阅读说明：本技术 联碱生产用节能装置 (Energy-saving device for combined alkali production ) 是由 汤广斌 甘世杰 刘旭 高卫星 邓占听 王伟 王振 于 2018-08-20 设计创作，主要内容包括：本发明涉及联碱生产用设备技术领域,尤其涉及联碱生产用节能装置,包括煅烧炉、蒸汽制备装置和储水槽,其中,所述蒸汽制备装置为三级蒸汽制备装置,所述三级蒸汽制备装置分别为第一级闪发器、第二级闪发器和第三级闪发器；所述煅烧炉和所述储水槽分别与所述第一级闪发器相连接,所述第二级闪发器与所述储水槽相连接,所述第三级闪发器与所述第二级闪发器相连接。与现有技术相比,本发明充分利用现有联碱生产设备,基于现有联碱生产的生产工艺进行优化设计,对冷凝液进行多级处理,实现对联碱生产过程中煅烧炉的冷凝液的高效回收和再利用,节约能耗,能够有效提高生产的稳定性,为产品质量提供保障,适合大规模推广应用。(The invention relates to the technical field of equipment for combined soda production, in particular to an energy-saving device for combined soda production, which comprises a calcining furnace, a steam preparation device and a water storage tank, wherein the steam preparation device is a three-level steam preparation device, and the three-level steam preparation device is respectively a first-level flash tank, a second-level flash tank and a third-level flash tank; the calcinator and the water storage tank are respectively connected with the first-stage flash tank, the second-stage flash tank is connected with the water storage tank, and the third-stage flash tank is connected with the second-stage flash tank. Compared with the prior art, the invention fully utilizes the existing combined soda production equipment, carries out optimized design based on the existing production process of combined soda production, carries out multi-stage treatment on the condensate, realizes the high-efficiency recovery and reutilization of the condensate of the calcining furnace in the combined soda production process, saves energy consumption, can effectively improve the production stability, provides guarantee for the product quality, and is suitable for large-scale popularization and application.)

1. The energy-saving device for the combined soda production comprises a calcining furnace, a steam preparation device and a water storage tank, and is characterized in that: the steam preparation device is a three-stage steam preparation device which is respectively a first-stage flash tank, a second-stage flash tank and a third-stage flash tank; the calcinator and the water storage tank are respectively connected with the first-stage flash tank, the second-stage flash tank is connected with the water storage tank, and the third-stage flash tank is connected with the second-stage flash tank.

2. The energy-saving device for the combined alkali production according to claim 1, characterized in that: the lower part of the first-stage flash tank is connected with the upper part of the water storage tank, the bottom and the middle part of the water storage tank are respectively connected with the upper part of the second-stage flash tank, and the lower part of the second-stage flash tank is connected with the upper part of the third-stage flash tank.

3. The energy-saving device for the combined alkali production according to claim 2, characterized in that: the first-stage flash tank is connected with the water storage tank through a first-stage steam condensate conveying pipeline, and a group of control valves are arranged on the first-stage steam condensate conveying pipeline; the water storage tank and the second-stage flash tank are connected through a mixed condensate conveying pipeline, the two groups of mixed condensate conveying pipelines are respectively a first mixed condensate conveying pipeline and a second mixed condensate conveying pipeline, the first mixed condensate conveying pipeline is connected with the middle of the water storage tank and the upper part of the second-stage flash tank, the second mixed condensate conveying pipeline is connected with the bottom of the water storage tank and the upper part of the second-stage flash tank, and five groups of control valves are arranged on the two groups of furnace gas condensate conveying pipelines; the second-stage flash tank and the third-stage flash tank are connected through a second-stage steam condensate conveying pipeline, and four groups of control valves are arranged on the second-stage steam condensate conveying pipeline.

4. The energy-saving device for the combined alkali production according to claim 2, characterized in that: the third-level flash evaporator is connected with the boiler deaerator through a third-level steam condensate conveying pipeline, the third-level steam condensate conveying pipeline is two groups, the two groups of third-level steam condensate conveying pipelines are respectively an upper third-level steam condensate conveying pipeline and a lower third-level steam condensate conveying pipeline, the upper third-level steam condensate conveying pipeline is connected with the upper portion of the second-level flash evaporator and the boiler deaerator, the lower third-level steam condensate conveying pipeline is connected with the lower portion of the second-level flash evaporator and the boiler deaerator, and five groups of control valves are arranged on the two groups of third-level steam condensate conveying pipelines.

5. The energy-saving device for the combined alkali production according to claim 2, characterized in that: the top of first order flash tank, second level flash tank and third level flash tank all is equipped with the steam discharge port, first order flash tank, second level flash tank and third level flash tank are equallyd divide and are connected with the steam main pipeline respectively.

6. The energy-saving device for combined alkali production according to any one of claims 1 to 5, characterized in that: the three-stage steam preparation device is used for preparing steam with the temperature of 110-220 ℃.

7. The energy-saving device for combined alkali production according to any one of claims 1 to 5, characterized in that: the three-stage steam preparation device is used for preparing steam of 0.4 MPa-3.2 MPa.

8. The energy-saving device for combined alkali production according to any one of claims 1 to 5, characterized in that: the first-stage flash tank is used for supplying heat to the light liquid distillation device, the second-stage flash tank is used for supplying heat to the heavy ash calcining furnace or the dry ammonium boiling furnace, and the third-stage flash tank is used for supplying heat to a calcining furnace gas system or a dry ammonium air heater.

9. The energy-saving device for combined alkali production according to any one of claims 1 to 5, characterized in that: the first stage flash tank is used for preparing 3.2MPa steam, the second stage flash tank is used for preparing 1.6MPa steam, and the third stage flash tank is used for preparing 0.4MPa steam.

10. The energy-saving device for combined alkali production according to any one of claims 1 to 5, characterized in that: the second stage flash tank controls the temperature and pressure of the steam produced by the second stage flash tank by controlling the level of condensate in the second stage flash tank.

Technical Field

The invention relates to the technical field of equipment for combined alkali production, in particular to an energy-saving device for combined alkali production.

Background

At present, in the field of combined soda production (combined soda production, which is a main method for producing soda), condensate of a calcining furnace is generally subjected to steam preparation and supplied to a dilute liquid distillation device for use. The prepared steam is mainly 3.2MPa steam, and is indirectly contacted with the heavy alkali in the calcining furnace to promote the decomposition reaction of the heavy alkali to generate the soda ash, a large amount of steam is condensed into water during the decomposition reaction, and condensed water enters the water storage tank along the heating pipe, so that the condensed water enters the waste weak liquor system in a large amount, the condensed water cannot smoothly enter the water storage tank, the production capacity of the calcining furnace is seriously influenced, and the stability and the quality of product production are influenced.

Therefore, research and development of equipment for combined alkali production aiming at condensate utilization are urgently needed, energy consumption is saved, and production stability and product quality are improved.

Disclosure of Invention

The invention aims to provide an energy-saving device for combined soda production, which is improved based on the existing combined soda production equipment and realizes the efficient recovery and reutilization of condensate of a calcining furnace in the combined soda production process, thereby improving the production stability, saving the energy consumption and providing guarantee for the product quality.

The technical scheme for solving the problems is as follows: the energy-saving device for the combined soda production comprises a calcining furnace, a steam preparation device and a water storage tank, wherein the steam preparation device is a three-level steam preparation device which is respectively a first-level flash tank, a second-level flash tank and a third-level flash tank; the calcinator and the water storage tank are respectively connected with the first-stage flash tank, the second-stage flash tank is connected with the water storage tank, and the third-stage flash tank is connected with the second-stage flash tank.

Further, in the energy-saving device for combined alkali production according to the present invention, the lower portion of the first stage flash tank is connected to the upper portion of the water storage tank, the bottom and the middle portion of the water storage tank are respectively connected to the upper portion of the second stage flash tank, and the lower portion of the second stage flash tank is connected to the upper portion of the third stage flash tank.

Preferably, in the energy-saving device for combined alkali production of the present invention, the first stage flash tank is connected to the water storage tank through a first stage steam condensate conveying pipe, and a group of control valves is arranged on the first stage steam condensate conveying pipe; the water storage tank and the second-stage flash tank are connected through a mixed condensate conveying pipeline, the two groups of mixed condensate conveying pipelines are respectively a first mixed condensate conveying pipeline and a second mixed condensate conveying pipeline, the first mixed condensate conveying pipeline is connected with the middle of the water storage tank and the upper part of the second-stage flash tank, the second mixed condensate conveying pipeline is connected with the bottom of the water storage tank and the upper part of the second-stage flash tank, and five groups of control valves are arranged on the two groups of furnace gas condensate conveying pipelines; the second-stage flash tank and the third-stage flash tank are connected through a second-stage steam condensate conveying pipeline, and four groups of control valves are arranged on the second-stage steam condensate conveying pipeline.

Preferably, in the energy-saving device for combined soda production according to the present invention, the third stage flash evaporator is connected to the boiler deaerator through third stage steam condensate conveying pipes, two sets of the third stage steam condensate conveying pipes are provided, the two sets of the third stage steam condensate conveying pipes are an upper third stage steam condensate conveying pipe and a lower third stage steam condensate conveying pipe, the upper third stage steam condensate conveying pipe is connected to the upper portion of the second stage flash evaporator and the boiler deaerator, the lower third stage steam condensate conveying pipe is connected to the lower portion of the second stage flash evaporator and the boiler deaerator, and five sets of control valves are provided on the two sets of the third stage steam condensate conveying pipes.

Preferably, in the energy-saving device for combined alkali production of the present invention, the top of each of the first stage flash tank, the second stage flash tank and the third stage flash tank is provided with a steam discharge port, and the first stage flash tank, the second stage flash tank and the third stage flash tank are respectively connected to a steam main pipeline.

Further, in the energy-saving device for combined soda production, the three-stage steam preparation device is used for preparing steam with the temperature of 110-220 ℃.

Further, in the energy-saving device for combined alkali production, the three-stage steam preparation device is used for preparing steam of 0.4-3.2 MPa.

Further, in the energy-saving device for combined soda production, the first-stage flash tank is used for supplying heat to the light liquid distillation device, the second-stage flash tank is used for supplying heat to the heavy ash calciner or the dry ammonium fluidized bed furnace, and the third-stage flash tank is used for preserving heat of a calciner gas system or supplying heat to a dry ammonium air heater.

Further, in the energy-saving device for combined alkali production, the first stage flash tank is used for preparing 3.2MPa of steam, the second stage flash tank is used for preparing 1.6MPa of steam, and the third stage flash tank is used for preparing 0.4MPa of steam.

Further, in the energy-saving device for combined soda production, the second-stage flash tank controls the temperature and the pressure of the steam prepared by the second-stage flash tank by controlling the liquid level of the condensate in the second-stage flash tank.

Compared with the prior art, the invention has the beneficial effects that: the existing combined soda production equipment is fully utilized, the optimized design is carried out based on the existing combined soda production process, the condensate is subjected to multi-stage treatment, the efficient recovery and reutilization of the condensate of the calcining furnace in the combined soda production process are realized, the energy consumption is saved, the production stability is effectively improved, the guarantee is provided for the product quality, and the combined soda production process is suitable for large-scale popularization and application.

Drawings

FIG. 1 is a schematic structural diagram of an energy-saving device for the combined alkali production of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the drawings and examples, but the present invention is not limited to the examples.

As shown in fig. 1, the energy-saving device for combined soda production comprises a calcinator, a steam preparation device and a water storage tank, wherein the steam preparation device is a three-stage steam preparation device, and the three-stage steam preparation device is a first-stage flash tank, a second-stage flash tank and a third-stage flash tank respectively; the calcinator and the water storage tank are respectively connected with the first-stage flash tank, the second-stage flash tank is connected with the water storage tank, and the third-stage flash tank is connected with the second-stage flash tank.

In the above embodiment, the three-level steam preparation device is arranged to recycle the condensate of the calciner in three levels, wherein the condensate of the calciner is subjected to primary flash evaporation through the first-level flash evaporator, the steam obtained from the primary flash evaporation is sent to the steam main pipeline to be redistributed or directly sent to the standby heat device, the steam condensate in the flash evaporator after the primary flash evaporation is sent to the water storage tank, the water storage tank is used for collecting the furnace gas condensate of the calciner and the steam condensate after the primary flash evaporation, the mixed condensate in the water storage tank is sent to the second-level flash evaporator to be subjected to secondary flash evaporation, the steam obtained from the secondary flash evaporation is sent to the steam main pipeline to be redistributed or directly sent to the standby heat device, the steam condensate in the flash evaporator after the secondary flash evaporation is sent to the third-level flash evaporator to be subjected to tertiary flash evaporation, and the steam obtained from the tertiary flash evaporation is sent to the steam main pipeline to be, and (4) inputting the steam condensate in the flash tank after the three-stage flash to a boiler deaerator for recycling. For each standby heat device, the devices in the combined soda production system, such as a calcining furnace gas system heat preservation device, a fresh liquor distillation system, a heavy ash calcining furnace, a dry ammonium boiling furnace and the like, preferably, the first-stage flash tank is used for supplying heat to the fresh liquor distillation device, the second-stage flash tank is used for supplying heat to the heavy ash calcining furnace or the dry ammonium boiling furnace, and the third-stage flash tank is used for supplying heat to the calcining furnace gas system heat preservation device or the dry ammonium air heater; because the 1.6MPa steam used by the heavy ash calcining furnace and the dry ammonium fluidized bed furnace is completely supplied by an external system in the existing combined soda production process, the arrangement and the application are favorable for reducing the requirement on an external heat supply system, and are favorable for avoiding the unstable production of the heavy ash and the dry ammonium caused by the insufficient steam supplied by the external system, thereby improving the production stability and simultaneously being favorable for improving the product quality. Preferably, in order to meet the heat consumption requirements of a dry ammonium fluidized bed furnace and the like, the three-stage steam preparation device is used for preparing 0.4-3.2 MPa steam, the first-stage flash evaporator is preferably used for preparing 3.2MPa steam, the second-stage flash evaporator is preferably used for preparing 1.6MPa steam, and the third-stage flash evaporator is preferably used for preparing 0.4MPa steam, so that the condensate is efficiently recycled and reused, correspondingly, heat is conveyed to system devices with different heat consumption requirements, and the production efficiency and stability of the combined alkali are guaranteed. Preferably, the three-stage steam preparation device is used for preparing steam with the temperature of 110-220 ℃ so as to ensure the full reuse of condensate and the heat requirement for related production.

In the embodiment, in order to effectively cooperate with the overall high-efficiency operation of the combined alkali production system and ensure the full recovery and reutilization of the condensate, the second-stage flash tank controls the temperature and the pressure of the prepared steam by controlling the liquid level of the condensate in the second-stage flash tank, so that the full automation and the automatic control of the pressure and the liquid level are realized.

In the embodiment, 3.2MPa steam is indirectly contacted with heavy alkali in the calcining furnace to ensure that a large amount of steam generated during the process of decomposing the heavy alkali into the calcined alkali is condensed into water and smoothly enters the water storage tank through three-level flash evaporation, so that the production capacity of the calcining furnace and the qualification rate of products are improved; and according to the fact that the places using 0.4MPa steam in the combined alkali production process are few, the calcining furnace gas system heat preservation, the fresh liquid distillation system, the dry ammonium air heater and the like are mainly used, and the steam used in the places is not too much, the invention is provided with the third-stage flash tank to carry out three-stage flash preparation, the production of 0.4MPa steam is greatly reduced relatively after the primary flash tank and the secondary flash tank, a large amount of energy consumption is saved, the conditions that the calcining furnace gas system heat preservation, the fresh liquid distillation system, the dry ammonium air heater and the like are used are met, meanwhile, the 0.4MPa steam overpressure is effectively avoided, the serious safety accident caused by overpressure is avoided, and the waste caused by the fact that a large amount of steam has to be discharged from the emptying is avoided. In addition, after the primary flash vaporization and the secondary flash vaporization, the steam condensate liquid generated by the tertiary flash vaporization in the tertiary flash vaporizer is greatly reduced, so that the steam condensate liquid brought in the 0.4MPa steam is also greatly reduced, and the phenomenon that the 0.4MPa steam carries water due to the full liquid level of the flash vaporizer is effectively avoided, so that the energy consumption is reduced, for example, when the flash 0.4MPa steam is used for a weak solution distillation device, because the weak solution distillation is generally direct heat, a large amount of condensate liquid enters a waste weak solution system, the temperature needs to be reduced after the weak solution distillation device is reused, and the energy consumption is increased.

In the embodiment, the calcined condensate can be utilized in a grading manner to save energy through the application of the invention, three-level flash vaporization is set according to the requirement of combined alkali production, the obtained three flash vaporization steam with gradient pressure reduction are effectively utilized, the gas-liquid retention time is increased, the condensate separation effect is improved, the steam quality of 1.6MPa is improved, the steam quality and the condensate quality of 0.4MPa are optimized, the condensate waste caused by direct heating is greatly reduced, the phenomena of steam containing much water and poor quality, condensate temperature and high entrained steam and the like which influence long-term stable operation are effectively avoided, the system operation stability is improved, and thus the production is ensured.

In some embodiments of the invention, in order to ensure full-automatic stable continuous operation of three-stage flash, the lower part of the first-stage flash tank is connected with the upper part of the water storage tank, the bottom and the middle part of the water storage tank are respectively connected with the upper part of the second-stage flash tank, and the lower part of the second-stage flash tank is connected with the upper part of the third-stage flash tank; preferably, the first-stage flash tank is connected with the water storage tank through a first-stage steam condensate conveying pipeline, and a group of control valves are arranged on the first-stage steam condensate conveying pipeline; the water storage tank and the second-stage flash tank are connected through a mixed condensate conveying pipeline, the two groups of mixed condensate conveying pipelines are respectively a first mixed condensate conveying pipeline and a second mixed condensate conveying pipeline, the first mixed condensate conveying pipeline is connected with the middle of the water storage tank and the upper part of the second-stage flash tank, the second mixed condensate conveying pipeline is connected with the bottom of the water storage tank and the upper part of the second-stage flash tank, and five groups of control valves are arranged on the two groups of furnace gas condensate conveying pipelines; the second-stage flash tank and the third-stage flash tank are connected through a second-stage steam condensate conveying pipeline, and four groups of control valves are arranged on the second-stage steam condensate conveying pipeline; preferably, the third-stage flash evaporator is connected with the boiler deaerator through a third-stage steam condensate conveying pipeline, the number of the third-stage steam condensate conveying pipelines is two, the two third-stage steam condensate conveying pipelines are an upper third-stage steam condensate conveying pipeline and a lower third-stage steam condensate conveying pipeline respectively, the upper third-stage steam condensate conveying pipeline is connected with the upper portion of the second-stage flash evaporator and the boiler deaerator, the lower third-stage steam condensate conveying pipeline is connected with the lower portion of the second-stage flash evaporator and the boiler deaerator, and five groups of control valves are arranged on the two third-stage steam condensate conveying pipelines; preferably, the tops of the first stage flash tank, the second stage flash tank and the third stage flash tank are respectively provided with a steam discharge port, and the first stage flash tank, the second stage flash tank and the third stage flash tank are respectively connected with a steam main pipeline; by the arrangement, full automation and pressure and liquid level automatic control of all levels of flash are realized.

In the application process of the embodiment, the first-stage steam condensate generated after the first-stage flash evaporator performs the first-stage flash evaporation is conveyed into the water storage tank through a first-stage steam condensate conveying pipeline, and the conveying amount is controlled through a group of control valves arranged on the first-stage steam condensate conveying pipeline; according to the liquid level in the water storage tank, five groups of control valves arranged on the two groups of furnace gas condensate conveying pipelines are used for controlling the mixed condensate in the water storage tank to be conveyed to a second-stage flash evaporator; the second-stage steam condensate generated after the second-stage flash evaporator carries out the second-stage flash evaporation is conveyed into the third-stage flash evaporator from the lower part of the second-stage flash evaporator through a second-stage steam condensate conveying pipeline, and the liquid level in the second-stage flash evaporator and the amount of condensate conveyed to the third-stage flash evaporator are controlled through four groups of control valves arranged on the second-stage steam condensate conveying pipeline; in the third-stage flash evaporator, the second-stage steam condensate is subjected to three-stage flash evaporation, the third-stage steam condensate generated after the three-stage flash evaporation is conveyed to the boiler deaerator through a third-stage steam condensate conveying pipeline for recycling, according to the liquid level in the third-stage flash tank, five groups of control valves arranged on the two groups of third-stage steam condensate conveying pipelines are used for controlling the liquid level in the third-stage flash tank and the amount of condensate conveyed to the boiler deaerator, when the liquid level in the third-stage flash tank is higher than the designated liquid level, the upper third-stage steam condensate conveying pipeline is opened, condensate is conveyed to the boiler deaerator through the upper third-stage steam condensate conveying pipeline, when the liquid level in the third-stage flash tank is lower than the designated liquid level, opening a lower third-stage steam condensate conveying pipeline, and conveying condensate to the boiler deaerator through the lower third-stage steam condensate conveying pipeline; therefore, according to the full-automatic operation of liquid level regulation and control, the overpressure of the condensate can be effectively avoided, and the safe and stable operation of the system is guaranteed.

The present invention is not limited to the above-described embodiments, and any obvious modifications or alterations to the above-described embodiments may be made by those skilled in the art without departing from the spirit of the present invention and the scope of the appended claims.