CN104404804B - A kind of chemical pulp or dissolving pulp preparation method and test-type displacement cooking device thereof - Google Patents

Abstract

The invention discloses a method for preparing chemical pulp or dissolving pulp and an experimental displacement cooking device thereof, comprising a digester, a hot white liquor tank, a hot black liquor tank, a warm black liquor tank, a washing liquid tank, a circulation pump, and a liquid medicine pump , heating rod, steam generator, flow meter, DCS operating system. The hot white liquor tank, the hot black liquor tank, the warm black liquor tank and the washing liquid tank are connected in parallel to the digester and the steam generator, share the liquid pumping pipeline, the liquid inlet pipeline and the steam pipeline, and the heating rod is installed in the digester The flowmeter is installed on the pipeline for liquid medicine circulation, and the flow meter is installed on the main pipeline entering and leaving the digester. The DCS operating system can display the liquid level, temperature, and pressure of each tank in real time and can control the liquid medicine pump, circulation pump and heating rod switch. The device of the invention has the advantages of reasonable structure, convenient use, simple preparation process and high degree of automation, and can perform displacement and cooking simulation on any pulping raw material.

Description

A method for preparing chemical pulp or dissolving pulp and its experimental displacement cooking device

technical field

The invention relates to a pulping and papermaking process and an experimental device thereof, in particular to a method for preparing chemical pulp or dissolving pulp and an experimental displacement cooking device thereof.

Background technique

With the continuous expansion of enterprise scale and the continuous extension of the industrial chain in the future, energy consumption and total pollutant discharge will increase. Traditional pulp and paper enterprises lack key technologies and core competitiveness for energy conservation and emission reduction. Emission reduction will be more and more restricted by technical bottlenecks. In order to gain a place in the strict environmental protection regulations and fierce market competition, pulp and paper technology must complete the national goal of energy conservation and emission reduction. At present, my country's paper industry has entered the fast lane of low consumption, low pollution, and low emissions, but to truly realize the goals of low consumption, low pollution, and low emissions, it is still necessary to promote a large number of advanced technologies and equipment. The replacement cooking technology introduced in recent years has been widely recognized by the market.

Displacement cooking technology is an energy-saving vertical cooking batch cooking pulping method, which has many advantages, among which, through the replacement of the liquid medicine in the cooking process, the heat energy and chemicals in the upper pot can be reused, and steam saving is the biggest advantage of displacement cooking , the energy consumption is about 1/3 of the traditional cooking method. In addition, replacement cooking is easier to increase production capacity. For projects with a production capacity of less than 200,000 tons, the investment in replacement cooking is low, and it is easier to further increase production capacity; the production capacity of replacement cooking is relatively stable, and a production line composed of parallel cooking pots is used. When there is a problem with the pot, only part of the production capacity of the system is affected; it is simple to replace the cooking pot, and the pot loading operation can be completed only with the belt and the material level switch, and there is no need for a high-precision wood chip metering system; there is no sieve plate in the replacement cooking The clogging problem, after the displacement cooking completes each stage of operation, the circulation pump will be started, on the one hand, the liquid channel of the displacement cooking will be changed, and the temperature of each point in the cooking pot will be uniform, and on the other hand, the recoil recovery sieve plate will be reversed to clear the blockage The "needles" in the recovery sieve plate; displacement cooking is an environmentally friendly cooking method, the degree of sulfurization of displacement cooking is low, less corrosion to equipment, less odor, the degree of sulfuration of continuous cooking is 25-30%, while displacement cooking The degree of vulcanization is 18%; displacement cooking operation is more flexible, displacement cooking can change raw materials and pulp types, displacement cooking can take turns and use different cooking pots to cook coniferous wood, hardwood and bamboo at the same time, each pot has its own formula It is not affected by other pots; replacement cooking has strong adaptability to the quality of wood chips, especially for the poor quality of domestic raw materials, frequent fluctuations, and low pass rate. The classification of raw materials is used for cooking, and different types of raw materials are placed in different cooking. In the pot, different cooking processes are used to cook at the same time to give full play to the advantages of various raw materials, so the replacement cooking can better adapt to the current situation of domestic raw materials; the replacement cooking system can also easily switch to dissolving pulp.

Patent CN203307658 discloses an electric heating replacement cooking pot. The bottom of the pot is equipped with an inlet connected to the liquid circulation pump. Theoretically, the cooking liquid can be added in stages to improve the heating efficiency, prolong the service life of the equipment, and improve the cooking effect. , but in the process of displacement cooking, it is necessary to quantitatively add and quantitatively withdraw the liquid medicine, and the pot needs to maintain a full liquid level state. The above-mentioned device is difficult to realize, and the replacement system is not introduced.

Patent CN202482686 discloses a pulping and cooking equipment with internal and external circulation functions. This equipment is mainly a cooking device, and does not introduce the replacement system. The phenomenon of cut-off and dry pumping, the heater has no protection measures, and it is easy to be damaged by dry burning when there is a partial cut-off in the pipeline.

The process of displacement cooking is the key factor to achieve engineering. Since there is no complete set of equipment for displacement cooking experiments in China, it is impossible to conduct in-depth research on the chemical reaction changes and process regulations in displacement cooking through experiments. The research on displacement cooking systems mainly Focus on technical introduction and overview. Existing experimental devices are difficult to simulate the displacement process of the cooking liquid, and it is difficult to meet the needs of the displacement cooking experiment, and the cost of using the displacement digester to conduct experiments in the factory is too high to be realized. Therefore, it is necessary to develop a displacement cooking method for the laboratory device to meet the needs of the displacement cooking process experiment.

Contents of the invention

The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a method for preparing chemical pulp or dissolving pulp and an experimental displacement cooking device thereof. It solves the technical problems that it is difficult to meet the requirements of the displacement cooking experiment in the prior art, and the cost of using the displacement digester to conduct the experiment in the factory is too high and difficult to realize.

The present invention realizes through following technical scheme:

An experimental displacement cooking device, comprising a digester 1, a hot white liquor tank 2, a hot black liquor tank 3, a warm black liquor tank 4, a washing liquid tank 5, a steam generator 10, and a DCS operating system 11, characterized in that:

The upper liquid port of the digester 1 is communicated with the steam generator 10 through the steam main pipe; the interface end of the steam main pipe and the upper liquid port of the digester 1 is provided with a valve A, and the interface end of the steam main pipe and the steam generator 10 is provided with a valve D ;

The respective liquid inlets of the hot white liquid tank 2, the hot black liquid tank 3, the warm black liquid tank 4, and the washing liquid tank 5 have two interfaces, one of which is connected to the liquid inlet main pipe through the liquid inlet valve 16, and the other interface is connected to the main liquid inlet through the liquid inlet valve 16. The steam valve 18 is connected to the steam main pipe; the liquid inlet main pipe is connected to the upper liquid port of the digester 1 through the valve B;

The respective liquid outlets of the white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all connected to the pumping main pipe through the liquid outlet valve 19, and the main interface of the pumping liquid main pipe passes through the slurry filter 21 in sequence , the liquid medicine pump 7 and the flow meter 9 are connected to the lower liquid port of the digester 1;

A valve C, a heating rod 8 and a circulation pump 6 are sequentially arranged on the pipelines of the upper liquid port and the lower liquid port of the digester 1;

The inner bottom of the digester 1 is equipped with a liquid distribution plate 102, and the top is equipped with a liquid distribution umbrella 103;

The bottom and top of the inner bucket 101 of the digester 1 are equipped with detachable slotted sieve plates 104 .

The DCS operating system 11 displays in real time the liquid levels, temperatures, and pressures of the digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4 and the washing liquid tank 5, and controls the liquid medicine pump 7 and the circulation pump 6 and the switch of heating rod 8.

A pressure sensor 15, a safety valve 14 and an emptying valve 17 are installed on the tops of the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5.

A liquid level sensor 12 and a temperature sensor 13 are installed on the sides of the digester 1 , the hot white liquor tank 2 , the hot black liquor tank 3 , the warm black liquor tank 4 and the washing liquid tank 5 .

A drain valve 20 is installed at the bottom of the hot white liquor tank 2, hot black liquor tank 3, warm black liquor tank 4 and washing liquid tank 5.

The liquid level sensor 12 is a magnetic flap type liquid level sensor; the temperature sensor 13 is a platinum resistance stainless steel temperature sensor.

The digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all made of duplex stainless steel.

The outer walls of the digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all covered with an insulating layer.

The circulating pump 6 is a duplex stainless steel magnetic pump.

The flowmeter 9 is an ultrasonic flowmeter; the steam generator 10 is an electric heating steam generator; the heating rod 8 has an anti-dry protection system.

The method for preparing chemical pulp or dissolving pulp by the above-mentioned experimental displacement cooking device is as follows:

Preparation of chemical pulp

(1) Preparation stage: start the steam generator 10 to generate steam, then open the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, the steam valve 18 on the top of the washing liquid tank 5, feed steam, and The temperature of the liquid medicine in the hot white liquid tank 2 is raised to 160°C, the temperature of the liquid medicine in the hot black liquid tank 3 is raised to 160°C, the temperature of the liquid medicine in the warm black liquid tank 4 is raised to 120°C, and the temperature of the liquid medicine in the washing liquid tank 5 is raised to 70°C ℃;

(2) Pot loading: take out the inner barrel 101 of the cooking device 1, select the corresponding sieve plate 104 according to the characteristics of the raw materials, add about 600g of absolute dry raw materials and install the upper sieve plate 104, put the inner barrel 101 with the raw materials Put it in the cooking device 1, and install the liquid cloth umbrella 103, and then install the pot cover 105;

(3) Pre-steaming: open the steam valve on the upper part of the digester 1, feed steam, heat to about 100°C, and remove the air in the raw material;

(4) Warm filling: pump about 4L of warm black liquor and 2L of hot white liquor to fill the digester 1, then feed steam into the digester 1, heat to 120°C, turn on the circulation pump 6 and heating rod 8, set to In the automatic heating state, when the temperature in the digester 1 is lower than the preset value, the heating rod 8 will be automatically heated to keep the digester 1 warm for 30 minutes;

(5) Hot charging: pump about 4L hot black liquor and 2L hot white liquor into digester 1, replace the original black liquor in digester 1 from the upper part of digester 1 and send it to warm black liquor tank 4, keep pumping The flow is consistent with the displaced flow;

(6) Heating up: After hot charging, steam is introduced into the cooking pot 1 to raise the temperature to 160°C, and the temperature is kept for 60 minutes, or the reaction is terminated according to the H factor calculated on the DCS operating system 11, and the circulation pump 6 and the heating rod 8 are turned on at the same time, and set In the automatic heating state, when the temperature in the cooking pot 1 is lower than the preset value, the heating rod will work automatically;

(7) Displacement washing: After the cooking is terminated, pump a certain amount of about 6L of washing liquid into the digester 1, and the replaced black liquor with a higher temperature (120-160°C) first enters the hot black liquor tank 3 with a lower temperature (<120°C) black liquor enters the warm black liquor tank 4;

(8) Unloading: the remaining gas in the digester 1 is discharged, and when the pressure drops to 0Pa, the pot cover 105 of the digester 1 is removed to take out the mixture in the digester 1;

The preparation steps of dissolving slurry are as follows:

(1) Preparation stage: start the steam generator 10 to generate steam, then open the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, the steam valve 18 on the top of the washing liquid tank 5, feed steam, and The temperature of the medicinal solution in the white liquor tank 2 is raised to 160°C, the temperature of the medicinal liquor in the hot black liquor bath 3 is raised to 160°C, the temperature of the medicinal liquor in the warm black liquor bath 4 is raised to 120°C, and the temperature of the medicinal liquor in the washing liquor tank 5 is raised to 70°C;

(2) Pot loading: take out the inner barrel 101 inside the digester 1, select the corresponding sieve plate 104 according to the characteristics of the raw materials, add 600g of absolute dry raw materials and install the upper sieve plate 104, put the inner barrel 101 with the raw materials Put it in the cooking device 1, and install the liquid cloth umbrella 103, and then install the pot cover 105;

(3) Pre-steaming: open the steam valve 18 on the upper part of the digester 1, feed steam, heat to about 160°C, keep warm for 1h, or determine the reaction termination according to the P factor calculated on the DCS operating system 11;

(4) Neutralization reaction: pump about 2L of hot black liquor and 2L of hot white liquor into digester 1, and turn on circulation pump 6 to circulate for 10 minutes;

(5) Hot charging: pump about 4L hot black liquor and 2L hot white liquor into digester 1, replace the original black liquor in digester 1 from the upper part of digester 1 and send it to warm black liquor tank 4, keep pumping The flow is consistent with the displaced flow;

(6) Heating up: After hot charging, steam is introduced into the cooking pot 1 to raise the temperature to 160°C, and the temperature is kept for about 60 minutes, or the reaction is terminated according to the H factor calculated on the DCS operating system 11, and the circulation pump 6 and the heating rod 8 are turned on at the same time. Set to the automatic heating state, when the temperature in the pot is lower than the preset value, the heating rod will work automatically;

(7) Replacement washing: After the cooking is terminated, pump a certain amount (about 6L) of washing liquid into the digester 1, and the replaced black liquor with a higher temperature (120-160°C) first enters the hot black liquor tank 3, the temperature The lower (<120°C) black liquor enters the warm black liquor tank 4;

(8) Unloading: discharge the remaining gas in the digester 1, and when the pressure drops to 0 Pa, remove the pot cover 105 to take out the mixture in the digester 1.

Compared with the prior art, the present invention has the following advantages and effects:

The experimental displacement cooking device of the present invention is designed according to the principle of displacement cooking, through four displacement tanks (hot white liquor tank 2, hot black liquor tank 3, warm black liquor tank 4, washing liquid tank 5), to achieve different temperatures For the replacement of black liquor, each replacement tank can be fed with steam to heat the liquid medicine. Ultrasonic flowmeters and magnetic flap flowmeters can accurately reflect the flow rate and liquid level under high temperature and high pressure.

The technical means of the invention is simple and easy to implement, the structure is reasonable, and the use is convenient. The liquid distribution device and the sieve plate are used, which is beneficial to the uniform distribution of the liquid medicine, and can perform displacement and cooking simulation on any raw material. In addition, it can also be used as a conventional vertical circulation cooking pot, and can also be used for pre-steaming and pre-hydrolysis experiments.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a schematic diagram of the structure of the digester.

Figure 3 is a schematic diagram of the structure of the liquid distribution plate.

Fig. 4 is a schematic diagram of the section A-A in Fig. 3 .

Fig. 5 is a structural schematic diagram of the liquid distribution umbrella.

Fig. 6 is a structural schematic diagram of another view of the liquid distribution umbrella.

Fig. 7 is a schematic diagram of the structure of the sieve plate.

The corresponding names of each number in the figure are: 1-digester; 2-hot white liquor tank; 3-warm black liquor tank; 4-hot black liquor tank; 5-washing liquid tank; 6-circulation pump; ;8-heating rod; 9-flow meter; 10-steam generator; 11-DCS operating system; 12-liquid level sensor; 13-temperature sensor; 14-pressure sensor; 15-safety valve; 16-inlet valve; 17-empty valve; 18-steam valve; 19-liquid outlet valve; 20-drainage valve; 21-sludge filter; 101-inner barrel; 102-liquid distribution plate; Liquid umbrella; 1031-cloth liquid umbrella hole; 1032-thread; 104-sieve plate; 1041-sieve seam; 105 pot cover.

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figure 1-6. An experimental displacement cooking device of the present invention comprises a cooker 1, a hot white liquor tank 2, a hot black liquor tank 3, a warm black liquor tank 4, a washing liquid tank 5, a steam generator 10, and a DCS operating system 11;

The upper liquid port of the digester 1 is communicated with the steam generator 10 through the steam main pipe; the interface end of the steam main pipe and the upper liquid port of the digester 1 is provided with a valve A, and the interface end of the steam main pipe and the steam generator 10 is provided with a valve D ;

The respective liquid inlets of the hot white liquid tank 2, the hot black liquid tank 3, the warm black liquid tank 4, and the washing liquid tank 5 have two interfaces, one of which is connected to the liquid inlet main pipe through the liquid inlet valve 16, and the other interface is connected to the main liquid inlet through the liquid inlet valve 16. The steam valve 18 is connected to the steam main pipe; the liquid inlet main pipe is connected to the upper liquid port of the digester 1 through the valve B;

The respective liquid outlets of the white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all connected to the pumping main pipe through the liquid outlet valve 19, and the main interface of the pumping liquid main pipe passes through the slurry filter 21 in sequence , the liquid medicine pump 7 and the flow meter 9 are connected to the lower liquid port of the digester 1;

A valve C, a heating rod 8 and a circulation pump 6 are sequentially arranged on the pipelines of the upper liquid port and the lower liquid port of the digester 1;

The inner bottom of the digester 1 is equipped with a liquid distribution plate 102, and the top is equipped with a liquid distribution umbrella 103;

The bottom and top of the inner bucket 101 of the digester 1 are equipped with detachable slotted sieve plates 104 .

The DCS operating system 11 displays in real time the liquid levels, temperatures, and pressures of the digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4 and the washing liquid tank 5, and controls the liquid medicine pump 7 and the circulation pump 6 and the switch of heating rod 8.

A pressure sensor 15, a safety valve 14 and an emptying valve 17 are installed on the tops of the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5.

A liquid level sensor 12 and a temperature sensor 13 are installed on the sides of the digester 1 , the hot white liquor tank 2 , the hot black liquor tank 3 , the warm black liquor tank 4 and the washing liquid tank 5 .

A drain valve 20 is installed at the bottom of the hot white liquor tank 2, hot black liquor tank 3, warm black liquor tank 4 and washing liquid tank 5.

The liquid level sensor 12 is a magnetic flap type liquid level sensor; the temperature sensor 13 is a platinum resistance stainless steel temperature sensor.

The digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all made of duplex stainless steel.

The outer walls of the digester 1, the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, and the washing liquid tank 5 are all covered with an insulating layer.

The circulating pump 6 is a duplex stainless steel magnetic pump.

The flowmeter 9 is an ultrasonic flowmeter; the steam generator 10 is an electric heating steam generator; the heating rod 8 has an anti-dry protection system.

The method for preparing chemical pulp or dissolving pulp by using the above-mentioned experimental displacement cooking device can be realized through the following steps:

The steps of chemical pulp preparation (conventional displacement cooking preparation) are as follows:

(1) Preparation stage: start the steam generator 10 to generate steam, then open the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, the steam valve 18 on the top of the washing liquid tank 5, feed steam, and The temperature of the liquid medicine in the hot white liquid tank 2 is raised to 160°C, the temperature of the liquid medicine in the hot black liquid tank 3 is raised to 160°C, the temperature of the liquid medicine in the warm black liquid tank 4 is raised to 120°C, and the temperature of the liquid medicine in the washing liquid tank 5 is raised to 70°C ℃;

(2) Pot loading: take out the inner barrel 101 of the digester 1, select the corresponding sieve plate 104 according to the characteristics of the raw material, add about 600g of absolute dry raw material (different depending on the quality of the raw material) and install the upper sieve plate 104, put The inner barrel 101 with raw materials is put into the cooking device 1, and the liquid cloth umbrella 103 is installed, and then the pot cover 105 is installed;

(3) Pre-steaming: open the steam valve on the upper part of the digester 1, feed steam, heat to about 100°C, and remove the air in the raw material;

(4) Warm filling: pump about 4L of warm black liquor and 2L of hot white liquor to fill the digester 1, then feed steam into the digester 1, heat to 120°C, turn on the circulation pump 6 and heating rod 8, set to In the automatic heating state, when the temperature in the digester 1 is lower than the preset value, the heating rod 8 will be automatically heated to keep the digester 1 warm for 30 minutes;

(5) Hot charging: pump about 4L hot black liquor and 2L hot white liquor into digester 1, replace the original black liquor in digester 1 from the upper part of digester 1 and send it to warm black liquor tank 4, keep pumping The flow is consistent with the displaced flow;

(6) Heating up: After hot charging, steam is introduced into the cooking pot 1 to raise the temperature to 160°C, and the temperature is kept for about 60 minutes, or the reaction is terminated according to the H factor calculated on the DCS operating system 11, and the circulation pump 6 and the heating rod 8 are turned on at the same time. Set it to the automatic heating state, when the temperature in the cooking pot 1 is lower than the preset value, the heating rod will work automatically; during the cooking process, you can open the vent valve on the pot cover of the cooking pot 1 to deflate for about 10 minutes.

(7) Replacement washing: After the cooking is terminated, pump a certain amount (about 6L) of washing liquid into the digester 1, and the replaced black liquor with a higher temperature (120-160°C) first enters the hot black liquor tank 3, the temperature The lower (<120°C) black liquor enters the warm black liquor tank 4;

(8) Unloading: the remaining gas in the digester 1 is discharged, and when the pressure drops to 0Pa, the pot cover 105 of the digester 1 is removed to take out the mixture in the digester 1;

The preparation of dissolving pulp (pre-hydrolysis displacement cooking) steps are as follows:

(1) Preparation stage: start the steam generator 10 to generate steam, then open the hot white liquor tank 2, the hot black liquor tank 3, the warm black liquor tank 4, the steam valve 18 on the top of the washing liquid tank 5, feed steam, and The temperature of the medicinal solution in the white liquor tank 2 is raised to 160°C, the temperature of the medicinal liquor in the hot black liquor bath 3 is raised to 160°C, the temperature of the medicinal liquor in the warm black liquor bath 4 is raised to 120°C, and the temperature of the medicinal liquor in the washing liquor tank 5 is raised to 70°C;

(2) Pot loading: take out the inner barrel 101 of the digester 1, select the corresponding sieve plate 104 according to the characteristics of the raw material, add about 600g of absolute dry raw material (depending on the quality of the raw material) and install the upper sieve plate 104, Put the inner barrel 101 with raw materials into the cooker 1, and install the liquid cloth umbrella 103, and then install the pot cover 105;

(3) Pre-steaming: open the steam valve 18 on the upper part of the digester 1, feed steam, heat to about 160° C., and keep warm for 1 hour; or determine the termination of the reaction according to the P factor calculated on the DCS operating system 11;

(4) Neutralization reaction: pump about 2L of hot black liquor and 2L of hot white liquor into digester 1, and turn on circulation pump 6 to circulate for 10 minutes;

(5) Hot charging: pump about 4L hot black liquor and 2L hot white liquor into digester 1, replace the original black liquor in digester 1 from the upper part of digester 1 and send it to warm black liquor tank 4, keep pumping The flow is consistent with the displaced flow;

(6) Heating up: After hot charging, steam is introduced into the cooking pot 1 to raise the temperature to 160°C, and the temperature is kept for about 60 minutes, or the reaction is terminated according to the H factor calculated on the DCS operating system 11, and the circulation pump 6 and the heating rod 8 are turned on at the same time. Set it to the automatic heating state, when the temperature in the pot is lower than the preset value, the heating rod will work automatically; during the cooking process, you can open the vent valve on the pot cover of the steamer 1 to deflate for about 10 minutes.

(7) Replacement washing: After the cooking is terminated, pump a certain amount (about 6L) of washing liquid into the digester 1, and the replaced black liquor with a higher temperature (120-160°C) first enters the hot black liquor tank 3, the temperature The lower (<120°C) black liquor enters the warm black liquor tank 4;

(8) Unloading: discharge the remaining gas in the digester 1, and when the pressure drops to 0 Pa, remove the pot cover 105 to take out the mixture in the digester 1.

Conventional cooking experiment:

(1) Pot loading: take out the inner barrel 101 inside the digester 1, select the corresponding sieve plate 104 according to the characteristics of the raw material, add about 600g of absolute dry raw material (depending on the quality of the raw material) and install the upper sieve plate 104, The inner bucket 101 that raw material is housed is put into steamer 1, and cloth liquid umbrella 103 is installed, and pot cover 105 is installed then. At the same time, add the required cooking liquid according to the process requirements.

(2) Cooking: Turn on the circulating pump 6 and the heating rod 8, set the heating time on the DCS operating system 11, the small deflation time, and the heat preservation time, such as using eucalyptus as raw material, heat up 160°C for 1h, and small deflation for 10min, 160 ℃ insulation 1.5h.

(3) Unloading: after the cooking is finished, the gas in the digester 1 is discharged, and when the pressure drops to 0Pa, the pot cover 105 is removed to take out the mixture in the digester 1 .

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (10)

1. a test-type displacement cooking device, including boiling vessel (1), hot white liquor groove (2), hot black liquor Groove (3), temperature black liquor slot (4), washing liquid bath (5), steam generator (10), DCS operating system (11), it is characterised in that:

The top liquid mouth of boiling vessel (1) is connected by main steam range between steam generator (10)；Steam Vapour house steward is provided with valve A, main steam range and steam generator with the interface end of boiling vessel (1) top liquid mouth (10) interface end is provided with valve D；

Hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4), washing each the entering of liquid bath (5) Liquid mouth has two interfaces, and one of them interface connects feed liquor house steward by liquid feed valve (16), another Interface connects main steam range by steam valve (18)；Feed liquor house steward is by valve B connection boiling vessel (1) Top liquid mouth；

Hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4), washing each the going out of liquid bath (5) Liquid mouth all connects drawing liquid house steward by liquid valve (19), and total interface of drawing liquid house steward passes sequentially through screenings mistake The bottom liquid mouth of filter (21), spray pump (7), effusion meter (9) connection boiling vessel (1)；

Be sequentially provided with on the top liquid mouth of boiling vessel (1) and the pipeline of bottom liquid mouth valve C, heating rod (8), Circulating pump (6)；

The inner bottom part of boiling vessel (1) is equipped with liquid distribution plate (102), and top is equipped with liquid distributing umbrella (103)；

Bucket (101) bottom of boiling vessel (1) and top are equipped with dismountable seam type sieve plate (104)；

Described DCS operating system (11) shows boiling vessel (1), hot white liquor groove (2), hot black liquor in real time Groove (3), temperature black liquor slot (4) and the liquid level of washing liquid bath (5), temperature, pressure also controls spray pump (7), circulating pump (6) and the switch of heating rod (8).

Test-type displacement cooking device the most according to claim 1, it is characterised in that: described hot white liquor Groove (2), hot black liquor groove (3), temperature black liquor slot (4), the top of washing liquid bath (5) are mounted on pressure Sensor (15), relief valve (14), exhaust-valve (17).

Test-type displacement cooking device the most according to claim 1, it is characterised in that: described boiling vessel (1), hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4) and the side of washing liquid bath (5) While be provided with liquid level sensor (12), temperature sensor (13).

4. according to test-type displacement cooking device according to any one of claims 1 to 3, it is characterised in that: Described hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4) and the bottom of washing liquid bath (5) Blowoff valve (20) is installed.

Test-type displacement cooking device the most according to claim 3, it is characterised in that: described liquid level passes Sensor (12) is magnetic turnover plate type liquid level sensor；Described temperature sensor (13) is platinum resistance rustless steel Temperature sensor.

Test-type displacement cooking device the most according to claim 4, it is characterised in that: described boiling vessel (1), hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4), washing liquid bath (5) material equal For two phase stainless steel.

Test-type displacement cooking device the most according to claim 4, it is characterised in that: described boiling vessel (1), hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4), washing liquid bath (5) outer wall is all It is surrounded by heat-insulation layer.

Test-type displacement cooking device the most according to claim 4, it is characterised in that: described circulating pump (6) it is two phase stainless steel magnetic drive pump.

Test-type displacement cooking device the most according to claim 4, it is characterised in that: described effusion meter (9) it is ultrasonic flowmeter；Described steam generator (10) is electric heating type steam generator；Institute State heating rod (8) and protect system with anti-dry.

10. use test-type displacement cooking device according to any one of claim 1 to 9 to prepare chemical pulp Method, it is characterised in that following steps:

The preparation process of chemical pulp is as follows:

(1) preparatory stage: start steam generator (10), produce steam, then open hot white liquor groove (2), hot black liquor groove (3), temperature black liquor slot (4), the steam valve (18) on washing liquid bath (5) top, It is passed through steam, the medicinal liquid in hot white liquor groove (2) is warming up to 160 DEG C, the medicinal liquid liter of hot black liquor groove (3) Temperature is to 160 DEG C, and the medicinal liquid of temperature black liquor slot (4) is warming up to 120 DEG C, and the medicinal liquid of washing liquid bath (5) heats up To 70 DEG C；

(2) dress pot: the bucket (101) of boiling vessel (1) is taken out, according to the feature selection phase of raw material The sieve plate (104) answered, adds 600g over dry raw material and installs top sieve plate (104), will be equipped with raw material Boiling vessel (1) put into by bucket (101), and installs liquid distributing umbrella (103), then installs pot cover (105)；

(3) presteaming: open the steam valve on boiling vessel (1) top, be passed through steam, be heated to 100 DEG C, Remove the air in raw material；

(4) temperature is filled: pumps into 4L temperature black liquor and 2L hot white liquor and boiling vessel (1) is full of, then to steaming Boiler is passed through steam in (1), is heated to 120 DEG C, ON cycle pump (6) and heating rod (8), arranges To automatic heated condition, when the temperature in boiling vessel (1) is less than preset value, heating rod (8) can be certainly Dynamic heating, makes boiling vessel (1) be incubated 30min；

(5) heat is filled: pump into 4L hot black liquor and the hot white liquor of 2L to boiling vessel (1), by boiling vessel (1) In original black liquor from boiling vessel (1) upper replacement go out send into temperature black liquor slot (4), keep pump into flow with The flow displaced is consistent；

(6) heat up: heat is passed through steam and is warming up to 160 DEG C in filling backward boiling vessel (1), be incubated 60min, Or determine reaction terminating, simultaneously ON cycle pump according to the upper H factor calculated of DCS operating system (11) And heating rod (8) (6), automatic heated condition is set to, when the temperature in boiling vessel (1) is less than pre- If during value, heating rod can work automatically；

(7) displacement washing: after steaming and decocting terminates, pumps into the cleaning mixture of 6L to boiling vessel (1), displaces The black liquor that temperature is 120-160 DEG C initially enters hot black liquor groove (3), and temperature is that <black liquor of 120 DEG C enters Enter temperature black liquor slot (4)；

(8) discharging: remaining gas in boiling vessel (1) is discharged, during until pressure reduces to 0Pa, The pot cover 105 unloading boiling vessel (1) takes out the mixture in boiling vessel (1).