Fresh air temperature control system for preparing acrylic acid by propylene two-step oxygenation method
A technology of temperature control system and fresh air, which is applied in the direction of temperature control, control/regulation system, non-electric variable control, etc. It can solve the problems of unstable mixed gas temperature, affecting catalyst performance, affecting acrylic acid yield, etc., to ensure temperature , reduce heat energy consumption, improve the effect of conversion rate
Active Publication Date: 2010-09-22
中石油吉林化工工程有限公司
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Problems solved by technology
Taking an 80,000-ton / year acrylic acid unit as an example, the performance of a certain manufacturer’s oxidation catalyst requires that the temperature of the mixed gas at the inlet of the first oxidation reactor be in the range of 150°C to 200°C, that is, the temperature of the fresh air feed before mixing is required to be controlled above 160°C. The device is equipped with an air heater between the feed mixer M-1002 and the first reactor R-1001, which consumes a lot of energy, and the operation of the device is disturbed by the continuous change of the ambient temperature, so that it enters the first reactor R-1001 The temperature of the mixed gas is unstable, which affects the performance of the catalyst and the yield of acrylic acid
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[0010] The present invention is described in further detail below in conjunction with specific examples.
[0011] Existing devices of the same type are provided with an air heater between the feed mixer M-1001 and the first reactor R-1001, and use medium and low pressure steam as a heat source, but the present invention cancels it, reduces equipment, and reduces equipment Construction cost, reduce energy consumption, reduce production cost, use the first oxidation reactor R-1001 auxiliary equipment - air preheater H-1001 electric heater to adjust the temperature of the mixed gas at the inlet of the first reactor; There is a TRC-1001 thermocouple on the pipeline in front of the pre-mixer M-1001, equipped with a temperature transmitter, and the output signal of the temperature transmitter enters the DCS system of the device, and its DCS output signal controls the air preheater H-1001 Electric heater group, control the temperature of the air before it enters the pre-mixer M-1001 ...
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The invention discloses a fresh air temperature control system for acrylic acid preparation through a propylene two-step oxygen-adding method, which is characterized in that: a TRC-1001 thermocouple is arranged on a pipeline in front of a compressed air inlet premixer; the invention is provided with a temperature transmitter; the temperature transmitter outputs signals entering a DCS system of a device; DCS output signals of the invention control the class of electric heater of an air preheater; the temperature in front of the compressed air inlet premixer is controlled to be between 160 DEG C and 170 DEG C. Cold areas are great in the changes of atmospheric environmental temperature at four seasons and are great even in temperature difference of daytime and nighttime. The invention has the advantages that: the fresh air temperature control system can ensure that the feed temperature of fresh air is controlled in a permissible operating temperature range of catalyst performance, guarantee stable temperature of mixed gas, save the steam amount of the device, reduce heat consumption and avoid the interference to device operation caused by the changes of environmental temperature, soas to improve propylene conversion rate as well as acrylic acid yield and reduce production cost.
Description
technical field [0001] The invention relates to an automatic control system in acrylic acid production. technical background [0002] The two-step oxygenation of propylene to produce acrylic acid is carried out in the presence of an oxidation catalyst. The first step is to oxidize propylene to form acrolein, and the second step is to further oxidize acrolein to produce acrylic acid. The reaction equation is as follows: [0003] CH 2 =CH-CH 3 +O 2 →CH 2 =CH-CHO+H 2 o [0004] CH 2 =CH-CHO+1 / 2O 2 →CH 2 =CH-COOH [0005] Fresh air provides oxygen to participate in chemical reactions. In the acrylic acid oxidation reaction, the amount of fresh air is large, and the use of oxidation catalysts from different manufacturers has different requirements for the feed temperature of fresh air. Taking an 80,000-ton / year acrylic acid unit as an example, the performance of a certain manufacturer’s oxidation catalyst requires that the temperature of the mi...
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IPC IPC(8): C07C57/05G05D23/20
Inventor 巩传志李欣平刘学线李志远周江沛孙伟张木兰刘丽娟郭勇纪忠斌
Owner 中石油吉林化工工程有限公司