Methanol synthesis control system with stable and controllable temperature

Abstract

The utility model discloses a methanol synthesis control system with stable and controllable temperature, which is characterized in that a synthesis gas outlet heat exchanger is connected with a feed gas inlet pipe and a feed gas outlet pipe, the feed gas outlet pipe is connected with a methanol reactor, and an inlet pipe of a synthesis gas preheater is connected with the side edge of the methanol reactor; an outlet pipe of the synthesis gas preheater is connected with the upper end of the methanol reactor, the synthesis gas outlet heat exchanger is further provided with a synthesis gas inlet pipe and a synthesis gas outlet pipe, the synthesis gas inlet pipe is connected with the bottom of the methanol reactor, and the synthesis gas outlet pipe is connected with the methanol condenser. A raw material gas bypass pipe is arranged between the raw material gas inlet pipe and the inlet pipe of the synthesis gas preheater, a raw material gas bypass regulating valve is fixedly arranged on the raw material gas bypass pipe, and an electric heating mode is adopted, so that unsafe factors of steam pipeline heating and conduction oil heating are avoided; the frequency modulation frequency of the preheater is reduced while waste heat of synthesis gas is fully utilized, automatic control is achieved, the temperature of the methanol reactor is effectively controlled, and the safety of a synthesis system is improved.

Description

Technical Field

[0001] The utility model relates to the field of industrial equipment, in particular to a methanol synthesis control system with stable and controllable temperature. Background Art

[0002] Methanol is an important organic substance that can be widely used in chemical, agricultural, construction, transportation and other fields. With the proposal of dual carbon goals and the development of CCUS technology, the technology of producing methanol from carbon dioxide hydrogenation has received much attention. On the one hand, it can promote the consumption of hydrogen energy, and on the other hand, it can realize the resource utilization of carbon dioxide.

[0003] At present, the technical economic efficiency of producing methanol by hydrogenation of carbon dioxide is relatively low. The main reason is that the reaction requires a large amount of continuous heat, high energy consumption, low single-pass conversion rate, and most of them are industrial devices that cannot stably control and utilize the heat during the reaction.

[0004] In summary, a temperature-stable and controllable methanol synthesis control system is needed to solve the shortcomings of the prior art. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a methanol synthesis control system with stable and controllable temperature, aiming to solve the above problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a temperature-stable and controllable methanol synthesis control system, comprising a synthesis gas outlet heat exchanger, a methanol reactor, a synthesis gas preheater and a methanol condenser, wherein the synthesis gas outlet heat exchanger is connected to a raw gas inlet pipe and a raw gas outlet pipe, the raw gas outlet pipe is connected to the methanol reactor, the inlet pipe of the synthesis gas preheater is connected to the side of the methanol reactor, the outlet pipe of the synthesis gas preheater is connected to the upper end of the methanol reactor, the synthesis gas outlet heat exchanger is also provided with a synthesis gas inlet pipe and a synthesis gas outlet pipe, the synthesis gas inlet pipe is connected to the bottom of the methanol reactor, and the synthesis gas outlet pipe is connected to the methanol condenser.

[0007] Optionally, the methanol reactor comprises a reaction shell, a catalytic reaction column is arranged in the reaction shell, support plates are arranged at both ends of the catalytic reaction column, and the catalytic reaction column is connected to the reaction shell through the support plates.

[0008] Optionally, a raw gas bypass pipe is provided between the raw gas inlet pipe and the inlet pipe of the synthesis gas preheater, and a raw gas bypass regulating valve is fixedly provided on the raw gas bypass pipe.

[0009] Optionally, a synthesis gas preheating temperature transmitter is provided on the synthesis gas preheater, and the synthesis gas preheating temperature transmitter is fixedly connected to the synthesis gas preheater.

[0010] Optionally, an inlet temperature transmitter is provided at the top of the methanol reactor, and the inlet temperature transmitter is fixedly connected to the methanol reactor.

[0011] Optionally, a catalyst temperature transmitter is arranged in the middle of the methanol reactor, and the catalyst temperature transmitter is fixedly connected to the methanol reactor.

[0012] Optionally, a bottom temperature transmitter and an outlet temperature transmitter are provided at the bottom of the methanol reactor, and both the bottom temperature transmitter and the outlet temperature transmitter are fixedly connected to the methanol reactor.

[0013] Beneficial effects of the utility model:

[0014] 1. In the utility model, electric heating is adopted to provide heat to the system by using the synthesis gas preheater, thus avoiding the unsafe factors of steam pipeline heating and heat transfer oil heating, while fully utilizing the waste heat of the synthesis gas, reducing the frequency modulation of the preheater, realizing automatic control, playing a role in effectively controlling the temperature of the methanol reactor and increasing the safety of the synthesis system;

[0015] 2. In the utility model, the waste heat recovery principle is used to fully utilize the large amount of heat generated by the reaction and the heat of the synthesis gas, thereby saving energy consumption and improving the condensation effect of the methanol condenser;

[0016] 3. In the utility model, the opening of the raw gas bypass valve is controlled by the automatic control system to adjust the temperature of the methanol reactor system so that the temperature tends to be stable to increase the safety of the system, while reducing the frequent adjustment of the power of the synthesis gas preheater, thereby increasing the service life of the synthesis gas preheater, which has certain use value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of a system structure.

[0018] In the figure: 1. Synthesis gas outlet heat exchanger; 2. Methanol reactor; 3. Synthesis gas preheater; 4. Methanol condenser; 5. Raw gas bypass pipe; 6. Raw gas bypass regulating valve; 11. Raw gas inlet pipe; 12. Raw gas outlet pipe; 21. Reaction shell; 22. Catalytic reaction column; 23. Support plate; 24. Synthesis gas outlet pipe; 25. Synthesis gas outlet pipe; 26. Inlet temperature transmitter; 27. Catalyst temperature transmitter; 28. Bottom temperature transmitter; 29. ​​Outlet temperature transmitter; 31. Synthesis gas preheater inlet pipe; 32. Synthesis gas preheater outlet pipe; 33. Synthesis gas preheating temperature transmitter. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] like Figure 1 As shown, a temperature-stable and controllable methanol synthesis control system includes a synthesis gas outlet heat exchanger 1, a methanol reactor 2, a synthesis gas preheater 3 and a methanol condenser 4, the synthesis gas outlet heat exchanger 1 is connected to a raw gas inlet pipe 11 and a raw gas outlet pipe 12, the raw gas outlet pipe 12 is connected to the methanol reactor 2, the inlet pipe 31 of the synthesis gas preheater is connected to the side of the methanol reactor 2, the outlet pipe 32 of the synthesis gas preheater is connected to the upper end of the methanol reactor 2, the synthesis gas outlet heat exchanger 1 is also provided with a synthesis gas inlet pipe 24 and a synthesis gas outlet pipe 25, the synthesis gas inlet pipe 24 is connected to the bottom of the methanol reactor 2, and the synthesis gas outlet pipe 25 is connected to the methanol condenser 4.

[0021] The methanol reactor 2 includes a reaction shell 21, in which a catalytic reaction column 22 is arranged, and support plates 23 are arranged at both ends of the catalytic reaction column 22. The catalytic reaction column 22 is connected to the reaction shell 21 through the support plates 23. A raw gas bypass pipe 5 is arranged between the raw gas inlet pipe 11 and the inlet pipe 31 of the synthesis gas preheater, and a raw gas bypass regulating valve 6 is fixedly arranged on the raw gas bypass pipe 5. A synthesis gas preheating temperature transmitter 33 is arranged on the synthesis gas preheater 3, and the synthesis gas preheating temperature transmitter 33 is fixedly connected to the synthesis gas preheater 3. An inlet temperature transmitter 26 is arranged at the top of the methanol reactor 2, and the inlet temperature transmitter 26 is fixedly connected to the methanol reactor 2. A catalyst temperature transmitter 27 is arranged in the middle of the methanol reactor 2, and the catalyst temperature transmitter 27 is fixedly connected to the methanol reactor 2. A bottom temperature transmitter 28 and an outlet temperature transmitter 29 are arranged at the bottom of the methanol reactor 2, and both the bottom temperature transmitter 28 and the outlet temperature transmitter 29 are fixedly connected to the methanol reactor 2.

[0022] The working principle of the utility model is to provide heat to the system by means of electric heating, thus avoiding the unsafe factors of steam pipe heating and heat transfer oil heating, while making full use of the waste heat of the synthesis gas, reducing the frequency modulation times of the preheater, realizing automatic control, playing a role in effectively controlling the temperature of the methanol reactor and increasing the safety of the synthesis system.

[0023] Heat is supplied to the system by electric heating, which reduces piping layout, reduces costs, improves safety, and ensures stable operation of the system. The principle of waste heat recovery is used to fully utilize the large amount of heat generated by the reaction and the heat of the synthesis gas, saving energy while improving the condensation effect of the methanol condenser. The automatic control interlocking system automatically adjusts the opening of the raw gas bypass valve according to the temperature of each part of the system to stabilize the temperature, reduce human intervention, and achieve automated steady-state operation. The opening of the raw gas bypass valve is controlled by the automatic control system, and the temperature of the methanol reactor system is adjusted to make the temperature tend to be stable, increasing the safety of the system, while reducing the frequent adjustment of the synthesis gas preheater power, thereby increasing the service life of the synthesis gas preheater.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature-stable and controllable methanol synthesis control system, characterized in that: It includes a synthesis gas outlet heat exchanger, a methanol reactor, a synthesis gas preheater and a methanol condenser. The synthesis gas outlet heat exchanger is connected to a raw gas inlet pipe and a raw gas outlet pipe, the raw gas outlet pipe is connected to the methanol reactor, the inlet pipe of the synthesis gas preheater is connected to the side of the methanol reactor, the outlet pipe of the synthesis gas preheater is connected to the upper end of the methanol reactor, the synthesis gas outlet heat exchanger is also provided with a synthesis gas inlet pipe and a synthesis gas outlet pipe, the synthesis gas inlet pipe is connected to the bottom of the methanol reactor, the synthesis gas outlet pipe is connected to the methanol condenser, a raw gas bypass pipe is provided between the raw gas inlet pipe and the inlet pipe of the synthesis gas preheater, and a raw gas bypass regulating valve is fixedly provided on the raw gas bypass pipe.

2. A temperature-stable and controllable methanol synthesis control system according to claim 1, characterized in that: The methanol reactor comprises a reaction shell, a catalytic reaction column is arranged in the reaction shell, support plates are arranged at both ends of the catalytic reaction column, and the catalytic reaction column is connected to the reaction shell through the support plates.

3. A temperature-stable and controllable methanol synthesis control system according to claim 1, characterized in that: The synthesis gas preheater is provided with a synthesis gas preheating temperature transmitter, and the synthesis gas preheating temperature transmitter is fixedly connected to the synthesis gas preheater.

4. A temperature-stable and controllable methanol synthesis control system according to claim 1, characterized in that: An inlet temperature transmitter is arranged at the top of the methanol reactor, and the inlet temperature transmitter is fixedly connected to the methanol reactor.

5. A temperature-stable and controllable methanol synthesis control system according to claim 1, characterized in that: A catalyst temperature transmitter is arranged in the middle of the methanol reactor, and the catalyst temperature transmitter is fixedly connected to the methanol reactor.

6. A temperature-stable and controllable methanol synthesis control system according to claim 1, characterized in that: A bottom temperature transmitter and an outlet temperature transmitter are arranged at the bottom of the methanol reactor, and both the bottom temperature transmitter and the outlet temperature transmitter are fixedly connected to the methanol reactor.

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