CN-122004507-A - Startup preheating method of sheet cut-tobacco drier and cut-tobacco drier pipeline system

CN122004507ACN 122004507 ACN122004507 ACN 122004507ACN-122004507-A

Abstract

The invention belongs to the technical field of sheet cut-tobacco dryers, and discloses a startup preheating method of a sheet cut-tobacco dryer and a cut-tobacco dryer pipeline system. The pressure building mode of the startup preheating method of the sheet cut-tobacco drier comprises the following steps that a main hot air pipeline reaches 50% of a set value, steam pipelines of a first area and a second area are both larger than 0bar, a first pneumatic film regulating valve is firstly opened to 5% of the set value, a second pneumatic film regulating valve is opened to 5% of the set value, the main hot air pipeline reaches 100% plus 5 ℃ of the set value, when condensate water pipelines of the two areas are both more than or equal to 0kg/h, the first pneumatic film regulating valve and the second pneumatic film regulating valve are respectively opened to 10% of the set value, when condensate water pipelines of the two areas are both more than or equal to 50 ℃, the first pneumatic film regulating valve and the second pneumatic film regulating valve are respectively opened to 15% of the set value, and when the pressure value of the steam pipeline of the first area is more than 0.5bar and the pressure value of the steam pipeline of the second area is more than 0.25bar, the heating mode is entered. The invention enables condensed water of the sheet cut-tobacco drier to be smoothly discharged.

Inventors

LI RONG
Tong Dawen
LI CHENGYUN
CHEN HAIMING
LI ZHIHONG
TIAN KAI
GUO YE
NIU WENWEI
WANG HAOGUI
MENG JINFU

Assignees

红云红河烟草(集团)有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260401

Claims (10)

1. The startup preheating method of the sheet cut-tobacco dryer is characterized by comprising a pressure building mode, wherein the pressure building mode comprises the following steps of: s1, opening a main steam control valve (111) and a third pneumatic film regulating valve (161) to enable the temperature of hot air in a main hot air pipeline (31) to reach 50% of a hot air set value required by production, and setting the opening time to be 5min; S2, detecting pressure values of a first area steam pipeline (12) and a second area steam pipeline (13), when the pressure values are both larger than 0bar, firstly opening a first pneumatic film regulating valve (121) to 5% of a set value of steam required by first area production, setting the opening time for 5min, and then opening a second pneumatic film regulating valve (131) to 5% of the set value of steam required by second area production, setting the opening time for 5min; S3, adjusting a third pneumatic film adjusting valve (161) to enable the temperature of hot air in a main hot air pipeline (31) to reach 100% of a hot air set value required by production plus 5 ℃, detecting the flow of condensed water in a first area condensed water pipeline (22) and a second area condensed water pipeline (23), and if the flow values are not less than 0kg/h, respectively opening the first pneumatic film adjusting valve (121) and the second pneumatic film adjusting valve (131) to 10% of a steam set value required by production in the first area and 10% of a steam set value required by production in the second area, and setting the opening time to be 10min; S4, detecting the temperature values of condensed water in the first area condensed water pipeline (22) and the second area condensed water pipeline (23), if the temperature values are not less than 50 ℃, respectively opening the first pneumatic film regulating valve (121) and the second pneumatic film regulating valve (131) to 15% of a set value of steam required by the first area production and 15% of a set value of steam required by the second area production, and setting the opening time to 10min; S5, detecting pipeline pressure values of the first-region steam pipeline (12) and the second-region steam pipeline (13), and entering a heating mode if the pipeline pressure value of the first-region steam pipeline (12) is more than 0.5bar and the pipeline pressure value of the second-region steam pipeline (13) is more than 0.25 bar.
2. The method for preheating the sheet cut-tobacco dryer in startup according to claim 1, wherein in the step S1, whether the values of the first temperature sensor (321) and the second temperature sensor (1032) are consistent is compared, if so, the valve opening of the third pneumatic film regulating valve (161) is kept unchanged, otherwise, the temperature of the preheating hot air is abnormal.
3. The method according to claim 1, wherein in the step S2, if the pressure values of the first area steam line (12) and the second area steam line (13) are both less than 0bar, the alarm output pipeline is abnormal in pressure, and the first manual control valve (143) and the second manual control valve (153) are closed.
4. The method according to claim 1, wherein in the step S4, if the temperature values of the condensed water in the first zone condensed water pipeline (22) and the condensed water in the second zone condensed water pipeline (23) are both less than 50 ℃, the first pneumatic film regulating valve (121) and the second pneumatic film regulating valve (131) are opened to 18% of the set value of the steam required for the first zone production and 18% of the set value of the steam required for the second zone production respectively until the temperature values are both equal to or greater than 50 ℃.
5. The startup preheating method of a sheet cut-tobacco dryer according to claim 1, characterized in that in the step S5, if the pipe pressure value of the first zone steam pipe (12) is not greater than 0.5bar and the pipe pressure value of the second zone steam pipe (13) is not greater than 0.25bar, the first pneumatic film regulating valve (121) and the second pneumatic film regulating valve (131) are opened to 20% of the first zone production required steam set point and 20% of the second zone production required steam set point, respectively.
6. The method for preheating a sheet cut-tobacco dryer at startup according to any one of claims 1 to 5, wherein the temperature raising mode includes the steps of: S6, adjusting the third pneumatic film adjusting valve (161) to enable the temperature of hot air in the main hot air pipeline (31) to reach 100% of a hot air set value required by production; S7, respectively opening the first pneumatic film regulating valve (121) and the second pneumatic film regulating valve (131) to 20% of a steam set value required by the first zone production and 20% of a steam set value required by the second zone production, wherein the opening time is 15min.
7. The method according to claim 6, wherein in step S7, the pipe pressure values of the first zone steam pipe (12) and the second zone steam pipe (13) are detected, and if the pipe pressure value of the first zone steam pipe (12) is >0.7bar and the pipe pressure value of the second zone steam pipe (13) is >0.7bar, the temperature raising mode is completed.
8. The startup preheating method of a sheet cut-tobacco dryer according to claim 7, characterized in that if the pipe pressure value of the first zone steam pipe (12) is not greater than 0.7bar and the pipe pressure value of the second zone steam pipe (13) is not greater than 0.7bar, the first pneumatic film regulating valve (121) and the second pneumatic film regulating valve (131) are opened to 22% of the first zone production required steam setting value and 22% of the second zone production required steam setting value, respectively.
9. Cut-tobacco dryer pipe system, characterized in that a sheet cut-tobacco dryer start-up preheating method according to any of claims 1-7 is used for controlling the cut-tobacco dryer pipe system, the cut-tobacco dryer pipe system comprising: The hot air supply unit (3) comprises a main hot air pipeline (31) and a secondary hot air pipeline (32) communicated with the main hot air pipeline (31), wherein the secondary hot air pipeline (32) is used for being connected into a drying cylinder (102) of the sheet cut-tobacco dryer (100), a first temperature sensor (321) is arranged on the secondary hot air pipeline (32), a second temperature sensor (1032) is arranged in a moisture removal pipeline (1031) of the sheet cut-tobacco dryer (100), and a heat exchanger (311) is arranged in the main hot air pipeline (31); the steam supply unit (1) comprises a main steam pipeline (11), a first area steam pipeline (12), a second area steam pipeline (13), a first external pipeline (14), a second external pipeline (15) and a hot air steam pipeline (16), wherein the hot air steam pipeline (16), the first area steam pipeline (12) and the second area steam pipeline (13) are all communicated with the main steam pipeline (11), one end of the hot air steam pipeline (16) is communicated with a heat exchange inlet of the heat exchanger (311), the first area steam pipeline (12) is connected with a first area steam inlet of a rotary joint (101) of the sheet tobacco dryer (100), the second area steam pipeline (13) is connected with a second area steam inlet of the rotary joint (101) of the sheet tobacco dryer (100), one end of the first external pipeline (14) is communicated with the first area steam pipeline (12), the other end of the first external pipeline (14) is provided with a first pressure gauge (141) and a first vacuum valve (142), and the other end of the second external pipeline (14) is connected with a second vacuum valve (15) in parallel, and the other end of the second external pipeline (14) is connected with a second vacuum gauge (151); The condensate recovery unit (2) comprises a condensate water tank (21), a first area condensate water pipeline (22), a second area condensate water pipeline (23) and a heat exchange condensate water pipeline (24), wherein the heat exchange condensate water pipeline (24), the first area condensate water pipeline (22) and the second area condensate water pipeline (23) are both communicated with the condensate water tank (21), one end of the heat exchange condensate water pipeline (24) is communicated with a heat exchange outlet of the heat exchanger (311), the first area condensate water pipeline (22) is used for being connected with a first area condensate water outlet of a rotary joint (101) of the sheet tobacco dryer (100), the second area condensate water pipeline (23) is used for being connected with a second area condensate water outlet of the rotary joint (101) of the sheet tobacco dryer (100), a first area flow sensor (221) and a third temperature sensor (222) are arranged on the first area condensate water pipeline (22), and a second area flow sensor (231) and a fourth temperature sensor (232) are arranged on the second area condensate water pipeline (23).
10. Cut tobacco dryer pipeline system according to claim 9, characterized in that the main steam pipeline (11) is provided with a main steam control valve (111), the first zone steam pipeline (12) is provided with a first pneumatic film regulating valve (121), the second zone steam pipeline (13) is provided with a second pneumatic film regulating valve (131), the hot air steam pipeline (16) is provided with a third pneumatic film regulating valve (161), the first outer connecting pipe is provided with a first manual control valve (143), and the second outer connecting pipe is provided with a second manual control valve (153).

Description

Startup preheating method of sheet cut-tobacco drier and cut-tobacco drier pipeline system Technical Field The invention relates to the technical field of sheet cut-tobacco dryers, in particular to a startup preheating method of a sheet cut-tobacco dryer and a cut-tobacco dryer pipeline system. Background The thin plate cut tobacco dryer is one of key equipment equipped on a cut tobacco manufacturing production line, and mainly aims to dry cut tobacco so as to form cut tobacco meeting the technological requirements. The sheet cut tobacco dryer is a drum type cut tobacco dryer taking steam as a heat source, and adopts a conduction-convection combined drying mode to enable cut tobacco to be quickly dried and shaped, so that the crimping degree and elasticity are increased, the quality and filling value of the cut tobacco are improved, and the water content required by a cut tobacco drying process is achieved. The existing two-section sheet cut-tobacco dryer is provided with two independently controlled cut-tobacco drying areas which are divided into a1 area and a 2 area. The working process of the existing two-section type thin-plate cut-tobacco drier comprises the steps of basic state, preheating stage, operation preparation stage, starting stage, restarting stage, production stage, ending production ending stage, cooling and the like. The startup mode of the existing sheet cut-tobacco drier is in a preheating stage (a pressure building stage and a temperature rising stage), a steam regulating valve in a steam pipeline system is opened, and steam enters a pipeline and a sheet. After the condensed water in the pipeline and the thin plate is eliminated, the high-pressure steam can gradually build steam pressure in the areas 1 and 2 of the thin plate, and the temperature of the thin plate rises after a period of time. Because back pressure exists in the recovery of the sheet condensate water of the two-section sheet cut-tobacco drier (namely partial vacuum exists in the sheet), the condensate water is not smoothly discharged or can not be timely discharged in the starting-up mode of the sheet cut-tobacco drier. When the condensed water in the thin plate and the pipeline is not smoothly discharged or can not be timely discharged, firstly, accumulated water is generated in the thin plate type cut-tobacco drier, the heat exchange efficiency is reduced, so that the temperature control of a system is unstable, secondly, the impact damage of a water hammer to the thin plate can be generated in the process that steam enters the pipeline and the thin plate, thirdly, the thin plate of equipment is corroded, scale is generated, the water hammer is triggered, the thin plate is damaged, the thin plate is cracked and leaked, and fourthly, the preheating time of the equipment is long in the production of working, the temperature fluctuation of the cylinder wall is large, and the quality of the product cannot be guaranteed. Disclosure of Invention The invention aims to provide a startup preheating method and a pipeline system of a sheet cut-tobacco dryer, which can solve the problems that condensed water is not smoothly discharged or can not be discharged in time in the startup mode of the sheet cut-tobacco dryer. To achieve the purpose, the invention adopts the following technical scheme: the startup preheating method of the sheet cut-tobacco dryer comprises a pressure building mode, wherein the pressure building mode comprises the following steps of: s1, opening a main steam control valve and a third pneumatic film regulating valve to enable the temperature of hot air in a main hot air pipeline to reach 50% of a hot air set value required by production, and setting the opening time to be 5min; S2, detecting pressure values of the first area steam pipeline and the second area steam pipeline, when the pressure values are both larger than 0bar, firstly opening the first pneumatic film regulating valve to 5% of a steam set value required by first area production, and setting the opening time to 5min; S3, adjusting a third pneumatic film adjusting valve to enable the temperature of hot air in a main hot air pipeline to reach 100% of a hot air set value required by production and 5 ℃, detecting the flow of condensed water in a first area condensed water pipeline and a second area condensed water pipeline, and if the flow values are not less than 0kg/h, respectively opening the first pneumatic film adjusting valve and the second pneumatic film adjusting valve to 10% of a steam set value required by production in the first area and 10% of a steam set value required by production in the second area, and setting the opening duration to 10min; s4, detecting the temperature values of condensed water in the first area condensed water pipeline and the second area condensed water pipeline, if the temperature values are not less than 50 ℃, respectively opening the first pneumatic film regulating valve and the second pneumatic film regulati