CN213932103U

CN213932103U - Waste heat recovery system in methanol regeneration process

Info

Publication number: CN213932103U
Application number: CN202022675689.1U
Authority: CN
Inventors: 朱爱波; 郎连勇; 黄永刚
Original assignee: Hengli Petrochemical Dalian Refining Co Ltd
Current assignee: Hengli Petrochemical Dalian Refining Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-10
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a waste heat recovery system in methyl alcohol regeneration process belongs to chemical industry technical field. The waste heat recovery system in the methanol regeneration process comprises a methanol regeneration tower, a heat recoverer, an adjusting valve, a circulating water cooler and a methanol collecting tank, wherein high-temperature methanol steam generated by the methanol regeneration tower is output from the top of the tower, conveyed to the heat recoverer through a pipeline at the top of the tower to recover heat, then conveyed to the circulating water cooler to be condensed and liquefied, and finally flows into the methanol collecting tank. The utility model discloses simple structure, easy to maintain can retrieve the waste heat in the methyl alcohol steam, has avoided using a large amount of circulating water simultaneously, has reduced the cost of enterprise's production.

Description

Waste heat recovery system in methanol regeneration process

Technical Field

The utility model relates to a chemical industry technical field, concretely relates to waste heat recovery system in methyl alcohol regeneration process.

Background

Methanol is saturated monohydric alcohol with the simplest structure, has a molecular weight of 32.04 and a boiling point of 64.7 ℃, and is also called as "xylitol" or "wood essence" because of being found in dry distillation wood for the first time. Methanol is colorless, volatile, easy and toxic, is generally used as a solvent, an antifrost agent, a fuel or a neutralizing agent, is widely applied to the production of medicines, pesticides, dyes, coatings, plastics, synthetic fibers, synthetic rubber and the like, and is also used as a solvent, industrial and civil fuels and the like.

The application range of methanol is wide, the demand is large, and the recovery of methanol is particularly important for avoiding environmental pollution and energy waste. In order to save energy, improve energy utilization efficiency and reduce the cost of circulating water, a heat recovery device of a methanol regeneration system is urgently needed.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a waste heat recovery system among methyl alcohol regeneration process increases a set of heat recoverer through the methyl alcohol steam condensation anterior segment at methyl alcohol regeneration system, retrieves the energy in the methyl alcohol steam to the energy saving has reduced the consumption of condensation circulating water.

The utility model discloses technical scheme as follows:

the utility model provides a waste heat recovery system in methyl alcohol regeneration process, include: the system comprises a methanol regeneration tower, a heat recoverer, a regulating valve, a circulating water cooler and a methanol collecting tank;

the methanol vapor outlet at the top of the methanol regeneration tower is connected with the inlet of a heat recoverer through a pipeline, two ends of the heat recoverer are connected in parallel with an adjusting valve, the outlet of the heat recoverer is connected with the inlet of a circulating water cooler through a pipeline, and the outlet of the circulating water cooler is connected with a methanol collecting tank through a pipeline.

Preferably, the heat recoverer is a heat exchanger or a plurality of heat exchangers connected in series.

Preferably, the heat exchanger is a shell-and-tube heat exchanger, a plate heat exchanger or a coil heat exchanger.

Preferably, the heat exchanger is BEM type, that is, the front end channel box is B type standard elliptical head channel box, the shell is a one-way shell, and the rear end channel box is M type channel box with a conical head.

Preferably, a check valve is connected in series at the inlet or the outlet of the heat exchanger.

Preferably, the heat exchange working medium of the heat exchanger is warm water, methanol, acetone or a mixed solution of two or more than two.

Preferably, the heat exchanger is connected with a coiled pipe of the methanol regeneration tower to provide heat tracing for the methanol regeneration tower.

Preferably, the heat exchanger is connected with a fan heater or a heater to supply heat for other rooms.

Compared with the prior art, the utility model discloses gain following beneficial effect:

1) the utility model discloses simple structure, easy to maintain can retrieve the heat in the methyl alcohol steam, has avoided the condensation process to use a large amount of circulating water, has reduced the cost of production.

2) The waste heat recovered by the heat recoverer can be merged into a pipe network or used for heating, so that energy is saved, the energy utilization efficiency is improved, and economic benefits are created for companies.

Drawings

Fig. 1 is a process flow of the heat recovery device of the methanol regeneration system of the present invention.

Detailed Description

The utility model provides a methanol regeneration system heat reclamation device, as shown in figure 1, include: the system comprises a methanol regeneration tower, a warm water heat exchanger, a regulating valve, a circulating water cooler, a methanol collecting tank and the like.

The work flow of the system is as follows:

high-temperature methanol steam generated by the methanol regeneration tower is output from the top of the tower, is subjected to heat recovery by a warm water heat exchanger, is conveyed to a circulating water cooler for further condensation and liquefaction, and flows into a methanol collecting tank after liquid is formed.

The warm water heat exchanger is a BEM type heat exchanger, namely the front end channel box is a B type standard elliptical seal head channel box, the shell is a one-way shell, and the rear end channel box is an M type channel box with a conical seal head. High-temperature methanol steam is input through an inlet at the upper end of a tube pass of the heat exchanger, and the cooled methanol steam is output from an outlet at the lower end of the tube pass; the low-temperature heat exchange working medium is input through an inlet at the lower end of the shell pass of the heat exchanger, and the heat exchange working medium after temperature rise is output from an outlet at the upper end of the shell pass.

Two ends of the warm water heat exchanger are connected with the regulating valve in parallel, the flow of the methanol steam passing through the heat recoverer is regulated and controlled, and the system is kept to operate stably.

The circulating water cooler is a shell-and-tube heat exchanger, cooling water is input through an inlet at the lower end of a shell pass of the heat exchanger, and the heated cooling water is output from an outlet at the upper end of the shell pass.

The methanol collecting tank is used for collecting the condensed and liquefied methanol solution.

The data pairs before and after optimization of the heat recovery unit of the methanol regeneration system are shown in table 1 below.

TABLE 1 comparison of data before and after optimization of methanol regeneration System

Example 1

The utility model adopts the device shown in figure 1, and the technological parameters are shown in table 2;

the heat exchanger is in a form that: BEM type heat exchanger, heat transfer area: 730m²。

TABLE 2 Process parameters of the heat recovery unit of the methanol regeneration system

The existing 3 methanol regeneration towers in our workshop, totally 3 heat recoverer devices:

the heat quantity recovered by 3 heat recoverers per hour is as follows: 1188.4kJ/(h. table). times.3 tables 3565.2kJ/h

The heat recovered by 3 heat recoverers every year is as follows: 3565.2 kJ/hX8400 h-29947680 kJ

The consumption of the condensed water per hour of 3 circulating water coolers is as follows: 31832.5kg/(h. table). times.3 tables 95497.5kg/h

The annual condensed water consumption of 3 circulating water coolers is as follows: 95497.5kg/h × 8400h 802179000kg (802179t)

Comparative example 1

The comparative example did not use a recuperator, was otherwise the same as the apparatus shown in FIG. 1, and had the process parameters shown in Table 3;

TABLE 3 Process parameters relating to comparative examples

Calculating according to 3 circulating water cooler devices:

the consumption of the condensed water per hour of 3 circulating water coolers is as follows: 60128.1kg/(h. table). times.3 tables 180384.3kg/h

The annual condensed water consumption of 3 circulating water coolers is as follows: 180384.3kg/h × 8400h 1515228120kg (1515228.1t)

Therefore, adopt the utility model discloses a behind the heat recoverer, the energy saving 29947680kJ practices thrift comdenstion water quantity 713049.1t annually, the utility model discloses a heat recoverer has avoided the condensing process to use a large amount of comdenstion water, has reduced the cost of production, has retrieved the waste heat in the methyl alcohol steam, and the energy saving has created economic benefits again for the company.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.

Claims

1. The waste heat recovery system in the methanol regeneration process is characterized by comprising a methanol regeneration tower, a heat recoverer, an adjusting valve, a circulating water cooler and a methanol collecting tank, wherein a methanol steam outlet at the top of the methanol regeneration tower is connected with an inlet of the heat recoverer through a pipeline, two ends of the heat recoverer are connected with the adjusting valve in parallel, an outlet of the heat recoverer is connected with an inlet of the circulating water cooler through a pipeline, and an outlet of the circulating water cooler is connected with the methanol collecting tank through a pipeline.

2. A waste heat recovery system as claimed in claim 1, wherein the recuperator is a heat exchanger or a plurality of heat exchangers in series.

3. The waste heat recovery system of claim 2, wherein the heat exchanger is a shell and tube heat exchanger, a plate heat exchanger, or a serpentine heat exchanger.

4. The waste heat recovery system of claim 3, wherein the heat exchanger is BEM-type, i.e., the front end channel is a B-type standard oval head channel, the shell is a one-way shell, and the rear end channel is an M-type channel with a conical head.

5. A waste heat recovery system according to any one of claims 2-4, characterized in that a check valve is connected in series at the inlet or outlet of the heat exchanger.

6. The waste heat recovery system of claim 5, wherein the heat exchange working medium of the heat exchanger is warm water, methanol, acetone or a mixture of two or more.

7. The waste heat recovery system of claim 6, wherein the temperature at the inlet of the shell side of the heat exchanger is 65-75 ℃ and the temperature at the outlet of the heat exchanger is 80-85 ℃.

8. The heat recovery system of claim 7, wherein the heat exchanger is connected to a serpentine of the methanol regeneration column to provide heat tracing to the methanol regeneration column.

9. The heat recovery system of claim 7, wherein the heat exchanger is connected to a fan heater or a heater for heating.