A method of automatic alignment temperatures in groups of three regenerators

 

(57) Abstract:

Usage: the invention relates to the regulation of the mode of heat exchangers operating in cyclic mode switching threads, and can be used to stabilize the switching temperature regenerator units for separation of gas mixtures by the method of deep cooling. Essence: in the method of automatic alignment of the temperature switch in groups of three regenerators by shifting moments of switching at a constant purge period in the current cycle at the time of switching fixed temperature switching regenerators and in the next cycle switches leave the temperature setting of the regenerator constant, if the third regenerator setting, the time of the first controllable switch is determined by the average value of the temperature of cold ends of the three regenerators of the group given temperature change switch setting regenerator in the current cycle, if the first regenerator group is asking, the time of the second controlled switch is determined by the average value of the temperature of cold ends of the three regenerators of the group taking into account the temperature switch setting and the other is of the temperatures of the switching regenerators and to reduce the energy consumption for production of oxygen. 3 Il.

The invention relates to the regulation of the mode of heat exchangers operating in cyclic mode switching threads, and can be used to stabilize the switching temperature regenerator units for separation of gas mixtures by the method of deep cooling.

There is a method of automatic alignment temperatures, in groups of three regenerators at a constant period purging by shifting two moments of switching on 1/3 of mismatch temperatures (means) define and compare regenerators in the direction of the lead or lag depending on the sign of the error [ed.St. The USSR 355971, CL 01 D 53/00, 1971].

The disadvantage of this method is the low accuracy of the temperatures cold ends, because there is an ambiguity reactions cross sections along the height in the middle and at the cold end to changes in heat load due to the nonlinear nature of the change of temperature with height of the regenerator, resulting in worsening of the temperature conditions that determine nezabyvaemost regenerators, changing their characteristics and increases the hydraulic resistance. In addition, the freezing air impurities to promiscuity received information.

There is a method of automatic alignment temperatures in groups of three regenerators at a constant period purging by shifting two moments of switches, the second of which move at 1/3 of the mismatch value temperature setpoint and compare regenerators in the direction of the lead or lag depending on the sign of the error, and the first switch within the period of shift from the settlement on 4/9 from the above values, and sets the regenerator switch the current moment in time that defines the beginning of the period, while the other two are compared in pairs with the master, with respect to the aforementioned values shift [ed.St. The USSR 900106, CL F 28 F 27/00, 1982].

The disadvantage of this method is that the moments of switching calculated time depending on the moment of the beginning of the run the temperature at the cold end of the regenerator. The criterion for the beginning of the run for all of the regenerators is ambiguous, therefore, additional settings determine when the beginning of the rundown of the regenerators. When the regenerator is very cold, run-down temperature at the cold end of the regenerator does not occur. In addition, when the temperature equalization cold ends of the p is in the current cycle of the switches, which can lead to inaccurate alignment of the temperature switches in the group of regenerators.

The objective of the invention is to improve the efficiency and reliability of the temperatures of the switching regenerator, reducing energy consumption for production of oxygen.

This object is achieved in that in the method of automatic equalization of temperatures in groups of three regenerators, including the shift points of the switches at a constant period purging according to the invention in the current cycle at the time of switching fixed temperature switching regenerators and in the next cycle, the switch leave the temperature setting of the regenerator constant, the moment of the first controllable switch is determined by the average value of the temperature of cold ends of the three regenerators of the group given temperature change switch setting regenerator in the current cycle, the time of the second controlled switch is determined by the average value of the temperature of cold ends of the three regenerators of the group taking into account the temperature variations of the switch setting and the other regenerators in the current cycle of the switches.

The technical result of Doctorow gives high reliability, since the temperature measurement takes place in the thread where the possibility of freezing temperature sensor. Temperature switch regenerator is maintained within -167...-168oWith rundown temperature of 3.5. ..4oWith that reduces falling through the regenerators CO2and hydrocarbons, thereby improving the operation of distillation columns and reducing the specific consumption of air for the production of oxygen.

In Fig.1 shows a graph of the temperature of cold ends of the three regenerators one group provided that the regenerator 1 is the setting of Fig.2 - the same, provided that the regenerator 2 is the setting of Fig.3 - the same, provided that the regenerator 3 is asking;

T1T2T3- temperature switch 1, 2, 3 regenerators, respectively, in the current cycle switching;

T1', T2', T3' - temperature switch 1, 2, 3 regenerators in a different cycle switching;

T1"T2"T3"temperature switch 1, 2, 3 regenerators in the next cycle of the switches;

t1, t2, t3, t4, t5, t6, t7- times of the switches.

Current dir is the ora group at equal intervals of time. The switch is alternately changing a live stream on the back of two regenerators of the group. In the group of three regenerators in any time period, blowing two regenerators passes reverse flow, and one straight. Time reverse blowing two times more time than a straight line, due to the degree of influence of the direct and reverse fluxes on temperature, which is determined by the amount of heat transferred to the data flow nozzle of the regenerator per unit of time. The alignment of the values of the temperature of cold ends of the regenerators is achieved by changing the time forward and reverse purge by shifting the two switches within a period of purging from the calculated moments in the desired direction at a constant period of purging. Shift one shift equally changes the duration of the forward and reverse purge two switchable regenerators.

Example.

For automatic equalization of temperatures in groups of three regenerator the temperature of the regenerator, in which the change of the direct flow on the back made in the estimated time taken for the temperature switch specifies the regenerator and left standing in tech the population available to the mismatch between the two regenerators of the group depending on the choice sets of the regenerator, the time of the second controllable switch is the same between the two regenerators of the group depending on the choice sets of the regenerator.

When the first regenerator was chosen setting, it is switched in the estimated time. For example, at time t1temperature switch 1, 2, 3 regenerators, see Fig.1. At time t2(Fig.1) temperature setting regenerator remained the same T1'=T1. For time t3temperature 1 adjustable switching T2' was determined by the average value of the temperature of cold ends of the three regenerators T2'= (T1'+T2+T3)/3. For time t4the temperature of the 2nd adjustable switching T3' was determined by the temperature of cold ends of the three regenerators T3'= (T1'+T2'+T3)/3, and T1' and T2'the switching temperature of the 1st and 2nd regenerators of the current cycle of the switches, and T3temperature switch 3-th regenerator from the previous cycle of the switching. Due to the fact that the second automatic switching affect the temperature switch specifies the regenerator, by changing the duration of the reverse is mperature first controlled switch T2" (2 th regenerator) was determined by the temperature of cold ends of the three regenerators, at time t6temperature switch was equal to T2"= (T1"+T2'+T3')/3, and T2"the temperature setting of the regenerator in the current cycle of the switches, and T2' and T3' - temperature switches 2-nd and 3-th regenerator from the previous cycle of the switching. The temperature of the 2nd adjustable switching T3" (3rd regenerator) was determined by the temperature of cold ends of the three regenerators, at time t7was equal to T3"= (T1"+T2"+T3')/3, where T1" and T2"temperature switches regenerators in the current cycle of the switches, and T3'is the temperature of the switching of the regenerator from the previous cycle of the switches.

The temperature switch of the first regenerator (Fig. 1) T1=-168,5oWith the first regenerator was setting, the temperature switch of the second regenerator T2= -167,0oWith the temperature switch of the third regenerator T3= -167,5oC, the temperature switch of the second regenerator at time t3equal

T2'=(-168,5+(-167,0)+(-167,5))/3=-167,6oWITH,

and temperature+(T2')+(-167,5))/3=-167,8oC.

Similarly, made the switch in the group of three regenerators, when sets were regenerator 2 (Fig.2) or when the setting was regenerator 3 (Fig.3). Thus, temperature switches regenerators lined up. And the use temperature of the cold end of the regenerators for determining when switching provides high accuracy and reliability, which is confirmed by act of industrial tests.

The inventive method is industrially applicable in control systems thermal regime of installations for separation of gas mixtures by the method of deep cooling of the CT-30, in particular on the air separating units of OJSC "West Siberian metallurgical plant.

Method of automatically aligning temperatures in groups of three regenerators, including the shift points of the switches at a constant period of purging, characterized in that in the current cycle at the time of switching fixed temperature switching regenerators and in the next cycle switches leave the temperature setting of the regenerator constant, and the time of the first controllable switch is determined by the average value of the temperature holo current cycle, and the moment of the second controlled switch is determined by the average value of the temperature of cold ends of the three regenerators of the group taking into account the temperature variations of the switch setting and the other regenerators in the current cycle of the switching.

 

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