CN210568331U - System for utilizing high-pressure saturated steam - Google Patents
System for utilizing high-pressure saturated steam Download PDFInfo
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- CN210568331U CN210568331U CN201921093585.0U CN201921093585U CN210568331U CN 210568331 U CN210568331 U CN 210568331U CN 201921093585 U CN201921093585 U CN 201921093585U CN 210568331 U CN210568331 U CN 210568331U
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Abstract
The utility model discloses a system for utilizing high-pressure saturated steam in the production process of coal-to-ethylene glycol, which comprises a superheater system, a power generation system and a waste heat boiler system which are sequentially connected, wherein the superheater system is respectively connected with the power generation system and the waste heat boiler system; the superheater system comprises an incinerator and a superheater which are sequentially connected, wherein natural gas, waste gas and waste liquid are all connected with an incinerator inlet, high-pressure saturated steam, desuperheating water and an incinerator outlet are connected with the superheater inlet, and the superheater outlet is connected with a waste heat boiler system and a power generation system; the inlet of the waste heat boiler is connected with the flue gas and saturated boiler water after primary heat recovery, the outlet of the waste heat boiler is connected with the inlet of medium-pressure saturated steam and an air preheater, and the outlet of the air waste heat boiler is connected with the flue gas after secondary heat recovery; the system realizes the harmless treatment of the waste gas and waste liquid in the production process of the coal-to-ethylene glycol, and simultaneously, the high-pressure saturated steam is superheated for power generation through the recovery of latent heat in the waste gas, so that the energy utilization rate is greatly improved.
Description
Technical Field
The utility model relates to an equipment of chemical industry technical field saturated steam, especially the utilization system of a high pressure saturated steam in coal chemical industry field.
Background
The economy of China is rapidly increased, each construction is greatly achieved, and meanwhile, the resources and the environment are damaged. Along with the trend of energy conservation and emission reduction of enterprises and the trend of transformation and upgrading of industries, the recycling level of waste heat and residual energy resources of chemical enterprises is greatly improved, the optimization of an energy structure and the development of high-quality and low-quality energy utilization technologies are emphasized, the technological process optimization and the efficient utilization of process energy are emphasized, and a larger gap is left compared with the international level.
The high-pressure superheated steam power generation system fully utilizes the waste heat of the process, does not need to input extra fuel, and accords with the environmental protection policy of national resources conservation and environmental protection. In the chemical production of ethylene glycol from coal, a large amount of high-pressure saturated steam is generated, and the high-pressure saturated steam is not widely used for generating electricity in chemical plants. Saturated steam expands behind the work increase of steam humidity and causes the header pipe network to take water easily, can lead to header pipe network and steam turbine to take place the liquid hammer phenomenon, influences the effect of steam turbine, shortens the life of blade, and for solving above-mentioned problem, saturated steam need be through the available electricity generation in overheat treatment rear.
The high-pressure saturated steam power generation technology is used for recycling surplus high-pressure saturated steam to carry out waste heat power generation, and often, due to the fact that the design is unreasonable, the auxiliary system is not coordinated in matching, the working efficiency is reduced, and waste heat generated by the process cannot be recycled to the maximum through heat.
Disclosure of Invention
The utility model aims at solving a large amount of high pressure saturated steam in coal system ethylene glycol chemical production for in the power generation process, the steam turbine takes place the liquid and hits the phenomenon, shortens the life's of blade problem, provides a high pressure saturated steam's utilization system, and a large amount of high pressure saturated steam that make full use of coal system ethylene glycol in-process produced practices thrift the energy, reduce cost.
In order to solve the technical problem, the utility model provides a technical scheme is:
a high-pressure saturated steam utilization system comprises a superheater system, a power generation system and a waste heat boiler system which are sequentially connected through pipelines, wherein the superheater system is respectively connected with the power generation system and the waste heat boiler system; the superheater system comprises an incinerator and a superheater which are connected in sequence, natural gas, waste gas and waste liquid all enter the incinerator, high-pressure saturated steam, desuperheating water and an incinerator outlet are connected with a superheater inlet, and a superheater outlet is connected with a waste heat boiler system and a power generation system; the power generation system comprises a steam turbine and a generator which are connected in sequence; the waste heat boiler system comprises a waste heat boiler and an air preheater which are sequentially connected, wherein the inlet of the waste heat boiler is connected with a water pipeline of a saturated boiler and the outlet of a superheater, the outlet of the waste heat boiler is connected with the inlet of the air preheater and a medium-pressure steam pipe network, and the outlet of the air preheater is connected with a denitration working section.
A waste liquid atomizer is connected in front of the incinerator; in order to ensure that the waste liquid can be fully mixed with the waste gas and the natural gas and can be combusted more completely, the methyl formate waste liquid from the DMC recovery working section adopts a special waste liquid spray gun, is atomized by adopting compressed air, is mixed with tail gas of a DMO device and methanol rectification non-condensable gas, tail gas and natural gas, and enters an incinerator together for combustion.
The incinerator and the superheater are sequentially connected, high-temperature flue gas generated by combustion enters the superheater from the front end to serve as a heat source for heating high-pressure saturated steam, and the high-pressure saturated steam enters the superheater from the tail end to carry out countercurrent heat transfer with the high-temperature flue gas, so that the high-pressure saturated steam is heated to high-pressure superheated steam.
The outlet of the superheater is connected with a power generation system, high-pressure superheated steam at the outlet of the front end of the superheater is sequentially connected with a steam turbine, and the steam turbine is in transmission connection with a generator, wherein a 20MW back-extraction steam turbine is adopted, and 3.5-4MPa saturated steam is extracted and merged into a medium-pressure steam pipe network during power generation.
The outlet of the superheater is connected with the waste heat boiler system to carry out secondary heat recovery. The flue gas after primary heat recovery at the tail end outlet of the superheater is sequentially connected with a waste heat boiler, and when the waste heat boiler steam drum recovers heat, medium-pressure saturated steam is byproduct and is merged into a medium-pressure steam pipe network.
The waste heat boiler is connected with the inlet of the air preheater in sequence, the flue gas after heat exchange is connected with the inlet of the denitration working section, and NO is controlledXNot more than 50 mg/L.
The waste heat boiler system is also connected with a waste heat boiler drum water replenishing pipeline; an independent waste heat boiler drum water replenishing pipeline is arranged for ensuring the equipment safety, and saturated boiler water with the pressure of 10-13MPa and the temperature of 120-140 ℃ is used as drum water replenishing.
In order to ensure the safety of equipment, the temperature of the high-pressure superheated steam discharged out of the superheating furnace is controlled not to exceed 540 ℃, the tail end of the superheating furnace is connected with a temperature-reducing water inlet and reversely contacts with the high-temperature superheated steam at the front end, heat exchange is carried out, and normal-temperature primary water from a park is used as the temperature-reducing water.
The utility model has the advantages that:
the utility model provides a system for utilizing high-pressure saturated steam has realized the comprehensive utilization of steam, carries out most recovery with the sensible heat of surplus high-pressure saturated steam, still by-product high-quality steam when improving recovery heat efficiency by a wide margin, realizes that waste gas waste liquid innocent treatment, is showing and is improving energy utilization; the low-cost electric power is obtained, the contradiction between supply and demand of enterprise electricity utilization is relieved, the production energy consumption is reduced, a large amount of working medium loss is saved, and the water consumption index is reduced. The problems of gasification heat energy recovery and comprehensive treatment and recycling of waste gas and waste liquid in the process of preparing ethylene glycol from coal are solved, and the production cost of ethylene glycol is reduced.
Drawings
FIG. 1 is a schematic diagram of the system connection of the present invention;
Detailed Description
The present invention is further illustrated by the following examples, but it should be understood that the specific examples described herein are merely illustrative of one embodiment and that other embodiments based on the concepts and principles of the invention are within the scope of the invention.
Referring to the attached figure 1 of the specification, a high-pressure saturated steam utilization system comprises the following systems which are connected through pipelines: the superheater system 1, the power generation system 3 and the waste heat boiler system 2 are sequentially connected, and the superheater system 1 is respectively connected with the power generation system 3 and the waste heat boiler system 2; the superheater system comprises an incinerator 4 and a superheater 5 which are sequentially connected, natural gas 10, waste gas 11 and waste liquid 12 are all connected with an inlet of the incinerator 4, high-pressure saturated steam 13, desuperheating water 14 and an outlet of the incinerator 4 are connected with an inlet of the superheater 5, and an outlet of the superheater 5 is connected with a waste heat boiler system 2 and a power generation system 3; the power generation system 3 comprises a steam turbine 8 and a generator 9 which are connected in sequence; the waste heat boiler system 2 comprises a waste heat boiler 6 and an air preheater 7, wherein an inlet of the waste heat boiler 6 is connected with flue gas 16 and saturated boiler water 18 after primary heat recovery, an outlet of the waste heat boiler 6 is connected with medium-pressure saturated steam 19 and an inlet of the air preheater 7, and an outlet of the air preheater 7 is connected with flue gas 17 after secondary heat recovery and enters a denitration section 20.
The methyl formate waste liquid 12 from the DMC recovery section with the pressure of 0.4MPa and the temperature of 40 ℃ is atomized by compressed air by adopting a special waste liquid spray gun, and is fully mixed with the waste gas 11 which is composed of DMO tail gas from the ethylene glycol section with the pressure of 0.24MPa and the temperature of-7.1 ℃, the pressure of the recovered gas section with the pressure of 0.015MPa, the stripping gas at the temperature of 35 ℃ and methanol rectified noncondensable gas at the temperature of 40 ℃ and the natural gas 10, and the mixture is fed into the incinerator 4 to be combusted.
The incinerator 4 is connected with the superheater 5 in sequence, heat exchange is carried out in the incinerator 4, high-temperature flue gas at 1100 ℃ generated by combustion enters from the front end of the superheater 5 and is used as a heat source of high-pressure saturated steam with the heating pressure of 9.8MPa and the temperature of 310 ℃, high-pressure saturated steam 13 enters from the tail end of the superheater 5 and is in countercurrent heat transfer with the heat source, and the high-pressure saturated steam 13 is heated to high-pressure superheated steam 15 with the pressure of 9.8MPa and the temperature of 540 ℃. Wherein, the incinerator 4 adopts micro negative pressure operation, the superheater 5 adopts high temperature resistant 12Cr1MoVG material, and the pressure is 10.8 MPa.
Foretell superheat furnace goes out 5 mouths and the hookup of power generation system 3, among the power generation system 3 steam turbine 8 and generator 9 hookup in proper order, go out the high-pressure superheated steam 15 of hot stove 5 and get into steam turbine 8, steam turbine 8 drive generator 9 is rotatory, and steam turbine 8 selects to adopt 20MW to take out back of the body formula steam turbine, and generator 9 selects for use 10MW generator, annual power generation: 14400 ten thousand MW for the whole plant; when the high-pressure superheated steam 15 is used for generating electricity, the steam turbine 8 can pump medium-pressure saturated steam 19 with the pressure of 3.8MPa and the temperature of 420 ℃ into a medium-pressure steam pipe network 21.
The outlet of the superheater 5 is connected with a waste heat boiler system for heat exchange. The flue gas 16 after primary heat recovery at the outlet of the tail end of the superheater 5 is connected with the waste heat boiler 6 in sequence, the pressure of the flue gas is 10.8MPa, the temperature is about 900 ℃, and when the waste heat boiler 6 exchanges heat, the byproduct of medium-pressure saturated steam 19 with the pressure of 3.8MPa and the temperature of 250 ℃ is merged into a medium-pressure steam pipe network 21.
The waste heat boiler 6 is connected with the inlet of the air preheater 7 in sequence, the smoke at the outlet of the waste heat boiler 6 exchanges heat with the air from the tail end of the air preheater 7,after heat exchange, the temperature of hot air is about 200 ℃; the flue gas 17 after secondary heat recovery is connected with the inlet of the denitration working section 20 to control the outlet area to purify NO in the flue gasXNot more than 50 mg/L.
The waste heat boiler 6 is connected with a waste heat boiler drum water replenishing pipeline 22, in order to ensure the safety of equipment, the waste heat boiler 6 is provided with the independent waste heat boiler drum water replenishing pipeline 22, saturated boiler water 18 with the pressure of 11.5MPa and the temperature of 110 ℃ is used as the water replenishing of the waste heat boiler drum 6, and the steam-water balance in the waste heat boiler 6 is kept.
The superheater 5 is connected with a water supply pipeline of the desuperheating water 14, the temperature of the heated high-pressure superheated steam 15 is 450-550 ℃, in order to ensure the safety of equipment, primary water is used as the desuperheating water 14 to exchange heat with the high-pressure superheated steam 15, and the temperature of the high-pressure superheated steam 15 at the outlet of the superheater 5 is controlled to be not less than 540 ℃.
The above-mentioned embodiments should not be considered as limitations of the present invention, and for those skilled in the art, many alterations, modifications, improvements, etc. may be made without departing from the spirit and scope of the present invention, and any modification, equivalent alterations, improvements, etc. made should be included in the scope of the present invention.
Claims (4)
1. A utilization system of high-pressure saturated steam is characterized in that: the system comprises a superheater system, a power generation system and a waste heat boiler system which are sequentially connected through pipelines, wherein the superheater system is respectively connected with the power generation system and the waste heat boiler system; the superheater system comprises an incinerator and a superheater which are connected in sequence, natural gas, waste gas and waste liquid all enter the incinerator, high-pressure saturated steam, desuperheating water and an incinerator outlet are connected with a superheater inlet, and a superheater outlet is connected with a waste heat boiler system and a power generation system; the power generation system comprises a steam turbine and a generator which are connected in sequence; the waste heat boiler system comprises a waste heat boiler and an air preheater which are sequentially connected, wherein the inlet of the waste heat boiler is connected with a water pipeline of a saturated boiler and the outlet of a superheater, the outlet of the waste heat boiler is connected with the inlet of the air preheater and a medium-pressure steam pipe network, and the outlet of the air preheater is connected with a denitration working section.
2. The system for utilizing high pressure saturated steam as claimed in claim 1, wherein said incinerator is further coupled with a waste liquid atomizer.
3. The system for utilizing high pressure saturated steam according to claim 1, wherein the steam turbine is a back extraction steam turbine.
4. The system for utilizing high pressure saturated steam of claim 1, wherein the waste heat boiler system is further coupled to a waste heat boiler drum makeup line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921093585.0U CN210568331U (en) | 2019-07-12 | 2019-07-12 | System for utilizing high-pressure saturated steam |
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| CN201921093585.0U CN210568331U (en) | 2019-07-12 | 2019-07-12 | System for utilizing high-pressure saturated steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735065A (en) * | 2020-06-23 | 2020-10-02 | 山东同智创新能源科技股份有限公司 | Comprehensive treatment system for realizing ultra-clean emission of waste gas liquid resource in coal-to-ethylene glycol process |
| CN111750340A (en) * | 2020-06-16 | 2020-10-09 | 山东同智创新能源科技股份有限公司 | Flue gas waste heat step recovery system and method thereof |
-
2019
- 2019-07-12 CN CN201921093585.0U patent/CN210568331U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750340A (en) * | 2020-06-16 | 2020-10-09 | 山东同智创新能源科技股份有限公司 | Flue gas waste heat step recovery system and method thereof |
| CN111735065A (en) * | 2020-06-23 | 2020-10-02 | 山东同智创新能源科技股份有限公司 | Comprehensive treatment system for realizing ultra-clean emission of waste gas liquid resource in coal-to-ethylene glycol process |
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