(1) Since $a_{n+1}+1= \frac{(2e^{n+1}-2)(a_{n}+1)}{a_{n}+1+2e^{n}-2}$,
it follows that $\frac{2(e^{n+1}-1)}{a_{n+1}+1}=\frac{a_{n}+1+2(e^{n}-1)}{a_{n}+1}=1+\frac{2(e^{n}-1)}{a_{n}+1}$,
which implies that $\frac{e^{n+1}-1}{a_{n+1}+1}-\frac{e^{n}-1}{a_{n}+1}=\frac{1}{2}$.
Thus, the sequence $\{\frac{e^{n}-1}{a_{n}+1}\}$ is an arithmetic sequence with a common difference of $\frac{1}{2}$.

(2) From (1), we know that $\frac{e^{n}-1}{a_{n}+1}=\frac{e-1}{a_{1}+1}+\frac{1}{2}(n-1)=\frac{n}{2}$,
which implies that $a_{n}=\frac{2(e^{n}-1)}{n}-1$. Let $f(x)=\frac{2(e^{x}-1)}{x}-1 (x\geqslant 1)$,
then $f'(x)=\frac{2(e^{x}\cdot x-e^{x}+1)}{x^{2}}$. Obviously, $f'(x)>0$ holds for all $x\in[1,+\infty)$.
Therefore, $f(x)=\frac{2(e^{x}-1)}{x}-1$ is strictly increasing on $[1,+\infty)$.
Hence, the sequence $\{a_{n}\}$ is strictly increasing.

(3) From the problem, we know that $a_{1}=2e-3$.
Since $a_{n}\geqslant a_{1}>1$, it follows that $\frac{1}{a_{n}}<\frac{2}{a_{n}+1}$, i.e., $\frac{1}{a_{1}}+\frac{1}{a_{2}}+…+\frac{1}{a_{n}}<\frac{2}{a_{1}+1}+\frac{2}{a_{2}+1}+…+\frac{2}{a_{n}+1}$.
Moreover, since $\frac{2}{a_{n}+1}=\frac{n}{e^{n}-1}<\frac{n}{e^{n-1}}$,
we have $\frac{2}{a_{1}+1}+\frac{2}{a_{2}+1}+…+\frac{2}{a_{n}+1}<1+2\cdot\frac{1}{e}+3\cdot\frac{1}{e^{2}}+…+n\cdot\frac{1}{e^{n-1}}$.
Let $S_{n}=1+2\cdot\frac{1}{e}+3\cdot\frac{1}{e^{2}}+…+n\cdot\frac{1}{e^{n-1}}$,
then $\frac{1}{e}S_{n}=1\cdot\frac{1}{e}+2\cdot\frac{1}{e^{2}}+…+n\cdot\frac{1}{e^{n}}$.
Subtracting the two equations, we obtain $(1-\frac{1}{e})S_{n}=1+\frac{1}{e}+\frac{1}{e^{2}}+…+\frac{1}{e^{n-1}}-n\cdot\frac{1}{e^{n}}=\frac{e}{e-1}(1-\frac{1}{e^{n}})-n\cdot\frac{1}{e^{n}}<\frac{e}{e-1}$.
Thus, $S_{n}<(\frac{e}{e-1})^{2}$,
which implies that $\frac{2}{a_{1}+1}+\frac{2}{a_{2}+1}+…+\frac{2}{a_{n}+1}<1+2\cdot\frac{1}{e}+3\cdot\frac{1}{e^{2}}+…+n\cdot\frac{1}{e^{n-1}}<(\frac{e}{e-1})^{2}$.
Therefore, $\boxed{\frac{1}{a_{1}}+\frac{1}{a_{2}}+…+\frac{1}{a_{n}}<(\frac{e}{e-1})^{2}}$.