阅读说明：本技术 一种ugi炉的自动提温和制惰方法 (Automatic temperature raising and inert making method of UGI furnace ) 是由 万武军 李明 夏述军 于 2020-12-11 设计创作，主要内容包括：本发明公开了一种UGI炉的自动提温和制惰方法,在提温程序固化出单独窗口,设置出四个阶段,每个阶段设置放空开关和回收开关,各个阶段时间之和等于循环时间,在提温送气程序中,回收和放空时间之和等于所在阶段的时间,从而保证循环时间不变,提温送气时,只需将各个阶段的放空和回收时间输入控制组件,启动提温程序,操作人员通过DCS监控半水煤气的变化,调整上吹阶段的放空时间即可；在制惰流程中,在下行阀和煤气总阀之间加装一个下行放空阀,使蒸汽气化剂能从上向下穿过气化层,从而稳定气化层,同时将下行放空阀和煤气总阀进行油路连锁。本发明自动运行,减少人为操作存在失误和不安全因素,安全系数高,制惰时无需备用炉,可连续制惰。(The invention discloses an automatic temperature raising and inerting method of a UGI furnace, wherein a temperature raising program is solidified to form an independent window, four stages are arranged, each stage is provided with an emptying switch and a recovery switch, the sum of the time of each stage is equal to the cycle time, and in a temperature raising and air supplying program, the sum of the recovery time and the emptying time is equal to the time of the stage, so that the cycle time is not changed; in the inerting process, a down vent valve is additionally arranged between the down valve and a gas main valve, so that a steam gasification agent can penetrate through a gasification layer from top to bottom, the gasification layer is stabilized, and the down vent valve and the gas main valve are linked in an oil way. The invention has the advantages of automatic operation, high safety factor, no need of standby furnace during inert gas preparation and continuous inert gas preparation, and reduces the error and unsafe factors of manual operation.)

1. An automatic temperature raising and inert making method of a UGI furnace is characterized in that: setting four stages, namely a blowing stage, an upward blowing stage, a downward blowing stage and a secondary upward blowing stage, wherein each stage is provided with an emptying switch and a recovery switch, the recovery and emptying time is adjusted in different stages by setting, and the sum of the time of each stage is equal to the cycle time;

during temperature raising and air supplying, the sum of the recovering time and the emptying time is equal to the time of the stage, so that the cycle time is not changed, when the temperature raising and air supplying are carried out, only the emptying time and the recovering time of each stage are input into a control assembly, a temperature raising program is started, an operator monitors the change of the semi-water gas through a DCS, and the emptying time of an up-blowing stage is adjusted;

in the inert gas making process, a downlink emptying valve is arranged between the downlink valve and a gas main valve, so that a steam gasification agent can penetrate through a gasification layer from top to bottom, the gasification layer is stabilized, the uplink overhigh generated in the process of long-time inert gas making is reduced, the downlink emptying valve and the gas main valve are linked in an oil way, the two valves are mutually opened and closed, the replacement time is saved, the content of CO in the prepared inert gas is reduced, and a fan is connected to a gas making furnace for continuously inert gas making.

2. The automatic temperature raising and inert suppressing method of the UGI furnace according to claim 1, characterized in that: when the inertness is independently produced, the emptying time is adjusted to 0s in the blowing stage, the recovery time is the blowing time, and all other gas production stages are emptied; when the temperature is raised and air is supplied, the air blowing stage is adjusted to the maximum air blowing time and is not recycled, the air blowing time is set to be 30s in the upward blowing stage, and the recycling time is set to be 15 s.

3. The automatic temperature raising and inert suppressing method of the UGI furnace according to claim 1, an operation step of reforming an existing UGI furnace, characterized in that: selecting a spare DCS host to write configuration data, operating one UGI furnace independently, observing whether an output signal is correct, and writing the operation configuration after 7 × 24 hours are correct; safe seamless butt joint is realized; according to the scheduled maintenance time of the UGI furnace, the reconstruction of a downstream emptying valve and the program verification implementation of automatic temperature raising are well carried out; making related mode oil way interlocking setting; writing related operation items and operation procedures.

Technical Field

The invention relates to a control method of a UGI furnace, in particular to an automatic temperature raising and inert control method of the UGI furnace.

Technical Field

In the synthetic ammonia industry, before a pressurized gasification furnace is not technically mature, a furnace type selected by a small nitrogen fertilizer enterprise is a fixed bed intermittent gasification furnace (UGI furnace) all the time, and the fixed bed intermittent gasification furnace has the advantages of low investment, simple flow and simple and convenient start and stop. Along with various technical advances and UGI energy-saving reconstruction, DCS control optimization and technical development are always deficient, which is mainly determined by the characteristics of a UGI furnace type, procedural control is realized, no other space exists, particularly, after overhaul, furnace start and temperature raising operation is carried out, although procedural operation is carried out, the time of each stage and the sequence and steps of the start stage are manually controlled, operators have to be very concentrated, errors can occur due to carelessness, gas quality is unqualified and safety accidents are caused, the pressure of the operators is very large, many small nitrogen fertilizer enterprises have problems in the replacement process of furnace start and stop, enterprise shutdown and accidents are caused, the operational pressure and workload of the operators are reduced, the UGI furnace which is operated at present is optimized and equipment is reconstructed, and the reconstruction effects of automatically raising temperature and controlling the inert flow are realized, is very necessary.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide an automatic temperature raising and inerting method for a UGI furnace.

In order to achieve the purpose, the technical means adopted by the invention is as follows: a UGI furnace automatic temperature raising and inert making method is characterized in that a temperature raising program is solidified to form an independent window, four stages are arranged, namely a blowing stage, an upward blowing stage, a downward blowing stage and a secondary upward blowing stage, each stage is provided with an emptying switch and a recovery switch, the recovery and emptying time is adjusted in different stages through setting, and the sum of the time of each stage is equal to the cycle time;

during temperature raising and air supplying, the sum of the recovering time and the emptying time is equal to the time of the stage, so that the cycle time is not changed, when the temperature raising and air supplying are carried out, only the emptying time and the recovering time of each stage are input into a control assembly, a temperature raising program is started, an operator monitors the change of the semi-water gas through a DCS, and the emptying time of an up-blowing stage is adjusted;

in the inert gas making process, a downlink emptying valve is arranged between the downlink valve and a gas main valve, so that a steam gasification agent can penetrate through a gasification layer from top to bottom, the gasification layer is stabilized, the uplink overhigh generated in the process of long-time inert gas making is reduced, the downlink emptying valve and the gas main valve are linked in an oil way, the two valves are mutually opened and closed, the replacement time is saved, the content of CO in the prepared inert gas is reduced, and a fan is connected to a gas making furnace for continuously inert gas making.

The UGI gasification furnace belongs to intermittent gasification, the gasification is divided into ascending coal gas and descending coal gas, and the ascending coal gas and the descending coal gas are output to a combined superheater through a coal gas main valve for heat exchange, then enter a gas washing tower and finally enter a gas holder. A downstream emptying valve is additionally arranged between a gas downstream valve and a gas main valve, in the process of inerting, a steam gasifying agent can penetrate through a bed layer from top to bottom to compress a gasifying layer and stabilize the position of the gasifying layer at the same time, instead of the prior inerting downward blowing steam for gasifying on the surface of a gasification furnace, the steam gasifying agent cannot effectively penetrate through the gasifying layer to cause the reduction layer of the gasification furnace to be too high, so that CO in the inerting gas is high, and continuous inerting cannot be realized.

Further, when the inertness is independently generated, the emptying time is adjusted to 0s in the blowing stage, the recovery time is the blowing time, and all other gas generation stages are emptied; when the temperature is raised and air is supplied, the air blowing stage is adjusted to the maximum air blowing time and is not recycled, the air blowing time is set to be 30s in the upward blowing stage, and the recycling time is set to be 15 s.

Further, the specific operation steps for modifying the existing UGI furnace by utilizing the automatic temperature raising and inert control method of the UGI furnace are as follows: selecting a spare DCS host to write configuration data, independently operating one UGI furnace, observing whether an output signal is correct, and writing the operation configuration after 7 x 24 hours are correct to realize safe seamless butt joint; according to the scheduled maintenance time of the UGI furnace, the reconstruction of a downstream emptying valve and the program verification implementation of automatic temperature raising are well carried out; making related mode oil way interlocking setting; writing related operation items and operation procedures.

The beneficial technical effects of the invention are as follows:

1. only the emptying and recovery time of each stage needs to be input, the temperature raising program automatically runs, an operator only needs to monitor the change of the semi-water gas through the DCS and adjust the emptying time of the upblow stage, a large amount of emptying gas is saved, the operation is very simple and convenient, the operation difficulty is reduced compared with the high-concentration operation of temperature raising in the previous stage, the post operation can be completed, the programmed operation reduces the human operation errors and unsafe factors, and the safety coefficient of the device is further improved;

2. a downstream vent valve is additionally arranged between the downstream valve and a gas main valve, so that a steam gasification agent can vertically penetrate through a gasification layer, the gasification layer is stabilized, the phenomenon that the inert gas preparation is unqualified due to overhigh ascending caused by long-time inert gas preparation is reduced, and the defect that a plurality of UGI furnaces are required to be reserved simultaneously in the conventional inert gas preparation is overcome;

3. carry out the oil circuit interlock with down atmospheric valve and gas main valve, practice thrift a large amount of replacement time for the CO content of the inert gas of preparing reduces to 2% from 7% before, makes the factor of safety of parking overhaul replacement obtain improving, and the combustible gas proportion in the inert gas that the replacement was used descends, reduces the replacement risk, thereby can carry out continuous system inertia, has improved the replacement speed greatly, shortens small nitrogen fertilizer enterprise maintenance time by a wide margin, has improved factor of safety.

Drawings

FIG. 1: the invention UGI flow chart;

FIG. 2: the invention relates to a temperature-raising air-feeding program diagram.

The specific implementation mode is as follows:

we know that the existing UGI furnace is divided into five stages, respectively: the method comprises a blowing stage, an upward blowing stage, a downward blowing stage, a secondary upward blowing stage and a blowing-out stage, wherein the five stages are controlled by an existing DCS program to circularly act to achieve the purpose of gas making, the existing temperature raising program is manual operation in the stages and only responsible for providing operation of a certain stage, and the operation sequence and time can not be provided, so that the operation personnel of the UGI furnace need to select the time of each stage according to the furnace condition and perform according to the gas quality condition, the recovery and emptying of effective gas and unqualified gas are generally performed by only workshop management personnel, and the post operation personnel do not dare to try the manual operation for more than 5 years, particularly under the current strictly-required safety environment.

In order to solve the problem, an automatic temperature raising and inerting method of the UGI furnace is researched, and improvement is carried out from two aspects.

Firstly, a temperature raising program is solidified to form an independent window, four stages are set, as shown in figure 2, an emptying switch and a recovery switch of each stage are set, the time is adjustable, the sum of the recovery time and the emptying time is equal to the stage time, the sum of the stage time is equal to the cycle time, when the air is raised and supplied in daily time, the emptying time and the recovery time of each stage are input, the temperature raising program is started, the program automatically runs, an operator only needs to monitor the change of semi-water gas through a DCS (distributed control System), and adjust the emptying time of an upblow stage, so that a large amount of emptying gas is saved, the operation is very simple and convenient, the operation difficulty is reduced compared with the prior highly centralized operation of stage temperature raising, the operation of a post can be completed, the programmed operation reduces human operation errors and unsafe factors, and further improves the safety coefficient of the device;

secondly, in the inert gas preparation process, a down blow-down valve with the length of 530mm in the front is additionally arranged between a down valve and a gas main valve, as shown in figure 1, a steam gasification agent can vertically pass through a gasification layer, so that the effect of stabilizing the gasification layer is achieved, the phenomenon that inert gas preparation is unqualified due to overhigh upward speed caused by long-time inert gas preparation is reduced, the defect that a plurality of UGI furnaces are required to be used simultaneously when the original inert gas preparation is carried out is avoided, meanwhile, the down blow-down valve and the gas main valve are linked in an oil way (namely, two valves cannot be simultaneously opened, only one valve can be opened, and the other valve is opened) without increasing an electromagnetic valve, the oil way is simply changed, a large amount of replacement time is saved, the CO content of the prepared inert gas is reduced to 2% from the previous 7%, a set of fan can be continuously arranged to continuously prepare the inert gas, the replacement speed is greatly improved, a large amount of time is saved, and half of time can be saved according to the calculation of, greatly shortens the maintenance time of small nitrogen fertilizer enterprises and improves the safety factor.

The invention is based on the optimization and improvement development of the technological operation of the fixed bed gasification furnace of the synthetic ammonia, integrates the DCS automatic optimization operation to realize the automatic programming of the temperature raising and gas feeding of the UGI furnace and simultaneously improve the gas quality components of the inert gas preparation, and is an invention for optimizing the operation and improvement of the UGI furnace.

The invention aims to reduce the errors and unsafe factors caused by manual operation, essentially improve the safety of the device, also overcome the defects of the prior device and improve the inerting speed and the purity of inerting gas. The whole system is controlled automatically, the installation is simple, and the operability is strong.

The method comprises the following specific operation steps of modifying the conventional UGI furnace:

and selecting a spare DCS host to write configuration data, and independently operating a UGI furnace to determine whether an output signal is correct or not, so that the operation configuration is written after 7 × 24 hours are correct. Safe seamless butt joint is realized; modifying a downstream emptying valve and carrying out program verification of automatic temperature raising according to planned maintenance of the UGI furnace; making related mode oil way interlocking setting; writing related operation items and operation procedures.

The above-mentioned steps are preferred embodiments of the present invention, and the technical idea and the implementation gist of the present invention are explained in detail, and the scope of the present invention is not limited thereto, and any simple modification and equivalent structural change or modification made according to the spirit of the present invention should be covered within the scope of the present invention.