阅读说明：本技术 化工中引入光伏电能制取硫酸铵的方法 (Method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry ) 是由 林长贵 潘亚孟 于 2021-09-18 设计创作，主要内容包括：本发明公开了化工中引入光伏电能制取硫酸铵的方法,包括以下操作步骤：硫酸铵溶液通过进料泵经流量计进入预热器后,再进入一效加热器,在一效蒸发器内进行蒸发,蒸发出的二次蒸汽供二效加热器使用,由于真空作用,一效蒸发器蒸发过的溶液进入二效加热器再次加热并进入二效蒸发器进行蒸发,在二效蒸发过程中,在二效蒸发器下部加装一台强制循环泵,避免结晶的物料粘附到加热管的内壁上,达到一定浓度后的溶液进入三效蒸发器再次蒸发。本发明所述的化工中引入光伏电能制取硫酸铵的方法,通过太阳能发电的方式,对能源消耗少,将回收的二氧化硫、氨全部转化为化肥,不产生任何废水、废液和废渣,没有二次污染。(The invention discloses a method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering, which comprises the following operation steps: ammonium sulfate solution passes through the charge pump behind the entering preheater of flowmeter, reentrant one-effect heater, evaporate in one-effect evaporator, the secondary steam that evaporates supplies two-effect heater to use, because vacuum effect, the solution that one-effect evaporator evaporated gets into two-effect heater reheating and gets into two-effect evaporator and evaporates, at two-effect evaporation in-process, install a forced circulation pump additional in two-effect evaporator lower part, avoid on the material adhesion of crystallization to the inner wall of heating pipe, the solution after reaching certain concentration gets into three-effect evaporator and evaporates once more. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry has the advantages that the energy consumption is low by a solar power generation mode, the recovered sulfur dioxide and ammonia are completely converted into chemical fertilizers, no waste water, waste liquid and waste residue are generated, and no secondary pollution is caused.)

1. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry is characterized in that: the method comprises the following operation steps:

s1: the solar photovoltaic system comprises: the method comprises the steps of grouping solar photovoltaic power generation, selecting a grid-connected power generation mode, connecting the whole photovoltaic grid-connected power generation system to a 10KV alternating current power distribution system in a factory for grid-connected power generation by adopting a scheme of block power generation and centralized grid connection, adopting a 230Wp polycrystalline silicon solar cell module, adopting an integrated distributed photovoltaic polycrystalline silicon solar cell module of BIPV (building integrated photovoltaic) and a building on a building roof, selecting a solar photovoltaic grid-connected inverter, connecting an alternating current lightning protection power distribution cabinet, selecting an alternating current boosting transformer to form a solar photovoltaic system, and connecting the solar photovoltaic system to a power grid;

s2: solar power generation is combined with a preparation device: on the basis of power generation of a solar photovoltaic system, preparing ammonium sulfate by adopting triple-effect evaporation and concentration equipment;

s3: first-effect evaporation: the ammonium sulfate solution enters a preheater through a feed pump and a flowmeter, then enters a first-effect heater, is evaporated in a first-effect evaporator, and the evaporated secondary steam is used by a second-effect heater;

s4: two-effect evaporation: in the process of the two-effect evaporation, a forced circulation pump is additionally arranged at the lower part of the two-effect evaporator in consideration of the precipitation of partial crystals, so that the crystallized materials are prevented from being adhered to the inner wall of the heating pipe;

s5: triple-effect evaporation: the solution reaching a certain concentration enters a triple-effect evaporator to be evaporated again, the triple-effect evaporator is additionally provided with a circulating pump for the same reason, and the supersaturated material is crystallized at the lower part of the triple-effect evaporator;

s6: forming by ammonium sulfate: and after crystallization is finished, the ammonium sulfate crystal is separated in a centrifugal machine, the separated solution returns to an evaporator to be continuously evaporated and concentrated, the ammonium sulfate crystal is dried by air flow to meet the requirement of water content, and then is packaged by a packaging unit to obtain 50 kg of finished ammonium sulfate per bag, evaporated water and steam enter a liquid seal tank after passing through a preheater and a condenser, and are discharged by a water pump, and the preparation is finished.

2. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 1, which is characterized in that: in the step S1, each 1 megawatt power generation unit adopts 4 250KW grid-connected inverters, and the battery assemblies of each photovoltaic grid-connected power generation unit form a plurality of solar battery arrays in a series-parallel connection mode.

3. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 1, which is characterized in that: and in the step S1, the power grid design consists of 5 photovoltaic units of 4 megawatts, the total installation is 20 megawatts, the solar photovoltaic grid-connected power generation system is connected to a 10KV/50Hz medium-voltage alternating-current power grid, and the design is carried out according to the configuration of 1 set of 10KV/0.4KV voltage transformation and distribution system of the 2 megawatt grid-connected unit, namely the system needs to be configured with 10 sets of 10KV/0.4KV voltage transformation and distribution systems.

4. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 1, which is characterized in that: and the triple-effect evaporation and concentration equipment in the step S2 comprises a heater, an evaporator, a preheater, a feeding pump, a circulating discharge pump, a condenser, a liquid seal tank, a vacuum unit, process accessories, instruments, separation equipment and pneumatic drier equipment, wherein the separation equipment adopts a two-stage piston pushing type centrifugal machine.

5. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 4, which is characterized in that: the heater and the evaporator are divided into a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, and are made of 1Cr18Ni9Ti stainless steel materials.

6. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 4, which is characterized in that: the preheater is a shell-and-tube heating device, the specification of a heating tube is phi 38, the tube side and the tube plate of the preheater are made of 1Cr18Ni9Ti stainless steel materials, and the shell side is made of Q235B/6mm carbon steel materials.

7. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 4, which is characterized in that: the feeding pump is made of 1Cr18Ni9Ti stainless steel, the circulating pump and the circulating discharging pump are made of 1Cr18Ni9Ti stainless steel, and high-concentration materials or crystallized materials can be discharged continuously in a negative pressure state.

8. The method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical engineering according to claim 4, which is characterized in that: the condenser is made of Q235B carbon steel, the cooling area is 100 square meters, the liquid seal groove is made of carbon steel, the volume is 2000L, the water injection vacuum unit is adopted by the vacuum unit, and the process accessory pipeline is made of 1Cr18Ni9Ti/Q235 material.

Technical Field

The invention relates to the field of ammonium sulfate preparation, in particular to a method for preparing ammonium sulfate by introducing photovoltaic electric energy in chemical industry.

Background

The method for preparing the ammonium sulfate is a method for recycling and preparing the ammonium sulfate, sulfuric acid wastewater can be generated after flue gas desulfurization, an ammonium sulfate solution is evaporated and concentrated, the concentration of the ammonium sulfate is 18.0%, the treatment capacity per hour is 12 tons, the water volume required to be evaporated per hour is 9.6 tons, the ammonium sulfate is recycled, and along with the continuous development of science and technology, the manufacturing process requirements of people on the method for preparing the ammonium sulfate are higher and higher.

The existing method for preparing ammonium sulfate has certain disadvantages in use, firstly, when the method is used, the energy consumption is high, the ammonium sulfate solution is low in evaporation concentration efficiency and not beneficial to use of people, and in addition, the secondary pollution condition is easy to occur when the method is used for preparing ammonium sulfate, so that certain adverse effects are brought to the use process of people.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for preparing ammonium sulfate by introducing photovoltaic electric energy in chemical industry, which has the advantages of low energy consumption, conversion of all recovered sulfur dioxide and ammonia into chemical fertilizers in a solar power generation mode, no generation of any waste water, waste liquid and waste residue, no secondary pollution and capability of effectively solving the problems in the background art.

(II) technical scheme

In order to achieve the purpose, the invention adopts the technical scheme that: the method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry comprises the following operation steps:

s1: the solar photovoltaic system comprises: the method comprises the steps of grouping solar photovoltaic power generation, selecting a grid-connected power generation mode, connecting the whole photovoltaic grid-connected power generation system to a 10KV alternating current power distribution system in a factory for grid-connected power generation by adopting a scheme of block power generation and centralized grid connection, adopting a 230Wp polycrystalline silicon solar cell module, adopting an integrated distributed photovoltaic polycrystalline silicon solar cell module of BIPV (building integrated photovoltaic) and a building on a building roof, selecting a solar photovoltaic grid-connected inverter, connecting an alternating current lightning protection power distribution cabinet, selecting an alternating current boosting transformer to form a solar photovoltaic system, and connecting the solar photovoltaic system to a power grid;

s2: solar power generation is combined with a preparation device: on the basis of power generation of a solar photovoltaic system, preparing ammonium sulfate by adopting triple-effect evaporation and concentration equipment;

s3: first-effect evaporation: the ammonium sulfate solution enters a preheater through a feed pump and a flowmeter, then enters a first-effect heater, is evaporated in a first-effect evaporator, and the evaporated secondary steam is used by a second-effect heater;

s4: two-effect evaporation: in the process of the two-effect evaporation, a forced circulation pump is additionally arranged at the lower part of the two-effect evaporator in consideration of the precipitation of partial crystals, so that the crystallized materials are prevented from being adhered to the inner wall of the heating pipe;

s5: triple-effect evaporation: the solution reaching a certain concentration enters a triple-effect evaporator to be evaporated again, the triple-effect evaporator is additionally provided with a circulating pump for the same reason, and the supersaturated material is crystallized at the lower part of the triple-effect evaporator;

s6: forming by ammonium sulfate: and after crystallization is finished, the ammonium sulfate crystal is separated in a centrifugal machine, the separated solution returns to an evaporator to be continuously evaporated and concentrated, the ammonium sulfate crystal is dried by air flow to meet the requirement of water content, and then is packaged by a packaging unit to obtain 50 kg of finished ammonium sulfate per bag, evaporated water and steam enter a liquid seal tank after passing through a preheater and a condenser, and are discharged by a water pump, and the preparation is finished.

As a preferable technical solution of the present application, in the step S1, each 1 mw power generation unit adopts 4 250KW grid-connected inverters, and a battery module of each photovoltaic grid-connected power generation unit adopts a series-parallel connection mode to form a plurality of solar battery arrays.

As a preferred technical scheme of the present application, in the step S1, the power grid design is composed of 5 photovoltaic units of 4 mw, a total installation machine is 20 mw, the solar photovoltaic grid-connected power generation system is connected to a 10KV/50Hz medium voltage ac power grid, and a system is designed by configuring 1 set of 10KV/0.4KV transformation and distribution system according to a 2 mw grid-connected unit, that is, the system needs to configure 10 sets of 10KV/0.4KV transformation and distribution system.

As a preferred technical scheme of this application, triple effect evaporation concentration equipment includes heater, evaporimeter, pre-heater, charge pump, circulating pump, circulation bleeder pump, condenser, liquid seal groove, vacuum unit, technology accessory, instrument, splitter and air current desiccator equipment in S2 step, splitter adopts doublestage piston pushing type centrifuge.

As a preferred technical scheme, the heater and the evaporator are divided into a single-effect evaporator, a double-effect evaporator and a triple-effect evaporator, and 1Cr18Ni9Ti stainless steel material is adopted.

As a preferred technical scheme of the application, the preheater is tubular heating, the specification of a heating pipe is phi 38, the tube side and the tube plate of the preheater are made of 1Cr18Ni9Ti stainless steel materials, and the shell side is made of Q235B/6mm carbon steel materials.

As a preferred technical scheme in this application, the charge pump adopts 1Cr18Ni9Ti stainless steel material, circulating pump, circulation discharge pump adopt 1Cr18Ni9Ti stainless steel material, under negative pressure state, can make high concentration material or crystallization material continuous discharge work.

As a preferred technical scheme of this application, the condenser adopts Q235B carbon steel material, and the cooling area has 100 square meters, the liquid seal groove adopts carbon steel material, and the volume is 2000L, the water injection vacuum unit that the vacuum unit adopted, technology accessory pipeline adopts 1Cr18Ni9Ti/Q235 material.

(III) advantageous effects

Compared with the prior art, the invention provides a method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry, which has the following beneficial effects: the method for preparing ammonium sulfate by introducing photovoltaic electric energy in chemical industry has the advantages that energy consumption is low through a solar power generation mode, all recovered sulfur dioxide and ammonia are converted into chemical fertilizers, no waste water, waste liquid and waste residue are generated, no secondary pollution is caused, ammonium sulfate solution enters a preheater through a feed pump through a flowmeter and then enters a first-effect heater to be evaporated in a first-effect evaporator, evaporated secondary steam is used by a second-effect heater, the solution evaporated by the first-effect evaporator enters the second-effect heater to be reheated and enters the second-effect evaporator to be evaporated under the action of vacuum, partial crystal precipitation is considered in the process of the second-effect evaporation, a forced circulation pump is additionally arranged at the lower part of the second-effect evaporator, the crystallized materials are prevented from being adhered to the inner wall of a heating pipe, the solution reaching a certain concentration enters a third-effect evaporator to be evaporated again, the circulating pump is additionally arranged on the triple-effect evaporator for the same reason, the supersaturated materials are crystallized at the lower part of the triple-effect evaporator, the crystallized materials enter the centrifuge to separate ammonium sulfate crystals, the separated solution returns to the evaporator to be continuously evaporated and concentrated, the ammonium sulfate crystals are dried by airflow to meet the requirement of water content and then are packaged by the packaging unit to obtain 50 kg of finished ammonium sulfate per bag, evaporated water and steam enter the liquid seal tank after passing through the preheater and the condenser and are discharged by the water pump, the ammonium sulfate solution is evaporated and concentrated, the concentration of the ammonium sulfate is 18.0%, the treatment capacity per hour is 12 tons, the water amount evaporated per hour is 9.6 tons, 288 tons of sulfuric acid wastewater can be treated 24 hours a day, 57.6 tons of ammonium sulfate can be extracted, the economic benefit is high, the waste is changed into valuable, the harmful substances are turned into good, the value of the desulfurization byproducts is high, the resistance of the device is small, and the running power consumption is saved, the device and equipment occupy a small area, the old boiler is convenient to reform, the environmental protection requirement is met, the whole method for preparing ammonium sulfate is simple in structure and convenient to operate, and the using effect is better than that of the traditional method.

Detailed Description

The first embodiment is as follows:

the method for preparing ammonium sulfate by introducing photovoltaic electric energy into chemical industry comprises the following operation steps:

s1: the solar photovoltaic system comprises: the method comprises the steps of grouping solar photovoltaic power generation, selecting a grid-connected power generation mode, connecting the whole photovoltaic grid-connected power generation system to a 10KV alternating current power distribution system in a factory for grid-connected power generation by adopting a scheme of block power generation and centralized grid connection, adopting a 230Wp polycrystalline silicon solar cell module, adopting an integrated distributed photovoltaic polycrystalline silicon solar cell module of BIPV (building integrated photovoltaic) and a building on a building roof, selecting a solar photovoltaic grid-connected inverter, connecting an alternating current lightning protection power distribution cabinet, selecting an alternating current boosting transformer to form a solar photovoltaic system, and connecting the solar photovoltaic system to a power grid;

s2: solar power generation is combined with a preparation device: on the basis of power generation of a solar photovoltaic system, preparing ammonium sulfate by adopting triple-effect evaporation and concentration equipment;

s3: first-effect evaporation: the ammonium sulfate solution enters a preheater through a feed pump and a flowmeter, then enters a first-effect heater, is evaporated in a first-effect evaporator, and the evaporated secondary steam is used by a second-effect heater;

s4: two-effect evaporation: in the process of the two-effect evaporation, a forced circulation pump is additionally arranged at the lower part of the two-effect evaporator in consideration of the precipitation of partial crystals, so that the crystallized materials are prevented from being adhered to the inner wall of the heating pipe;

s5: triple-effect evaporation: the solution reaching a certain concentration enters a triple-effect evaporator to be evaporated again, the triple-effect evaporator is additionally provided with a circulating pump for the same reason, and the supersaturated material is crystallized at the lower part of the triple-effect evaporator;

s6: forming by ammonium sulfate: and after crystallization is finished, the ammonium sulfate crystal is separated in a centrifugal machine, the separated solution returns to an evaporator to be continuously evaporated and concentrated, the ammonium sulfate crystal is dried by air flow to meet the requirement of water content, and then is packaged by a packaging unit to obtain 50 kg of finished ammonium sulfate per bag, evaporated water and steam enter a liquid seal tank after passing through a preheater and a condenser, and are discharged by a water pump, and the preparation is finished.

Example two:

on the basis of the first embodiment, in the step S1, each 1 mw power generation unit adopts 4 250KW grid-connected inverters, and the battery modules of each photovoltaic grid-connected power generation unit form a plurality of solar battery arrays in a series-parallel connection manner.

The grid design in the step S1 consists of 5 photovoltaic units of 4 megawatts, the total installation is 20 megawatts, the solar photovoltaic grid-connected power generation system is connected to a 10KV/50Hz medium-voltage alternating-current grid, and the system is designed according to the configuration of 1 set of 10KV/0.4KV voltage transformation and distribution system of the 2 megawatt grid-connected unit, namely the system needs to be configured with 10 sets of 10KV/0.4KV voltage transformation and distribution systems.

Example three:

on the basis of the first embodiment and the second embodiment, the triple-effect evaporation and concentration equipment in the step S2 includes a heater, an evaporator, a preheater, a feed pump, a circulation discharge pump, a condenser, a liquid seal tank, a vacuum unit, process accessories, a meter, separation equipment and pneumatic dryer equipment, and the separation equipment adopts a two-stage piston pusher centrifuge.

The heater and the evaporator are divided into a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, and 1Cr18Ni9Ti stainless steel material is adopted.

The preheater is a shell-and-tube heating device, the specification of a heating tube is phi 38, the tube side and the tube plate of the preheater are made of 1Cr18Ni9Ti stainless steel materials, and the shell side is made of Q235B/6mm carbon steel materials.

The feeding pump is made of 1Cr18Ni9Ti stainless steel material, the circulating pump and the circulating discharging pump are made of 1Cr18Ni9Ti stainless steel material, and high-concentration materials or crystallized materials can be discharged continuously in a negative pressure state.

The condenser is made of Q235B carbon steel, the cooling area is 100 square meters, the liquid seal groove is made of carbon steel, the volume is 2000L, the water jet vacuum machine set is adopted by the vacuum machine set, and the process fitting pipeline is made of 1Cr18Ni9Ti/Q235 material.

The working principle is as follows: the method comprises the steps of grouping solar photovoltaic power generation, selecting a grid-connected power generation mode, adopting a scheme of block power generation and centralized grid connection for a solar photovoltaic grid-connected power generation system, realizing the grid-connected power generation of the whole photovoltaic grid-connected system by connecting a 10KV alternating current distribution system in a factory, adopting a 230Wp polycrystalline silicon solar cell module, adopting a BIPV and building integrated distributed photovoltaic polycrystalline silicon solar cell module for a building roof, selecting a solar photovoltaic grid-connected inverter, connecting an alternating current lightning protection power distribution cabinet, selecting an alternating current step-up transformer to form the solar photovoltaic system, connecting the solar photovoltaic system to a power grid, preparing ammonium sulfate by adopting triple-effect evaporation concentration equipment on the basis of the power generation of the solar photovoltaic system, feeding an ammonium sulfate solution into a preheater through a feeding pump and a flowmeter, then feeding the ammonium sulfate solution into a single-effect heater to be evaporated in the single-effect evaporator, and using evaporated secondary steam for a double-effect heater, because of the vacuum effect, the solution evaporated by the first-effect evaporator enters the second-effect heater to be heated again and enters the second-effect evaporator to be evaporated, in the process of the second-effect evaporation, partial crystal precipitation is considered, a forced circulation pump is additionally arranged at the lower part of the second-effect evaporator to prevent crystallized materials from being adhered to the inner wall of the heating pipe, the solution reaching a certain concentration enters the third-effect evaporator to be evaporated again, a circulation pump is additionally arranged on the third-effect evaporator for the same reason, the supersaturated materials are crystallized at the lower part of the third-effect evaporator, the crystallized materials enter a centrifugal machine to separate ammonium sulfate crystals after the crystallization is finished, the separated solution returns to the evaporator to be evaporated and concentrated continuously, the ammonium sulfate crystals are packaged by a packaging machine set after being dried by air flow to meet the requirement of water content, 50 kilograms of finished ammonium sulfate in each bag is obtained, and the evaporated water and steam enter a liquid seal tank after passing through a preheater and a condenser, then the mixture is discharged by a water pump, and the preparation is finished.

It is noted that, herein, relational terms such as first and second (a, b, etc.) and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.