of charging nitrogen into the esterate reactor and diluting the gas in the esterate reactor.

[0061] In a preferred embodiment of the utility model, the reactor interlock protection system further includes a safety instrument system and a control system in communication connection, wherein the control system is provided with an alarm device. When the interlock is triggered (when the temperature monitored by the reactor first temperature transmitter TT-101 exceeds the preset temperature threshold value, or when the pressure monitored by the reactor pressure transmitter PT-102 exceeds the preset pressure threshold value, or when the agitator current monitored by the agitator current sensor is less than the preset agitator current threshold value, or when the temperature monitored by the reactor second temperature transmitter TT-102 exceeds the preset temperature threshold value), the safety instrument system sends an action signal to the nitric acid inlet pipeline electromagnetic valve XZSOV-101 and sends a signal to the alarm device in the control system, the alarm device alarms and indicates, prompting the operator to make further processing. The safety instrument system is in communication connection with the nitrogen inlet pipeline electromagnetic valve XZSOV-102. When the interlock is triggered (when the flow monitored by the carbon monoxide inlet flow meter FT-104 is less than the preset carbon monoxide flow threshold value), the safety instrument system sends an action signal to the nitrogen inlet pipeline electromagnetic valve XZSOV-102 and sends a signal to the alarm device in the control system, the alarm device alarms and indicates, prompting the operator to make further processing.

[0062] In a preferred embodiment of the utility model, the safety instrument system is in communication connection with the reactor first temperature transmitter TT-101, the reactor second temperature transmitter TT-102, the reactor pressure transmitter PT-102, the agitator current sensor and the reactor gas phase outlet valve, so as to respectively receive the real-time temperature of the reactor first temperature transmitter TT-101, the real-time temperature of the reactor second temperature transmitter TT-102, the real-time pressure of the reactor pressure transmitter PT-102, the real-time current of the agitator current sensor and the valve position of the reactor gas phase outlet valve.

[0063] In the preferred embodiment of the utility model, the control system is further provided with a display device, the display device comprises a reactor first temperature transmitter display module, a reactor second temperature transmitter display module, a reactor pressure transmitter display module, a stirrer current display module, a reactor gas phase outlet valve valve position display module, a nitric acid feed pipeline on-off valve valve position display module, a nitrogen feed pipeline on-off valve valve position display module and a carbon monoxide flow display module, so as to facilitate the secondary confirmation of the operator on whether each valve is switched to the right position and whether each trigger condition is in the normal state. The reactor first temperature transmitter display module, the reactor second temperature transmitter display module, the reactor pressure transmitter display module, the stirrer current display module, the reactor gas phase outlet valve valve position display module, the nitric acid feed pipeline on-off valve valve position display module, the nitrogen feed pipeline on-off valve valve position display module and the carbon monoxide flow display module are used for displaying the real-time temperature of the reactor first temperature transmitter, the real-time temperature of the reactor second temperature transmitter, the real-time pressure of the reactor pressure transmitter, the real-time current of the stirrer, the valve position (full opening or full closing) of the reactor gas phase outlet valve, the valve position (full opening or full closing) of the nitric acid feed pipeline on-off valve, the valve position (full opening or full closing) of the nitrogen feed pipeline on-off valve and the real-time flow of carbon monoxide respectively. Preferably, the display device comprises the valve position display module of all on-off valves, which is basically the same as the setting of the "reactor gas phase outlet valve valve position display module", and will not be described here again. More preferably, the reactor gas phase outlet valve is provided with a gas phase outlet interlock bypass, and the function of the interlock bypass is to shield the signal that the "reactor gas phase outlet valve is not in the full opening valve position".

[0064] In the preferred embodiment of the utility model, the control system is further provided with a nitric acid feed reset module, which is in communication connection with the first temperature transmitter TT-101, the reactor pressure transmitter PT-102, the stirrer current sensor and the reactor gas phase outlet valve. The nitric acid feed reset module receives a reset instruction, the first temperature sent by the reactor first temperature transmitter TT-101, the second temperature sent by the reactor second temperature transmitter TT-102, the pressure sent by the reactor pressure transmitter PT-102, the stirrer current sent by the stirrer current sensor and the valve position of the reactor gas phase outlet valve sent by the safety instrument system, and judges whether to send an opening instruction to the nitric acid feed pipeline electromagnetic valve XZSOV-101 based on the first temperature, the second temperature, the pressure, the stirrer current and the valve position of the reactor gas phase outlet valve.

[0065] When the nitric acid feeding reset module receives the "nitric acid feeding reset" instruction sent by the operator, the nitric acid feeding reset module receives the first temperature sent by the reactor first temperature transmitter TT-101, the second temperature sent by the reactor second temperature transmitter TT-102, the pressure sent by the reactor pressure transmitter PT-102, the agitator current sent by the agitator current sensor, and the valve position of the reactor gas phase outlet valve sent by the safety instrument system; if the first temperature exceeds the preset temperature threshold, or the second temperature exceeds the preset temperature threshold, or the pressure exceeds the preset pressure threshold, or the agitator current is less than the preset current threshold, or the reactor gas phase outlet valve is in the full closed valve position, the nitric acid feeding reset module does not send the opening instruction to the nitric acid feeding pipeline electromagnetic valve XZSOV-101, the nitric acid feeding pipeline on-off valve XZV-101 is still closed, and the nitric acid in the nitric acid feeding pipeline cannot enter the esterification reactor again, that is, the esterification reactor cannot resume the nitric acid feeding.

[0066] When the nitric acid feeding reset module receives the "nitric acid feeding reset" instruction sent by the operator, the nitric acid feeding reset module receives the first temperature sent by the reactor first temperature transmitter TT-101, the second temperature sent by the reactor second temperature transmitter TT-102, the pressure sent by the reactor pressure transmitter PT-102, the agitator current sent by the agitator current sensor, and the valve position of the reactor gas phase outlet valve sent by the safety instrument system; if the first temperature exceeds the preset temperature threshold, or the second temperature exceeds the preset temperature threshold, or the pressure exceeds the preset pressure threshold, or the agitator current is less than the preset current threshold, or the reactor gas phase outlet valve is in the full closed valve position, the nitric acid feeding reset module does not send the opening instruction to the nitric acid feeding pipeline electromagnetic valve XZSOV-101, the nitric acid feeding pipeline on-off valve XZV-101 is still closed, and the nitric acid in the nitric acid feeding pipeline cannot enter the esterification reactor again, that is, the esterification reactor cannot resume the nitric acid feeding.

[0067] In a preferred embodiment of the present application, the nitric acid feeding pipeline is further provided with a nitric acid feeding pneumatic regulating valve FV-101, a nitric acid feeding flow meter FT-101, and a nitric acid feeding flow transmitter FIC-101 in communication connection with the control system and the safety instrument system; wherein the nitric acid feeding flow meter FT-101 is used for measuring the nitric acid feeding flow, the nitric acid feeding pneumatic regulating valve FV-101 is used for adjusting the amount of nitric acid feeding, the nitric acid feeding flow transmitter FIC-101 is used for receiving the real-time flow of the nitric acid feeding flow meter FT-101 and sending it to the safety instrument system, and is used for receiving the nitric acid feeding flow adjustment instruction of the control system and controlling the nitric acid feeding pneumatic regulating valve FV-101 to adjust the flow. When the real-time flow of the nitric acid feeding flow meter FT-101 deviates from the set value, the nitric acid feeding flow transmitter FIC-101 receives the control system instruction and automatically adjusts the nitric acid feeding pneumatic regulating valve FV-101.

[0068] When the control system receives the signal that the nitric acid feed pipeline switch valve XZV-101 is closed, the control system first sends a closing instruction to the nitric acid feed flow transmitter FIC-101, so that the nitric acid feed flow transmitter FIC-101 is in the closed position; at this time, the nitric acid feed flow transmitter FIC-101 no longer receives the instruction of the control system and thus cannot automatically control the flow of the nitric acid feed pneumatic control valve FV-101 to adjust the flow, nor receive the real-time flow of the nitric acid feed flowmeter FT-101 and send it to the safety instrument system. However, the nitric acid feed pneumatic control valve FV-101 can still receive manual flow adjustment instructions. That is, the nitric acid feed pneumatic control valve FV-101 is switched from the "automatic adjustment" state to the "manual adjustment" state. The setting of the nitric acid feed flow transmitter FIC-101 can avoid the situation that after the nitric acid feed pipeline switch valve XZV-101 is opened again, a large amount of reaction raw materials enter the esterification reactor, causing the reaction to be violent and the temperature to rise rapidly.

[0069] The aforementioned "when the control system receives the signal that the nitric acid feed pipeline switch valve XZV-101 is closed, the control system first sends a closing instruction to the nitric acid feed flow transmitter FIC-101, so that the nitric acid feed flow transmitter FIC-101 is in the closed position, and thus cannot automatically control the flow of the nitric acid feed pneumatic control valve FV-101 to adjust the flow". When the nitric acid feed reset module sends an opening instruction to the nitric acid feed pipeline solenoid valve XZSOV-101, the manual gradually opens the nitric acid feed pneumatic control valve FV-101 and the nitric acid feed flowmeter FT-101 on the nitric acid feed pipeline in the safety instrument system, and when the real-time flow of the nitric acid feed flowmeter FT-101 reaches the set value (the flow is stable), the nitric acid feed flow transmitter FIC-101 is opened manually, and the communication connection between the control system, the nitric acid feed flow transmitter FIC-101, the nitric acid feed pneumatic control valve FV-101 and the nitric acid feed flowmeter FT-101 is restored, that is, the nitric acid feed pneumatic control valve FV-101 is switched from the "manual adjustment" state to the "automatic adjustment" state.

[0070] The utility model also relates to a kind of reaction systems of esterification reactor, including esterification reactor, stirrer being arranged in the esterification reactor, with the nitric acid feed pipeline being connected with the esterification reactor, with the gas feed pipeline being connected with the esterification reactor;The other end of the gas feed pipeline is connected with carbon monoxide feed pipeline, nitrogen feed pipeline respectively. Preferably, the top of the esterification reactor is connected with reactor gas phase outlet pipeline, and reactor gas phase outlet valve is arranged on the reactor gas phase outlet pipeline. More preferably, esterification reactor is also connected with methanol feed pipeline, sodium nitrite solution feed pipeline. Preferably, the esterification reactor is equipped with local pressure gauge and local thermometer, when one of reactor first temperature transmitter TT-101, reactor first temperature transmitter TT-102, reactor pressure transmitter PT-102 is switched to interlock bypass, the pressure and temperature of esterification reactor can be monitored.

[0071] In a preferred embodiment of the utility model, the reaction system of esterification reactor further includes oxidation esterification reactor connected with the esterification reactor, coupling reactor connected with the oxidation esterification reactor and circulating gas compressor. The oxidation esterification reactor is connected with circulating methanol pipeline, and oxidation esterification reactor temperature transmitter is arranged on the oxidation esterification reactor, and circulating methanol flow meter is arranged on the circulating methanol pipeline. The nitric acid feed pipeline solenoid valve XZSOV-101 is interlocked with the oxidation esterification reactor temperature transmitter and the circulating methanol flow meter. When the temperature monitored by the oxidation esterification reactor temperature transmitter is higher than the preset temperature threshold value or when the flow monitored by the circulating methanol flow meter is lower than the preset flow threshold value, the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, and the nitric acid no longer enters the esterification reactor, and then enters the oxidation esterification reactor and the coupling reactor.

[0072] The coupling reactor is connected with circulating gas pipeline, and coupling reactor temperature transmitter is arranged on the coupling reactor, and circulating gas flow meter is arranged on the circulating gas pipeline. The nitric acid feed pipeline solenoid valve XZSOV-101 is interlocked with the coupling reactor temperature transmitter and the circulating gas flow meter. When the temperature monitored by the coupling reactor temperature transmitter is higher than the preset temperature threshold value or when the flow monitored by the circulating gas flow meter is lower than the preset flow threshold value, the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, and the nitric acid no longer enters the esterification reactor, and then enters the oxidation esterification reactor and the coupling reactor.

[0073] The circulating gas compressor is provided with a circulating gas compressor temperature transmitter and a circulating gas compressor inlet pressure transmitter. The nitric acid feed pipeline solenoid valve XZSOV-101 is interlocked with the circulating gas compressor temperature transmitter and the circulating gas compressor inlet pressure transmitter. When the temperature monitored by the circulating gas compressor temperature transmitter is higher than the preset temperature threshold, or when the inlet pressure monitored by the circulating gas compressor inlet pressure transmitter is lower than the preset inlet pressure threshold, the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, and the nitric acid no longer enters the esterification reactor, and then enters the oxidation esterification reactor and the coupling reactor.

[0074] Example 1

[0075] When the temperature monitored by the reactor first temperature transmitter TT-101 exceeds the preset temperature threshold (i.e. the esterification reactor over-temperature interlock is triggered during operation, triggering the esterification reactor shutdown logic), the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to act, i.e. the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, the nitric acid feed pipeline on-off valve XZV-101 is closed, and the nitric acid in the nitric acid feed pipeline can no longer enter the esterification reactor, i.e. the esterification reactor feed of nitric acid is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the reaction temperature in the esterification reactor gradually returns to normal. At this time, the esterification reactor over-temperature interlock is released.

[0076] When the nitric acid feed reset module receives the nitric acid feed reset instruction sent by the operator, the nitric acid feed reset module receives the first temperature sent by the reactor first temperature transmitter TT-101, the second temperature sent by the reactor second temperature transmitter TT-102, the pressure sent by the reactor pressure transmitter PT-102, the agitator current sent by the agitator current sensor, and the reactor gas phase outlet valve position sent by the safety instrument system. When the first temperature does not exceed the preset temperature threshold, the second temperature does not exceed the preset temperature threshold, the pressure does not exceed the preset pressure threshold, the agitator current is not less than the preset current threshold, and the reactor gas phase outlet valve is in the full open valve position, the nitric acid feed reset module sends an opening instruction to the nitric acid feed pipeline solenoid valve XZSOV-101, the nitric acid feed pipeline on-off valve XZV-101 is opened, and the nitric acid in the nitric acid feed pipeline enters the esterification reactor again, i.e. the esterification reactor resumes nitric acid feeding; otherwise, the nitric acid feed reset module does not send an opening instruction to the nitric acid feed pipeline solenoid valve XZSOV-101. This embodiment avoids the secondary shutdown caused by forgetting the confirmation step of the "reactor gas phase outlet valve" valve position when manually resetting the nitric acid feeding.

[0077] Comparative Example 1

[0078] When the temperature monitored by the reactor first temperature transmitter TT-101 exceeds the preset temperature threshold (i.e. the esterification reactor over-temperature interlock is issued during operation, triggering the esterification reactor shutdown logic), the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to act, i.e. the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, the nitric acid feed pipeline on-off valve XZV-101 is closed, and the nitric acid in the nitric acid feed pipeline can no longer enter the esterification reactor, i.e. the esterification reactor feed nitric acid is cut off. Subsequently, the reaction in the esterification reactor gradually stops, and the reaction temperature in the esterification reactor gradually returns to normal. At this time, the esterification reactor over-temperature interlock is released.

[0079] When the nitric acid feed reset module receives the nitric acid feed reset instruction sent by the operator, the nitric acid feed reset module receives the first temperature sent by the reactor first temperature transmitter TT-101, the second temperature sent by the reactor second temperature transmitter TT-102, the pressure sent by the reactor pressure transmitter PT-102, and the agitator current sent by the agitator current sensor; the first temperature does not exceed the preset temperature threshold, the second temperature does not exceed the preset temperature threshold, the pressure does not exceed the preset pressure threshold, and the agitator current is not less than the preset current threshold, the nitric acid feed reset module sends an opening instruction to the nitric acid feed pipeline solenoid valve XZSOV-101, the nitric acid feed pipeline on-off valve XZV-101 is opened, and the nitric acid in the nitric acid feed pipeline enters the esterification reactor again, i.e. the esterification reactor resumes nitric acid feeding. However, at this time, the reactor gas phase outlet valve is in the full closed valve position, and the reaction will cause overpressure in the esterification reactor after a short period of time, and again due to "the pressure monitored by the reactor pressure transmitter PT-102 exceeds the preset pressure threshold" (i.e. the esterification reactor overpressure interlock is issued during operation, triggering the esterification reactor shutdown logic), the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to act, i.e. the nitric acid feed pipeline solenoid valve XZSOV-101 is triggered to close, the nitric acid feed pipeline on-off valve XZV-101 is closed, and the nitric acid in the nitric acid feed pipeline can no longer enter the esterification reactor, i.e. the esterification reactor feed nitric acid is cut off.

[0080] In the description of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the description of the utility model, unless otherwise specified, the orientation or position relation indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0082] The technical scheme described above is only one implementation manner of the utility model, and for those skilled in the art, on the basis of the principle disclosed by the utility model, various types of improvements or deformations can be easily made, and are not limited to the technical scheme described in the above specific embodiments of the utility model, therefore, the foregoing description is only preferred, and does not have a limiting significance.

Claims

1. A reactor interlock protection system, characterized by, The system comprises: a nitric acid feed switch valve arranged on a nitric acid feed line of the esterification reactor; a reactor first temperature transmitter connected to the esterification reactor and arranged in a liquid phase space of the esterification reactor; a reactor pressure transmitter connected to the esterification reactor and arranged in a gas phase space of the esterification reactor; a stirrer current sensor connected to a stirrer in the esterification reactor; wherein the reactor first temperature transmitter, the reactor pressure transmitter and the stirrer current sensor are interlocked with the nitric acid feed switch valve.

2. The reactor interlock protection system according to claim 1, wherein: the nitric acid feed switch valve comprises a nitric acid feed line switch valve arranged on the nitric acid feed line and a nitric acid feed line solenoid valve arranged on a gas path of the nitric acid feed line switch valve; wherein the reactor first temperature transmitter, the reactor pressure transmitter and the stirrer current sensor are interlocked with the nitric acid feed line solenoid valve.

3. The reactor interlock protection system according to claim 1, wherein: the reactor interlock protection system further comprises a reactor second temperature transmitter connected to the esterification reactor and arranged in the liquid phase space of the esterification reactor; the reactor second temperature transmitter is interlocked with the nitric acid feed line switch valve; the second temperature transmitter is at a different vertical height from the first temperature transmitter; preferably, a vertical distance between the reactor first temperature transmitter and a bottom surface of the esterification reactor is 1 / 14 to 1 / 5, more preferably 1 / 8 to 1 / 6, of a height of the esterification reactor; and / or a vertical distance between the reactor second temperature transmitter and the bottom surface of the esterification reactor is 1 / 5 to 1 / 2.5, more preferably 1 / 4 to 1 / 3, of the height of the esterification reactor.

4. The reactor interlock protection system according to claim 1, wherein: the reactor interlock protection system further comprises a carbon monoxide feed flow meter and a nitrogen feed switch valve which are interlocked; the carbon monoxide feed flow meter is arranged on a carbon monoxide feed line of the esterification reactor; the nitrogen feed switch valve is arranged on a nitrogen feed line of the esterification reactor.

5. The reactor interlock protection system according to claim 4, wherein: the nitrogen feed switch valve comprises a nitrogen feed line switch valve arranged on the nitrogen feed line and a nitrogen feed line solenoid valve arranged on a gas path of the nitrogen feed line switch valve; wherein the carbon monoxide feed flow meter is interlocked with the nitrogen feed line solenoid valve.

6. The reactor interlock protection system according to claim 4, wherein: the reactor interlock protection system further comprises a safety instrument system and a control system; the control system is communicatively connected to the safety instrument system, and the safety instrument system is communicatively connected to the nitric acid feed switch valve; preferably, the safety instrument system is communicatively connected to the nitrogen feed switch valve; more preferably, The safety instrument system is in communication connection with the nitric acid feed pipeline solenoid valve, and the safety instrument system is in communication connection with the nitrogen feed pipeline solenoid valve.

7. The reactor interlock protection system according to claim 6, characterized in that, The nitric acid feed pipeline is further provided with a nitric acid feed flow transmitter, and the nitric acid feed flow transmitter is in communication connection with the control system.

8. The reactor interlock protection system according to claim 6, characterized in that, The control system is further provided with a nitric acid feed reset module, which is in communication connection with the first temperature transmitter, the reactor pressure transmitter, the stirrer current sensor and the reactor gas phase outlet valve.

9. A reaction system comprising an esterate reactor, characterized in that, The esterification reactor, the stirrer arranged in the esterification reactor, the nitric acid feed pipeline connected with the esterification reactor, and the gas feed pipeline connected with the esterification reactor; the other end of the gas feed pipeline is connected with a carbon monoxide feed pipeline and a nitrogen feed pipeline respectively; Preferably, The esterification reactor is connected with a reactor gas phase outlet pipeline, and the reactor gas phase outlet pipeline is provided with a reactor gas phase outlet valve; More preferably, the esterification reactor is provided with a local pressure gauge and a local thermometer.

10. The esterate-containing reactor's reaction system according to claim 9, characterized in that, Further comprising an oxidation esterification reactor connected with the esterification reactor, a coupling reactor connected with the oxidation esterification reactor and a circulating gas compressor, and the reactor interlock protection system according to any one of claims 1 to 8; wherein the nitric acid feed pipeline solenoid valve is interlocked with an oxidation esterification reactor temperature transmitter, a circulating methanol flow meter connected with the oxidation esterification reactor, a coupling reactor temperature transmitter, a circulating gas flow meter connected with the coupling reactor, a circulating gas compressor temperature transmitter and a circulating gas compressor inlet pressure transmitter.

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