A method and device for comprehensive utilization of heat energy recovery of pulp waste steam

Abstract

The present invention discloses a method and device for comprehensive utilization of waste heat energy recovery from pulp waste steam, including: (1) absorbing and storing heat energy in waste steam from pulp with an absorption energy storage unit to realize heat energy recovery from waste steam; (2) inputting hot water generated by the absorption energy storage unit after absorbing heat energy into a black liquor evaporation system provided with an evaporation unit and a steam balance unit, and stably conveying and distributing various levels of hot water flash steam to the black liquor evaporation system through the steam balance unit, and returning the hot water to the absorption energy storage unit after cooling; (3) condensing the waste gas generated by the absorption energy storage unit and the black liquor evaporation system into a condenser and then conveying it to a deodorization unit through a vacuum pump, and discharging the waste gas after deodorization into the atmosphere. The present invention can realize the comprehensive utilization of waste heat energy from pulp industry and discharge waste gas in compliance with the standards, which is not only green and environmentally friendly, but also can effectively save the production cost of enterprises.

Description

Technical Field

[0001] The invention belongs to the technical field of pulp production, and in particular relates to a method and a device for comprehensive utilization of heat energy recovery of waste steam from pulp. Background Art

[0002] Since pulp production uses a ball steamer as the cooking equipment, its advantages are that the raw materials and the liquid medicine are mixed evenly, the pulp quality is relatively uniform, the liquid ratio is small, the liquid medicine concentration is high, the cooking time can be shortened, and the equipment has a simple structure, a small size, and is easy to install and maintain. However, due to the large and small steam release of the ball steamer, which has the characteristics of large thermal energy, fast release speed, frequent release, and rich entrained materials, a large amount of cooking waste steam will be generated. Since the cooking waste steam contains impurities such as small fibers, methyl mercaptan, and hydrogen sulfide, if it is discharged directly, it will not only waste a lot of energy, but also seriously pollute the environment. The recovery and reuse of the cooking waste steam must be solved as soon as possible. Summary of the invention

[0003] The main purpose of the present invention is to provide a method and device for recovering and comprehensively utilizing heat energy of waste steam from pulp, so as to overcome the deficiencies existing in the prior art.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0005] The embodiment of the present invention provides a method for recovering and comprehensively utilizing heat energy from waste pulp steam, which comprises the following steps:

[0006] (1) The heat energy in the pulp waste steam is absorbed and stored by the absorption and energy storage unit to realize the recovery of the waste steam heat energy;

[0007] (2) The hot water generated by the absorption and energy storage unit after absorbing heat energy is input into a black liquor evaporation system provided with an evaporation unit and a steam balance unit, and the steam of various grades of hot water flash evaporation is stably transported and distributed to the black liquor evaporation system through the steam balance unit, and the hot water is returned to the absorption and energy storage unit after cooling;

[0008] (3) The waste gas generated by the absorption energy storage unit and the black liquor evaporation system is condensed by a condenser and then transported to the deodorization unit via a vacuum pump. The deodorized waste gas is discharged into the atmosphere.

[0009] Furthermore, step (1) specifically includes: firstly, the waste steam from the steam ball is buffered by gravity to separate impurities according to large and small steam release, and then the heat energy in the pulp waste steam is absorbed and stored by the absorption and energy storage unit to realize the recovery of waste steam heat energy.

[0010] Preferably, the large steam release temperature of the steam ball waste steam is above 170°C, and the small steam release temperature is above 140°C.

[0011] Preferably, the large and small steam releases of the spherical waste steam further contain any one or a combination of two or more of alkali liquor, black liquor and fluff.

[0012] Furthermore, step (3) comprises: firstly condensing the waste gas generated by the absorption energy storage unit and the black liquor evaporation system through a condenser, and then conveying it to the deodorization unit for the deodorization treatment.

[0013] Preferably, the condenser comprises a mixing condenser or a partitioning condenser.

[0014] Preferably, the deodorization treatment comprises chemical deodorization treatment or biological deodorization treatment; particularly preferably, the method comprises: using an oxidant to carry out the chemical deodorization treatment.

[0015] Particularly preferably, the oxidant includes any one of hydrogen peroxide, ozone, and hypochlorite, or a combination of two or more thereof.

[0016] The embodiment of the present invention further provides a pulp waste steam heat energy recovery and comprehensive utilization treatment device, which is mainly used in the aforementioned pulp waste steam heat energy recovery and comprehensive utilization treatment method, and comprises:

[0017] An absorption and storage unit, which is at least used to absorb and store the heat energy in the pulp waste steam to achieve the recovery of the waste steam heat energy;

[0018] A black liquor evaporation system, comprising an evaporation unit and a steam balance unit, at least for receiving hot water generated after the absorption energy storage unit absorbs heat energy, and flash evaporating and absorbing heat energy of the hot water;

[0019] The deodorizing unit is used at least to deodorize the waste gas generated by the absorption energy storage unit and the black liquor evaporation system.

[0020] Furthermore, the pulp waste steam heat energy recovery and comprehensive utilization processing device also includes a condensation processing unit, which is at least used to condense the waste gas generated by the absorption energy storage unit and the black liquor evaporation system.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The method and device for comprehensive utilization of heat recovery of waste steam from pulp of the present invention can achieve separation of fluff, pulp and black liquor by arranging a vector separator and a waste gas buffer tank, while increasing the production capacity of pellet pulp by more than 3%. In addition, a heat absorption tower is used for absorption, and the gas phase flow rate in the tower is controlled, and a temperature variable frequency control circulating pump is used in the tower to achieve rapid gas-liquid mass transfer, heat transfer and energy saving, achieving more than 85% efficient heat recovery, with effective energy saving, economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a pulp waste steam heat energy recovery and comprehensive utilization processing device in one embodiment of the present application.

[0025] Description of the accompanying drawings: 11, large steam release main pipe, 12, first cyclone separator, 13, first waste gas buffer tank, 14, pulp extraction pump, 15, pulp discharge pipe, 21, small steam release main pipe, 22, second cyclone separator, 23, second waste gas buffer tank, 24, black liquor extraction pump, 25, black liquor discharge pipe, 31, heat storage absorption tower, 32, first hot water buffer tank, 33, second hot water buffer tank, 41, first effect evaporator, 42, first effect balancer, 43, second effect evaporator, 4 4. Second-effect balancer, 45. Triple-effect evaporator, 46. Triple-effect balancer, 47. Fourth-effect evaporator, 48. Fourth-effect balancer, 49. Fifth-effect evaporator, 410. Fifth-effect balancer, 411. Circulation pump, 51. Condenser, 52. Vacuum pump, 61. Deodorization tower, 62. Wastewater pump, A. Low-pressure steam pipeline, B. Gas phase pipeline, C. Gas phase pipeline, D. Third hot water pipeline, E. Hot steam pipeline, F. Second hot water pipeline, G. First hot water pipeline, H. Waste gas pipeline. DETAILED DESCRIPTION

[0026] The present invention will be more fully understood through the following detailed description, which should be read in conjunction with the accompanying drawings. Detailed embodiments of the present invention are disclosed herein; however, it should be understood that the disclosed embodiments are only exemplary of the present invention, which can be embodied in various forms. Therefore, the specific functional details disclosed herein should not be interpreted as limiting, but only as the basis of the claims and as a representative basis for teaching those skilled in the art to adopt the present invention in different ways in virtually any appropriate detailed embodiment.

[0027] In view of the shortcomings of the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. It is mainly aimed at the problem that a large amount of cooking waste steam is directly discharged, which wastes a lot of energy and seriously pollutes the environment. By recycling and comprehensively utilizing the heat energy of pulp waste steam, at least 85% of the waste steam heat energy can be recovered. The technical solution, its implementation process and principle will be further explained as follows.

[0028] One aspect of an embodiment of the present invention provides a method for recovering and comprehensively utilizing heat energy from waste pulp steam, which comprises the following steps:

[0029] (1) The heat energy in the pulp waste steam is absorbed and stored by the absorption and energy storage unit to realize the recovery of the waste steam heat energy;

[0030] (2) The hot water generated by the absorption and energy storage unit after absorbing heat energy is input into a black liquor evaporation system provided with an evaporation unit and a steam balance unit, and the steam of various grades of hot water flash evaporation is stably transported and distributed to the black liquor evaporation system through the steam balance unit, and the hot water is returned to the absorption and energy storage unit after cooling;

[0031] (3) The waste gas generated by the absorption energy storage unit and the black liquor evaporation system is condensed by a condenser and then transported to the deodorization unit via a vacuum pump for the deodorization treatment. The waste gas after the deodorization treatment is discharged into the atmosphere.

[0032] In some preferred schemes of the embodiments of the present invention, step (1) specifically includes: firstly, the waste steam from the evaporator is buffered by gravity to separate impurities according to large and small steam release, and then the heat energy in the pulp waste steam is absorbed and stored by an absorption energy storage unit to realize the recovery of waste steam heat energy.

[0033] In some preferred embodiments, the large steam release temperature of the steam ball exhaust is above 170°C, and the small steam release temperature is above 140°C.

[0034] In some preferred embodiments, the large and small steam releases of the spherical waste steam further include any one or a combination of two or more of alkali liquor, black liquor, and fluff, but are not limited thereto.

[0035] In some more specific embodiments, step (1) specifically includes: the large steam release and small steam release of the steam ball exhaust are respectively transported to the cyclone separation unit through the main pipe for separation, and then enter the waste gas buffer tank for buffering, the pressure is reduced to 3±2KPa, and the temperature is reduced to 150-155°C. The buffered gas is respectively transported to the absorption energy storage unit, and heat exchange is carried out with the 50±5°C low-temperature water in the absorption energy storage unit, and then the generated 85±5°C hot water is stably transported to step (2).

[0036] In some preferred embodiments, the flow rate of the large and small steam releases of the steam from the spherical vaporizer through the main pipe is controlled at 8-10 m / s.

[0037] In some preferred schemes of the embodiments of the present invention, the method for recovering and comprehensively utilizing heat energy from waste steam from pulp further includes: conveying the pulp obtained by filtering the waste steam from the buffer evaporator with large steam release to a pulp evaporator discharge pipeline, and conveying the black liquor obtained by filtering the waste steam from the buffer evaporator with small steam release to a black liquor tank.

[0038] In some preferred embodiments, the empty tower flow rate in the absorption energy storage unit is set at 1-1.5 m / s, wherein the absorption energy storage unit can adopt a plate tower or a packed tower, but is not limited thereto.

[0039] In some preferred schemes of the embodiments of the present invention, the black liquor evaporation system in step (2) adopts an n-effect evaporation system, wherein n is any integer between 5 and 6, and the steam balance unit is set to the effect number n accordingly.

[0040] In some preferred embodiments, the absorption energy storage unit delivers hot water to be incorporated into a second-effect steam balance unit of a black liquor evaporation system.

[0041] In some preferred embodiments, the steam balance unit in the black liquor evaporation system adopts multi-stage vacuum flash evaporation, and the evaporation unit in the black liquor evaporation system can adopt any one of a plate evaporator or a shell and tube evaporator, but is not limited thereto.

[0042] In some preferred schemes of the embodiments of the present invention, step (3) includes: firstly condensing the waste gas generated by the absorption energy storage unit and the black liquor evaporation system through a condenser, and then transporting it to the deodorization unit through a vacuum pump for the deodorization treatment.

[0043] In some preferred embodiments, the condenser comprises a mixing condenser or a partitioning condenser.

[0044] In some preferred embodiments, the deodorization process may include chemical deodorization process or biological deodorization process, but is not limited thereto.

[0045] In some more specific embodiments, the method includes: using an oxidant to perform the chemical deodorization treatment.

[0046] In some preferred embodiments, the oxidant may include any one or a combination of two or more of hydrogen peroxide, ozone, hypochlorite, etc., but is not limited thereto.

[0047] The embodiment of the present invention further provides a pulp waste steam heat energy recovery and comprehensive utilization processing device, which is mainly used in the aforementioned pulp waste steam heat energy recovery and comprehensive utilization processing method, and comprises:

[0048] An absorption and storage unit, which is at least used to absorb and store the heat energy in the pulp waste steam to achieve the recovery of the waste steam heat energy;

[0049] A black liquor evaporation system, comprising an evaporation unit and a steam balance unit, at least for receiving hot water generated after the absorption energy storage unit absorbs heat energy, and flash evaporating the hot water and recovering heat energy;

[0050] The deodorizing unit is used at least to deodorize the waste gas generated by the absorption energy storage unit and the black liquor evaporation system.

[0051] In some preferred embodiments, the pulp waste steam heat energy recovery and comprehensive utilization processing device also includes a condensation processing unit, which is at least used to condense the waste gas generated by the absorption energy storage unit and the black liquor evaporation system.

[0052] The embodiment of the present invention can realize the comprehensive utilization of waste steam heat energy recovery of pulp, and at the same time increase the production capacity of pelletized pulp by 3%, recover 85% of waste steam heat energy, and effectively solve the odor problem in the pulp production process, with effective energy-saving, economic and environmental protection benefits.

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further explained below in conjunction with specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain the present invention, but the experimental conditions and setting parameters therein should not be regarded as limitations on the basic technical solutions of the present invention. And the protection scope of the present invention is not limited to the following embodiments. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Example 1

[0055] The pulp waste steam heat energy recovery and comprehensive utilization processing device of this embodiment is as follows: Figure 1As shown, it includes a pre-treatment system, an absorption energy storage unit, a black liquor evaporation system, a deodorization unit and a condensation treatment unit. Specifically, the pre-treatment system includes a large and small steam release treatment unit for spherical waste steam arranged in parallel, wherein the large steam release treatment unit for spherical waste steam includes a large steam release main pipe 11, a first cyclone separator 12, a first waste gas buffer tank 13, a pulp extraction pump 14 and a pulp discharge pipe 15 arranged in series in sequence; the small steam release treatment unit for spherical waste steam includes a small steam release main pipe 21, a second cyclone separator 22, a second waste gas buffer tank 23, a black liquor extraction pump 24 and a black liquor discharge pipe 25 arranged in series in sequence; the absorption energy storage unit includes a heat storage absorption tower 31, a first hot water buffer tank 3 2 and a second hot water buffer tank 33, the black liquor evaporation system adopts a five-effect evaporation system, specifically including a first-effect evaporator 41, a first-effect balancer 42 matched with the first-effect evaporator 41, a second-effect evaporator 43, a second-effect balancer 44 matched with the second-effect evaporator 43, a third-effect evaporator 45, a third-effect balancer 46 matched with the third-effect evaporator 45, a fourth-effect evaporator 47, a fourth-effect balancer 48 matched with the fourth-effect evaporator 47, a fifth-effect evaporator 49, and a fifth-effect balancer 410 matched with the fifth-effect evaporator 49, and the first-effect evaporator 41, the second-effect evaporator 43, the third-effect evaporator 45, the fourth-effect evaporator 47 and the fifth-effect evaporator 49 are all connected in series with a circulating pump 411; The condensation treatment unit includes a condenser 51 and a vacuum pump 52, and the deodorization unit includes a deodorization tower 61 and a wastewater pump 62; the low-pressure steam pipeline A passes through the first-effect evaporator 41, the second-effect evaporator 43, the third-effect evaporator 45, the fourth-effect evaporator 47, the fifth-effect evaporator 49, the condenser 51, the vacuum pump 52, the deodorization tower 61 and the wastewater pump 62 in sequence, and the heat storage absorption tower 31 is also connected to the condenser 51 through the exhaust gas pipeline H; the first exhaust gas buffer tank 13 and the second exhaust gas buffer tank 23 are connected to the heat storage absorption tower 31 through the gas phase pipeline B, respectively, and the first hot water buffer tank 32 is connected to the heat storage absorption tower 31 in series through the gas phase pipeline C. A hot water circulation pump 34 is also provided between the collecting towers 31, and the hot water circulation pump 34 is connected in series between the first hot water buffer tank 32 and the heat storage absorption tower 31 through the third hot water pipeline D, the water inlet end of the first hot water pipeline G is connected to the third hot water pipeline D, and the first hot water buffer tank 32 is connected to the second effect balancer 44 of the black liquor evaporation system through the first hot water pipeline G; the hot steam pipeline E passes through the first effect balancer 42, the second effect balancer 44, the third effect balancer 46, the fourth effect balancer 48 and the fifth effect balancer 410 in sequence, and the fifth effect balancer 410 is also connected to the heat storage absorption tower 31 through the second hot water pipeline F through the second hot water buffer tank 33 and the hot water circulation pump 35 in sequence.

[0056] Based on the pulp waste steam heat energy recovery and comprehensive utilization processing device of this embodiment, the pulp waste steam heat energy recovery and comprehensive utilization is carried out, and the specific steps are as follows:

[0057] (1) Waste steam heat recovery

[0058] 211.2t / d (equivalent to 8.8t / h) of spherical vapor is transported to the first cyclone separator 12 for separation and to the second cyclone separator 22 for separation through the large steam release main pipe 11 and the small steam release main pipe 21, respectively, according to large and small steam release. The large steam release temperature of the spherical vapor is 170°C, and the small steam release temperature is 140°C. The flow rate of the large and small steam releases through the main pipe is controlled at 10m / s. Then, the gas separated by the first cyclone separator 12 enters the first waste gas buffer tank 13 for buffering, and the gas separated by the second cyclone separator 22 enters the second waste gas buffer tank 23 for buffering. The pressure is reduced to 3KPa (G) and the temperature is reduced to 155°C. The buffered gas is filtered by a self-cleaning filter. The filtered gas phase enters the heat storage absorption tower 31 with a flow rate controlled at 1.5m / s. The packing layer in the heat storage absorption tower 31 is fully heat-exchanged with 50°C water.

[0059] (2) Comprehensive utilization of thermal energy

[0060] The 85°C hot water after absorbing heat in the heat storage absorption tower 31 is stably pumped out to the second-effect balancer 44 of the black liquor evaporation system for three-stage vacuum flash evaporation, and the hot water is flashed into 85°C, 75°C and 65°C steam respectively, and then enters the second, third and fourth evaporators of the five-effect evaporator respectively as a supplementary heat source, and the hot water returns to the heat storage absorption tower 31 after cooling. The pulp (3% of the single distillation ball yield) obtained by filtering the buffered large steam release is returned to the pulp system through the pulp extraction pump 14 and the pulp discharge pipe 15 in turn, and the black liquor obtained by filtering the buffered small steam release is transported to the black liquor system through the black liquor extraction pump 24 and the black liquor discharge pipe 25 in turn.

[0061] (3) Exhaust gas treatment

[0062] The waste gas generated by the heat storage absorption tower 31 and the black liquor evaporation system is condensed by the condenser 51 and then transported to the deodorization tower 61 of the deodorization unit through the vacuum pump 52 for deodorization. The deodorization tower 61 adopts sodium hypochlorite oxidation deodorization method. After treatment, it can meet the "Emission Standard of Odor Pollutants" GB14554-1993 and be discharged into the atmosphere.

[0063] Through the treatment of the pellet waste steam in this embodiment, the pellet pulp production capacity is increased by 3% and the waste steam heat energy is recovered by 85%.

[0064] Example 2

[0065] This embodiment is basically the same as the embodiment 1, but the black liquor evaporation system in step 2) comprehensive utilization of heat energy adopts a six-effect evaporation system. In this way, the production capacity of the pelletized pulp is increased by 3%, and the waste steam heat energy is recovered by 90%.

[0066] Comparison Example

[0067] This embodiment is basically the same as the embodiment 1, but the black liquor evaporation system in step 2) comprehensive utilization of heat energy adopts a four-effect evaporation system. In this way, the production capacity of the pelletized pulp is increased by 3%, and the waste steam heat energy is recovered by 80%.

[0068] The various aspects, embodiments, features and examples of the present invention should be considered as illustrative in all aspects and are not intended to limit the present invention, the scope of the present invention is defined only by the claims. Other embodiments, modifications and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0069] The use of headings and sections in this disclosure is not meant to limit the disclosure; each section may apply to any aspect, embodiment, or feature of the disclosure.

[0070] Throughout this disclosure, where a composition is described as having, containing, or comprising particular components, or where a process is described as having, containing, or comprising particular process steps, it is contemplated that the compositions taught by the present invention also consist essentially of or consist of the recited components, and that the processes taught by the present invention also consist essentially of or consist of the recited process steps.

[0071] Unless specifically stated otherwise, use of the terms "include," "includes," "including," "have," "has," or "having" should generally be construed as open ended and non-limiting.

[0072] It should be understood that the order of the various steps or the order in which the specific actions are performed is not very important, as long as the teachings of the present invention remain operable. In addition, two or more steps or actions may be performed simultaneously.

[0073] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments with other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0074] Although the present invention has been described with reference to illustrative embodiments, it will be appreciated by those skilled in the art that various other changes, omissions and / or additions may be made without departing from the spirit and scope of the present invention and that the elements of the embodiments may be replaced by substantial equivalents. In addition, many modifications may be made without departing from the scope of the present invention to adapt specific circumstances or materials to the teachings of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for performing the present invention, but it is intended that the present invention will include all embodiments within the scope of the appended claims. In addition, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but rather uses the terms first, second, etc. to distinguish one element from another.

Claims

1. A method for recovering and comprehensively utilizing heat energy from waste pulp steam, characterized in that The steps include: (1) First, the waste steam from the steam spherical is buffered and separated by gravity according to large and small steam release, and then the heat energy in the waste steam from the pulp is absorbed and stored by the absorption and energy storage unit to realize the recovery of the waste steam heat energy; (2) The hot water generated by the absorption energy storage unit after absorbing the heat energy is input into the black liquor evaporation system provided with the evaporation unit and the steam balance unit, and the steam of various grades of hot water flash evaporation is stably transported and distributed to the black liquor evaporation system through the steam balance unit, and the hot water is returned to the absorption energy storage unit after cooling; (3) The waste gas generated by the absorption energy storage unit and the black liquor evaporation system enters the condenser for condensation and is then transported to the deodorization unit via a vacuum pump. The deodorized waste gas is discharged into the atmosphere; Wherein, step (1) specifically comprises: the large steam release and the small steam release of the spherical vapor are respectively transported to the cyclone separation unit through the main pipe for separation, and then enter the waste gas buffer tank for buffering, the pressure is reduced to 3±2KPa, and the temperature is reduced to 150-155°C, and the buffered gas is respectively transported to the absorption energy storage unit, and heat exchange is performed with the 50±5°C low-temperature water in the absorption energy storage unit, and then the generated 85±5°C hot water is stably transported to step (2); and the pulp obtained by filtering the large steam release of the buffered spherical vapor waste steam is transported to the pulp spherical vapor discharge pipeline, and the black liquor obtained by filtering the small steam release of the buffered spherical vapor waste steam is transported to the black liquor storage tank; In the step (2), the black liquor evaporation system adopts an n-effect evaporation system, wherein n is any integer between 5 and 6, and the steam balance unit is set with the effect number n accordingly.

2. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The large steam release temperature of the steam from the steam spherical is above 170°C, and the small steam release temperature is above 140°C.

3. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The large and small released steam of the steam spherical waste steam also contain any one or a combination of two or more of alkali liquor, black liquor and fluff.

4. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The flow rate of the large and small steam releases of the steam from the spherical distillation vessel through the main pipe is controlled to be below 8-10m / s.

5. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The empty tower flow rate in the absorption energy storage unit is set at 1-1.5 m / s, and / or the absorption energy storage unit adopts a plate tower or a packed tower.

6. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The absorption energy storage unit transports hot water and is incorporated into the second-effect steam balance unit of the black liquor evaporation system.

7. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The steam balance unit in the black liquor evaporation system adopts multi-stage flash evaporation, and / or the evaporation unit in the black liquor evaporation system adopts any one of a plate evaporator and a tube-in-tube evaporator.

8. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The condenser includes a mixing condenser or a partitioning condenser.

9. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 1, characterized in that: The deodorization treatment includes chemical deodorization treatment or biological deodorization treatment.

10. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 9, characterized in that: The chemical deodorization treatment is carried out using an oxidizing agent.

11. The method for recovering and comprehensively utilizing heat energy from waste pulp steam according to claim 10, characterized in that: The oxidant includes any one of hydrogen peroxide, ozone, and hypochlorite, or a combination of two or more thereof.

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